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oldcorollas
Forums Junkie

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

Re: 4A-GZE pistons, the TRUTH!

Fri, 25 June 2004 13:09

i honetsly had no idea what had gone on before, but i have a pretty good idea now.. he even stirs shit on video forums and computer forums too!!!

he also posted to dorikaze

http://www.dorikaze.com/showthread.php?t=1276

i feel compelled to reply so that others are not so misinformed..

i have not found the GZE pistons to be forged, but i have observed flow lines characteristic of forging, but after speaking to my professors at my university, i think that 'squeeze-casting/semi-solid forming/thixotropic casting' are all possibilities, but they all have characteristic microstructures and should be fairly easy to tell the difference.

i have observed a 'coating' on the order of 15 microns thick. it has an undulating surface which is similar to that formed from plasma spraying, but i have not analysed the chemistry or crystallography of the coating yet.

it should be trivial to do with a low-angle XRD machine, a RAMAN spectroscopy machine, and EDS analysis in an SEM.

if the need arises, i do have the option of some late night ion milling to make a TEM sample, which which absolutely determine the crystal structure if it is indeed crystalline.. unfortunately this requires around 10-15 hours of electron microscope beam time......

thanks Karl, i'll be cutting it up on monday Very Happy

should be able to run some tests this week.

AWESOME Very Happy

, thanks heaps Mick. it will be very very interesting to compare the differences. hopefully i should be able to pop down on sunday after lunch.. what time is the last race??

i now feel like a wasted a good 15 minutes replying to his emails, trying to find out more information as i am seriously interested in finding out more, only to have him declare that he knows and doesn't need me to do any testing for HIM!!!

does anyone kow what he meant when he said

Quote:

CybaSmuggla
Member
Registered: Nov 2002
Location:
Posts: 57
03-06-2003 10:57 AM .

Thx for the kind words SKD,Its a Toyota Levin/Trueno origin "Blacktop" 4AGE 1.6lt 20 valve.
5 valves per cylinder design by Yamaha,has variable valve timing,and quadthrottles.
Its bottom end was destroyed in an accident in Japan,holes in the block,I got a hold of it and rebuilt it,ported...balanced,the usual garb,the pics are from a video of its rebuild,some of its componentry is appealing even to the layman.I'll be adding to it,so I can let you know if you like.
Theres some 16V pics also.All the work is my own.Cheers.
http://www.pbase.com/pentavalver/100kw_16v

http://forum.digital-digest.com/archive/topic/1728 0-1.html

he fixed a block with holes in it?? whu??

anyways, for better or wrose, the pistons will still be analysed Wink

Cya, Stewart

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