Has anyone ever looked at replacing the stock damper with an
aftermarket piece which may be of better quality? It seems a bit scary
that we may be setting our timing up to 4 degrees off because the
dampers don't hold up well... (especially those of us who have high
compression heads and are worried about detonation)
Tim Holbrook
1971 TR6
--- "Robert M. Lang" <lang@isis.mit.edu> wrote:
> Date: Tue, 30 Apr 2002 09:58:53 -0400 (EDT)
> From: "Robert M. Lang" <lang@isis.mit.edu>
> To: Hugh Fader <hfader@usa.net>
> CC: "6 Pack List (E-mail)" <6pack@autox.team.net>,
> "Triumph Mailing List
> (E-mail)" <triumphs@autox.team.net>
> Subject: Re: TDC Location on Crank Pulley
> Reply-to: "Robert M. Lang" <lang@isis.mit.edu>
>
> On Mon, 29 Apr 2002, Hugh Fader wrote:
>
> > I have seen statments like "If you trust your TDC mark" on the
> lists. So, I
> > checked TDC on my crank pulley and discovered that it occurs when
> the
> > pointer is at 2 BTDC. I also see a slot cut into the mark at 4 deg
> ATDC. I
> > have a new crank. I assume that someone, maybe the factory,
> calibrated the
> > pulley to the old crank at 4 deg ATDC and that is what the slot is
> for.
> >
> > Anyone have insights on this?
> >
> > - Hugh
>
> The "tuners" like Kas Kastner indicate that the rubber in the
> harmonic
> dampener can move around a bit. This makes precise timing hard to do.
> To
> remedy the situation, they would take the dampener to the machine
> shop and
> drill a hole through the pully into the inner part of the dampener.
> Then
> when they watned to get precise timing, they would insert a pin to
> hold
> the two pieces in unison.
>
> FWIW, the flywheel generally has a mark for TDC. Set that (with a
> pointer,
> e.g. rotate clockwise to TDC, set the pointer then counterCW to TDC
> and
> set the pointer - it should line up with the verticle mark on the
> rear
> engine plate. Then put on your timing cover and "set the pointer"
>
> This way, at least you have exact TDC when you first fire the engine.
>
> I've had a couple of dampeners that were up to 4 degrees off (I just
> moved
> the pointer on the timing cover to accomodate this).
>
> Good luck.
> rml
>
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