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Originally Posted by T41303
Im am now collecting parts for my 2666 cm T4 engine. The crank is a oettinger 80mm and I am planning to use a Mahle 103 kit with 22 wrist-pins.
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Actually, most all rod lengths will work. I like a larger rod ratio, so I would suggest 5,5" or larger. I had an Oettinger 80mm crank and used 5,7". Just don't use the original rods, which will be tempting as the journal diameter of your Oettinger crank is 50mm, same as stock 2.0
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Another question I am thinking of is if the 48 IDF will be to small , or will they work just fine on a 2666 with max rpm. 6000-6500 ?
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Depends on your cam and heads. If you are going to make more than say 190 hp, then 48 IDF's will be restricting, even with 40 or so vents. I have seen it myself they restrict above 200-220 hp, and my guess is they leave hp on the table below that as well, hence the hp-guesstimate they will work up to.
Most engines work very well though with them and the only upgrade would be EFI with 45 or 48mm Throttle bodies, so your must really upgrade heavily or leave the 48IDF's be and see what they make.
Regards,
Walter