[Fot] TR6 Harmonic Dampener

[Mike Harmuth]

Bob, would raising the front of the engine up help with the clearance? I
have 4 alignment shims (roughly 1/4") under the motor mounts on my spit to
give me clearance for the larger diameter header. Quick, cheap and still
technically all Triumph.

mike h

On Wed, Sep 24, 2025 at 9:11 AM Robert Lang via Fot <fot at autox.team.net>
wrote:

> Hi,
>
> After I got my frame straightened last year, I've noticed that the
> clearance between the ATI harmonic dampener and the front cross member and
> the steering rack seems tighter than what I previously had. Granted how
> much metal had been bent in the crash, I'm not surprised.
>
> So, I have a question for the hive - to compensate, I plan to push the
> engine back a tad, maybe 1/4" or so using the "usual method" of installing
> a metal plate in the engine mount to frame interface. The question: in
> moving the engine back in small increments, will I have to "shorten" the
> driveshaft or is the driveshaft length (stock driveshaft and stock 4-speed
> TR6 transmission) already able to compensate for moving the engine back.
>
> I'm not planning to go wild and make the car "mid-engined". I'm just
> looking to compensate for some "rearranged metal" in the front of the car.
> That and I also had to switch back to "stock" rubber motor mounts as
> opposed to the HD units that TRF used to sell. Else, if there's a source
> for stiffer stock-type TR6 engine mounts, I'm all ears. The softer stock
> units allow a LOT of motion in both axis of motion.
>
> After two broken cranks this season and reviewing my in-car vids, it looks
> like I'm not abusing the self-imposed redline of 6000 except occasional
> hell-toe blips on downshifts (Hi Christian!!) that I need to smooth out.
> But I think the crank is hitting the frame while spinning and that's adding
> more stress to the snout of the crank.
>
> TIA
>
> Bob Lang
> 339 927 4489
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