I would like to hear some opinions on oil pressure on some NA deals. How much is to much? How much is to little? What do the NHRA Pro Stockers run? Wet sump engines with high vacuums.
You can run as low as around 25-30psi if you take the time to control all the internal bleeding, generally people don't take the time to think about all the unrulliness taking place within the crankcase. Gun drilled rods for the high vac .I would like to hear some opinions on oil pressure on some NA deals. How much is to much? How much is to little? What do the NHRA Pro Stockers run? Wet sump engines with high vacuums.
X2I generally don't run high pressure in my NA engines. 40-ish peak. Just no reason for more. I haven't been focusing on that area though lately to be honest.... I believe if you put attention to detail on oil Control, 25-35 would be fine for 9500+ engine. If you felt that is what your program needed.
I know that 500" NHRA Pro Stockers are running under 20 lbs and have been for 2 or 3 years. I know about dyno runs with only 12 lbs on same engine. Slight power increases but at what cost. I just can't see how low pressure combined with using snake oil isn't a recipe for disaster.
Your right Chris. Right now I have 50-60 PSI with 18-20 inches of vacuum. #9 oil. My issue is not with pressure I can turn it up or down a bit Im more concerned if I have to much oil pump. I have a SCP 1.450 Pressure section. Seems I have to run some pretty tall pullies to keeep it down. My runs start @ 75-80 PSI and as vacuum increases it pulls it down. Im also concerned with cavitation going on with that big pump. What do you think?Depends on the goal with the engine. At what cost? I would say at zero cost. Certainly it is a disaster if you're not designing the engine for it.
I have to ask the question, Why do I want 65 pounds of pressure at 7000 rpm in a given engine?
I think most folks out there are simply using what they have been taught is the norm, and what they have read in magazines. That is good for folks who have that depth of engine skills.
But folks who are building an engine like Tim is in the original post, he is deciding to put focus on the oiling system and there are gains to be had. 5 hp for him is a big deal.
More is not always better. Sometimes less is more.
18-19 Crank 44-46 Oil pump. I have never been able to get the oil pressure down were it could see a difference. But again I think the 1.450 Pressure section is just to big for a 302 Main Honda rod deal. Like you said 5 HP is a big deal. I have had this pump for over 8 years,just wondering if it is time to go?I'd limit the section to 1.1-1.2 max what is the pulley sizes?