4age tech question?

[terryo]

I have a 7 rib block in my workshop that does not have squirters. I've checked with Toyota spares and they confirm the OZ sold twin cam corolla seca only got squirters for about 9 months . I believe these all had 7 rib blocks
I have seen small port heads with and without the drain.
The stock GZE pistons I have, are definitely not forged. the unhead shape is a dead give-away. I dont recall what year engine they came from.
I've never seen any other 4A engine with the same rod as a GZE, but thats not to say it does not exist. It is definitely not the same as any 86, 100kw or 20V I've stripped

[Big T]

This is a stock GZE piston.





Can't really see it that well in the pic but it's definately dished about 2mm in the centre.

Eddie.

[feral4mr2]

Having torn down a 4AGE or two in my time heres what i can confirm

3 rib blocks never came with oil squirters GE or GZE.

the 4agze never came in a 3 rib block.

7 rib blocks all have oil squirters including the 7 rib with the bigport head.

no bigport 7 rib block wether it be a 4age or a 4agze came with oil squirters (yes i have pulled down and rebuilt a few of these).

the only engines i have 'personaly' seen the oil squirters in has been a smallport 4agze and a 20 valve engine. though all smallport engines are spose to have the oil squirter block.

[ira11y]

the 4agze never came in a 3 rib block.

actually they did very early GZE's had the 3 rib block it wasnt for long but they did have them, thats why you will also find the crossover 7rib block with the big port head, toyota tended to intorduce the developments of the 4AGE and its variants in stages.

no bigport 7 rib block wether it be a 4age or a 4agze came with oil squirters (yes i have pulled down and rebuilt a few of these).

the only engines i have 'personaly' seen the oil squirters in has been a smallport 4agze and a 20 valve engine. though all smallport engines are spose to have the oil squirter block.

yeah ive pulled down the odd one or two as well... I personally have not seen a 7 rib block without oil squirters, not to say that there may not be some out there, just ive never seen one.

[oldcorollas]

The stock GZE pistons I have, are definitely not forged. the unhead shape is a dead give-away. I dont recall what year engine they came from.

did their cross-section look like this?

and structure look like this
http://www.materials.unsw.edu.au/~sford/flowlines1.jpg

[feral4mr2]

actually they did very early GZE's had the 3 rib block it wasnt for long but they did have them,

gotta say it's the first time i've ever seen reference to a 3 rib 4agze... ever. but if you've seen one.

so far i've only had apart 4, 7 rib bigport engines (and seen another in bits) and 2 smallport, none of the bigports had oil squirters though. where any of the 7 rib engines you had apart bigport head ones?






wohoo.. my old gze piston..

[ira11y]

the only 7 rib bigport ive ever had apart in any way was my cousins AE82 seca, it had a blown headgasket and as there was no need to pull the block down i never got to see the internals.

[benjamin]

Does anyone know what the volume of dish is in the 8.9:1 gze piston?

[myne]

8.9:1 is nearly at the NA engine's 9.4:1. I doubt there's much noticable dishing. If anything, I'd expect them to be more or less flat.

Also, as far as I know, it's possible to fit oil squirters to blocks without them. They shouldnt cost much to fit.

[benjamin]

There definitely is dish. The 8.9 piston is on the right. There is quite a difference between a CR of 8.9 and 9.4. The piston on the left is for an 8.0 CR and they have a dish volume of 12cc

[oldcorollas]

there is definitely dish, but it is not very deep, and it is a smoth curve, instead of a flat centre section like the one on the left...

also.. the valve cutouts are EXACTLY the same depth from the crown for BOTH GZE pistons.

[feral4mr2]

top view, 8.0:1 on left, 8.9:1 on right

[boar]

also 86 kw did not come wit knock sensors
but the 100kw aus versions did

[The Witzl]

i thought i made an FAQ thread to answer these questions and many like them....

.... how about you read the FAQ - yes, click it.

[Draven]

I thought Stu with his electron magnetiscope piston bisector laser thingy of doom settled this argument once and for all?