low power, engine miss
Thread Starter
Instructor
Joined: May 2009
Posts: 180
Likes: 1
From: Prairieville Louisiana
low power, engine miss
I ran a vacuum test. engine had 17 in. vacuum with a 1 in. swing every 30 seconds or so. Had 50 to 35 lbs. cranking compression on all cylinders. I put a couple shots of oil in one cylinder and it made no difference. I am thinking valves not seating?? Input please!
Melting Slicks
Joined: Jul 2006
Posts: 2,291
Likes: 492
From: Salmon Arm, BC
Here is a good link to help understand what your vacuum gauge is telling you.
http://www.gregsengine.com/vacuum.htm
http://www.gregsengine.com/vacuum.htm
Melting Slicks
Joined: Jul 2006
Posts: 2,291
Likes: 492
From: Salmon Arm, BC
You need to rig up something to allow you to pump shop air into a cylinder through the plug hole. Next listen at the carb, then the exhaust, and then at the oil fill hole in the valvecover. When you find the noisy area thats whereyou look.
Carb= intake valve or adjustment
Exhaust= Exhaust valve or adjustment
Valvecover= Rings or pistons
Hope this helps
Carb= intake valve or adjustment
Exhaust= Exhaust valve or adjustment
Valvecover= Rings or pistons
Hope this helps
