Toymods Car Club Inc: Tech & Conversions => 4A-GZE pistons, the TRUTH!

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oldcorollas
Forums Junkie

Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003

Re: 4A-GZE pistons, the TRUTH!

Thu, 24 June 2004 11:34

well, after a number of emails from this guy, and trying to explain that there is no

Quote:

Well,basically a spectrum analysis is whats needed,I would expect these
lasers to offer the same sort of breakdown as a blood tester..in the way of
silicon,magnesium alumina ...a spectral read out of all constituents.This
sort of analysis leaves no need for human interpretation,or is this too CSI
Miami? ;o)

i tried to explain the analysis options available, but it seems this guy wants a machine that you put a smaple in and the "TRUTH" comes out with no human intervention (ie bias)

and this is his final say in the matter Wink

Quote:

OK,so its all just your opinion of what you perceive.I dont need you to do any more tests for me because I know what they are.I think the volume of info i provided speaks for itself as to whether or not its rumour.

all he said was

Quote:

Hello,I'm not wanting to start a fight,but the ZE piston is not forged
there pressure cast.No OEM Toyota piston apart from genuine TRD are forged.There also coated with Teflon,not ceramic.I've personally coated 100K/W pistons with ceramic and there composites are completely different.You can see for yourself here: http://www.pbase.com/pentavalver
When I had the coating applied at HPC they queried if I wanted to coat the teflon with ceramic.
The main problem I see with your info is that there are now dogs sellingcast pistons at forged prices along with misinformation across the internet.

he persoanlly applied the coating when he got HPC to do it.. uh huh

Quote:

Stuart,thx for the reply.I know it sounds lame,but I have no "hard" evidence other than a rockwell hardness test carried out long ago.The finding was that the metal is not dense enough to be forged and they contained too high a level of silicon.
Along with both Bob Holden and John Falkner informing me of them being cast over a decade ago.I cant tell you of the process used,never been to the factory.
Yes,your right,the concept of the teflon was to prevent carbon build up,causing detonation/preignition,as the 1st gen ZE had no knock sensor control(remember this was probably 1975 knowledge).HPC knew of teflon being used in some Japanese OEM's and they told me the ceramic,though it cant be removed from metal it may not adhere to the teflon. Ofcourse,I knew more than they did and told them to apply it. I was a tad dissapointed when I could scrape the ceramic off with my finger nail. Surprised

(
The teflon didnt work by the way...I pulled down an early ZE and it was caked in carbon.
The flow of grain is characteristic of any pressure type casting/forging
process,as you'd understand.Toda use a 3 tonne die to forg.Without something
of that nature to compare,it makes it a little 1 sided.
Tests to try? well,melting them down and testing for silicon content would
be a good one,this would determine if there hypo or hyper,along with a sheer
test,but its all 1 sided without a true forged item to compare to.
A couple of other points,if the ZE is a forged item,it would make it the only forged piston in Toyotas line up from the 2jz to turbo diesels,along with the price difference of $80-$100 V's TRD's $280 for a 13.4:1 item.Forging costs money.
And I will tell u this tidbit,an easy way to pick a casting from a forging is to turn the piston over,if its curved nicely around the gudgeon its pressure cast,if its machined flat under the gudgeon its been forged and machine finished.
Thx for the pic's by the way,the most interesting thing I found was even with the difference in C/R's the crown thickness was much the same,interesting.

and the clincher

Quote:

Stuart,the only reason I mailed u about this was that u were doing some real world analysis and your posts seemed quite cordial and I figured u might want some feedback on your efforts.
You can allready see the effect your info and standing has by the comments in the latest thread.People are just happy to believe what there told.
Do these machines u speak of actually process the input data or is it up to u to make an assumption on what you see?

well duh.....

i want feedback, but not for someone to tell me i'm wrong cos some guy down the pub told them something...

ps, if MODS want me to remove his comments, so be it... but i thought his original comments, which led to this thread being started, would be of general interest...

pps, comments about bill sherwood were removed Wink

[Updated on: Thu, 01 July 2004 06:07]

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