66mm crank number stampings

[kenikh]

I have crank that is stamped "D665540". Common sense dictates this is probably a 66mm crank, due to the number. I was also told the engine is a 2.2, so that checks as well. I searched and this stamping nubmer comes up in no searches. Can anyone confirm?

[YTNUKLR]

Kenik, post a picture of the crank, you can tell very easily by the size of the oil holes (or the rod journal dimensions, or the rod part numbers).

Best

Scott

[kenikh]

How about this?

[YTNUKLR]

Counterweighted 2.0/2.2 crank...oil holes are a bit smaller than on the 2.7 (on the rod journals at least). The rods are 2.0 if they have 901 part numbers. 2.4 rods are 911.103.105 and 2.2 rods are 911.101.103 IIRC. What are your plans? I'm thinking NCW T crank, 2.0 rods, JE 85mm pistons at 10:1+, DC40s...?

Cheers
Scott

[kenikh]

I'll be using the C/W crank and lighten the rotating mass at the flywheel. I don't want the crank tearing my 1R case apart with vibration. Everything else you mentioned sounds good, except for the pistons...can you say 89mm on Nickies in a stock 2 liter spigot bore? It can be done...

[YTNUKLR]

S%*T! You're making a 2.5L out of your original '69S motor?

[Henry Schmidt]

Originally posted by kenikh
...can you say 89mm on Nickies in a stock 2 liter spigot bore? It can be done...

No, you can't put a 89 mm cylinder in a stock 2.0 spigot.
If you put a 89mm barrel in a 91.5mm spigot the barrel is too thin and will break.
The largest piston/cylinder combination you can put in a stock 2.0-2.4 spigot (91.5mm) is an 86mm bore. These are our 86mm Nikasil cylinders. This gives you an engine size of 2300 cc. on a 66mm crank and 2450 on a 2.4-2.7 70.4mm crank.
86mm



The easiest way to tell a 2.0/2.2 (66mm) crank from a 2.4/2.7 also a 3.0 turbo (70.4mm) is to look at the flywheel end of the crank. The 66mm has 2 galley holes and the 70.4 mm crank only has one.
66MM



70.4MM



CRANK ANYONE?

[kenikh]

It is undeniably a 70.4mm crank, then. Very interesting.