Fuel pump
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OK, so I have my other thread going on where several folks are advising that I sh!tcan my electric pump and install a mechanical pump. I took off a mechanical Holley that looked identical to that six valve pump that MT posted. I know I will have to go with a composite or bronze tipped pushrod with my billet cam. Will I need to run a regulator with the six valve pump? Will #8 lines coming from the tank support 580ish HP?
FWIW, I was running that mechanical pump with a Q-jet on my 454. I'm guessing it just looks like the six valve and is not putting out the same pressure, because I don't think the needle and seat on a Q-jet will take much pressure before it blows off the seat. I'll have to pull it out of the attic and take a look at it.
FWIW, I was running that mechanical pump with a Q-jet on my 454. I'm guessing it just looks like the six valve and is not putting out the same pressure, because I don't think the needle and seat on a Q-jet will take much pressure before it blows off the seat. I'll have to pull it out of the attic and take a look at it.
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Qjet handles decent psi.
I like mech pumps over electric, but, did you prove your electric wasn't keeping up ?
I like mech pumps over electric, but, did you prove your electric wasn't keeping up ?
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WOW did not expect this, a lot of great info. Only now I have a lot more to think about, but I am leaning towards Teagues or Claysmith's pumps. Just have to figure out how to get it to fit between sea pump and block. I do have one more question, It seems that the lines between the tank and the carb have to be large, but the opening at the needle and seat is something like .030 so why do you need large lines to push through such a small opening. Just trying to understand.
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WOW did not expect this, a lot of great info. Only now I have a lot more to think about, but I am leaning towards Teagues or Claysmith's pumps. Just have to figure out how to get it to fit between sea pump and block. I do have one more question, It seems that the lines between the tank and the carb have to be large, but the opening at the needle and seat is something like .030 so why do you need large lines to push through such a small opening. Just trying to understand.
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Typical Holley N+S is .110. Many use up to .130". Remember times this by two since the Holley has two of them.
-6 to -8 into the carb is fine for 99% of Performance carb'd marine engines.
We don't have to fight high acceleration G's like automobiles, so that makes it easier on our fuel systems.
Edit in: We do average a ton more gph though. LOL.
-6 to -8 into the carb is fine for 99% of Performance carb'd marine engines.
We don't have to fight high acceleration G's like automobiles, so that makes it easier on our fuel systems.
Edit in: We do average a ton more gph though. LOL.