[Fot] Float needle valves

Fri Mar 19 02:47:46 MDT 2021

Maybe the spring is there to even out the pressure on the needle/valve seat surface when the fuel is agitating on the float . In doing so the plastic end on the needle doesn't wear out but higher fuel pressure can easily lift the needle off the seat. I believe this is useful for a road car but not for a race car. 
Marcel. 

Van: "fot" <fot at autox.team.net> 
Aan: "Bruce Stutzman" <stutztr4 at gmail.com> 
Cc: "fot" <fot at autox.team.net> 
Verzonden: Vrijdag 19 maart 2021 02:38:52 
Onderwerp: Re: [Fot] Float needle valves 

Yes. I don’t really understand why the little spring is used, which is why I asked. Joe told me the same thing but not why.... 
Phil 

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On Mar 18, 2021, at 3:37 PM, Bruce Stutzman <stutztr4 at gmail.com> wrote: 

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Unfortunately I don't remember which, but Joe Curto specifies solid needles for certain SUs and spring loaded for others. 
Bruce Stutzman 

On Wed, Mar 17, 2021 at 5:58 PM Phil Gott via Fot < [ mailto:fot at autox.team.net | fot at autox.team.net ] > wrote: 

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Thanks, everyone! 
Phil 

Sent from my iPhone 

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On Mar 17, 2021, at 3:27 PM, Erik Jacobsen via Fot < [ mailto:fot at autox.team.net | fot at autox.team.net ] > wrote: 

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Tony, 
Yeah, same scenario in my Bugeye with 3-screw tops (even if they're tiny compared to your TR-4 carbs), one front pivot, one back pivot. 

On Wednesday, March 17, 2021, 02:17:43 PM CDT, Tony Drews via Fot < [ mailto:fot at autox.team.net | fot at autox.team.net ] > wrote: 

With the SU's with the 3 screw tops we ended up with one pivoting at the front and another at the back. Any other orientation resulted in weirdness after hard braking, right when you want to stomp the gas. 

Another vote against grose jets, they couldn't handle hardly any fuel pressure and the stock needle valves did great under up to 7 psi (more than we wanted, but fighting the doggone regulators). 

- Tony Drews 
On 3/17/2021 1:22 PM, Phil Gott via Fot wrote: 

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Yup. 
Had that problem. Floats must “face” fore and aft, meaning the pivot points across the car. WIth pivots at an angle to the car we first tried to overcome the apparent starvation in turns by increasing the fuel pressure, which just made things worse. Fuel pressure at 2 1/2 psi and fore/aft floats works well. 
Thanks., 
Phil 

Sent from my iPhone 

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On Mar 17, 2021, at 12:41 PM, rek46 via Fot [ mailto:fot at autox.team.net | <fot at autox.team.net> ] wrote: 

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NO GROSSS JETS...lousy and not for competition....Use GOOD/New old style floats....you need positive open and close.....heres a tip..check your float direction for best perf....meaning , are you having brake to accel. probs on heavy brake corners? You prob have each float facing toward center...not best....Solved by making both floats face same direction(frt. or back)....rick 
In a message dated 3/17/2021 12:04:02 PM Eastern Standard Time, [ mailto:fot at autox.team.net | fot at autox.team.net ] writes: 

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Thanks, Erik and Joe; 
Good to know. 
I’ve had Gross Jets hang open with some royal flooding. Won’t use those again! 
Phil 

Sent from my iPhone 

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On Mar 17, 2021, at 11:19 AM, Erik Jacobsen [ mailto:kekjacobsen at yahoo.com | <kekjacobsen at yahoo.com> ] wrote: 

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Phil, 
I use the plain old solid needles in both street and race cars and haven't had any issues. They do wear out eventually, but after 7 years in the race car, I still haven't had a problem. 
Jake 
On Wednesday, March 17, 2021, 10:13:30 AM CDT, Joe Boruch via Fot [ mailto:fot at autox.team.net | <fot at autox.team.net> ] wrote: 
Phil, years ago I stopped using Gross Jets, which have the spring loaded ball on the end of the float needle. I suspected some flow issues and others had said that they had issues. JoeB 
On Wednesday, March 17, 2021, 08:16:11 AM EDT, Phil Gott via Fot [ mailto:fot at autox.team.net | <fot at autox.team.net> ] wrote: 
Anyone have experience with needle valves that do not have the spring loaded contact where the needle valve rests on the float? Is a solid one better, worse, or require different set up? 
Phil Gott 
Sent from my iPhone 
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