Quote:
ANGE wrote:
apparently its a stock a12 with a well sorted turbo setup making around 240rwhp.
I can hardly imagine that it's a 'stock' A12 that is capable of producing 240hp at the rear wheels. This would surely translate to about 300 at the flywheel
The pistons in the stock A12 are hypoeutectic [less than 12% silicone content] & are perfect for a 80 odd hp engine but will not hold up for long with the heat that comes from a power output of about 250hp/litre. Surely forgings would be needed to help get the compression to the right level & to live under the tremendous heat loads.
I don't think that the original unmodified round ports & small valves in a 'stock' 1200 head would pass enough air, even at high boost, with the original 'stock' cam, & boost would be dependant on the exhaust gas output through those little 28mm 'stock' exhaust valves which would be sorely tested at the temperatures involved with that power output.
I doubt that the 'stock' 1200 valve springs would hold up too well at those rpm & boost levels either, even the double GX springs, particularly with the heavy 'stock' lifters, pushrods & rockers.
I would be a bit worried about the untouched 'stock' con rods at those engine speeds too & I would stay well away from the flywheel since it is attached to a 'stock' undoweled crankshaft.
To be honest, I have my doubts that there is very much that is 'stock' about this engine at all apart from the displacement.
Power output from this capacity is none the less pretty damn impressive for a two valve pushrod engine.
Oh yeah, it still mekes A series noises for my money too.