Does high oil pressure hurt horsepower?
05-07-2002, 07:46 PM
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Does high oil pressure hurt horsepower? Just curious, as ported oil pumps are quite popular, but they actually increase the oil pressure (or do they) and I always thought that hurt horsepower.
05-07-2002, 08:43 PM
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Re: Does high oil pressure hurt horsepower? They allow more volume with out much pressure increase except at lower RPM's where you'll see more pressure, but the pressure relief spring stays the same so the max pressure will be close to the same, higher pressure than whats needed or higher volume than whats needed is a HP waste.
05-08-2002, 05:43 PM
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Re: Does high oil pressure hurt horsepower? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by WS6underPRESSURE:
<strong>They allow more volume with out much pressure increase except at lower RPM's where you'll see more pressure, but the pressure relief spring stays the same so the max pressure will be close to the same, higher pressure than whats needed or higher volume than whats needed is a HP waste.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">With my ARE ported oil pump, I actually have a pressure increase as read by the gauge. So if what you're saying is true, I guess my next question is where is the pressure sensor located? If it is before the pressure relief valve, I can see why the pressure gauge would read higher.
Anyone else have any ideas/opinions?
<strong>They allow more volume with out much pressure increase except at lower RPM's where you'll see more pressure, but the pressure relief spring stays the same so the max pressure will be close to the same, higher pressure than whats needed or higher volume than whats needed is a HP waste.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">With my ARE ported oil pump, I actually have a pressure increase as read by the gauge. So if what you're saying is true, I guess my next question is where is the pressure sensor located? If it is before the pressure relief valve, I can see why the pressure gauge would read higher.
Anyone else have any ideas/opinions?
05-08-2002, 05:55 PM
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Re: Does high oil pressure hurt horsepower? What kind of pressures are you seeing? The stock pressure relief I think is set around 60 psi.
You may see more pressure when the oil is cold.
You may see more pressure when the oil is cold.
05-08-2002, 07:41 PM
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Re: Does high oil pressure hurt horsepower? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by WS6underPRESSURE:
<strong>What kind of pressures are you seeing? The stock pressure relief I think is set around 60 psi.
You may see more pressure when the oil is cold.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yes, you do see more oil pressure when the car is warming up. After warmed up, the oil pressure is probably consistently 10-15psi higher than before the ported pump. My oil pressure goes over 70psi at WOT (maybe more, don't have time to check). It's probably a safety precaution, but just curious if this is robbing horsepower.
<strong>What kind of pressures are you seeing? The stock pressure relief I think is set around 60 psi.
You may see more pressure when the oil is cold.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yes, you do see more oil pressure when the car is warming up. After warmed up, the oil pressure is probably consistently 10-15psi higher than before the ported pump. My oil pressure goes over 70psi at WOT (maybe more, don't have time to check). It's probably a safety precaution, but just curious if this is robbing horsepower.
05-08-2002, 09:04 PM
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Re: Does high oil pressure hurt horsepower? With 10-15 psi higher than before I don't think you'll be losing enough HP to worry about, maybe just 1-2 HP.
As a rule of thumb you need about 10 psi for every 1000 RPM's you run.
Also you didn't say what weight oil your running, that will have an effect on your pressure too.
As a rule of thumb you need about 10 psi for every 1000 RPM's you run.
Also you didn't say what weight oil your running, that will have an effect on your pressure too.
05-08-2002, 09:56 PM
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Re: Does high oil pressure hurt horsepower? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by WS6underPRESSURE:
<strong>With 10-15 psi higher than before I don't think you'll be losing enough HP to worry about, maybe just 1-2 HP.
As a rule of thumb you need about 10 psi for every 1000 RPM's you run.
Also you didn't say what weight oil your running, that will have an effect on your pressure too.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Interesting, you think it's only 1 to 2 HP? Any dyno data or just a hunch? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I'm using thicker oil, 10W30. With 5W30, it might be alittle less pressure. It'd be interesting to see dyno data between the different oil weights while keeping an eye on the oil pressure. It may really be insignificant, or it may not be.
<strong>With 10-15 psi higher than before I don't think you'll be losing enough HP to worry about, maybe just 1-2 HP.
As a rule of thumb you need about 10 psi for every 1000 RPM's you run.
Also you didn't say what weight oil your running, that will have an effect on your pressure too.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Interesting, you think it's only 1 to 2 HP? Any dyno data or just a hunch? <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
I'm using thicker oil, 10W30. With 5W30, it might be alittle less pressure. It'd be interesting to see dyno data between the different oil weights while keeping an eye on the oil pressure. It may really be insignificant, or it may not be.
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05-08-2002, 10:04 PM
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Re: Does high oil pressure hurt horsepower? My hunch is it may cost you more than 1 or2 hp to have higher pressure and more volume, remember more oil pumped means more oil spraying down and around spinning and reciprocating parts causing windage. You could also starve oil pump pickup easier if you have more volume being pumped out of stock capacity oil pan. I believe in adequate and consistent oil delivery not more than you need to keep bearings seated and cool.
05-08-2002, 10:43 PM
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Re: Does high oil pressure hurt horsepower? The 1-2 HP was just a hunch but it didn't include the extra oil drag on the crank and other moving parts so the HP loss is probably higher, like LS1derfull said.
I was just looking at the HP loss from the oil pump.
I was just looking at the HP loss from the oil pump.
