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Author Topic: Strange oil pressure problem  (Read 5411 times)

Reply #15February 08, 2011, 12:58:39 pm

rodpaslow

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Re: Strange oil pressure problem
« Reply #15 on: February 08, 2011, 12:58:39 pm »
Just to go with ROR, I have a 16V (not turbo) and at 2800 rpm I easily get 55-60 psi no problem.  I would assume the ratio is slightly higher.  Size of gear pumps are the same, but your not feeding a turbo either.

A long time ago, when I was a novice, I didn't (forgot to) add sealant between the piston oil coolers and the block in a 1.6 TD.  I had oil pressure issues similar to yours.  MY $.02. 
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Reply #16February 08, 2011, 03:47:02 pm

rabbitman

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Re: Strange oil pressure problem
« Reply #16 on: February 08, 2011, 03:47:02 pm »
Okay the verdict is in, the ratio of IM shaft vs. oil pump is 1:1. Of course since the IM shaft is driven by the back of the belt there will be a small (very small) amount of slip but that doesn't count.

So your drill running the oil pump was equivalent to 2200 crankshaft rpm.

I'd check the bolts and while you're in there take a look at the piston squirters and also make sure the oil pump screen is clear of goop.
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'82 Rabbit, I put on a euro vnt-15, 2.25" DP, 2.5" exhaust, the result.....it whistled.

I removed the turbo, made a toilet bowl 2.5" DP, the result....it was deafening. Now it has a homemade muffler up front and a thrush in the rear, the result.....less loud.
Watch: AGENDA, GRINDING AMERICA DOWN
Reply #17February 08, 2011, 10:45:23 pm

RadoTD

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Re: Strange oil pressure problem
« Reply #17 on: February 08, 2011, 10:45:23 pm »
I'll let you guys continue your ratio debate, and just quietly sneak in the fact that the bolt holding my intermediate shaft pulley on had worked loose and the pulley was slipping on the IM shaft. Would've had just enough friction to make 20psi at just about any rpm for a while which is what kinda threw me off

But please, carry on! My vote is that the IM pulley is twice the dia of the crank pulley and that the IM gear is very similar in size to the vacuum pump gear, leaving an overall ratio of 2:1. :)
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Quote from: R.O.R-2.0 on July 24, 2011, 11:57:45 pm
enough boost is when you have 3 dimple marks in the hood from the valve cover nuts..  ;D
Reply #18February 08, 2011, 10:47:40 pm

Powered by Spearco

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Re: Strange oil pressure problem
« Reply #18 on: February 08, 2011, 10:47:40 pm »
Wait. The IM pully is keyed. Is there a key in the pully still?
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Reply #19February 08, 2011, 10:58:55 pm

truckinwagen

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Re: Strange oil pressure problem
« Reply #19 on: February 08, 2011, 10:58:55 pm »
yeah, the pulley should have a keyway keeping it from spinning regardless of how tight the bolt is( would have to fall off to disengage from the shaft and spin freely)

-Owen
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Reply #20February 09, 2011, 07:46:09 am

RadoTD

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Re: Strange oil pressure problem
« Reply #20 on: February 09, 2011, 07:46:09 am »
dang.. uh.. I'd better find myself a key for that pulley...

I was wondering about that, thinking it should need a key. Must have missed it during assembly.

Is it a square or half moon key?
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Quote from: R.O.R-2.0 on July 24, 2011, 11:57:45 pm
enough boost is when you have 3 dimple marks in the hood from the valve cover nuts..  ;D
Reply #21February 09, 2011, 07:53:30 am

theman53

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Re: Strange oil pressure problem
« Reply #21 on: February 09, 2011, 07:53:30 am »
IIRC I think the IP pulley is a piece of keystock *square* and the IP has the woodruff key *half moon* as soon as you pull it off you should be able to see clearly though.

I just looked at my turned down IM shaft pic and to me it looks like it is a half moon woodruff key on it. So I was incorrect before.
« Last Edit: February 09, 2011, 07:55:49 am by theman53 »
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Reply #22February 09, 2011, 12:05:18 pm

rabbitman

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Re: Strange oil pressure problem
« Reply #22 on: February 09, 2011, 12:05:18 pm »
Quote from: RadoTD on February 09, 2011, 07:46:09 am
dang.. uh.. I'd better find myself a key for that pulley...

I was wondering about that, thinking it should need a key. Must have missed it during assembly.

Is it a square or half moon key?

Both half moon.
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'82 Rabbit, I put on a euro vnt-15, 2.25" DP, 2.5" exhaust, the result.....it whistled.

I removed the turbo, made a toilet bowl 2.5" DP, the result....it was deafening. Now it has a homemade muffler up front and a thrush in the rear, the result.....less loud.
Watch: AGENDA, GRINDING AMERICA DOWN
Reply #23February 09, 2011, 12:06:40 pm

rabbitman

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Re: Strange oil pressure problem
« Reply #23 on: February 09, 2011, 12:06:40 pm »
Quote from: rabbitman on February 08, 2011, 03:47:02 pm
Okay the verdict is in, the ratio of IM shaft vs. oil pump is 1:1.

Of course, in your case it was variable ;D
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'82 Rabbit, I put on a euro vnt-15, 2.25" DP, 2.5" exhaust, the result.....it whistled.

I removed the turbo, made a toilet bowl 2.5" DP, the result....it was deafening. Now it has a homemade muffler up front and a thrush in the rear, the result.....less loud.
Watch: AGENDA, GRINDING AMERICA DOWN
Reply #24February 11, 2011, 05:00:53 am

smutts

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Re: Strange oil pressure problem
« Reply #24 on: February 11, 2011, 05:00:53 am »
Good save by RadioTD, my other half would have kept going, red lights, buzzers, regardless, at least till seizure. ;D
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