[Healeys] SU carb fuel pressure

[richard mayor]

Not sure if this information will help,  but I had some Sprite racer
friends that were anal about having everything look good.  So they
aligned/oriented the float chamber tops about 90 degrees away from the
factory orientation because they thought it looked better.   As I  recall,
this realignment put the float arms in line with the cars front to back
orientation. This made the floats and float arms react by pivoting in
response to hard braking and/or acceleration and either causing fuel
starvation or flooding.  I don't recall which.  My point being that
apparently float arm orientation can cause some issues.


On Sun, Jun 14, 2020 at 10:46 AM Michael Oritt <michael.oritt at gmail.com>
wrote:

> Gary--
>
> 2 to 4 psi is the common wisdom.
>
> That said, I had a set of HS6's on the MGA engine in my (now-gone) Elva
> Courier and no amount of fiddling with floats, lid position, etc. would
> solve a consistent fuel starvation problem when coming of hard, tight
> right-handers under full throttle as in turns 1 at VIR, Summit Point, etc.
>  I finally solved the problem by installing a Holly Blue (high-pressure
> fuel pump) and reducing pressure via a regulator to about 5.5-6 psi.  Dire
> predictions notwithstanding I never had an issue  with the floats' being
> overcome by that pressure and causing leaking.
>
> I'm not saying anyone should go to such extremes without a good reason but
> I think the "common wisdom" is just that and not always gospel.
>
> Best--Michael Oritt
>
> On Sun, Jun 14, 2020 at 12:27 PM warthodson--- via Healeys <
> healeys at autox.team.net> wrote:
>
>> What is the Max recommended fuel pressure (psi) for SU HS 6  Carbs. Is
>> there  also a Min fuel pressure?
>> Gary Hodson
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