Bob, was the clutch assy. balanced with the flywheel? Just a thought.
Tom
----- Original Message -----
From: <bob@texmog.com>
To: <Triumphs@autox.team.net>
Sent: Thursday, April 09, 2009 12:07 AM
Subject: [TR] Vibration in TR 3 Engine
> Okay, I finally got the engine rebuild from hell in the car and, yes
> another
> problem.
> First the background. New AE pistons and liners (87 mm), all new bearings
> (10 over), cam checked out as okay and lifters reground, All new valves
> and
> guides, new timing chain. All internal moving parts including the flywheel
> were balanced by a local race engine builder, the main bearing journals
> were
> line bored. The distributor was totally rebuilt as were the carbs.
>
> Started the engine up and ran it per instructions of the cam company to
> seat
> the lifters. Engine ran smooth and idles beautifully.
> On driving the car the engine is again very smooth and has plenty of
> power.
> The problem is that as it approaches 2800 RPM a vibration starts, peaking
> at
> about 3000 RPM and fades out at 3500 RPM. The vibration is bad enough to
> cause the body panels to all start ringing. At first I thought it was the
> drive shaft but you can get the vibration even if the car is not moving
> although it is not as bad.
> After having the carbs and distributor rebuilt I installed them in my
> other
> car and tuned the carbs so has to have then at least close on start up of
> the new engine and there was no vibration it that engine.
>
> I'm not looking forward to tearing the engine down especially since I
> have
> no idea where to even start looking for the problem.
> Any suggestions as where to start looking for the cause of the vibration?
>
> Bob
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