The TR3-4 engine is a maker of really really heavy vibration at about 5200
revs. In the engine dyno you cannot keep the carb bell in your hand the
vibration is so severe at that rev. The gas in the bowl at that time is
almost all foam. Amazing that engine runs at all there. "O" ringing the
insulater blocks really helps a bunch.
> From: RKramer@rdoequipment.com
> To: fot@autox.team.net
> Date: Thu, 26 May 2011 07:58:23 -0500
> Subject: Re: [Fot] Sputtering TR question
>
> With HS6's I haven't had a fuel foaming issue, but with my previous TR4,
with
> H6's I struggled with them as Tony describes. I did three things and solved
> the problem. First I tried safety wire to secure the float bowls from
shaking
> so much, with limited improvement. Second I had been advised that it was
best
> to weld up the tranny mount into a solid mount to avoid failures , but I
> determined that this added to the resonance issues. I now fill the cavity
of
> a stock mount with silicone, gradually so it cures. This is the "Air
Triumph"
> mount. Lastly I placed 2" o-rings between the insulator block and the
intake
> manifold surface (or was it the carb surface?). I used a 2" hole saw to cut
a
> locating groove in the insulator and slightly longer studs to mnount the
> carbs. Worked for me.
>
> Bob Kramer
>
> -----Original Message-----
> From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf
> Of Tony Drews
> Sent: Thursday, May 26, 2011 12:40 AM
> To: Duncan Charlton; fot@autox.team.net
> Subject: Re: [Fot] Sputtering TR question
>
> I doubt this is the issue, but one issue that Jack had was a little
> piece of rubber from where the jet tube comes into the float bowl -
> it allowed enough fuel to get through that it ran but would
> occasionally block the jet causing the car to run like crap. Took
> over 5 carb disassemblies before it was found. Different symptoms to
> what you are having, though.
>
> If you have a fuel pressure gauge and EGT gauge (front and rear), you
> can tell whether it's going rich or lean.
>
> We fought issues with fuel pressure regulators (goes lean at end of
> long straight - pulling back on the gas pedal helps) and with
> vibration causing the fuel in the carb bowl to foam (goes rich -
> nothing you do with the gas pedal helps much), as well as the
> orientation of the top of the float bowl (one goes rich - keep the
> revs way up and the problem lessens as you clear the extra fuel more
> quickly).
>
> With the resonance deal foaming the fuel, it seemed that once it got
> started it would continue but if you could eke through the RPM that
> caused the issue the resonance would stop. It wouldn't always
> happen, though. This is a possibility, although what you described
> as trying for the workarounds should have taken care of this issue.
>
> Assuming that it is fuel related, it's a good idea to take the carbs
> apart and make sure everything is completely clean - no dirt in the
> bowl or lines.
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