| Author | Topic |
|---|
Location:
Sydney
Registered:
May 2002
|
|
4AGE piston differences
|
Tue, 29 October 2002 01:02
|
 |
This is mainly for my general knowledge but i hope someone out there (Toby/Bill) has seen a few more 4AGE intrenals, can fill in the gaps.
Ok its my understanding so far that these are defineately 86KW pistons, dished centre accounts for lower compression??
Its the next two pistons that im confused about
First is the ACL Replacemant 100Kw. no dishing, flat in centre higher compression??
The next one is the one i just pulled out of my car, 100KW toyota with a raised centre (presumably higher compression again)
Now to my question, is the ACL replacement 100KW piston that way to save manufacturing costs or is there are 3 types of pistons???
Cheers
Ben
AE86 Trueno 4AGE
|
|
|
Location:
Central Coast
Registered:
June 2002
|
|
Re: 4AGE piston differences
|
Tue, 29 October 2002 09:54
|
|
Manufacturing cost would have been the main consideration behind the design of the top of the ACL piston.
Although I’m sure ACL has considered the compression ratio in their design, and should be no difference between them.
Although Toyota isn’t stupid, and does a lot of engineering research, So the raised center may be beneficial in some way.
|
|
|
Location:
Canberra
Registered:
May 2002
|
|
Re: 4AGE piston differences
|
Tue, 29 October 2002 10:55
|
|
|
The factory toyota 86kw pistons I have here dont look like that top picture. The valve reliefs are not as deep, which would maybe suggest that the deck height of the whole piston top might be lower to drop compression rather??
|
|
|
Banned by his request
Location:
moved to tamworth
Registered:
July 2002
|
|
Re: 4AGE piston differences
|
Tue, 29 October 2002 11:34
|
|
the first is a 8-1{early gze} piston the second is 8.9-1{late gze} and the third is a 100kw 9.4 or 10.3 or something like that.
there is 4 diffrent pistons from memory, been awhile since i looked into it. i have had every one of them at times and im pretty sure the above is right. cc them then youll know for sure.
mick
|
|
|
Location:
Sydney
Registered:
May 2002
|
|
Re: 4AGE piston differences
|
Tue, 29 October 2002 11:52
|
|
Just a note, the deck height (the distance from the top of the Pin to the very outside edge of the piston anyway)is the same for all the pistons, The toyota one is taller overall due to the raised centre, as for being GZE pistons they are not marketed as that so ????
Ben
AE86 trueno 4AGE
|
|
|
Location:
Sydney, OZ
Registered:
May 2002
|
|
Re: 4AGE piston differences
|
Tue, 29 October 2002 22:49
|
|
Ben,
The top piston does look very similar to an FE piston. It's hard to see the valve angle to be 100% sure from the photo, but also I really haven't see a set of 86Kw pistons either. The only differences I can say is that there's more "raised" area's than on an OEM FE piston.
The second ones are 100kw replacement for sure, I have a set of forgies that look Identical to that in two engines, one a 4age, the other is my 7AFE, and they sure do have a high comp that standard, but that's due to the piston heights. see pic below
|
|
|
I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
|
|
Re: 4AGE piston differences
|
Wed, 30 October 2002 20:00
|
|
|
i have a set of 86kw pistons at home i'll clean one up and photo it then post it up if you guys want? let me know..
|
|
|
Location:
Sydney, OZ
Registered:
May 2002
|
|
Re: 4AGE piston differences
|
Wed, 30 October 2002 22:49
|
|
| Quote: |
i have a set of 86kw pistons at home i'll clean one up and photo it then post it up if you guys want? let me know
|
Please do.
|
|
|
I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
|
|
Re: 4AGE piston differences
|
Thu, 31 October 2002 00:20
|
|
|
okies will do tonite.
|
|
|
I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
|
|
Re: 4AGE piston differences
|
Thu, 31 October 2002 06:00
|
|
okies here we go :
there is a U stamped on there, with a 1 also stamped on there
the numbers on it say 16020
another pic top down
these are from an 86kw RWD config motor.
any issues let me know
|
|
|
Location:
Canberra
Registered:
May 2002
|
|
Re: 4AGE piston differences
|
Thu, 31 October 2002 11:08
|
|
|
Yup, that looks just like the 86kw FWD ones I have. I think the number stamped on top is the size indicator. Toyota use different sizes if neccessary in individual cylinders to match the tolerances for that particular bore perfectly.
|
|
|
I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
|
|
Re: 4AGE piston differences
|
Thu, 31 October 2002 19:44
|
|
|
yeah unfortunately these pistons are a bit beyond it...
|
|
|
Location:
Sydney
Registered:
May 2002
|
|
Re: 4AGE piston differences
|
Fri, 01 November 2002 06:06
|
|
Well at lease you were able to show us they are very simiar to the ACL equivelant
Thanks
Ben
AE86 Trueno 4AGE
|
|
|
Location:
Sydney, OZ
Registered:
May 2002
|
|
Re: 4AGE piston differences
|
Fri, 01 November 2002 15:48
|
|
Thanks, Grega
You can clearly see the 100Kw would have a lot more comp, if the combustion chamber of the 100Kw head isn't different to the 86Kw....
|
|
|
I supported Toymods
Location:
melbourne.victoria.austra...
Registered:
June 2002
|
|
Re: 4AGE piston differences
|
Fri, 01 November 2002 20:49
|
|
where is bill.......we need bills thoughts on this... 
|
|
|
Banned by his request
Location:
moved to tamworth
Registered:
July 2002
|
|
Re: 4AGE piston differences
|
Sat, 02 November 2002 04:16
|
|
ill have a look at all the types i have which is all 4ag,4agze and will tell you guys on monday night or so.
mick
|
|
|
