High Volume Oil Pump BAD for the Engine?

[High PSI]

While I've got the oil-pump out for the balance shaft removal I figure I'll do a mini-rebuild and replace a bunch of the high milage parts on my car while they're out. One of these parts is the oil pump. I'm a big fan of replacing anything I pull out with a higher performance part, so I was looking at a Toga High Volume oil-pump to replace the stocker.

However, someone mentioned a good point. What if the oil pump supplies oil faster than it can drain back down? Is there any risk of pump starvation with a high volume oil pump on a 4g63? I'm sure the inconsistant oil pressure and frothy oil wouldn't be a good thing... :thumbdown

 

[TSIfreek]

While I've got the oil-pump out for the balance shaft removal I figure I'll do a mini-rebuild and replace a bunch of the high milage parts on my car while they're out. One of these parts is the oil pump. I'm a big fan of replacing anything I pull out with a higher performance part, so I was looking at a Toga High Volume oil-pump to replace the stocker.

However, someone mentioned a good point. What if the oil pump supplies oil faster than it can drain back down? Is there any risk of pump starvation with a high volume oil pump on a 4g63? I'm sure the inconsistant oil pressure and frothy oil wouldn't be a good thing... :thumbdown

With the balance shafts removed and oil holes in the block blocked off you will have more oil presssure than you need!!! I would just get a new front cover and pump assembly. I see the only reason if any to get a high volume pump for our motors is if you have a big ass oil cooler on it. Spend you money on other parts that will improve on your goals for your car.

 

[96blacktalon]

but if he isn't having the squirters in the block plugged, should it be a problem? i'm having the toga put onto my block being built right now. had the BS removed, but left the oil squirters intact. that shouldn't create too much pressure right? thanks

 

[TSIfreek]

I just think its a waist of money

 

[RipperXX]

While I've got the oil-pump out for the balance shaft removal I figure I'll do a mini-rebuild and replace a bunch of the high milage parts on my car while they're out. One of these parts is the oil pump. I'm a big fan of replacing anything I pull out with a higher performance part, so I was looking at a Toga High Volume oil-pump to replace the stocker.

However, someone mentioned a good point. What if the oil pump supplies oil faster than it can drain back down? Is there any risk of pump starvation with a high volume oil pump on a 4g63? I'm sure the inconsistant oil pressure and frothy oil wouldn't be a good thing... :thumbdown

I wouldn't remove that balance shaft! Just put a kevlar belt on it and forget about it.



A local respected DSM shop which has a few 500-600whp DSM's recently stopped removeing the balance shaft after they had major oil pump failures useing the CORRECT shaft & parts.

Just a warning of caution though do what you want it's your car.

 

[DSMu4ia]

I wouldn't remove that balance shaft! Just put a kevlar belt on it and forget about it.



A local respected DSM shop which has a few 500-600whp DSM's recently stopped removeing the balance shaft after they had major oil pump failures useing the CORRECT shaft & parts.

Just a warning of caution though do what you want it's your car.

What is this respected DSM shop you speak about?

 

[High PSI]

I wouldn't remove that balance shaft! Just put a kevlar belt on it and forget about it.



A local respected DSM shop which has a few 500-600whp DSM's recently stopped removeing the balance shaft after they had major oil pump failures useing the CORRECT shaft & parts.

Just a warning of caution though do what you want it's your car.

Correct shaft meaning what - the Mirage stubby shaft or the shaved stock balance shaft? I realize that there is slightly more pressure on the oil pump gear due to the unsupported weight of the stubby (and NO more pressure using the shaved stocker), but considering that mitsu used the stubby on many of the other 4g63 variants with no common known problems, I wouldn't think it would be an issue.

I've never heard of anyone having problems after removing the balance shafts, but after searching through the posts I found a few people who had problems with either the belt going out or the bearings themselves. I think this is a case of damned if you do, damned if you don't. :thumbdown

 

[High PSI]

With the balance shafts removed and oil holes in the block blocked off you will have more oil presssure than you need!!! I would just get a new front cover and pump assembly.

I'm not blocking off the oil holes, nor am I removing BOTH balance shafts. I'm just removing the rear one and getting rid of the front belt, so my pressure won't be much higher at all.

What's the advantage of a new front cover? Does this thing really wear out?

 

[Strm Trpr]

Well, since you have the front case off, and you have the oil pump opened up, you can see the orientation of the oil pump gears.
There is an inspection that you can do to make sure the gears are not wearing into the case. In my Haynes manual,
it says to lay the case on a flat surface with the oil pump cover removed. Leave gears in place,
and lay a straight edge across both gears on both sides of the gear centers.
Then measure with a feeler gauge between the straight edge and the face of the gears.
This measures how much wear the front case has from the gears floating on a thin film of oil in the front case.
If you have high mileage on your engine, then it might behoove you to install an entirely brand new Mitsu Front Case.

 

[High PSI]

With the balance shafts removed and oil holes in the block blocked off you will have more oil presssure than you need!!! I would just get a new front cover and pump assembly. I see the only reason if any to get a high volume pump for our motors is if you have a big ass oil cooler on it. Spend you money on other parts that will improve on your goals for your car.

I think the Toga high volume oil pump replaces the front cover (what else could it be for a little over $200....just the gears??). If I remember correctly, the front cover with the gasket and seals is about $150 at Mach V. As long as the oil pump actually increases performance or reliability, I think it's worth it.

Besides, there isn't really anything I can do with $50 to improve my car that I haven't already done.

 

[R3dR]

I have the toga, with no balance shafts and left the squirters in.

My pressure at the top of the head is just fine, I have my mech oil guage at the top of the head to moniter the oil going into my gt14.