Compression test values
Former Vendor
Joined: Feb 2005
Posts: 15,228
Likes: 2,529
From: Anaheim
Performed compression test again Sunday. Removed all spark plugs, engine temp around 120 degrees. Throttle wide open. Used Mighty vac digital compression tester:
#1 205
#2 211
#3 211
#4 212
#5 189
#6 145
#7 211
#8 211
So, #6 is 30% below the highest value. Stuck valve or worse?
#1 205
#2 211
#3 211
#4 212
#5 189
#6 145
#7 211
#8 211
So, #6 is 30% below the highest value. Stuck valve or worse?
I'm not much of an "additive" guy, but I do use a couple different chemicals that work, very well, for me. Buy some Ventil Saber by Lubro Moly (Valve Cleaner) and run this in the gas for a couple of tanks of fuel. Then retest compression.
Thread Starter
Rennlist Member
Joined: Oct 2006
Posts: 1,507
Likes: 126
From: Oakland, MI
Took some pics of cylinder # 6 with my usb boroscope tonight.
https://picasaweb.google.com/emantin...eat=directlink
Not the best pics but you can see the carbon on the top of the piston in the first 5 pictures. The next 7 show me trying to go up and down on the cylinder walls - do those little lines look like scoring of some sort? The next 5 are around the valves. The final 8 pictures are the top of the piston again towards the sides.
Based on the pictures, how does it look? Is it time to pull the heads or can I get by with some decarbonizing chemicals?
https://picasaweb.google.com/emantin...eat=directlink
Not the best pics but you can see the carbon on the top of the piston in the first 5 pictures. The next 7 show me trying to go up and down on the cylinder walls - do those little lines look like scoring of some sort? The next 5 are around the valves. The final 8 pictures are the top of the piston again towards the sides.
Based on the pictures, how does it look? Is it time to pull the heads or can I get by with some decarbonizing chemicals?
Last edited by EMan 928; May 1, 2013 at 07:38 PM. Reason: update
