measuring "out of hole"/quench
#1
measuring "out of hole"/quench
What is the proper way to measure out of hole? Pistons flat at TDC, measure at top of block or Piston at TDC and "rocked" ?
Engine has
Eagle 6.125 Rods
Mahle -4 pistons
out of hole is .018 flat
out of hole rocked is .033
measured with a feeler gauge, will be getting dial indicator today and will measure with that.
Engine has
Eagle 6.125 Rods
Mahle -4 pistons
out of hole is .018 flat
out of hole rocked is .033
measured with a feeler gauge, will be getting dial indicator today and will measure with that.
#3
Moderator
iTrader: (20)
You rock them at TDC using the deck bridge shown above^^^^
Zero out on the deck, then put the indicator tip at the edge of the piston (thrust side). Rock the piston, measuring up and down positions. The average is your in/out measurment. Repeat on the opposite side of the piston.
Zero out on the deck, then put the indicator tip at the edge of the piston (thrust side). Rock the piston, measuring up and down positions. The average is your in/out measurment. Repeat on the opposite side of the piston.
#7
Moderator
iTrader: (20)
GM gaskets are usually .051" thick, so .018" would leave you with .033". That is pretty damn close and really doesn't leave much of a margin of safety. Personally, I wouldn't run that unless I had good reason to know it would clear.
Trending Topics
#8
TECH Fanatic
iTrader: (26)
Use the largest measurement out of the hole. If the thrust side measures .016" out and the opposite measures .018" out, go by the .018" since it's closest to the cylinder head. Subtract your "out of the hole" measurement from the head gasket thickness, and thats your quench distance.
GM gaskets are usually .051" thick, so .018" would leave you with .033". That is pretty damn close and really doesn't leave much of a margin of safety. Personally, I wouldn't run that unless I had good reason to know it would clear.
GM gaskets are usually .051" thick, so .018" would leave you with .033". That is pretty damn close and really doesn't leave much of a margin of safety. Personally, I wouldn't run that unless I had good reason to know it would clear.
#12
10 Second Club
Join Date: Nov 2002
Location: Berkeley, California
Posts: 1,471
Likes: 0
Received 3 Likes
on
3 Posts
Measuring deck clearance with flat-top pistons is easy. Locate TDC using a dial indicator near piston center. Then place a straight edge across the center of the piston parallel to the wrist pin and measure deck clearance with a feeler gauge. The tricky methods are only needed with domed pistons.
#13
anyways, problem solved build going forward.
and wheres my dam hood hinges? Ima be needin em soon