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Thread: PAIR block off to reduce backfire/popping

Created on: 11/19/09 10:37 PM

Replies: 16

Rook


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Joined: 03/28/09

Posts: 19462

PAIR block off to reduce backfire/popping
11/19/09 10:37 PM

Gen1 PAIR block off to Reduce Backfiring/Popping

The PAIR system sucks cool fresh air from the air box and releases it into the exhaust. The higher level of oxygen in the exhaust reacts more readily with the catalytic converters and produces cleaner emissions. When switching to slip-ons or a full system, some or all of the catalytic converters are removed and the additional air in the exhaust seems to make unburned fuel that is expelled in the exhaust ignite much easier and we get some popping on deceleration.

This is the simplest method to disable the PAIR system if you find the popping noise bothersome. It should also prove valuable if you are data logging or tuning because your o2 sensor will not give false readings based on exhaust that is mixed with fresh air from the PAIR system. There are a couple more elaborate methods (which are no more effective) that involve removing the PAIR system and blocking the passages that are left (see PAIR Removal-Block-Off Plates Install). I chose this method because I wanted to test how well it works before doing something more elaborate.

Do First:
Remove from RH side of bike: ram air tube cover, forman, tank cover, lower faring and side fairing (see Fairing Removal).

You will need:
one 5/8” diameter wooden dowel
one #8 hose clamp
sand paper, coarse and fine grit
pencil
saw
screwdriver
silicone lubricant

1. Locate the grey clear air hose which is inserted into the bottom of the air box. The hose is marked with a piece of blue tape in the photo below.

Simply pull the hose out of the grommet under the air box that the hose is inserted through.


2. Insert 5/8” diameter wooden dowel into the hose. It will fit very tight. I thought it best to reduce the diameter of the dowel to avoid stretching the hose or distorting the rubber fitting that the hose fits into when the hose is reinserted into the air box. A tighter fit should be safer and seal better but it may also stretch, making restoring back to OEM difficult if the rubber parts no longer fit.

I sanded the dowel down so that it was closer to 9/16” and tapered a bit toward the tip so that it could be pushed into the hose (or removed) easier. I also rounded one side of the tip so that it would fit into the bend in the hose smoothly. I used a fine grit sand paper to remove any wood fibers that could come off of the dowel when installed into the hose.

When the dowel is shaped to make a good, tight fit without distorting the shape of the hose too much, draw a line around the top of the hose to mark where the dowel should be sawed off.


3. Sand the top of the dowel with fine sandpaper to remove any wood fibers that could enter the air box.


4. Press the dowel into the hose.

Tighten a #8 hose clamp against the clean air hose where the dowel is inserted at a point just above the bend in the hose.

If anything, the PAIR system will tend to suck the dowel down the hose so there is little danger of the dowel coming out and falling into the air box as long as the dowel fits in the hose tightly. I do not know if a strong backfire in the exhaust or detonation in the engine could cause the dowel to eject into the air box but if it could, the hose clamp is an added measure of protection.


5. Apply a film of silicone or spit (your preference) to the clean air hose and reinsert it into the grommet in the air box.

No air can enter the PAIR system. Backfire/popping should be reduced to a minimum and exhaust sampling accuracy should be improved.


* Last updated by: Rook on 9/5/2017 @ 4:05 PM *



'08 MIDNIGHT SAPPHIRE BLUE flies out, full Tsukigi Cannon exhaust, BMC race filter, Muzzy's block off plates, Super Sprox 17t output sprocket, AFM 45t rear sprocket, EK zzz 530 chain, Gilles Tooling axle adjusters, PC5, Romans map, AT-200, Ignition Module, LCD-200, Speedohealer V4, Glow-Shift gauges, Illumiglow 210 mph clock faces, HM PLUS quickshifter, Factory Pro EVO Shift Star, RC's oil pump cover, Moto-D magnetic oil drain plug, MIT billet oil filler cap, Shorai 14A2 Lithium battery, Spiegler SS clutch and brake lines, HyperPro RSC steering damper, LighTech fuel tank cap, Vortex rearsets, lightweight mudflap bracket, FP Racing preload adjusters, Ohlins FGRT807 forks and KA544 shock, Carrazzeria Tri-R wheels, Bridgeport 90° valve stems, CZ 320mm front rotors, Galfer rear wave rotor, Pazzo levers, ProBots Dzus fasteners and many other bolts replaced with aluminum or Ti, Vortex mirror blocks, CRG bar end mirrors, LSL frame sliders, axle sliders, billet bar ends, 2WheelWorkz muffler

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scottjkyl


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Location: east jordan,mi

Joined: 06/26/09

Posts: 1851

RE: PAIR block off to reduce backfire/popping
11/20/09 8:41 AM

nice demonstration rook so hows it work? think its time to put the beast to sleep for the winter. sounds like a good mod for a winter project. rook with the fresh air blocked off will it make the bike run richer?



08 zx14se Brocks CT Duals, Brocks street map, Driven 16/43 sprockets,EK ZZZ Chain,MRA Windscreen, Roaring Toyz Diamond Cut Grips Pingel Elec shifter, Hyper-Pro RSC Damper, BlackChrome Wheels, Sargent Seat,Factory Pro Velocity Stacks,PCIII USB,Bonneville Pro, TPX Radar/Laser Detector, TPX Laser Jammer, Goodridge Shadow series braided lines front and rear, Rifleman 1/5 turn throttle, Fusion LED Stage IV Kit, DDM HID's 10,000k

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Rook


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Joined: 03/28/09

Posts: 19462

RE: PAIR block off to reduce backfire/popping
11/20/09 7:38 PM

I'm sure not the expert, Scott but as far as i know, eliminating the PAIR would have no effect on a/f mixtures. The clean air goes straight into the exhaust and never touches the fuel spray. I am curious as to whether the clean air goes in through the exhaust valves or if it goes straight to the exhaust outlets. I'm pretty sure it goes to the valves. The airbox pressure will be increased with the PAIR blocked so perhaps that would cause it to run a bit leaner.

How does it work? -----welllllllll-- it's an improvement with the Cannon but I don't think there is anything that will shut that pipe up completely. I'd say between running 93 octane and doing the PAIR block off, the popping is reduced by about 35%. If I rev above 5000, it will still usually pop one time after I cut it. If I am able to ease off slowly, it usually won't pop. Didn't seem to pop at all at normal street rpm even after the bike heated up. I still get the awesome rumble of small explosions at the end of the decel but i think that has been reduced some as well.

I will soon start adjusting my map and that may reduce the popping more. I kind of doubt it. I think popping would be caused by running rich and I don't think that could be the case with my setup/map.


* Last updated by: Rook on 11/20/2009 @ 7:40 PM *



'08 MIDNIGHT SAPPHIRE BLUE flies out, full Tsukigi Cannon exhaust, BMC race filter, Muzzy's block off plates, Super Sprox 17t output sprocket, AFM 45t rear sprocket, EK zzz 530 chain, Gilles Tooling axle adjusters, PC5, Romans map, AT-200, Ignition Module, LCD-200, Speedohealer V4, Glow-Shift gauges, Illumiglow 210 mph clock faces, HM PLUS quickshifter, Factory Pro EVO Shift Star, RC's oil pump cover, Moto-D magnetic oil drain plug, MIT billet oil filler cap, Shorai 14A2 Lithium battery, Spiegler SS clutch and brake lines, HyperPro RSC steering damper, LighTech fuel tank cap, Vortex rearsets, lightweight mudflap bracket, FP Racing preload adjusters, Ohlins FGRT807 forks and KA544 shock, Carrazzeria Tri-R wheels, Bridgeport 90° valve stems, CZ 320mm front rotors, Galfer rear wave rotor, Pazzo levers, ProBots Dzus fasteners and many other bolts replaced with aluminum or Ti, Vortex mirror blocks, CRG bar end mirrors, LSL frame sliders, axle sliders, billet bar ends, 2WheelWorkz muffler

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vjs


vjs's Gravatar

Location: Lithuania, EU

Joined: 11/27/09

Posts: 22

RE: PAIR block off to reduce backfire/popping
11/29/09 1:03 PM

Nice explanation. Thanks. :) Gonna do this mod. It fucks me popping all the time after went to Scorpion slip-ons.



K&N airfilter, Scorpion street extreme exhausts, MRA Racing windshields, P&L carbon crash protectors, all blacked out :)

www.motosfera.eu

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Grn14


Grn14's Gravatar

Location: Montana

Joined: 02/25/09

Posts: 14890

RE: PAIR block off to reduce backfire/popping
11/29/09 4:28 PM

"remove from sprocket side of bike"?????????????????????????????(Great how-to Rook-very good pics).(my engine must be in there backwards! ).


* Last updated by: blue07 on 11/29/2009 @ 4:30 PM *

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Romans


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Location: Toronto,ON

Joined: 02/13/09

Posts: 5924

RE: PAIR block off to reduce backfire/popping
11/29/09 5:55 PM

Good read rook. I think the guys on the old site called this the "Marble Trick". I guess they just stuffed a Marble in the hose, plugged it back in place and that was it done.

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Rook


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Joined: 03/28/09

Posts: 19462

RE: PAIR block off to reduce backfire/popping
11/29/09 8:34 PM

"remove from sprocket side of bike"?????????????????????????????(Great how-to Rook-very good pics).(my engine must be in there backwards! ).

OOps. Thanks for pointing that out. I changed it.

Incidentally, I recently had my clock cleaned by some guy on another forum regarding the explanaition as to why the the mod works. According to him, the PAIR system doesn't ignite fuel in the exhaust, per se, it ignites HCs (whatever that is) and the reason it ignites is because the reed valves ware out and fail, not because the exhuast has been changed to aftermarket. Whatever the exact causes are, the result is popping and this mod did reduce it for me. Be interesting to see if using blockoff plates on the reed valves would be a further improvement.

I think the guys on the old site called this the "Marble Trick". I guess they just stuffed a Marble in the hose, plugged it back in place and that was it done.

I have heard about the marble mod. Seems like it would work the same. I would find a marble that was biiger than the inside of the hose and put a zip tie above and below the bulge, then secure the zip ties together. That way, you know the mable can't go up or down. The only problem might be that there could be a permanent bulge left in the hose if you ever wanted to remove the marble. I guess I'm just nitpicky about that sort of thing so i opted for the dowel.



'08 MIDNIGHT SAPPHIRE BLUE flies out, full Tsukigi Cannon exhaust, BMC race filter, Muzzy's block off plates, Super Sprox 17t output sprocket, AFM 45t rear sprocket, EK zzz 530 chain, Gilles Tooling axle adjusters, PC5, Romans map, AT-200, Ignition Module, LCD-200, Speedohealer V4, Glow-Shift gauges, Illumiglow 210 mph clock faces, HM PLUS quickshifter, Factory Pro EVO Shift Star, RC's oil pump cover, Moto-D magnetic oil drain plug, MIT billet oil filler cap, Shorai 14A2 Lithium battery, Spiegler SS clutch and brake lines, HyperPro RSC steering damper, LighTech fuel tank cap, Vortex rearsets, lightweight mudflap bracket, FP Racing preload adjusters, Ohlins FGRT807 forks and KA544 shock, Carrazzeria Tri-R wheels, Bridgeport 90° valve stems, CZ 320mm front rotors, Galfer rear wave rotor, Pazzo levers, ProBots Dzus fasteners and many other bolts replaced with aluminum or Ti, Vortex mirror blocks, CRG bar end mirrors, LSL frame sliders, axle sliders, billet bar ends, 2WheelWorkz muffler

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Rook


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Joined: 03/28/09

Posts: 19462

RE: PAIR block off to reduce backfire/popping
11/29/09 9:06 PM

The clock cleaning went something like this. This guy sounds like he knows what he's talking about. He is not DISrecomending the mod but note the warning about disabling the PAIR if you have cats in the exhaust system.

a few things..
the air induction is designed to lower HC emissions on a motor..
it will make the system run hotter (as unburned hc's are consumed)
It has little or no effect on the catalytic converters as they work on a chemical reaction to consume NOX and excess HC's.. IF there is excessive HC in the exhaust flow, it can overheat and physically melt the CAT down.. So , removing the PAIR system "could" cause problems on that count............

Airbox pressure.. there is not a chance that the PAIR system is going to affect air box "pressures" not sure where that would even come from.. the volume of air required in either direction would have to be massive..

The "problem" that arises with the P.A.I.R. system is that the reed valve or control valve fail.. this allows air flow through the system at off throttle/decel/ high vacuum conditions.. This allows the air flow to enter the pipes where the unburned HC's go "off" in explosions.. (not good for the bike either)

It is just cheaper to block it off than repair or replace the control valve..


* Last updated by: Rook on 11/29/2009 @ 9:12 PM *



'08 MIDNIGHT SAPPHIRE BLUE flies out, full Tsukigi Cannon exhaust, BMC race filter, Muzzy's block off plates, Super Sprox 17t output sprocket, AFM 45t rear sprocket, EK zzz 530 chain, Gilles Tooling axle adjusters, PC5, Romans map, AT-200, Ignition Module, LCD-200, Speedohealer V4, Glow-Shift gauges, Illumiglow 210 mph clock faces, HM PLUS quickshifter, Factory Pro EVO Shift Star, RC's oil pump cover, Moto-D magnetic oil drain plug, MIT billet oil filler cap, Shorai 14A2 Lithium battery, Spiegler SS clutch and brake lines, HyperPro RSC steering damper, LighTech fuel tank cap, Vortex rearsets, lightweight mudflap bracket, FP Racing preload adjusters, Ohlins FGRT807 forks and KA544 shock, Carrazzeria Tri-R wheels, Bridgeport 90° valve stems, CZ 320mm front rotors, Galfer rear wave rotor, Pazzo levers, ProBots Dzus fasteners and many other bolts replaced with aluminum or Ti, Vortex mirror blocks, CRG bar end mirrors, LSL frame sliders, axle sliders, billet bar ends, 2WheelWorkz muffler

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Grn14


Grn14's Gravatar

Location: Montana

Joined: 02/25/09

Posts: 14890

RE: PAIR block off to reduce backfire/popping
11/30/09 12:30 AM

Yo Rook-you do know I wasn't putting your how-to down-right?Okay?-I wasn't.


* Last updated by: blue07 on 11/30/2009 @ 12:30 AM *

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Rook


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Joined: 03/28/09

Posts: 19462

RE: PAIR block off to reduce backfire/popping
12/01/09 4:28 AM

I read you right. It never hurts to point out inaccurate info like 'wrong side.' Just ask a surgeon! Hope I never have a lung removed but if I do, they better get the right one -----ooo, the CORRECT one.


* Last updated by: Rook on 12/1/2009 @ 4:28 AM *



'08 MIDNIGHT SAPPHIRE BLUE flies out, full Tsukigi Cannon exhaust, BMC race filter, Muzzy's block off plates, Super Sprox 17t output sprocket, AFM 45t rear sprocket, EK zzz 530 chain, Gilles Tooling axle adjusters, PC5, Romans map, AT-200, Ignition Module, LCD-200, Speedohealer V4, Glow-Shift gauges, Illumiglow 210 mph clock faces, HM PLUS quickshifter, Factory Pro EVO Shift Star, RC's oil pump cover, Moto-D magnetic oil drain plug, MIT billet oil filler cap, Shorai 14A2 Lithium battery, Spiegler SS clutch and brake lines, HyperPro RSC steering damper, LighTech fuel tank cap, Vortex rearsets, lightweight mudflap bracket, FP Racing preload adjusters, Ohlins FGRT807 forks and KA544 shock, Carrazzeria Tri-R wheels, Bridgeport 90° valve stems, CZ 320mm front rotors, Galfer rear wave rotor, Pazzo levers, ProBots Dzus fasteners and many other bolts replaced with aluminum or Ti, Vortex mirror blocks, CRG bar end mirrors, LSL frame sliders, axle sliders, billet bar ends, 2WheelWorkz muffler

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Rook


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Joined: 03/28/09

Posts: 19462

RE: PAIR block off to reduce backfire/popping
12/01/09 9:27 PM

This racing Kit-ECU for Kawi's, tells you to remove the PAIR system and close off the valve cover inlets.

I may do that this winter with some reed valve plates. There is still some air left in the hose between the dowel (or marble or whatever you use to block the hose) and the reeds. It could be enough to get sucked into the exhaust on decel and cause a pop here and there. Block off at the reed valves may give best results....or it may be throwing away $60.



'08 MIDNIGHT SAPPHIRE BLUE flies out, full Tsukigi Cannon exhaust, BMC race filter, Muzzy's block off plates, Super Sprox 17t output sprocket, AFM 45t rear sprocket, EK zzz 530 chain, Gilles Tooling axle adjusters, PC5, Romans map, AT-200, Ignition Module, LCD-200, Speedohealer V4, Glow-Shift gauges, Illumiglow 210 mph clock faces, HM PLUS quickshifter, Factory Pro EVO Shift Star, RC's oil pump cover, Moto-D magnetic oil drain plug, MIT billet oil filler cap, Shorai 14A2 Lithium battery, Spiegler SS clutch and brake lines, HyperPro RSC steering damper, LighTech fuel tank cap, Vortex rearsets, lightweight mudflap bracket, FP Racing preload adjusters, Ohlins FGRT807 forks and KA544 shock, Carrazzeria Tri-R wheels, Bridgeport 90° valve stems, CZ 320mm front rotors, Galfer rear wave rotor, Pazzo levers, ProBots Dzus fasteners and many other bolts replaced with aluminum or Ti, Vortex mirror blocks, CRG bar end mirrors, LSL frame sliders, axle sliders, billet bar ends, 2WheelWorkz muffler

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darryle


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Location: ontario

Joined: 02/15/09

Posts: 1163

RE: PAIR block off to reduce backfire/popping
12/02/09 7:24 AM

O n my ZRX I removed it entirely and installed block off plates,On my ZZR12 I removed it rotated the 90's to face each other and installed a hose barb.Just wondering if tying the plates together like that could create a problem?



2012 14R,full hindle Evolution ,vortex rear sets,BST's with ceramic bearings,HID's,hyper pro damper and custom map 205.3 hp/120.2 torque

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Rook


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Joined: 03/28/09

Posts: 19462

RE: PAIR block off to reduce backfire/popping
12/02/09 7:47 PM

^^Seems to me all you are doing by connecting them with a short hose is blocking them. I think putting a cap over each would achieve about the same thing.

The solenoid (as they call it) that the hoses connect up to is mounted into some sort of rubber bracket. It moves around a lot when you try to pull the hoses off. The hoses are on there pretty tight. I was afraid of tearing the rubber so I decided i would not try to remove the hoses. I would rather just take the whole thing off and put plates over the reeds.


* Last updated by: Rook on 12/2/2009 @ 7:51 PM *



'08 MIDNIGHT SAPPHIRE BLUE flies out, full Tsukigi Cannon exhaust, BMC race filter, Muzzy's block off plates, Super Sprox 17t output sprocket, AFM 45t rear sprocket, EK zzz 530 chain, Gilles Tooling axle adjusters, PC5, Romans map, AT-200, Ignition Module, LCD-200, Speedohealer V4, Glow-Shift gauges, Illumiglow 210 mph clock faces, HM PLUS quickshifter, Factory Pro EVO Shift Star, RC's oil pump cover, Moto-D magnetic oil drain plug, MIT billet oil filler cap, Shorai 14A2 Lithium battery, Spiegler SS clutch and brake lines, HyperPro RSC steering damper, LighTech fuel tank cap, Vortex rearsets, lightweight mudflap bracket, FP Racing preload adjusters, Ohlins FGRT807 forks and KA544 shock, Carrazzeria Tri-R wheels, Bridgeport 90° valve stems, CZ 320mm front rotors, Galfer rear wave rotor, Pazzo levers, ProBots Dzus fasteners and many other bolts replaced with aluminum or Ti, Vortex mirror blocks, CRG bar end mirrors, LSL frame sliders, axle sliders, billet bar ends, 2WheelWorkz muffler

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AZ14



Location: NW Phx, Arizona

Joined: 02/23/09

Posts: 54

RE: PAIR block off to reduce backfire/popping
12/02/09 8:59 PM

Where is the crank case vent? I like the idea of running a hose from the solenoid to it instead of the air box.

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AZ14



Location: NW Phx, Arizona

Joined: 02/23/09

Posts: 54

RE: PAIR block off to reduce backfire/popping
12/03/09 8:41 AM

Ok Hub, bad idea. I have plugged the intake hose. You see any problem with removing the system entirely?

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Rook


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Joined: 03/28/09

Posts: 19462

RE: PAIR block off to reduce backfire/popping
12/03/09 6:45 PM

Where is the crank case vent? I like the idea of running a hose from the solenoid to it instead of the air box.
There are mixed opinions as to how much improvement will occur from a source of vacuum such as the PAIR system. Cars that have Positive Crankcase Ventilation use an actual pump to create a stronger vacuum that what we have with the PAIR system (which I think is pretty much just a vacuum created by the exhaust flow). My feeling is that this mod has been known of long enough and you don't hear many people trying to make a PVC out of the PAIR. It probably isn't worth while. You could visit bikeland ZX14 forum and ask there.



'08 MIDNIGHT SAPPHIRE BLUE flies out, full Tsukigi Cannon exhaust, BMC race filter, Muzzy's block off plates, Super Sprox 17t output sprocket, AFM 45t rear sprocket, EK zzz 530 chain, Gilles Tooling axle adjusters, PC5, Romans map, AT-200, Ignition Module, LCD-200, Speedohealer V4, Glow-Shift gauges, Illumiglow 210 mph clock faces, HM PLUS quickshifter, Factory Pro EVO Shift Star, RC's oil pump cover, Moto-D magnetic oil drain plug, MIT billet oil filler cap, Shorai 14A2 Lithium battery, Spiegler SS clutch and brake lines, HyperPro RSC steering damper, LighTech fuel tank cap, Vortex rearsets, lightweight mudflap bracket, FP Racing preload adjusters, Ohlins FGRT807 forks and KA544 shock, Carrazzeria Tri-R wheels, Bridgeport 90° valve stems, CZ 320mm front rotors, Galfer rear wave rotor, Pazzo levers, ProBots Dzus fasteners and many other bolts replaced with aluminum or Ti, Vortex mirror blocks, CRG bar end mirrors, LSL frame sliders, axle sliders, billet bar ends, 2WheelWorkz muffler

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Rook


Rook's Gravatar

Joined: 03/28/09

Posts: 19462

RE: PAIR block off to reduce backfire/popping
05/06/17 8:46 PM

updated



'08 MIDNIGHT SAPPHIRE BLUE flies out, full Tsukigi Cannon exhaust, BMC race filter, Muzzy's block off plates, Super Sprox 17t output sprocket, AFM 45t rear sprocket, EK zzz 530 chain, Gilles Tooling axle adjusters, PC5, Romans map, AT-200, Ignition Module, LCD-200, Speedohealer V4, Glow-Shift gauges, Illumiglow 210 mph clock faces, HM PLUS quickshifter, Factory Pro EVO Shift Star, RC's oil pump cover, Moto-D magnetic oil drain plug, MIT billet oil filler cap, Shorai 14A2 Lithium battery, Spiegler SS clutch and brake lines, HyperPro RSC steering damper, LighTech fuel tank cap, Vortex rearsets, lightweight mudflap bracket, FP Racing preload adjusters, Ohlins FGRT807 forks and KA544 shock, Carrazzeria Tri-R wheels, Bridgeport 90° valve stems, CZ 320mm front rotors, Galfer rear wave rotor, Pazzo levers, ProBots Dzus fasteners and many other bolts replaced with aluminum or Ti, Vortex mirror blocks, CRG bar end mirrors, LSL frame sliders, axle sliders, billet bar ends, 2WheelWorkz muffler

Link | Top | Bottom


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