Hello everyone i am going to be rebuilding my engine for HIGH hp soon and was curious who recommends replacing the oil pump (around $200) for safety purposes ....the car has 8500 miles on it . I want to hear from peoples who have failed and/or people with lOTS of hp...thanks again. I know AL at dynoflash had his pump go out on him once.
Dave

 

Well, "while your there"...

 

To a higher volume unit? It doesn't make sense to replace it with another stocker.

 

the stocker can push the needed oil for 600-700whp fine...its just that it won't last 100k i think is the deal. AL , AMS, TURBOTRIX i believe all run stockers.

 

I definitely would. You never know what contaminants could be in there from the previous motor.

 

If you had no problems with the one in there now then dont bother. 8k miles is nothing for an oil pump. If you had a failure like wiped bearings or metal in the oil of some sort then I would definetely recommend one. HP level means nothing to an oil pump, what defines the need for something with higher pressure would be higher rpms, sustained hard driving (roadracing), etc. The stock one puts out more than enough pressure and volume for our engines. Remember that it is already a high volume pump since the Evo comes with a factory oil cooler.

 

if the evo's oil pump is already a high volume unit suited for 700-800hp, what could you possibly upgrade to?


what companies make bolt on oil pumps for our cars?

 

I do not think that you need to replace the pump, have you had a chance to take a 4G63 apart and look at it? All it is is a set of gears in a small housing that bolts to the front cover of the block. I will try and take a few pictures if I can. Actually, take a look at this thread..

https://www.evolutionm.net/forums/sh...d.php?t=120668

In the picture you can see a shaft with a gear on it and a threaded end on the other side. Now, this oil pump obviously had a problem with lubrication, but if you read the post this is most likely not the fault of the pump itself. Anyway the shaft goes through the hole right below it and a sprocket bolts on to the end which is turned by the timing belt. This gear meshes with another gear and push or forces the oil to flow between them which creates the oil pressure. In other words, this is a very simple operation, there is really not a whole lot to go wrong here. While you can replace the input gear if you want, and you can remove the balence shaft and thus replace it with a stub shaft (which will have the other gear that the input shaft you see engages, and I would recommend dumping the balence shaft), that is all that the oil pump is comprised of. There is no separate box or little box with a pump in it per se. The only thing that you could do to help the oild pump capacity that I know of would be to go to an external oil pump, be it either wet sump, or a dry sump system. If you are dead set on a different oil pump system then you may want to talk to racerferrari as I believe that he changed his oiling setup for heavy duty track use.

And I do not even know if you would have to replace it if the motor came apart. You would DEFINATLY have to take it apart and thouroughly clean it to get any metal bits and shavings out, and I mean using a part cleaner or similar that has a constant rinse to wash the bits out, if the gear themselves have not suffered damage nor the bearing races that the shafts turn in, then the pump should be fine. But if it makes you feel better or you will always worry about it, then by all means just replace it.

 

i don't really want to replace it . Its just that i was recommended to by some people thats said its worth it rather than ruining my new pauter rods, arais pistons and all the other stuff i am putting in let alone the head work. I agree about the balance shaft removal ...i need to know where there is a kit (who has one ...any links?) . Anyway if i take it apart and do a balance shaft removal kit there really won't be much left anyway right....as long as all the gears look good and everything is in good working order it will be fine? Does it have bearings and if so can they be replaced?

 

I'm with superz. Just measure the clearance in the gears - highly unlikely they are worn, 8K is nothing for an oil pump. It's worked for 8 iterations of Evo, why second guess the Mitsu engineers?

 

I'd do it just to be on the safe side. A little money now to save you from major headaches later. Also why the hell not? If i know you (and i think i can take a hint) youll probably be pushing 700whp before you know it whether or not the stocker can or cannot handle that much power wouldn't so much be the main issue for me, its mainly the idea that hardly anything else in the car is stock and needs to be built for HIGH hp levels and constant abuse. I would just to rest a little easier.

 

yeah i agree...i did just put in a big mocal oil cooler system also....its prolly worth it regardless. I don't wanna hurt the car i am spending a bunch of money on to be bulletproof. The car has about 4,000 of being 450whp daily and about 3,000 miles before that of being a stg4 so it gets its workout. I am going to go for mid 10s at 135+mph or around there or whatever i can do and keep it reliable so i think i will just do it anyway...lol I was hoping a big fast vendor with a big fast evo would chime in here....oh well

 

What I would hate to risk is replacing a perfectly functioning pump with one that may or may not work (defective). To me, that's more of a risk.... I think the only value to changing parts to a functioning system that will the power you intend to push, is to go dry sump.

 

waste of 200$ to replace a pump with 8500 miles on it.

 

I was referring to the fact that your already there, have invested time and money. Why not replace it with a new OE unit? Sure an OE pump will provide adequate performance... I don't believe that was ever a point of discussion. It is an issue of "peace of mind".