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Engine Specific Info and Questions => IDI Engine => Topic started by: mk3pete on July 11, 2015, 05:33:06 am
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ok so im building my aaz up from scratch! it was originally going to be a basic refresh but turns out my bores were flogged and had a bent rod.
il be running 1mm oversize nural pistons
roston h beams
Dieselmeken 11mm pump
holset he200wg
arp everything
ported head
hoping to make 30 to 35 psi
what would a recommended cr be? i know il be lowering from standard but how much lower?
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You will be fine at the stock levels for aaz, I think that was around 22:1 for that engine. Cutting the dish out in the piston, porting the prechamber, or undercut valves are the only way I would take compression down.
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That build will not last long unless you have a crank girdle. Otherwise you will break a main.
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I wonder what it is about the AAZ blocks that seems to make them so much more prone to breaking mains. Seen more than a few now. The TDI blocks don't seem to have as much of an issue despite being virtually the same.
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65mm main bolts came in some aaz, the others had 80mm like the tdi. I would guess that is a part of it.
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I was thinking about a girdle but wasnt sure if I need longer bolts to torque it down? If so anyone know where to order. Or any other requirements I need to run one.
Roston do a girdle and that's where im buying most of my parts.
Might have to throw him an email.
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Maybe someone might be kind enough to release a drawing of one so I can machine it up myself?
Dads got a milling machine at home so il get some 6 mm plate! Bright steel would be best as theres no mill scale on it to worry about cleaning up.
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Sandblasting will remove scale as well ; - )
Not sure what you goals are but make sure the rest of the vehicle is up to the increase if your goal is reliability.
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Im already running o2a and bigger clutch also g60 brakes, I have another built box on my vr6 im thinking about swapping into the td 3.94 rp peloquin and tdi 5th.