Triumph Sports Cars

engine swaps and other performance upgrades, plus "factory" V8s (Stag and TR8)

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My TR6
Joe Marrone

(5 posts)

Registered:
11/16/2019 08:30AM

Main British Car:
Vibration at. “2000 rpm in neutral or moving
Posted by: My TR6
Date: November 16, 2019 10:25PM

I have a 1973 TR six with a 1962 Oldsmobile aluminum V-8
Does Anyone have an idea what it might be,I am leaning towards the fly wheel might not be balanced
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8D165863-F340-4427-A045-2DB659A370F2.jpeg


I Had the engine rebuilt, car runs GREAT. Not only was the Harmonic Balancer out of balance , the Flywheel was out of balance by almost an ounce.
My engine builder balanced everything before it went back together



Edited 1 time(s). Last edit at 03/24/2021 02:44PM by My TR6.


88v8
Ivor Duarte
Gloucestershire UK
(1041 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: Vibration at. “2000 rpm in neutral or moving
Posted by: 88v8
Date: November 17, 2019 04:52AM

Hello and welcome.

Is this a new problem?

Is it actually a vibration you can feel, or just a noise?

When the engine is running, with a stethoscope or a long screwdriver, can you determine whether it's at the back of the engine or the front?

Auto or manual?

Ivor


My TR6
Joe Marrone

(5 posts)

Registered:
11/16/2019 08:30AM

Main British Car:
Re: Vibration at. “2000 rpm in neutral or moving
Posted by: My TR6
Date: November 17, 2019 07:35AM

I had my mechanic look at it, we found the driveshaft was loose and tightened it and he drove it some more and we still had an engine vibration, he pulled over left it in neutral, it has a five speed mustang transmission and in neutral it still had that vibration
I recently purchased a car and talked to the gentleman that built it and he said he put. In a new fly wheel but he did not check to see if it was balanced
I am stumped All the engine parts come from D & D Fabrication in Michigan
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88v8
Ivor Duarte
Gloucestershire UK
(1041 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: Vibration at. “2000 rpm in neutral or moving
Posted by: 88v8
Date: November 18, 2019 04:52AM

So you can feel it, not just hear it.

Some things I'd look at:

Soft engine or trans mounts, especially if oil is leaking onto them.
Exhaust hitting against something.
Exhaust resonance.
Engine firing order wrong.
Not firing on one cylinder.
Harmonic damper (front pulley) loose.
Flywheel loose.
Clutch cover loose.
Or pretty much anything loose that has a vibration frequency which equates to 2000rpm.

Vibrations and resonance can be a right pain.

Ivor


MGBV8
Carl Floyd
Kingsport, TN
(4512 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Vibration at. “2000 rpm in neutral or moving
Posted by: MGBV8
Date: November 21, 2019 09:56AM

The flywheel should be good to go as purchased. The engine is internally balanced. Though, if not torqued properly...

If you are using an original harmonic balancer/damper, it is very old. Check the condition of the elastomer.

[fluidampr.com]


88v8
Ivor Duarte
Gloucestershire UK
(1041 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: Vibration at. “2000 rpm in neutral or moving
Posted by: 88v8
Date: November 22, 2019 04:01AM

Quote:
"MGBV8"
If you are using an original harmonic balancer/damper, it is very old. Check the condition of the elastomer.

Yes, one thinks of them as permanent, but eventually the elastic centre debonds and impairs the damping.
That happened with my TR6, detected when it became apparent that the timing marks were out. Didn't cause a vibration in my case, but it could.

Ivor


billymgb1000
bill gaulin
harrisville R.I.
(74 posts)

Registered:
11/30/2012 12:31AM

Main British Car:
1974 MGB V8 LS1 5.3

Re: Vibration at. “2000 rpm in neutral or moving
Posted by: billymgb1000
Date: December 08, 2019 04:45PM

I don't know what you have done so far in your trouble shooting but I would start with unhooking the fan belts. Just to eliminate the easy stuff first. I had a vibration a while back like yours, it was there going down the road or just sitting there. Turned out the alternator was the problem. Just a thought. Good luck brother
Bill G



My TR6
Joe Marrone

(5 posts)

Registered:
11/16/2019 08:30AM

Main British Car:
Re: Vibration at. “2000 rpm in neutral or moving
Posted by: My TR6
Date: March 24, 2021 02:56PM

I had the engine rebuilt, Had bad harmonic balancer, flywheel was out.
the engine builder did a great job.
5000 rpm's in second gear what a fun car to drive.
after all this I think I might sell it.


88v8
Ivor Duarte
Gloucestershire UK
(1041 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: Vibration at. “2000 rpm in neutral or moving
Posted by: 88v8
Date: March 26, 2021 05:17AM

Thankyou for coming back to let us know.

Hope you find a good home for the car.

Ivor


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