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?

 

I read the white spring was around 70 PSI. I also read the best thing anyone can do for oil flow is champfer the edges of the hole in the block where the oil pump mates.

 

The Melling pink and GM white are essentially the same thing.

 

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.

 

Sounds about right.
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.

 

The didn't do very well on the first version of the LSx block.....

Oil that you don't need is wasted energy. More HP lost pumping it, more wear on the drive system, possible heat buildup, possible cavitation on the suction side.......

 

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.

 

You might want to change one of those "HV" 's to an "HP"

 

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)!

 

The "W" rating is for cold starts, not just for freezing/winter weather. Cold, in that respect means less than 100*C.

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.

 

Check this out. I wrote it.

http://www.kennedysdynotune.com/Oil%...ure%20Tech.htm

Rich

 

what pickup would i use for a 10554? It would have to be from canton but i dont see one that matches mellings 10554, although i seen where they list one for the 10552.