Whos Ever Played About With Oil Pumps?

[maxi 36 1 Cars]

I always ran a spacer in the oil pump in my old engine to give the pressure relief spring more tension, thus holding the valve shut for longer and as a result, the pump generating more pressure. I didnt mod the pump and it was smashed to pieces when the old engine threw a rod at about 6.5K RPM.

 

The question I want to know is, which end of the spring/ half of the pump did you place your spacer/washers in?? Would you sit them actually in the plunger/valve end, or would you place them at the other end of the spring that sits in the solid side of the casing. The solid end also has a plastic/nylon washer that sits withing the spring. My thoughts that this would get damadged if washers are behind it??

 

Anyone done this before or get any ideas?? I need all the oil pressure I can get! (It is a brand new, from peugeot, pump I am fitting)

 

Maxi

[C_W 3 1 Cars]

I would say its on the fixed end as the plunger is very closely matched the to the space it fills and needs to move smoothly to regulate the oil.

 

I thought about doing something like this with mine after buying the group N spring which is just longer spring which is therefore put under more tension. I'm sure putting a spacer at the back will have the same results.

[tom_m 0]

i've got a spare grp-n spring if you want it adam, was tempted to drop it into the turbo, but it sounds like your need is greater than mine!

[maxi 36 1 Cars]

I would say its on the fixed end as the plunger is very closely matched the to the space it fills and needs to move smoothly to regulate the oil.

 

I thought about doing something like this with mine after buying the group N spring which is just longer spring which is therefore put under more tension. I'm sure putting a spacer at the back will have the same results.

 

 

Even with the little nylon pluger that sits in the spring being in that end??

 

Tom, cheers mate, but if the spring is for an mi S16 have massively heavier rated springs in them as std so it would probably less pressure than a std pump!

 

Maxi

[DrSeuss 0]

I'm still confused? Aren't you having problems with blowing out seals under load? Yet you want MORE oil pressure?

 

Spacing out the spring should be done at the spring seat end, not the piston end.

[maxi 36 1 Cars]

I'm still confused? Aren't you having problems with blowing out seals under load? Yet you want MORE oil pressure?

 

Spacing out the spring should be done at the spring seat end, not the piston end.

 

 

The engine suffers from excess crankcase breather pressure. The engine suffers from lack of oil pressure, when revving it on load the top end becomes rattley. 2 different problems. More oil pressure will stop the rattling (which is being caused because my engine has the wrong pump, chain and drive sprockett). While putting a brand new pump in it I would be silly not to mod the spring for higher pressure.

 

Seuss, when you have modded them like this before has it worked fine with the plastic insert being in that end of the spring? Have you found it made a difference when you have modded them like this before??

 

Maxi

[DrSeuss 0]

When i stripped my 1.6 pump. There was no plastic insert as you describe (though i admit it was a while ago). I spaced the spring out with a couple of washers to give me marginally better oil pressure. I also noticed my old oil pressure spring was about 1-2 shorter then the brand new spring bought from pug.

 

It worked just fine. The main reason i did it this way was some swarf had jammed the piston in place giving me slightly low oil pressure throughout the rev range.

 

I think you risk the spring not seating properly causing the relief piston to jam. But there's probably little difference.

Edited January 16, 2006 by DrSeuss

[maxi 36 1 Cars]

When i stripped my 1.6 pump. There was no plastic insert as you describe (though i admit it was a while ago). I spaced the spring out with a couple of washers to give me marginally better oil pressure.

 

It worked just fine. The main reason i did it this way was some swarf had jammed the piston in place giving me slightly low oil pressure throughout the rev range.

 

I think you risk the spring not seating properly causing the relief piston to jam. But there's probably little difference.

 

 

Yeah its a strange one, dont know why it has this plastic insert.....

 

Did the gauge read much higher in the car once you had done the job??

 

Maxi

[DrSeuss 0]

No, it was very marginal, but around .5bar improvement. It only increased the peak oil pressure, no improvement elsewhere.

 

Could it be your fat cams are literally squeezing the oil out of your lifters?

[maxi 36 1 Cars]

No, it was very marginal, but around .5bar improvement. It only increased the peak oil pressure, no improvement elsewhere.

 

Could it be your fat cams are literally squeezing the oil out of your lifters?

 

 

Thats the initial thought I had but after speaking to a few others who run the same cams (Stew205 for one) they dont have problems with rattly lifters. They were brand new ones that went in there too!

 

Its definately low on pressure causing them to rattle....

 

Maxi

[Mattsav 1]

I still think all the problems lead to the oil level being too high and the crank churning the oil turning into froth at high rpm.

 

All the symptons are linked:

Excessive oil in the breathers and the oil pressure dropping at high rpm causing the followers to rattle (running on oil/air milkshake) and the car goes much faster when the oil level is showing low on the dipstick.

[maxi 36 1 Cars]

I still think all the problems lead to the oil level being too high and the crank churning the oil turning into froth at high rpm.

 

All the symptons are linked:

Excessive oil in the breathers and the oil pressure dropping at high rpm causing the followers to rattle (running on oil/air milkshake) and the car goes much faster when the oil level is showing low on the dipstick.

 

 

Yep, thats definately first on the blame list mate as we discussed!! I am not driving the car now until the bodies are on, I want that high BHP we designed it for!

 

I still think the new pump will help...

 

Maxi