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Thrasher187
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Discussion Starter · #1 ·
Anyone ever had a standard holly float get crushed by high fuel pressure (15psi) with a boost regulated regulator on a blower application? My engine guy said I need phenolic floats that come in the marine conversion kit on ebay for $62 each. I have never heard of this. I just bought 2 new holly 750 blower carbs and know I need to swap the vents to j tubes, but the floats too? I am ok with spending the money but I am curious.
 

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Anyone ever had a standard holly float get crushed by high fuel pressure (15psi) with a boost regulated regulator on a blower application? My engine guy said I need phenolic floats that come in the marine conversion kit on ebay for $62 each. I have never heard of this. I just bought 2 new holly 750 blower carbs and know I need to swap the vents to j tubes, but the floats too? I am ok with spending the money but I am curious.
They aren't called "phenloic" they are "nitrophyl" floats.
Is this a roots type blower, or a blow thru centri or turbo deal? Why are you boost referencing the regulator?

I take it that because you have 2 carbs that it is a roots type blower. You do not hook the regulator to the manifold for reference on a roots blown deal. Set the fuel pressure at 6, max 7 PSI at idle and check it at WOT at max RPM and make sure you have at least 5 psi a WOT.

You do not need the J tubes if the engine is not enclosed. You only need them for enclosed engine compartments.



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Or Seth, either one
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:iagree:

Steve, GN7 is right.

Roots blown engines don't need nitrophyl floats or a boost referenced fuel pressure regulator. 6-7psi fuel pressure. NO more.

The floats and boost referenced fuel pressure regulator are mandatory in a blow through set-up, with a centrifugal supercharger or turbo charger.

If you are doing a blow through, yes brass floats will crush.
 
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