Rods for 9-bolt 66mm crankshaft?

blue72s · 10-22-2005, 05:47 PM

Did Porsche ever make steel rods for their race 9-bolt 66mm crankshaft? I understand they normally used titanium rods for their race cars but I wonder if they ever tried steel ones as well.

TIA.

Eagledriver · 10-22-2005, 08:28 PM

I don't know if Porsche used steel rods on this crank or not. What difference does it make? Do you want to use steel rods? I would think that any 2 or 2.2 litre rods would work. I could be wrong about this as I don't know if these rods are compatable with 3 litre pistons.

-Andy

BURN-BROS · 08:00 AM

Some of those cranks have a 2.4/2.7 liter rod journal, making a 2.0/2.2 rod useless. It also makes finding factory racing rods pretty difficult. The convenient way to solve this issue is to have custom rods made. If you do have one with 2/2.2 rod journals consider yourself lucky. Forgive me I as I have read into your question . I would suspect that all factory efforts with the crank had ti rods installed.

Henry Schmidt · Henry Schmidt's Garage

Quote:

Originally posted by BURN-BROS
............The convenient way to solve this issue is to have custom rods made.......

What a hassle to have custom rods made.
If I had one of these odd ball cranks, I'd sell it to someone else, perhaps a friend.

Young Skywalker, this is not the crank you want

Yoda says while waving his hand past your face

BURN-BROS · 10-23-2005, 09:44 AM

LOL!

Walt Fricke · 10-24-2005, 09:53 AM

I'd not previously seen mention of Porsche building a 9 bolt 66mm crank. Shows how there is always something a guy doesn't know. What race engines did Porsche build these cranks for?

Walt Fricke

Wayne 962 · Wayne 962's Garage

Henry, can you post the specs on the 962 crank? You mentioned that you had at least one at your shop (journals, etc.). This original post is a good eye-opener, I can't say I know what the journals are on the 66mm crank. I figured it was the same as the early cars, but now that I think about it, that doesn't make sense.

-Wayne

BURN-BROS · 10-24-2005, 04:27 PM

Here are some loose specs off of the one I picked up recently.

mains 60 mm dia.
rod journal 53mm dia and approx 24.25 mm wide

I always figured that the 66mm 9 bolts had the same journals as a 66mm 6 bolt. It would have made more sense since they had loads of race inventory from the 2.0/2.2.