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Thread: Turbo Pistons

Created on: 03/10/10 08:29 PM

Replies: 3

dubious


dubious's Gravatar

Location: Alberta

Joined: 10/07/09

Posts: 87

Turbo Pistons
03/10/10 8:29 PM

Turbo piston pics vs stock:

Underside box designs, and oil scavenge ports
MTC

JE

Stock

MTC left, JE right

stock

MTC valve reliefs

JE

stock

MTC

JE

Stock

Oil rings
Stock and JE right, MTC on left

Compression rings
Stock and JE right, MTC on left

Things to Note,
JE has superior finnish machining everywhere especially on the dome, and smooth reliefs
MTC has sharp edges that require extra work to prep safely , the sharp edges will begin to burn, and then its a hot spot that will propogate if not removed. Looks like tool speed was too fast, or worn out tool.
Stock cast has by far the least ring land above top ring at the valve reliefs.
The stock oil scavenging ports are so small I have to think it doesn't scavenge! look at the needle holes!

MTC uses big rings, MASSIVE rings that should handle alot more abuse than standard rings, and has superior oil scavenging designsin piston, oil ring and wrist pin oiling.
MTC has massive boxed section around the wrist pin, and thickest dome.
MTC has the longest piston skirts for piston stability.
MTC comes with heavier tool steel pins
MTC had tighter amnufacturing tolerances than my JE pistons did.

stock piston with pin, no rings= 322gr
je piston with pin, no rings= 352 gr
MTC piston with pin, no rings= 364 gr

JE piston, no pin, no rings=263 gr
MTC piston no pin, no rings=253 gr

Yes MTC is heavier, but piston is not a place to cut weight or corners IMO.

Should note that the JE pistons had to have the pin bores machined, as they were so tight the pins couldn't be PUSHED in, never mind sliding in.
They only had about .002" instead of .004" clearance and my engine machinist said they would have seized in the pin bore.

I really don't think there is such a thing as a "DROP IN" piston.
Just too many variables to check and then check again and then again.

The pro seal rings I got from MTC did not fit their piston ring grooves properly either.... too tight, and so I went with their standard ring.

Each has their faults and will require attention.

The MTC pistons come with pins and rings, wheras the JE pistons no rings.
MTC Pistons= $550
CP pistons= $850 (quoted) + $200 rings= $1050
JE pistons= $700 + $200 for rings= $900

hmmm.... I will let everyone conclude for themselves.

I am not biased, just providing my experience.



2006 zx14.... aka fRAnKeNsTiEn still in progress,***470lbs and 500HP!***

waitin for the turbo

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Romans


Romans's Gravatar

Location: Toronto,ON

Joined: 02/13/09

Posts: 5923

RE: Turbo Pistons
03/13/10 6:38 PM

I am not biased, just providing my experience.

Good Read. Cheers

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9secondsflat



Joined: 03/08/10

Posts: 121

RE: Turbo Pistons
03/14/10 4:35 AM

and je are coated....

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dubious


dubious's Gravatar

Location: Alberta

Joined: 10/07/09

Posts: 87

RE: Turbo Pistons
03/15/10 9:04 AM

the coating was an additional ~$45 per piston


* Last updated by: dubious on 3/15/2010 @ 9:04 AM *



2006 zx14.... aka fRAnKeNsTiEn still in progress,***470lbs and 500HP!***

waitin for the turbo

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