• Welcome to SAU Community

    Welcome to SAU Community, like most online communities you must register to view or post in our community, but don't worry this is a simple free process that requires minimal information for you to signup. Be apart of SAU Community by signing in or creating an account.

    • Start new topics and reply to others
    • Subscribe to topics and forums to get email updates
    • Get your own profile page, build reputation and make new friends
    • Send personal messages to other members.
    • See fewer ads!

    Consider joining our newsletter for the latest content updates

    Click here to register


Recommended Posts

Tomei oil pump failures

I tried searching but ran across the spline drive oil pump conversions and hadn't really heard bad press about the Tomei oil pump until then. I read about ONE failure so far and the thread did not provide Tomei's resolution to the pump issue so I'm curious if this is actually a potential problem or not.

I have a Tomei pump and am curious if anyone has seen one broken and under what circumstances. I'm limiting my car to 8k, but I do bang the limiter quite frequently and was just thinking about going a bit higher soon. Some say the cause of failure is oil cavitation from temporarily starving the pump (which means a dry sump would be the only real cure), and some say it's simply the 2-flat-drive stock pump orientation that kills oil pumps. I'm looking for actual evidence if possible because I'd like to live the rest of my engine's life in a happy state of knowing the chances of oil pump failure are very slim.

Patrick

Share this post


Link to post
Share on other sites

If that Tomei pump failure was with the spline drive fitted then there lies your answer. They will not tolerate any misalignment and will load the driven gear radially and also fretting/galling on the splines. 

Nitto wrote a good answer somewhere on here why they will not release a spline drive yet due to reliability issues.  

You have the stroker crank with full width pump drive I guess, what sort of balancer are you running. I've been running a  1000hp ATi for a long time now, and when I pulled it all down for some checking last year it was all good with minimal wear thanks to ATI, but no limit bouncing here.  .

However if you like bouncing on the limiter a bit then something will eventually give ...dry sump it and you can bounce of the limiter all day long :devil: 

Share this post


Link to post
Share on other sites

I have never heard of a Tomei pump failing (which is not to say it doesn't happen). If you fit oil restrictors when you fit the pump and you overfill the sump by a litre OR preferably have an enlarged sump there is no reason why your pump should starve (i.e. a dry sump is not mandatory).Stop limiter bashing. Raise the limit on your ecu (I assume you have an aftermarket one) and put a stop under you accelerator pedal or adjust the limit stop (depending on your set up) to limit the revs.

Share this post


Link to post
Share on other sites

How would a stopper under the pedal limit revs?
 

Anyway, if it goes over 9000 that gives you another 1000rpm before you hit the limiter, just don't limiter bash it.

 

  • Like 1

Share this post


Link to post
Share on other sites

I do have Tomei head restrictor, Greddy Sump (Which the Tomei tells you quite clearly you shouldn't run in some of it's settings without a larger sump), and N1 block (which has larger drain ports back to the pan), also mine's baffles and rear "drain" if anyone cares about that anymore. And I'm on the Fluidampr balancer (seems really nice).

Also yes Haltech...I hit the 2 step limiter when launching everytime but if I spin the tires the car racks out so fast in first that it hits the limiter quite quick on top. It IS a soft touch limiter though which at least isn't as hard as a hard cut. I'll bump the revs to 8500-8700 and use Haltech to output a shift light and try to just stay off of it. But yes thanks for the info. Also I do have the Haltech reading oil pressure and use the "engine protection" feature to put it in limp mode when it senses oil pressure low or high out of range.

I'm not sure the guy was spline drive, but I ran across the thread (not on this forum) after someone asked me if I had converted mine to spline drive.

And yes BC billet stroker crank. Engine runs really smooth with the balancer, crank, heavier nismo coppermix, etc.

Thanks!

Share this post


Link to post
Share on other sites

They have in some cases become oval and caused binding and lock up of the oil pump. Nothing to do with Spline Drive. We do however have Spline Drive upgrades for most pumps and the theory they bind due to crank flex is just a myth. Both ourselves Supertec and Spool have been selling these for the past 4 years. Zero gear failures reported to date for our kits.

 

 

C56E711E-FA3A-4E79-89F7-294A0BF02C53.jpeg

Edited by Frracer

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now