Vibration problems
Thread Starter
Pro
Joined: Dec 2006
Posts: 570
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From: Colleyville TX
St. Jude Donor '09
Vibration problems
Well I have installed a 383 stroker in my 64. Its definitely not the Sunday cruiser it was with the base 250 ph. The stroker is suppose to be very well balanced. It sure seams to have to much vibration to me. I'm no expert on how much is to much. Does anyone know how this can be checked. Or where I could take it in the Dallas, TX area.
Team Owner
Joined: Mar 2003
Posts: 26,118
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From: Greenville, Indiana
The damnper may be your problem. I don't know anything about the one you used. Your engine should not vibrate at all assuming it was balanced properly (clutch too).
Is the vibration a shake or more of a buzz? What rpm brings it on? In gear, out? Road speed?
I don't know how knowledgable you are so I'll ask if you're not confusing the expected rough idle of a hot rod aftermarket cam with a vibration?
Need some more info.
Is the vibration a shake or more of a buzz? What rpm brings it on? In gear, out? Road speed?
I don't know how knowledgable you are so I'll ask if you're not confusing the expected rough idle of a hot rod aftermarket cam with a vibration?
Need some more info.
Racer
Joined: Jun 2006
Posts: 309
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Small diameter balancers seem to have this problem on the 3 3/4 and longer stroke stuff. Verify that it's actually a harmonic (it'll do it in neutral) and if it is go buy yourself an eight inch fluidamper.
Team Owner
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From: Washington Michigan
Thread Starter
Pro
Joined: Dec 2006
Posts: 570
Likes: 7
From: Colleyville TX
St. Jude Donor '09
The damnper may be your problem. I don't know anything about the one you used. Your engine should not vibrate at all assuming it was balanced properly (clutch too).
Is the vibration a shake or more of a buzz? What rpm brings it on? In gear, out? Road speed?
I don't know how knowledgeable you are so I'll ask if you're not confusing the expected rough idle of a hot rod aftermarket cam with a vibration?
Need some more info.
Is the vibration a shake or more of a buzz? What rpm brings it on? In gear, out? Road speed?
I don't know how knowledgeable you are so I'll ask if you're not confusing the expected rough idle of a hot rod aftermarket cam with a vibration?
Need some more info.
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Thread Starter
Pro
Joined: Dec 2006
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From: Colleyville TX
St. Jude Donor '09
Team Owner
Joined: Mar 2003
Posts: 26,118
Likes: 1,874
From: Greenville, Indiana
I don't think the small harmonic balancer would cause that unless it was for an internal balanced engine. Your shake sounds like it is the wrong (internal balance) flywheel.
How did it run in the car it came out of? There is the possibility here that the engine has been balanced internally and you used external balanced balancer and flywheel.
Last edited by MikeM; Feb 6, 2007 at 01:40 PM.
Burning Brakes
Joined: Oct 2006
Posts: 797
Likes: 11
To check the balancer get under the car and look at it from the back side if it has a depression 3/4 around or a plate bolted on it's the right one. If theres a even pocket all the way around with no weight it's not right for your engine.
Thread Starter
Pro
Joined: Dec 2006
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From: Colleyville TX
St. Jude Donor '09
I don't no if it will help but here is the info on the motor
http://forums.corvetteforum.com/show...errerid=238445
http://forums.corvetteforum.com/show...errerid=238445
Team Owner
Joined: Mar 2003
Posts: 26,118
Likes: 1,874
From: Greenville, Indiana
I don't no if it will help but here is the info on the motor
http://forums.corvetteforum.com/show...errerid=238445
http://forums.corvetteforum.com/show...errerid=238445
After reading the ad and looking at the engine, I highly suspect what I suspected first: a combination of poly motor mounts and the camshaft that's in the engine. Not enough vacuum to shut the headlights??????
Does it smooth out the faster you run it?
Have you contacted the seller with your concerns or are you waiting for external opinions before you do?
Thread Starter
Pro
Joined: Dec 2006
Posts: 570
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From: Colleyville TX
St. Jude Donor '09
After reading the ad and looking at the engine, I highly suspect what I suspected first: a combination of poly motor mounts and the camshaft that's in the engine. Not enough vacuum to shut the headlights??????
Does it smooth out the faster you run it?
Have you contacted the seller with your concerns or are you waiting for external opinions before you do?
Does it smooth out the faster you run it?
Have you contacted the seller with your concerns or are you waiting for external opinions before you do?
I do have a problem with crank case pressure it wants to push oil out anywhere it can. (low vacuum)
It seems to smooth out at faster speeds.
Contacting the seller at this point wouldn't do much good. He has been very helpful but I bought the motor as is.
Team Owner
Joined: Mar 2003
Posts: 26,118
Likes: 1,874
From: Greenville, Indiana
"Contacting the seller at this point wouldn't do much good. He has been very helpful but I bought the motor as is."
The seller could tell you if the engine had a vibration.
I see a breather in each valve cover vented to atmosphere. Is that what you have? Guaranteed to blow oil out. Get a vacuum hookup on one valve cover and pull air from the other side or some means of controlling the crankcase pressure.
I don't know what effect gapless rings have on blowby. Maybe one of the racers knows.
To answer your question, I cannot recommend anyone in Dallas. Too far away. I'd think if you showed up at a cruise in your neighborhood or anywhere there's a gathering of car guys, you'd likely run across someone who could help you first hand.
The seller could tell you if the engine had a vibration.
I see a breather in each valve cover vented to atmosphere. Is that what you have? Guaranteed to blow oil out. Get a vacuum hookup on one valve cover and pull air from the other side or some means of controlling the crankcase pressure.
I don't know what effect gapless rings have on blowby. Maybe one of the racers knows.
To answer your question, I cannot recommend anyone in Dallas. Too far away. I'd think if you showed up at a cruise in your neighborhood or anywhere there's a gathering of car guys, you'd likely run across someone who could help you first hand.
Last edited by MikeM; Feb 6, 2007 at 04:52 PM.
Team Owner
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From: Greenville, Indiana
Le Mans Master
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From: "cutesy" TN
Thread Starter
Pro
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From: Colleyville TX
St. Jude Donor '09
Team Owner
Joined: Mar 2003
Posts: 26,118
Likes: 1,874
From: Greenville, Indiana
You won't know what to check if you don't know what cam is in it. Lunati can verify for you. Another short way to check is look at the plugs and see if any of them are fouled and expecially #'s 4 and 7.