It doesn't seem to be public knowledge or common knowledge, but I'm curious who does what? Are the straight cut gears the only way to go? Can the 90 DSM oil pump gears work in an evo oil pump? Do the helical gears still work fine at 9000+ rpm and 800+hp?

Does anyone do any other modifications to the oil pump itself?

Do evos port the OFH like DSMs?

I did a bunch of searching and didn't find any decent information, not sure if it isn't out there or my search terms weren't proper

Thanks guys

 

X2

 

Bumping this because I too am curious as to what people are doing. Do the straight cut oil pump gears work for the evo oil pump? What other modificationa are suggested for 9k rpm and high hp evos?

 

Bump im all so interested

 

https://www.evolutionm.net/forums/ve...pump-gear.html
Here is one option

 

I was looking into this. seems like a good option other than its on backorder for a while and its pretty pricey.

 

straight cut gears do nothing but ad noise. side load on gears is not the problem. its the small shaft on oil pump drive that gets side loaded into the input housing. stiff valve springs. lightweight clutch assemblies, over tightened belts and possibly kevlar belts are most of the problem. a good polish and debur of the pump is about the best thing out to prevent. machined down balance shaft is waste of money as well and does zero to prevent.

 

I agree
Also I know it's common knowledge people also remove to balance shaft and try to find solutions to help eliminate the stub shaft options to get the most out of their oil pump (and assembly). However over time its been found out that it does cause premature wear with motor and clutch assemblies.

The stock oil pump is really good
I've taken it that high on previous Evos

 

Also if your really going to get on it at 9k all day
You'd probably want to run a dry sump

 

My car is primarily street driven and see's the drag strip a couple times a year. A dry sump is out of the question for me.

So are you saying the oil pump won't hold up to 9k rpm pulls for very long?

 

I've never had an oil pump failure, but with all the talk around about machined down balance shafts and straight cut gears, I always assumed the pump failures occurred at the drive shaft/balance shaft and not the drive shaft. Is this not the case normally?
Curious about the lightweight clutch assembly? Harmonics?

 

No
What I'm saying is for your driving the stock pump is fine for 9k

People that source alternate oil pumps are usually those at sustained 9k+ revs
Which is why I suggested previously that the stock unit is fine

I've been well above your revs an hp with a stock unit and had no failures

 

What are your guys thoughts on baffling the oil pan specifically around the pickup tube? Is something like the Buschur modified oil pan worth the money?

 

Baffling the pan and getting a crank scraper are worth it

But Buschur makes a good pan!

Your choice really

 

Thanks for the response. Buschur baffled pan and cosworth crank scraper ordered. Those combined with the Kiggly HLA should be good for what I need!