High volume vs. High pressure oil pump
#31
sv/hp for ftw
in all the confusion when I was buying my oil pump everyone was this pump no that pump no this one... with a white spring but I never asked whats the pressure of a white spring? so better late then never right. Whats the GM white spring rated at?
in all the confusion when I was buying my oil pump everyone was this pump no that pump no this one... with a white spring but I never asked whats the pressure of a white spring? so better late then never right. Whats the GM white spring rated at?
#34
Chevies have a really good stock oiling system. The only reason for going to special pumps if you have non-standard bearing clearances or other special issues. Usually your machinist can answer those question best. Standard rule for oil pressure is 11 psi for every 1000 rpm. If you have that you are fine.
#35
I have the standard volume Melling select pump with the white spring too. Cold oil pressure, assuming the guage is somewhat correct, is around 70-75 pounds or so.
#36
If your not going to use it to its full potential I don't see the justification in buying it but that's just me. When it comes to oiling more is better.
#37
On the comment earlier someone made about HP breaking things. The only time a HP puts any extra load on anything is maybe cold or at high rpms when the pressure does go higher than stock. A HV pump puts more load on ALL THE TIME. Simple logic dictates which would be harder on parts.
Fixxed per Fred's instruction.
Fixxed per Fred's instruction.
Last edited by 96capricemgr; 02-17-2010 at 06:31 PM.
#39
Plus, the multi-visc feature of the oil is a special additive which with all oils will break down over time and return to a base thinner oil of 10wt, which we know is not good if your counting on a 40wt.
So, my opinion is boats use the straight weights for three reasons:
1) Because they can (no winter startup), just like lawn mower that you only use in summer,
2) Boats are hard on oil (produce allot of heat which helps break down the additive which makes it a multi-viscosity)
3) Because they dont change in viscosity as much as a multi-visc when they start to break down (more reliable),
Boats are hard on oil (and gas)!
#40
I think multi-visc are for summer/winter temp swings, boats can ignore the winter swing, as can lawn mowers and roto-tillers, etc.
Plus, the multi-visc feature of the oil is a special additive which with all oils will break down over time and return to a base thinner oil of 10wt, which we know is not good if your counting on a 40wt.
So, my opinion is boats use the straight weights for three reasons:
1) Because they can (no winter startup), just like lawn mower that you only use in summer,
2) Boats are hard on oil (produce allot of heat which helps break down the additive which makes it a multi-viscosity)
3) Because they dont change in viscosity as much as a multi-visc when they start to break down (more reliable),
Boats are hard on oil (and gas)!
Plus, the multi-visc feature of the oil is a special additive which with all oils will break down over time and return to a base thinner oil of 10wt, which we know is not good if your counting on a 40wt.
So, my opinion is boats use the straight weights for three reasons:
1) Because they can (no winter startup), just like lawn mower that you only use in summer,
2) Boats are hard on oil (produce allot of heat which helps break down the additive which makes it a multi-viscosity)
3) Because they dont change in viscosity as much as a multi-visc when they start to break down (more reliable),
Boats are hard on oil (and gas)!
Conventional oils do use a "viscosity extender" to achieve the multiple viscosity characteristics. The extender molecules will break down after extended use, due to high pressure and high temperatures, narrowing the viscosity range. But synthetic oils do not rely on viscosity extenders, minimizing concerns about loss of viscosity range over time.
#41
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