I am building an H23 VTEC and am just brainstorming about how to build this motor for longevity. I know that upgraded oil pumps can increase the oil pressure and give better lubrication, but I was thinking:

Could simply adding some extra oil raise the oil pressure some, enough to give some extra pressure and give better lubrication?

The H23's have a tendency to spin bearings at high miles and sometimes when dogged out, so I'm thnking about tryin this out if it works, since I didn't have a chance to run looser clearances on the bearings.

 

No it wont increase the pressure just the amount available to the pump.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeyKrus &raquo;</TD></TR><TR><TD CLASS="quote">I am building an H23 VTEC and am just brainstorming about how to build this motor for longevity. I know that upgraded oil pumps can increase the oil pressure and give better lubrication, but I was thinking:

Could simply adding some extra oil raise the oil pressure some, enough to give some extra pressure and give better lubrication?

The H23's have a tendency to spin bearings at high miles and sometimes when dogged out, so I'm thnking about tryin this out if it works, since I didn't have a chance to run looser clearances on the bearings.</TD></TR></TABLE>

Bad idea, too much oil making likely you will churn up the oil, increase the chance you injest air into the pump and therefore increase the odds you will spin a bearing. If pressure is low fix the reason why its low. I.E. worn bearings etc.

 

There are a couple of theory's that you have to consider when thinking about this, but I don't believe that it would be enough oil pressure to make a difference if there was any. The first theory goes to the oil pump and uses it for the basis of oil pressure and since it is indeed a pump, it moves the fluid at a given rate which would not increase oil pressure. The other theory depends upon fluid weight and gravitational pressure. More fluid in a given area puts more weight on the oil at the bottom of the oil pan where the oil pick up is and should therefore increase oil pressure.

I think that in reality there is going to be a slight combination of the two theories. The pressure will be determined by the pump, but the higher initial pressure coming from the increased pressure on the oil in the oil pan will increase the amount of flow through the oil pump.

I personally don't think there would be a noticable difference, but if you do try it, be sure to get a larger oil pan.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by virginia_dude &raquo;</TD></TR><TR><TD CLASS="quote">

Bad idea, too much oil making likely you will churn up the oil, increase the chance you injest air into the pump and therefore increase the odds you will spin a bearing. If pressure is low fix the reason why its low. I.E. worn bearings etc.</TD></TR></TABLE>

How will a little extra oil cause the oil to churn up?

I was just thinking, b/c a guy told me how overfilling your oil is worse than underfilling b/c it produces extreme pressure and can blow lines.....and was wondering how true it was and if so, if it could be exploited.

And I don't have low oil pressure, I'm just using high oil pressure as a safeguard to prevent a spun bearing. Now to look into shipping the oil pump....

 

The extra oil can cause more windage which can give you more aeroated oil. Slightly overfilling or running a little low on oil won't cause pressure to increase. I agree with Kendall, if you want to put more oil in it get a higher capacity pan.

 

Having more oil in the pan will not increase line oil pressure, only crankcase pressure. That is why the seals will blow out.

Kendall: THe oil pump has to pick up the oil off the bottom of the pan because it is higher than the oil level is. So there is no inlet oil pressure to the pump.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FULLTHROTTLE &raquo;</TD></TR><TR><TD CLASS="quote">Kendall: THe oil pump has to pick up the oil off the bottom of the pan because it is higher than the oil level is. So there is no inlet oil pressure to the pump. </TD></TR></TABLE>

Thank you, I completely overlooked this point. It is therefore impossible to increase oil pressure by adding additional oil.

 

i dont know why would you want to increase oil pressure, stock for most NA applications is good....you dont need more.
If you want to avoid spun bearings, get the tolerances right

edit:i guess if you want more pressure you could shim the spring on the pump


Modified by mmuller at 8:44 PM 1/18/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeyKrus &raquo;</TD></TR><TR><TD CLASS="quote">How will a little extra oil cause the oil to churn up?</TD></TR></TABLE>You can overfill w/oil to the extent that it fills up to the bottom of the cylinders,and the spinning of the internal parts will churn up the oil like a egg beater.You can overfill w/oil slightly because when the engine is running the oil level drops a little,but just the amount that is moving thru the oiling system.