Interesting, although we run Weber's, as does Tony, 3 to 3.5 psi works fine on
courses without long straights, but the long straights at VIR, Road Atlanta,
Summit Point & Savannah found us having fuel starvation problems near the end
of the straight; so we had to up the pressure at the regulator to solve this as
well.
-----Original Message-----
From: Fot <fot-bounces@autox.team.net> On Behalf Of Tony Drews via Fot
Sent: Friday, March 10, 2023 2:20 PM
To: fot@autox.team.net
Subject: Re: [Fot] Fuel Pressure
Rod, SU's without grose jets (don't use those) should be fine at 3 psi in my
experience. We were able to run them up to 6 or 7 psi when pushed.
If the regulator works fine for you, no issues. A problem we ran into years
ago was fuel shutting off at the end of long straights (like at Road America -
3 1/2 mile long straights). Eventually we figured out the regulator was
getting deadlocked - the differential between the input and output pressure
wasn't enough to keep it cycling so we had to go to a higher pressure fuel
pump. There's actually a regulator in the pump as well and that can fight the
downstream one apparently. If it aint broke, don't fix it - but if you run
into issues with fuel starvation after long pulls it's something to look into.
No input on the spark plugs.
Regards, Tony Drews
On 3/10/2023 11:22 AM, Rod Pierce via Fot wrote:
> I recently acquired a fuel pressure checking kit so I decided to check
> the fuel pressure going into and coming out of the regulator on my
> Spitfire.  I had about 6 psi going in and 3 psi coming out. Just as
> it should be, or at least that is what I have heard. I have dual SUs.
>
> I'm looking for confirmation or thoughts about the fuel pressure.
>
> Also, what spark plugs to use with my newly rebuilt 1300 with a shaved
> head and forged pistons. I'm running 110 octane. I don't doubt this
> discussion has been had already so if somebody can direct me to a
> thread that would be great.
>
> Thanks
>
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