I would like to increase the oil pressure on my 86 truck a little. (5 -8#) Can someone give me an idea how much to stretch the spring or how many washers to install under the spring?

Thanks,
Rick

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

I dont think I would Trust streching the spring..

would it not give out when hot if stretched?

WHy not just get a new one - they are cheap and the same as 440 / hemi..

Also try one washer then try 2 if not enough..


Greg

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http://www.youtube.com/hyperpack

I don't want to get under the truck more than once & I want to do it tomorrow evening. So no time to order a spring. I found a post from DI that says an 1/8" nut is about what you want. I will give that a try and see what it does.

Rick

_________________
2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

That gives a good increase at the pump, when you pull the cap you might check the bore and piston to make sure its not pitted, stuck or the bore is somewhat smooth...

As an FYI...
Increasing relief valve spring pressure will not change hot idle oil pressure... A stiffer relief valve spring will only increase higher RPM oil pressure.
If you need more low RPM pressure... it is time to change oil pumps or figure-out where the pressure is going. (worn bearings or ??)
DD

Yep, doc is absolutely right.

I usually put 1-2 small washers in there to give 0.050-0.090" thickness between the cap and stock spring. I quit using the Mopar Perf spring because the pressure goes way too high. If you have at least 45 psi at higher RPM, I probably wouldn't touch it. You don't spin that thing over 5000, right?

Lou

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Home of Slant6-powered fun machines since 1988

if you want to go trick

you can use one of these

http://store.440source.com/Adjustable-O ... /200-1093/

I put one on the 83 D150

I did need to drill a hole through the passenger side motor mount to allow access with a allen to get to the adjustment stud. I tuned mine in to relieve at 60 psi.

Factory gauge (Low - High) has been reading a little low so I put an aftermarket gauge on it just to make sure what it had. And at idle it had 15# maybe a bit more, and at higher RPM it only has about 38#. It is just a bit lower than I would like to see, but it is not giving me any problems. This is a 35,000 mile engine and it will not see 5000 RPM ever.

Rick

_________________
2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6