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Who here uses a big block oil pump on their small block? I just realized the guy that built my motor last time did. I'm not sure why or what you would benifit from it? More volume? Anyway, I'm angry now because I finally got everything to put my motor back together and now I can't do any more tonight because Napa is closed and I ordered a small block pump. I guess the 5 bolts on the pump cover instead of the usual 4 should have given me a hint. Oh well at least I learned something. I also believe the shaft is shorter that hooks to the distributor when I compare it to a regular SMC one. Maybe because my block has been decked? I don't know. Anyone else have any input as to why this may be? Now I have nothing to do except sip on this fine Rum and Coke.
The Big block pump bolts onto the small block but requires a short, (5.625" long) shaft (not the same as the even shorter front sump shaft). Moroso makes one #2290 . If you are using a 400 block, you'll need to machine the pump shaft opening to 9/16".
The big block pump eats a lot of power and, IMO, isn't really necessary. Some people believe the extra teeth on the BBC pump reduce spark scatter, but I haven't seen any documentation that there is any benefit.
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Quote:
Originally Posted by Paul Wright
Building a small, high rpm engine
with the perfect bore, stroke and rod ratio is very impressive...
like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.
Cubic inches is like Indiana Jones with a cheap pistol..
Last edited by Paul Wright; 9th-May-2009 at 12:35 PM.
AL, do you know if the pickup tube is 5/8" or 3/4"? The one I took off is 3/4" and I want to know if it will fit that M99HVS pump. My pickup has been modified for my 10.5" deep pan so I want to reuse it. Thanks.
AL, do you know if the pickup tube is 5/8" or 3/4"? The one I took off is 3/4" and I want to know if it will fit that M99HVS pump. My pickup has been modified for my 10.5" deep pan so I want to reuse it. Thanks.
3/4 inch
AL
__________________
“The bitterness of poor quality & Service remains long after the sweetness of low price is forgotten”
I'd be curious to know what the power loss of a BB pump vs a sb hi vol pump.
I'm sure this has been asked a thousand times. Does anyone have a ballpark idea how much more it does take to spin a high volume pump? Is it the high pressure or high volume that takes the extra power to spin?
The last time i had a bigger pump like that it was a DZ 302 pump that my uncle had laying around and we used it in my first 350 engine. He said chevrolet used them in Z28's for better hi rpm oiling.
I'd be curious to know what the power loss of a BB pump vs a sb hi vol pump.
The BBC pumps wastes 12 hp, the SBC pump 10 hp. My pump is about 6-7 hp. I'm going to try and get it down to 5 hp as soon as I can build my new strain gauge pump dyno.
Quote:
Originally Posted by Lugnut79
I'm sure this has been asked a thousand times. Does anyone have a ballpark idea how much more it does take to spin a high volume pump? Is it the high pressure or high volume that takes the extra power to spin?
High volume pumps use taller gears which have more friction than the standard height gears. You can read all about pressure and volume at my tech page:
Building a small, high rpm engine
with the perfect bore, stroke and rod ratio is very impressive...
like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar.
Cubic inches is like Indiana Jones with a cheap pistol..
Last edited by Paul Wright; 11th-May-2009 at 08:41 AM.
AL, do you know if the pickup tube is 5/8" or 3/4"? The one I took off is 3/4" and I want to know if it will fit that M99HVS pump. My pickup has been modified for my 10.5" deep pan so I want to reuse it. Thanks.
it should be dead on!
Al
__________________
“The bitterness of poor quality & Service remains long after the sweetness of low price is forgotten”
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