[Fot] SU HS6 problems during hard braking

[Terry Stetler]

Jason, it’s been a while since I laid eyes on a GT6 engine, so forgive me.  Are both float chambers on the same side of the carbs?  Or is the rear one to the outside rear of the carb and the front one to the outside pointing to the front of the car?  Or vice versa?   Sounds like under braking the carb with the fuel channel to the jet that pointing to the front of the car is getting a higher fuel level and thus flooding that carb.  Is it possible to rotate that float bowl to the other side?

Terry Stetler.

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________________________________
From: Fot <fot-bounces at autox.team.net> on behalf of Jason Sukey via Fot <fot at autox.team.net>
Sent: Saturday, July 13, 2019 9:37:05 PM
To: Greg Blake
Cc: FOT list
Subject: Re: [Fot] SU HS6 problems during hard braking

The floats pivot so the swing front to back.   On the rear carb the pivot pin is nearest the firewall, on the front carb the pivot pin is nearest the radiator.

Thanks,
Jason

On Sat, Jul 13, 2019, 9:29 PM Greg Blake <gblake58tr3 at icloud.com<mailto:gblake58tr3 at icloud.com>> wrote:
What is the orientation of the pivot on the floats?

Sent from my iPhone

On Jul 13, 2019, at 8:17 PM, Jason Sukey via Fot <fot at autox.team.net<mailto:fot at autox.team.net>> wrote:

Phil, I'm running 2 psi.  My fuel pressure gauge stays consistent during the entire run.

Thanks,
Jason

On Sat, Jul 13, 2019, 9:15 PM Phil Gott <vfracing at aol.com<mailto:vfracing at aol.com>> wrote:
Jason;
What sort of Fuel pressure are you running? Should be 1 1/2 to 3 psi, although a Spitfire driver and I run 6 with no apparent ill effect. More than that could be causing you some of this problem.
Phil Gott

Sent from my iPhone

> On Jul 13, 2019, at 8:57 PM, Jason Sukey via Fot <fot at autox.team.net<mailto:fot at autox.team.net>> wrote:
>
> Hello FOT,
>      Running my GT6 at the PVGP historics this weekend.  I've sorted the braking system and installed new tires since the last time out.  Now that I'm actually able to brake hard, I'm suffering from what seems to be fuel flooding, possible sloshing in the float bowls and dumping out the jet into the intake...
>
> During and immediately after a hard braking zone, the engine goes completely "off" and I can smell raw fuel.  After a few seconds it clears out and runs strong in all other conditions, no indication of over rich or starving for fuel. Starts normally, no issues idling.
>
> Original fuel level in the floats was about 1/8" below the top of the jet.  By reducing the fuel level in the bowls from there, the problem has somewhat improved, but it's still significant.  Every session I adjust them a little further, but I'm not sure this is the right fix...maybe a band aid.
>
> Has anyone experienced this with the HS carbs?
>
> Jason Sukey
>
>
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