mrhrholden
Registered: 12/29/11
Posts: 5
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| | 02/11/12 at 09:25 AM | Reply with quote | #1 |
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Hi Patric still having trouble setting fuel pressure to 7psi with vacume port hooked up to base of carb.
i warm engine up let engine idle at 1200rpm and adjust the fuel pressure by screwing in the adjuster on the top of the regulator i get about 3.5psi and then the regulator adjuster bottems out and pushes open the check valve in the regulator and pumps 25psi into the carb and floods the engine. any ideas? Its like the engine is pulling too much vacume pulling the fuel pressure back
other than that the engine runs great very happy
I can adjust the fuel pressure to 7PSI with no vacume port hooked up and all is fine.
my fuel pump is a MagnaFuel Quick Star 300 and fuel pressure regualtor is ProSystems / Holley 12-704 with vacume refrence
thanks for your help
Mark
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PRO-SYSTEMS
Moderator
Registered: 12/16/11
Posts: 302
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| | 02/11/12 at 10:19 AM | Reply with quote | #2 |
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Many times if they are idling too lean they will make excessive amounts of vacuum that will be difficult to control as the level of vacuum will move up and down on a lean idling engine.
Richen the idle up (be sure your timing is locked out and not moving around at an idle) and the pressure should stabilize.
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mrhrholden
Registered: 12/29/11
Posts: 5
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| | 03/03/12 at 03:20 AM | Reply with quote | #3 |
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| Hi patrick i am at powercruise in sydney australia racing my car i think we might have to change the air bleeds the engine is very cranky down low below 4000rpm but takes off like a rocket after that. The air fuel ratio is rich below 4000rpm thank you |
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mrhrholden
Registered: 12/29/11
Posts: 5
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| | 03/03/12 at 03:21 AM | Reply with quote | #4 |
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| Hi patrick i am at powercruise in sydney australia racing my car i think we might have to change the air bleeds the engine is very cranky down low below 4000rpm but takes off like a rocket after that. The air fuel ratio is rich below 4000rpm thank you |
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PRO-SYSTEMS
Moderator
Registered: 12/16/11
Posts: 302
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| | 03/03/12 at 06:42 PM | Reply with quote | #5 |
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On 30792 I would install a 4.5 power valve in the primary side. Drill the power valve feeds in the metering block out to .096 (3/32) and install a main jet 14 sizes smaller.
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mrhrholden
Registered: 12/29/11
Posts: 5
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| | 03/05/12 at 06:27 AM | Reply with quote | #6 |
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Hi Patrick thanks for the reply i didnt have parts on the day. i ordered a power valve and main jets today should have them in the morning and will give that a go. i drilled out the power valve restriction tonight. thank you for your help
Mark
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PRO-SYSTEMS
Moderator
Registered: 12/16/11
Posts: 302
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