Compression testing
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Tourer
Joined: Jul 2013
Posts: 389
Likes: 9
From: MT
Compression testing & Valve Train Noise
Weathers been crap & have only pulled 1 vtune session. Decided to compression test after swapping cames to the andrews 57 and going w/cometic .027hg.
My intial run on vtune showed just the front cylendar being lean. Valve train is quiet on start up but after warming up seems to pickup some noise. Also seems lounder in the 2500 rpm and up.
Warmed up the bike for about 5-8 minutes. (about 50deg outside)
Disconnected Coil
Pulled both spark plugs
Battery at full charge and on battery tender
Ran compression tests and pull ~120 on each front & rear cyl
turned it over 4-6 times, at which point it stops increasing.
Much lower that I expected ~180
Bike seems to run good, but 120, am I doing something wrong or possilble issues that just havent fully surfaced?
My intial run on vtune showed just the front cylendar being lean. Valve train is quiet on start up but after warming up seems to pickup some noise. Also seems lounder in the 2500 rpm and up.
Warmed up the bike for about 5-8 minutes. (about 50deg outside)
Disconnected Coil
Pulled both spark plugs
Battery at full charge and on battery tender
Ran compression tests and pull ~120 on each front & rear cyl
turned it over 4-6 times, at which point it stops increasing.
Much lower that I expected ~180
Bike seems to run good, but 120, am I doing something wrong or possilble issues that just havent fully surfaced?
Last edited by rgr357; Apr 8, 2015 at 09:58 PM.
Thread Starter
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Tourer
Joined: Jul 2013
Posts: 389
Likes: 9
From: MT
Yes pulled the AC and opened throttle 100% before hitting the starter.
Thread Starter
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Tourer
Joined: Jul 2013
Posts: 389
Likes: 9
From: MT
I did not disable the ACRs.... I presume to just pull the plug on them. Ill try it tomorrow and let you know, but that makes perfect sense, I just didnt think of it.
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Tourer
Joined: Jul 2013
Posts: 389
Likes: 9
From: MT
Was able to run through the entire process again this time pulling ACRs after warming up etc.
Measured 185psi on both front and back cyl!!!
A little higher that I thought it would be, Very pleased with results. Head volume or cyl deck hight must have been better than I thought. I'm at 2900 on an overcast day 55degs.
Thanks for helping point me in the right direction!
Measured 185psi on both front and back cyl!!!
A little higher that I thought it would be, Very pleased with results. Head volume or cyl deck hight must have been better than I thought. I'm at 2900 on an overcast day 55degs.
Thanks for helping point me in the right direction!
Last edited by rgr357; Apr 5, 2015 at 07:08 PM.
Road Master
Joined: Apr 2012
Posts: 1,096
Likes: 17
From: San Jose
Was able to run through the entire process again this time pulling ACRs after warming up etc.
Measured 185psi on both front and back cyl!!!
A little higher that I thought it would be, Very pleased with results. Head volume or cyl deck hight must have been better than I thought. I'm at 2900 on an overcast day 55degs.
Thanks for helping point me in the right direction!
Measured 185psi on both front and back cyl!!!
A little higher that I thought it would be, Very pleased with results. Head volume or cyl deck hight must have been better than I thought. I'm at 2900 on an overcast day 55degs.
Thanks for helping point me in the right direction!
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Tourer
Joined: Jul 2013
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From: MT
Valve Train Noise
Finally had a chance to go for another ride the other day.
Sounds great on inital startup but starts to get valve train noise as it approaches full temp. Seems like the hotter it gets the louder it is. Also not so bad at idle but around 2400 it ramps up, again not so much when its on warm up but certainly louder than it should be when hot.
Otherwise sounds and runs great... any indication of based on those symptoms?
oh yeah, I tried the screwdrive test but was hard to pin point other than somewhere under the rocker cover. Also seems louder on the left side of the bike and Im not just saying that cause the exhaust note/intake. Sound can do odd things tho so who knows.
Sounds great on inital startup but starts to get valve train noise as it approaches full temp. Seems like the hotter it gets the louder it is. Also not so bad at idle but around 2400 it ramps up, again not so much when its on warm up but certainly louder than it should be when hot.
Otherwise sounds and runs great... any indication of based on those symptoms?
oh yeah, I tried the screwdrive test but was hard to pin point other than somewhere under the rocker cover. Also seems louder on the left side of the bike and Im not just saying that cause the exhaust note/intake. Sound can do odd things tho so who knows.
Last edited by rgr357; Apr 8, 2015 at 09:57 PM.
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Joined: Mar 2013
Posts: 208
Likes: 8
From: Terlton, Ok
After a top end rebuild this last winter, I have been fighting with lifter noise when the bike heats up. I have adjusted the pushrods several times according to the S&S instructions, but couldn't quite get it right. My solution- and guys please feel free to correct me if what I did was wrong- was to adjust them hot. I rode the bike for a few miles to get it up to temperature, then put on a pair of leather gloves and adjusted the pushrods again. I tightened them up to where they had no play, but could just barely be turned with gloved fingers. The noise is now gone, and it seems to be running fine this way.
