Jw flywheel question

[jay dcpt]

I'm installing a jw flywheel on a eagle crank and 2 of the mounting holes are slightly off. I was just going to open them up a tad with a grinder. Anyone ever run into this? Just curious.

 

[Kip]

Been there done that. The crank is the problem.

 

[pacecarta]

bolt holes in buick cranks are not equal spaced purposely because the cranks are external balanced.
the reason for uneven spacing is so there's only one correct way to bolt it up ensuring that the heavy side and light side of flexlate goes where its supposed to
on a forge crank its typical to do internal balance and neutral flexplate , but the bolt pattern doesn't change
you should keep spinning until all holes line up, but on the odd chance someone screwed up a little if your setup is neutral then there's no issue opening hole a little if its off ..but it shouldnt be

what you need to be careful of with forged cranks is the radius edge on the output flange , because of the curved edge you need to radius (bevel cut) the inside edge of the flexplate to ensure it will mate flat to the crank flange .

 

[jay dcpt]

Appreciate the input. Engine is internally balanced. Tried spinning the flexplate in every possible position, it's not going to work without a little opening of 2 of the holes. Didn't see it being a big deal. Just thought I would ask first.

 

[jay dcpt]

Kip what did you do to correct the issue?

 

[jay dcpt]

Pacecar appreciate that your back posting again.

 

[Kip]

Kip what did you do to correct the issue?

Opened up the bolt holes a fuzz. Have also had to bevel the flexplates before as mentione above. These problems were on early overseas crankshafts.

 

[ek02]

I have a JW flywheel on a RPM stroker crank. No problems with installing it. All the holes lined up. Be sure it is on with the correct side facing front.

 

[jay dcpt]

Ok thanks for the help guys. I have another question with this situation. I'm putting a turbo 400 trans in this car witch I have never done with a turbo Buick before. Will the converter bolt right up to the flywheel? I don't have the converter yet. Just installing the trans for Mock up so I can build the headers.

 

[jay dcpt]

I have a JW flywheel on a RPM stroker crank. No problems with installing it. All the holes lined up. Be sure it is on with the correct side facing front.

I'll double check that. I just held it up to the crank with the sfi sticker facing out.

 

[jay dcpt]

I'm going to put a bolt together converter in it so I'm sure my converter guy can make it work. Was just curious if I need to specify anything.

 

[jay dcpt]

Yeah so I was a dumb ass. I was holding it up to the crank backwards. Flipped it around and it fit perfectly. Thanks for the help.

 

[TireFryer]

Yeah so I was a dumb ass. I was holding it up to the crank backwards. Flipped it around and it fit perfectly. Thanks for the help.

We’ve all done something like that

 

[ek02]

The JW flywheel has multiple holes for most converters to bolt to. Mine has small radius and large radius bolt holes.