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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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FAQ: 4A-GZE pistons, forged or not? ANSWER = yes
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Fri, 27 February 2004 17:21
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THe following is the result of some internet searching, and hard evidence research conducted by a higly qualified metallurist and electron microscope specialist.
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Are the 4A-GZE factory pistons produced by toyota forged?
Some say that they are "semi-forged", some say they are forged, some say they are just coated.
The truth is, that both types of 4A-GZE pistons that have been inspected and tested are indeed FORGED. Both the 8.0:1 type from the early AFM type GZE (MR2) and the latest model 8.9:1 from an AE101 GZE were tested. The early type sourced from a busted MR2 motor, and the late type being purchased from Toyota by myself personally (and verified from a busted piston donated by Mr Shin).
These late model, 8.9:1 compression pistons are available up to 0.5mm oversize from any Toyota parts dealer at a retail price of $100.00
If you would like to see the evidence, please read these threads:
4A-GZE piston thread 1
4a-gze piston analysis 1
GZE Piston analysis part 2
[Updated on: Wed, 10 March 2004 05:41] by Moderator
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