109 crankshaft questions

[opeltwinturbo]

1. What, if any, is the difference between an 86-87 turbo crankshaft and a 4.1 carb crank?

2. What is the maximum amount that can be ground off the mains or rod journals and still have a warm, fuzzy feeling?

3. Has anyone run different size bearings on the rod journals - example = #1 @ 10, #2 @ 20, etc.

 

[sixgun86gn]

#1 no difference.

#2 .020/.020 probably should be max,I have seen .030/.030 cranks take some abuse pretty good.

#3 don't know about that one.

 

[ijames]

#1 I think some of the 4.1's had a smaller balancer bolt size but the important thing is that they got the rolled fillets on mains and rods.

#2 Call Billy Anderson - he seems to be the most willing to push the envelope here with good results. From his old postings 20/20 is fine.

 

[Turbo1dr]

My crank is .020 .020 and I still have that warm and fuzzy feeling...

 

[fc227]

1. What, if any, is the difference between an 86-87 turbo crankshaft and a 4.1 carb crank?

2. What is the maximum amount that can be ground off the mains or rod journals and still have a warm, fuzzy feeling?

3. Has anyone run different size bearings on the rod journals - example = #1 @ 10, #2 @ 20, etc.

Yes, On my car #5 is .010 under and the rest are normal.

 

[S2V6RACER]

Call Otto.

 

[opeltwinturbo]

Call Otto.

Yea. Like he'd run right down here to fix it with a new crankshaft. First stop would be Rome's!