Accusump - pros & cons

[JGrossijr]

David Reher of Reher Morrison:
"One of the best investments a sportsman racer can make for a wet-sump engine is an oil accumulator such as an “Accusump.” An oil accumulator is a sealed cylinder that contains a floating piston. Pressurized air on one side of the piston forces a reserve supply of oil into the engine if the flow from the internal oil pump is momentarily interrupted. An accumulator works automatically and requires virtually no maintenance except regular cleaning. Unfortunately, accumulators are seldom seen in drag racing. That’s a pity, because they really work."
https://rehermorrison.com/tech-talk-...-engine-alive/

[CMcAllister]

Accusumps work well for their intended use. Cranking an engine before starting is still running parts together that may or may not be dry from sitting.

Cams, lifter bores, bearings and rocker gear with high spring pressures don't give a damn what class they are being used in.

Band aid or not, an Accusump can be useful with shallow, front sump, flat bottom pans and/or high G forces. Likewise, full oil galleys and oil where it needs to be before the engine is cranked does make a difference.

Don't like 'em, don't use 'em.

[1320racer]

Originally Posted by JGrossijr

David Reher of Reher Morrison:
"One of the best investments a sportsman racer can make for a wet-sump engine is an oil accumulator such as an “Accusump.” An oil accumulator is a sealed cylinder that contains a floating piston. Pressurized air on one side of the piston forces a reserve supply of oil into the engine if the flow from the internal oil pump is momentarily interrupted. An accumulator works automatically and requires virtually no maintenance except regular cleaning. Unfortunately, accumulators are seldom seen in drag racing. That’s a pity, because they really work."
https://rehermorrison.com/tech-talk-...-engine-alive/

So how many stock/super stock racers here engines are built by Reher Morrison? Answer...NONE! So you can quote DR but he's not good enough to trust with your engine. Hypocrisy at its best!

Nuff said

Originally Posted by JGrossijr

David Reher of Reher Morrison:
"One of the best investments a sportsman racer can make for a wet-sump engine is an oil accumulator such as an “Accusump.” An oil accumulator is a sealed cylinder that contains a floating piston. Pressurized air on one side of the piston forces a reserve supply of oil into the engine if the flow from the internal oil pump is momentarily interrupted. An accumulator works automatically and requires virtually no maintenance except regular cleaning. Unfortunately, accumulators are seldom seen in drag racing. That’s a pity, because they really work."
https://rehermorrison.com/tech-talk-...-engine-alive/

I think this pretty much sums it up. An engine builder only sees what the dyno tells them. The user sees G’s plus and minus with angle. As mentioned before hard braking can throw oil forward away from pickup and wheelies can do the same. So many combinations out there it just depends on the car and combination.
When used as a pre oiler after extended periods of sitting I think that's a great option all by itself. I don’t crank a motor after sitting for long periods , I remove the distributor and prime it. Some folks can get away with it, I can’t.

[1320racer]

wheelies and hard braking no problem, no accusump

Originally Posted by 1320racer

wheelies and hard braking no problem, no accusump

You also have a custom oil pan ( describe your pan) and priority oiling. Correct?

[1320racer]

I have an aftermarket moroso oil pan like thousands and thousands of racers, not custom and I have no greater "priority" oiling than a COPO, Drag Pak or Cobra Jet factory stocker has and most of them too do not use an accusump.

[1320racer]

stock block

[1320racer]

just a few of the thousands of stock and super stockers running without an accusump, some with engines built by some of the best, courtesy of Bobby's interviews...

Originally Posted by 1320racer

I have an aftermarket moroso oil pan like thousands and thousands of racers, not custom and I have no greater "priority" oiling than a COPO, Drag Pak or Cobra Jet factory stocker has and most of them too do not use an accusump.

Those are custom pans with priority oiling and basically Superstock from the factory! Not production stock parts. Factory race parts. Apples/oranges

Stock pans I’m talking. Copo , well thought out baffled race design from the factory not production stock parts required and yes you can modify