Plumbing OMP into Edelbrock Q&A

Jeff20B · 12-17-2008, 06:10 PM

As most of us know, RB has plumbed the OMP lines into their modified Holley carbs for decades now. It works. Why can't we do that with Edelbrocks?

I have a Camden supercharger project to get up and running and I have a perfectly functioning OMP. I've thought of three possible ways to plumb oil into the engine.

1. Directly into the carb like the RB Holley.
2. into the carb adaptor above the SC (equivilant to a carb spacer for you NA guys)
3. into the manifold - some Camden manifolds are already drilled and tapped for stock OMP injector fittings above the intermediate ports. My manifold is blank there.

PercentSevenC pointed out a potential flaw in #3. He said the runners possibly flow uphill there, and would result in oil pooling in the middle of the manifold, which would then dump into the engine under the right conditions leading to a batscreen effect. Having just examined my 5" manifold, that is not the case. It would seem #3 is possible.

There is a potential flaw in #2. Engine vacuum, or rather SC vacuum is high there and could potentially suck more oil into the intake than is necessary, leading to more oil consumption and smoke on startup and while idling; basically acting like a worn oil seal condition where none exists. Has anyone ever done this? I kinda sorta did on a weber lower manifold, which did smoke at idle.

Last but least is a partial flaw with #1 where it may be possbile to replace a percentage of fuel in the float bowl with oil, if idled for a long enough period of time. You've heard of Holley carbs 'loading up' on rotaries, haven't you? I fear this could happen with an Edelbrock similarly plumbed into the float bowl as the RB holleys are.

What is the best solution? #3? It's what Camden does.

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12-17-2008, 06:10 PM	#1
Jeff20B Rotary Fanatic Join Date: Mar 2008 Posts: 215 Rep Power: 18	Plumbing OMP into Edelbrock Q&A As most of us know, RB has plumbed the OMP lines into their modified Holley carbs for decades now. It works. Why can't we do that with Edelbrocks? I have a Camden supercharger project to get up and running and I have a perfectly functioning OMP. I've thought of three possible ways to plumb oil into the engine. 1. Directly into the carb like the RB Holley. 2. into the carb adaptor above the SC (equivilant to a carb spacer for you NA guys) 3. into the manifold - some Camden manifolds are already drilled and tapped for stock OMP injector fittings above the intermediate ports. My manifold is blank there. PercentSevenC pointed out a potential flaw in #3. He said the runners possibly flow uphill there, and would result in oil pooling in the middle of the manifold, which would then dump into the engine under the right conditions leading to a batscreen effect. Having just examined my 5" manifold, that is not the case. It would seem #3 is possible. There is a potential flaw in #2. Engine vacuum, or rather SC vacuum is high there and could potentially suck more oil into the intake than is necessary, leading to more oil consumption and smoke on startup and while idling; basically acting like a worn oil seal condition where none exists. Has anyone ever done this? I kinda sorta did on a weber lower manifold, which did smoke at idle. Last but least is a partial flaw with #1 where it may be possbile to replace a percentage of fuel in the float bowl with oil, if idled for a long enough period of time. You've heard of Holley carbs 'loading up' on rotaries, haven't you? I fear this could happen with an Edelbrock similarly plumbed into the float bowl as the RB holleys are. What is the best solution? #3? It's what Camden does.