Oil pump. Std. or high volume?
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Oil pump. Std. or high volume?
I have read much on this site (and elsewhere) recomending high volume oil pumps. What is the advantage? Nobody has actually said why they are better than a standard volume oil pump. Are there any drawbacks to using one over a standard volume? I'm just not sure. Thanks.
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From: MTNS of NC
standard is probably fine if you're not on steep angles or hihg rpm,if you go with the high volume I'd spend the bucks and install an oil pan with a deeper sump to feed pump and lessen chance of oil starvation ,also if its a 351/400 I'd install the extra oil line to feed back bearings.
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From: MTNS of NC
OH , sorry if everyone thinks I give bad advice,but,I've researched the 400 engine in particular for about the last 6 or 7 years to come up with my combo and I think it works great,but some of you guys might not want the same level of performance that I have(550HP-446TQ 250HP chemical inhancement) I truly apoligize if I mistakenly give anyone the wrong advise ,but, I just can't get the HIPO train of thought out of my head
Laughing Gas
Joined: Feb 2003
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From: In the woods of Oregon
You don't need the extra oil line. People only needed to do that for 7000+RPM drag racing, as did guys with mopars. The oil pressure sending unit is at the end of the supply rout so your effectively measuring the lowest oil pressure point. A HV oil pump isn't a bad idea I run one with a 5-6 quart oil pan and have never had starvation issues. My 2Cents.
Elder User
Joined: Jan 2004
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From: Eastern Pa
I used the high volume Melling on mine and their hardened rod which is probably of equal importance if you are doing any extra torque or rpm. I take mine to 5500 without any problem and a stock 4X4 pan.
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My plan involves a 400 (.030 over) with a Comp Cams XE 262 k-kit, 10:1 compression, 2v alloy heads, flat tops from TMI, full roller alum. rockers, Edelbrock performer 400 manifold with a 650 AVS carb and 1" spacer, Hedman Elite headers, and a 2.5" dual exhaust with crossover pipe. If I've done my homework properly, with the help of others on this site, I should be able to go to 5500 rpms safely, and produce a nice fat torque curve through at least 4500 rpms. Now,... with all that long winded explanation of what I am trying to do, I'm trying to lay the plans for a pretty bulletproof bottom end, and making decisions on what internal parts to use. Thanks.
Cargo Master
Joined: May 2003
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From: Earth
Originally Posted by tastyklair
I used the high volume Melling on mine and their hardened rod which is probably of equal importance if you are doing any extra torque or rpm. I take mine to 5500 without any problem and a stock 4X4 pan.
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From: chicago burbs
if you decide on the HV pump make sure you don't go too heavy on the oil. billet oil pump driveshafts are nice but the weakest link is the roll pin, bottom line is that the ONLY thing that turns the oil pump is the distributor gear roll pin.. thick oil and a high vol pump will strain it past it's limits when you least expect it. in cold weather(thick oil) if the engine hiccups or coughs that'll be all it takes. it's happened to me at least three times but not lately, i gave up the molasses oil.
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From: not mass
ok why do you think you would need a HV pump?
is it loosing oil pressure?
if you make sure all the clearences are in spec and there is no need for a HV pump unless you are going to spin it up
these is also a blue printed pumps available in this case the pump they make sure is actually right
is it loosing oil pressure?
if you make sure all the clearences are in spec and there is no need for a HV pump unless you are going to spin it up
these is also a blue printed pumps available in this case the pump they make sure is actually right
Posting Guru
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From: PacNW
A high volume pump moves more oil quickly so it gets it back to the pan sooner to be cooled which is a good thing particularly in racing engines which sustain high RPMs for extended periods of time. If you increase the oil capacity significantly by adding an oil cooler or deep sump pan then a HV pump might be a good idea.
You also have to pay close attention to the bearing clearances with a HV pump. Typically racing engines have much higher clearances than street engines beacuse they run much hotter. If your bearing clearances are too tight then you stand a much better chance of the roll pin shearing due to excessive oil pressure. Main & rod bearings have min & max specs so if even if they are on the tight side of min you can have shear pin issues.
For virtually all of the street engines out there a std volume pump is more than adequate. Regardless of the type of pump used a good driveshaft like ARP or Milodon is cheap insurance.
You also have to pay close attention to the bearing clearances with a HV pump. Typically racing engines have much higher clearances than street engines beacuse they run much hotter. If your bearing clearances are too tight then you stand a much better chance of the roll pin shearing due to excessive oil pressure. Main & rod bearings have min & max specs so if even if they are on the tight side of min you can have shear pin issues.
For virtually all of the street engines out there a std volume pump is more than adequate. Regardless of the type of pump used a good driveshaft like ARP or Milodon is cheap insurance.
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