Early crank in 3.0 Case?

[HawgRyder]

OK...I know.....I'm certifiable...but...
Will an early crank...66mm... fit into a 3.0 case?
I have been reading the posts and the early 3.0 seems to have different numbers than the late ones.
It may be easier (cheaper?) to find a 3.0 aluminum case than an early aluminum one.
Then I could go as big as I wanted on the bore size...I know...I need different heads...but it sounds doable.
Bob

[jluetjen]

Hi Bob;
I think that you'll need a Carrera 3.0 case like Wayne is using for his engine project. That has the journal sizes to fit the early cranks, but the cylinder stud pattern to fit the larger 3.0 cylinders.

[HawgRyder]

What years am I looking for?
Bob

[Bill Verburg]

The only 930 case that has the smaller journals as used in the 2.7 is the '76 and '77 C3 and -'77 930. The C3 used the older clockwise distributor rotation, the 930 used the newer(as used in SC/Carrera) counterclockwise dist. rotation(i.e. lay shafts are different)

[Wayne 962]

Right - the 1976-77 Turbo and European Carrera case is the only one that can accept the early cranks. Costs are about $1500-$2000 for the cases...

-Wayne

[ChrisBennet]

Originally posted by Bill Verburg
The only 930 case that has the smaller journals as used in the 2.7 is the '76 and '77 C3 and -'77 930. The C3 used the older clockwise distributor rotation, the 930 used the newer(as used in SC/Carrera) counterclockwise dist. rotation(i.e. lay shafts are different)

Not to be too picky but the Carrera distributor rotates clockwise. It's just the SC (and those SCWDP guys) that "turn the other way" - not that there is anything wrong with that.
-Chris

[Bill Verburg]

I knew I should have looked that up

[john walker's workshop]

it's not the layshaft, but the brass dist drive gear on the crank, which can be swapped to use a distributor that turns in the direction you want, depending on application.

[dtw]

Chris,
Great point on the crank/distributor issue and you're NOT being picky. I had some good friends complete a custom race motor based on an SC crank just in time for a race weekend. Since the prior season they upped their displacement and moved to an RSR distributor. The weekend before the big race, they went to finish the motor...the RSR distributor, of course, did not fit. The entire engine had to be pulled apart to swap out the crank gear, as the distributor cannot simply be modified (advance mechanism only works in one direction).

Any time you are considering hybrid engines, go over your ideas with an experienced shop, part by part, to make sure everything is compatible. Consider a trial assembly, too. You DON'T want the sinking feeling my friends had...

[Bill Verburg]

Yep, John, I should have revisited that as well. I remembered some sort of lay shaft change around that time and merged the thoughts.

[HawgRyder]

If the cases are worth that much money...I believe I will stay with the mag case I have and just do a complete rebiuld on it, unless I come up with a 2.0 aluminum case for reasonable dollars.
Thanks for the input guys.
Bob

[MotoSook]

While working on Chris' 3.2 short stroke with the 930/02 case, I found myself wondering if a 2.7 crank could be used with oversized bearings in an SC case. I haven't had much time since to look deeper into it, but maybe you guys can tell me if I had one to many beers during my college days.

[HawgRyder]

In the old days....geez time flies.....we used a type of shim (looked like a bearing but was designed to go behind the actual bearing to hold it) on some old 6 cylinders.
I believe they were sold because no one made the size bearings we needed or the crank had been turned down to the next size (like using chrysler hemi rods in a chevy engine).
In any case...why not find a bearing that would fit a bored out case with the correct inner and outer numbers?
Which brings up a question...does Clevite (Michigan77) make bearings for P-cars?
I have always liked Clevite for their longevity...steel backed/copper/alum type.
Bob