Engine Specific Info and Questions > IDI Engine

Piston height. What would you do?

(1/3) > >>

fatmobile:
The #1 piston is .021".
  #2 is .019"
 #3  is .017"
 The 4th is .011".
 Those are under a 1 notch gasket (.0264-.0315)  some by quite a bit.
 and  there is only 4 or 5 thou between notches.
 The surface isn't great but would probably stick with a little hylomar.
 I'd like to get the block surfaced.

 Should I have them take 10 thou more off one end?
 Something like
  .021  + .002  = 23
  .019  + .0053  =  .0243
  .017  + .0086  = .0256
  .011  + .012  = .023

It would still use a 1 notch but compression would be better and all cylinders would be closer.

libbydiesel:
Have you tried swapping rods from one piston to another to see if you can even them out any? 

fatmobile:
Yeah, 3 and 1 got swapped.
 Didn't change much, except make them all graduate from one side to the other.
 Instead of high in the middle.

libbydiesel:
I think your idea of shaving more off one side that the other has merit if the machine shop will do it.

fatmobile:
I read your question wrong.
 I didn't swap rods I moved pistons to different holes.

 Actually swapping 1 and three showed 3 was .023 and became .021 in hole 1.  Went down 2.

 1 went from .016 to .0175 in hole 3.  Went up 2ish.
 So it seems like the block has a slight lean now.
 
I've had this done on another block. Only once.

 The pistons are out of the old VNT-15 Rabbit block that cracked on my trip last fall.
It always had something different about how one cylinder sounded.
  Maybe this was it. I don't think I wrote down the piston height numbers like I did this time,..
just took the highest piston and picked a gasket.

Sounds like it's easy for the shop to do it,. $40.

Navigation

[0] Message Index

[#] Next page