[Fot] SU float needle/seat

[Andrew Devenish]

Hi Jason, thanks for the reply. I think that is exactly what is happening. The car starts and runs very crisply, but after a few laps of the yard the O2 tells me it goes very lean and then it stops. Fuel pressure is still good. When I check, the fuel is very low in the front bowl, and the front two plug shows lean. I will carefully break that edge as you suggest.

Thank you,
      Andrew Devenish

Sent from my iPad

On May 25, 2024, at 10:20 AM, JS Performance Motoring, LLC <jason at jsperformancemotoring.com> wrote:


Andrew,

I presume they are sticking closed, not open?

I've seen some where the brass seat has a sharp edge that grabs the viton, locking it shut.

I take a small center drill and break the sharp edge by hand.   That seems to help.

3 to 4 psi is plenty high enough.   I run closer to 2 psi on mine.

Jason


On Sat, May 25, 2024, 9:59 AM Andrew Devenish via Fot <fot at autox.team.net<mailto:fot at autox.team.net>> wrote:
Hi All, am having a little trouble with the needle/seat in my SU HS4 using the AM viton tipped parts from Moss. Using pressure 3-4 PSI (running) they have a quickly (< 1 hour use, but a lot of assembly/disassembly) shown a visible line, and are now sticking. Is there a recommended source for these parts ?   I see 070 and 096 bore parts offered - which is considered best for HS4 on a race 1300 ?
Should I be running higher fuel pressure ?

Thank you,
      Andrew Devenish

Sent from my iPad

> On May 23, 2024, at 5:34 PM, Barr, Scott via Fot <fot at autox.team.net<mailto:fot at autox.team.net>> wrote:
>
> I loved the Carbotech pads when I was using them on my GT6 for track days.  I never had the odd wear problems that have been described.  I always used the Hawk Blues on my Spitfire racer and liked those as well, though they didn't have to deal with the same heat as was generated by my GT6 brakes at Blackhawk.  The Hawk Blues I use on my Spec Racer Ford also work really well and stand up to enough heat to turn the rotors blue.  If you're unhappy with the Carbotech pads, the Hawk Blues are a good option, in my opinion.
>
> Scott (B.)
>
>
> -----Original Message-----
> From: Fot <fot-bounces at autox.team.net<mailto:fot-bounces at autox.team.net>> On Behalf Of Scott Janzen via Fot
> Sent: Thursday, May 23, 2024 4:02 PM
> To: finishing Touch <fintouch at ptd.net<mailto:fintouch at ptd.net>>
> Cc: Mark Cook via Fot <fot at autox.team.net<mailto:fot at autox.team.net>>
> Subject: Re: [Fot] TR6 Porterfield R-4 Rear Brake Shoes - Carbotech relining
>
> I agree. I get the pre-heated ones too. Carbotech stops as well or better, and last longer than any other pads I’ve tried, and I’ve tried quite a few.
> Sent from my iPhone
>
>> On May 23, 2024, at 4:10 PM, finishing Touch via Fot <fot at autox.team.net<mailto:fot at autox.team.net>> wrote:
>>
>> I'm on my 3rd set of Carbotech front pads for my TR6 race car and never had any issues....I do spend the extra $ and have them pre-bedded.
>>
>> Mike Kurtz
>> #51 TR6
>>
>>
>>
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