fastblackracing
Well-Known Member
- Joined
- Apr 7, 2009
- Messages
- 1,022
It is very easy to measure the stroke while the crank is in the block.
use the depth probe on your calipers...bring the piston to TDC slowly watching the up and down movent of the piston and after a couple of back and forth rotations you will be able to determine TDC within 2 or 3 degrees of rotation.
measure the piston down from deck distance with the calipers. write the number down.
Now do the same with the piston at the bottom of the stroke....again measure this distance and right it down.
Subtract the little number from the big one and this is your stroke, within .010 allowing for errors.
Doing this with a careful touch you can get very close measurements.....If you have good eyes you could also use a machinist ruler to measure this and get the dimension.
I can get TDC established on the engine stand within 2 degrees doing this.....verified with the dial indicator/degree wheel so yes it can be done.
The difference in a 3.625 crank will be .225" almost a quarter of an inch.
And I agree the whole assembly needs taken apart.....likely you will find other issues in there.
use the depth probe on your calipers...bring the piston to TDC slowly watching the up and down movent of the piston and after a couple of back and forth rotations you will be able to determine TDC within 2 or 3 degrees of rotation.
measure the piston down from deck distance with the calipers. write the number down.
Now do the same with the piston at the bottom of the stroke....again measure this distance and right it down.
Subtract the little number from the big one and this is your stroke, within .010 allowing for errors.
Doing this with a careful touch you can get very close measurements.....If you have good eyes you could also use a machinist ruler to measure this and get the dimension.
I can get TDC established on the engine stand within 2 degrees doing this.....verified with the dial indicator/degree wheel so yes it can be done.
The difference in a 3.625 crank will be .225" almost a quarter of an inch.
And I agree the whole assembly needs taken apart.....likely you will find other issues in there.