Question - removing High-Speed with check valve

Discussion in 'Manton Push Rods Top Alcohol Tech Questions' started by Critical Mass, Jun 29, 2018.

  1. Critical Mass

    Critical Mass Member

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    Need some assurance,

    I want to remove my high-speed with a check valve and run only on the main jet. Currently my high-speed has a 0.065 jet with a 65 psi check valve running back to the tank. My base main jet is 0.100 with a base ADR of 95.0 with an Enderle 110 fuel pump. My total area is 0.027949 in2. I only need to turn the motor 7300 rpm for my index, which gives me a 90 psi port pressure. I have install a FIE high-speed with a timer but haven't used it yet.

    My question is what should my new base main jet be. I'm coming up with around 0.120 jet? I would like to hear from you guys before I go out and burn my stuff up.

    Thanks for you help. Joe
     
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  2. Mike Canter

    Mike Canter Top Dragster

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    Well if you take it out and add the fuel to the main jet most likely you will not see any difference in performance because that high speed opens almost immediatly on launch. No if you put it on a timer and open it about 1.2 seconds out you will feel it. So a 65 jet is .003318 sq inches and a 100 jet is .007854 sq inches so if you add those both together equals .011172 sq inches which could be a 119 jet at .011122 sq inches or a 120 jet at .011310 sq inches. So you are correct
     
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  3. Critical Mass

    Critical Mass Member

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    Thanks Mike. I feel better now.
     
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