sbc oil pump
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sbc oil pump
I know this has been discussed before. But not in this exact application..
I am building a 427 sbc. The oil clearance on the rods are all .002 the main oil clearance is .0025 to .0027 The rod side clearance is .022 to .025. it is a hyd roller engine. motown block..
Is there any reason i would need a high volume pump on this engine??? I ask because i have been using standard oil pumps in the last 20 small blocks i built with zero issues. I had a oil pan made just for this application and the manufacturer sent a hv pump along with the pan....
I am thinking about using a standard pump... Any reasons not to???
Keith
I am building a 427 sbc. The oil clearance on the rods are all .002 the main oil clearance is .0025 to .0027 The rod side clearance is .022 to .025. it is a hyd roller engine. motown block..
Is there any reason i would need a high volume pump on this engine??? I ask because i have been using standard oil pumps in the last 20 small blocks i built with zero issues. I had a oil pan made just for this application and the manufacturer sent a hv pump along with the pan....
I am thinking about using a standard pump... Any reasons not to???
Keith
“If I hit you with this you’re going to be numb, that’s why they call them numb-chucks “Si Robertson
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Re: sbc oil pump
We have always used the standard volume pump with high pressue spring with no issues for years and plenty of oil pressure.k-star wrote:I know this has been discussed before. But not in this exact application..
I am building a 427 sbc. The oil clearance on the rods are all .002 the main oil clearance is .0025 to .0027 The rod side clearance is .022 to .025. it is a hyd roller engine. motown block..
Is there any reason i would need a high volume pump on this engine??? I ask because i have been using standard oil pumps in the last 20 small blocks i built with zero issues. I had a oil pan made just for this application and the manufacturer sent a hv pump along with the pan....
I am thinking about using a standard pump... Any reasons not to???
Keith
Side clearance does not really factor into the equation as the the bearing clearances dictate oil flow or resistance. If this was true the piston guided rod engines we have work on with over .090 side clearance would be running zero pressure.
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I would vote on the standard volume setup as well. If you went to a high volume setup I would set the pressure spring in the 50psi range and run a lighter oil since you are going to have some awesome oil pressure when cold.
I run std volume pumps on all NA hyd roller street motors seeing 7500rpm or less. Obviously from SupStk's comments you don't need any more than that if you spin it higher.
Bret
I run std volume pumps on all NA hyd roller street motors seeing 7500rpm or less. Obviously from SupStk's comments you don't need any more than that if you spin it higher.
Bret
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Re: sbc oil pump
CNC BLOCKS wrote:We have always used the standard volume pump with high pressue spring with no issues for years and plenty of oil pressure.k-star wrote:I know this has been discussed before. But not in this exact application..
I am building a 427 sbc. The oil clearance on the rods are all .002 the main oil clearance is .0025 to .0027 The rod side clearance is .022 to .025. it is a hyd roller engine. motown block..
Is there any reason i would need a high volume pump on this engine??? I ask because i have been using standard oil pumps in the last 20 small blocks i built with zero issues. I had a oil pan made just for this application and the manufacturer sent a hv pump along with the pan....
I am thinking about using a standard pump... Any reasons not to???
Keith
Side clearance does not really factor into the equation as the the bearing clearances dictate oil flow or resistance. If this was true the piston guided rod engines we have work on with over .090 side clearance would be running zero pressure.
Sorry I misread the post as I thought is was a BBC and now I see its a 427 SBC as I would use the M-55HV as on those pump we rework the pump and machine an extra bypass hole in the cover and shorten the plunger about .080 and seems to work fine for us.
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oil pump
Ok i guess i'll use the hv pump... It does have a cross drilled crank also..
Carl what do you do to modify the pump???? Do you just shim the plunger to loose the .080" ???? where do you drill the extra by-pass hole....
Keith
Carl what do you do to modify the pump???? Do you just shim the plunger to loose the .080" ???? where do you drill the extra by-pass hole....
Keith
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I'm gonna guess that the extra bypass hole is a continuation on the bypass into the intake, but instead of stopping the cross hole in the bypass/spring hole you cross thru that. Therefore when you bleed off extra oil it bypasses out into the pan rather than back into the pump intake. This would cut down areation of the oil.
Bret
Bret
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SStrokerAce wrote:I'm gonna guess that the extra bypass hole is a continuation on the bypass into the intake, but instead of stopping the cross hole in the bypass/spring hole you cross thru that. Therefore when you bleed off extra oil it bypasses out into the pan rather than back into the pump intake. This would cut down areation of the oil.
Bret
Your right and we see less high pressures when the engines are cold and the dist. gears look a lot better.
We cut the plunger back to expose more of the bypass hole that drilled in the cover so the punger will come back more with out hitting the pin.
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BretSStrokerAce wrote:Thanks Carl... I like that idea as well.
Have you plugged the bypass hole that goes back into the intake all together with a set screw or something? I'm just thinking about getting rid of as much aeration of the oil as possible for hyd lifter applications.
Bret
Nothing but just adding an extra bypass hole and shorten the plunger.
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Yes I shorten it around .080 seem to work for me,SStrokerAce wrote:How much do you shorten the plunger? The bypass hole is easy.... you just don't want the plunger too short because you could uncover the hole outlet hole correct?
Bret
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55MM babbit cam bearings with 1 hole
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Yeah I didn't think you would want a ton off of it. I've found the limit to the plunger travel for me can be the spring coil bind length since I usually just make a shim to get the pressure where I wanted it. If you take too much off and uncover either bypass hole the pump will have less or no suction thru the pickup so that's about usless.
Good conversion Carl, thanks.
Bret
Good conversion Carl, thanks.
Bret