Twin Cam Warm idle Knock
Thread Starter
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Novice
Joined: Jul 2019
Posts: 16
Likes: 1
From: Richfield Springs, NY
Cold start 40lbs should be normal pressure. Prob 65F and garage kept (like mine lol)
Your raise to 60 to me means the oil is still cold. Again, mine will do that unless I let it idle too long.
Your 55lbs at cruise is pretty high. Looking like a high pressure pump in there.
Hot idle at 18 is a huge drop from 55. Im guessing its a liquid filled gauge and the liquid is now pretty warm. (been there done that one).
Your raise to 60 to me means the oil is still cold. Again, mine will do that unless I let it idle too long.
Your 55lbs at cruise is pretty high. Looking like a high pressure pump in there.
Hot idle at 18 is a huge drop from 55. Im guessing its a liquid filled gauge and the liquid is now pretty warm. (been there done that one).
Listening to your videos again it sounds like its up top to me.
I think I can hear it in the cold engine too at the end where you're on the left side.
Noise transmits through metal making it hard to find it.
Its noisy the whole valve train in these speakers.
Nice looking bike.
I think I can hear it in the cold engine too at the end where you're on the left side.
Noise transmits through metal making it hard to find it.
Its noisy the whole valve train in these speakers.
Nice looking bike.
The noise is definitely coming from the cam chest near the rear lifters. I used a mechanic's stethoscope and it was painfully obvious.
The plugs look good nice dry grey color.
I should also mention that I have the high flow SE oil pump that came with the upgrade kit and an oil cooler on the bike.
Last edited by Rev. Rev.; Sep 24, 2019 at 08:40 AM.
Thread Starter
|
Novice
Joined: Jul 2019
Posts: 16
Likes: 1
From: Richfield Springs, NY
Garage results:
Cold Start 40psi - after 2 minutes of idle I twisted the throttle and the raised it to a steady 60psi
Ride Results:
Steady cruising - 52-55psi
Hot idle: 18psi
Seasoned HDF Member
Joined: Mar 2010
Posts: 38,614
Likes: 6,440
From: Honah Lee
Think it's just the way someone engineered your cam and relief plate. To some it looks good. As long as you do not cook the oil at a stoplight, not going to hurt anything. My guess spring is so strong, it's not releasing. That is just the the varing volume of oil put out from idle up thru higher rpm. The pressure of course increase from the resistance as it is driven thru plumbing to points of lubrication needs.
Road Master
Joined: Aug 2019
Posts: 786
Likes: 177
From: wv
Somewhere I heard that older TC the outer cam bearings pressed onto the cams, where newer TC they press into the cam plate. You had the cam plate replaced but not the cams? Just the lifters and pushrods? I know I don't know what I'm talking about but its just a thought but if that is true then is the sizes the same? idn
And back to my question about the valve springs may be weak. New lifters on weak springs I guess could start tapping. idn. I'd go into the cam chest if it were me now but first I'd want a compression test and hopefully a leak down test. If the springs are weak maybe the leak down test might show it.
And back to my question about the valve springs may be weak. New lifters on weak springs I guess could start tapping. idn. I'd go into the cam chest if it were me now but first I'd want a compression test and hopefully a leak down test. If the springs are weak maybe the leak down test might show it.
HDF Community Team
Joined: Jun 2006
Posts: 12,776
Likes: 2,607
From: san antonio
Somewhere I heard that older TC the outer cam bearings pressed onto the cams, where newer TC they press into the cam plate. You had the cam plate replaced but not the cams? Just the lifters and pushrods? I know I don't know what I'm talking about but its just a thought but if that is true then is the sizes the same? idn
And back to my question about the valve springs may be weak. New lifters on weak springs I guess could start tapping. idn. I'd go into the cam chest if it were me now but first I'd want a compression test and hopefully a leak down test. If the springs are weak maybe the leak down test might show it.
And back to my question about the valve springs may be weak. New lifters on weak springs I guess could start tapping. idn. I'd go into the cam chest if it were me now but first I'd want a compression test and hopefully a leak down test. If the springs are weak maybe the leak down test might show it.
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Stellar HDF Member
Joined: May 2015
Posts: 2,099
Likes: 307
From: mid Michigan
Im thinking that that worn off push rod is stuck in the rocker and not letting oil pass threw. On a bike that old just don't understand not sticking with stock pushrods so the top can be looked at going threw the top anyway.
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HDF Community Team
Joined: Jun 2006
Posts: 12,776
Likes: 2,607
From: san antonio
The OP has been advised on more than one occasion to pull the rocker covers to observe oil flow to the top end which, if it had been done, would confirm, or not, your suggestion that the worn push rod is not allowing oil to pass through. I don't share your concern but, like I said, easy to check.