oil pressure what's to low

[gtm1086]

Just fired up the new rebuild. First a run down on what has been done.

late model block. bored 0.30 over. balanced. ARP rod bolts, new oil pump, FSPP dual timing chain and gear. cam 268/274, FSPP harmonic balancer. Head has been reworked stiffer springs. Mallory dual point distributor going to a HYfire ignition system. Holey two barrel carb.

The motor fired right up after checking for leaks and checking the oil pressure it was at 40 psi I bumped the engine speed upto 2000 rpm to run in the cam. After about 15 minutes the oil pressure had dropped to about 25 psi. Shut the engine down and checked a few things. Started up. set idle speed checked timing. at idle the engine shows around 25 off idle it comes upto around 40psi. If I remember right my old engine allways ran around 40 psi. Pulled valve cover there is good oil flow on the rocker shaft and there are no strange engine noises.

Can't quite drive it yet as I'm waiting for the new FSPP valve cover so that I can rig up the new throttle cable.

Also installed on this overhaul. T-5 and a 8"rear with 3.25 gears

 

[powerband]

I take it you're not going for MPG and detuning anyway. Definitely check for gross problems and meanwhile drive it - You'll quickly find out if those good parts you put in there (nice stuff) are OK. Revving a hot six to less modest limits delivers torque by stressing those parts.

Most of the engines I've had grenade didn't fit the profile. Low RPM crank failure, spontaneous cam failure with good oil pressure and light loading. RPM accelerates bearing wear from balance problems. The improved breathing, valvetrain and 7 main bearings work together.

9.5 CR on "Worked" D7 Head . 5200 big jets on Stovebolt adapter, Hooker Duals to Turbo's with Dump Valve/3.03 3OTT/ 3.5Rr, $20.oo Interior/Lets Roll!/

Powerband

 

[gtm1086]

:roll: Nope not to concerned about fuel econ. I'm still a bit concerned about the oil pressure though, sure don't want to destroy any of the new parts before I have a chance to enjoy them

 

[AzCoupe]

Here's a really good article that does a great job covering oil pressure and trouble shooting. http://www.cquesttechnologies.com/fspp/OilPressure.asp

The first things I would try - replace the oil filter, reprime the pump, and check the pressure sending unit. All cheap and easy. Next, drop the pan and clean the screen, inspect the pump (and bearings), and check screen to pan clearance. However, 25 psi at idle isn't to bad, especially since it comes up to 40 psi off idle. But it can't hurt to give it a once over.

Valve covers should be ready soon, I'm calling them in the morning to see if they are done. Have a couple pans I'm waiting for too.

 

[gtm1086]

Hello Mike.
Thanks for the link. I knew I had seen something on oil pressure somewhere. I think I will try a different filter first. From what I have read 25psi at idle isn't bad I just don't want to take any chances.

Other than the oil pressure the engine sounds great good idle at 800 rpm. anything lower than that it gets real rough.