Pretty sure it's the compression release??
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Road Master
Joined: Apr 2009
Posts: 1,205
Likes: 3
From: Mebane, NC
Pretty sure it's the compression release??
I have been noticing a noise for a while and have bneen chasing it. Sounds kind of like a chirp or whistling sound. At first I thought maybe an exhaust leak but no I'm pretty sure it's coming from a compression release. It's most noticable in 3rd gear around 1800 rpm when I roll on it. Anybody got any ideas?
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Road Master
Joined: Apr 2009
Posts: 1,205
Likes: 3
From: Mebane, NC
It doesn't do it at start up (if that's what you mean?). I notice it initially on moderate to hard acceleration when going from around 2000 rpm. If I hit it at a higher rpm it isn't noticable. At least I can't hear it?
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Road Master
Joined: Apr 2009
Posts: 1,205
Likes: 3
From: Mebane, NC
Another thing I have noticed is a small hesitation or flat spot when bliping the throttle. Most often notice this when coming to a stop and the starting again. With the 10:5-1 compresiion I give a little throttle to keep it form stallling out...plus it just sounds good. 
If the compression release is sticking would this or could this be a symptom?
If the compression release is sticking would this or could this be a symptom?
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Road Master
Joined: Apr 2009
Posts: 1,205
Likes: 3
From: Mebane, NC
I'll bite...What's that going to tell me?
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Seasoned HDF Member
Joined: Mar 2010
Posts: 38,687
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From: Honah Lee
Talcum acts like a lubricant. It will only last a short while. Just isolating that its not belt noise. Try it some day on an older car with older drive belts making a lot of noise. It will quite right down if its just the belts and not a bearing like the alternator or water pump. My drive belt makes a raspy snappy sound at a certain speed in 3rd gear
Last edited by Jackie Paper; Jun 4, 2011 at 12:04 AM.
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1st Gear
Joined: Jan 2014
Posts: 5
Likes: 0
From: League City, Texas
CR's whistling
What did you ever find out about this issue. Mine now does this, though at a bit higher rpm, but it is always when accelerating under load. Nothing at idle or when cruising at a static speed & rpm. Didn't seem to happen until I had the manual CR's installed. They sometimes stick at start-up, but a blip of the throttle usually closes them up.
Thanks!
Thanks!
Outstanding HDF Member
Joined: Oct 2011
Posts: 3,492
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From: Illinois
I am not an ace mechanic but if it is leaking compression I don't think it would run well at all, if any! I can't think of the name of it but they sell leak detection spray, it will bubble if there is a leak but then if there is a leak I wouldn't want to spray anything on there and have it leak down into the heads. Just my $0.02 for what it's worth.