[Fot] Sputtering TR question

[Duncan Charlton]

Thanks Kas. Even if my particular problem is caused to some degree by another
problem it sounds like a good idea to shock mount the carb.
Duncan

On May 26, 2011, at 2:08 PM, Kas Kastner wrote:

> 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 at rdoequipment.com
>> To: fot at 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 at autox.team.net [mailto:fot-bounces at autox.team.net] On
> Behalf
>> Of Tony Drews
>> Sent: Thursday, May 26, 2011 12:40 AM
>> To: Duncan Charlton; fot at 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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