Sorry I didnt know about the username thing...
I have a JDM WRC hence my statement on the Bhp, most people have a JDM WRC *;)
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2500 WRC cars were sold...
2100 were sold in Japan and 400 to the rest of the world...
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Fensports in the UK can verify that there ARE thin & thick blocks.
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the thinner walled blocks appear to be 1994ish, but no one can tell for sure. Only way to find out is to ultrasound test the cylinder bores approx 25mm from top of cylinder 2.
Regards
Adrian
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Adrian From Fensport quote above.
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Initial results from an ultrasound indicate that the block I have is a thick walled block.
All cylinders measure a wall thickness of ~6.0mm or more.
I did notice a very small section of the block directly between cylinders 2 and 3 was thinner than all other areas. This measured ~4.2mm and was ~60mm from the top of the block.
From a post Adrian mentioned before a thin walled block is deemed to be ~2.8mm thick whereas a thick walled block is >3.8mm.
There were 2 blocks supplied by Toyota:
11401-79675 – manufactured 94/02 > 98/01
11401-79676 – manufactured 98/01 > 99/08
All blocks now supplied are the later type. The revisions to the block are unknown, apparently this was just a part number change but I'm sceptical.
Apparently the risk of a thin block is a lot lower if the later block is bought.
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Verification from another GT4 owner quote above.
& here is the last quote again from Adrian of Fensports:
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Toyota have changed the part numbers for the 205 block, they nor TTE or TRD or anyone else will admit to there being a problem on some blocks.
The problem is generally between 2&3 cylinder although we have recently found thin areas at the rear of no4.
A thick wall block will be between 150-160 thou thick, and a thin one will be approx 110 thou.
Now the problem comes when you ask "how thick for how much BHP"
This is not an easy question to answer, my advice is don`t build any block less than 140thou unless its going to be left standard.
Measuring the block is not at all easy, best use an engineer who can ultrasound test the average thickness - I say average as - If you imagine the outer side of the cylinder is not uniform.
450whp is approx 570 flywheel which is big power in my book, I would not use any bigger than 86.25 bore on a thicker type block.
TTE group A blocks are fine, but hard to get hold of, and very expensive as you`ll need special pistons as well, the block is 3mm lower deck height.
I use a standard block as I don`t beleive tte one is the right approach for us, for one they will run out - then what do we all do? For another the expense.
Only last week we rejected two ST205 blocks for rebuild, 1 was 120thou, and the other 110 thou, this was particularily annoying as I thought they were all ok - just shows you trust no-one, and measure everything.....
Hopefully that`ll save some expensive mistakes!!!
Some people don`t believe what we say - they think we make it up to sell blocks - all I can tell you is what I have found - the rest is up to you.
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So that leads me to believe you have got the wrong information.
Dont know who Fensports are...
http://www.fensport.co.uk/
& check out the Corolla in the Fensports Cars section... thats the "Thick" walled 3S-GTE.