hi

i am having a weird oil pressure problem on my 383. its brand new, cola crank, eagle rods, JE pistons. moroso anti-cav pump, stock oil pan.

Everything is fine, cept that if I rev it out to say 5k (not even full throttle, just 1/4 throttle) and let off, oil pressure drops to zero - and stays there- for several seconds. oil pressure comes up instantly on cold start, and it always ok just cruising around. it is also ok under braking (ruling out the pickup falling off, which i welded anyway)

if I just rev it un netural, its fine. so it seems to be either acceleration or load based.

the whole motor is new.

any ideas???? I am about to drop the pan and check stuff out...

 

my guess is the pickup tube

 

Check basics:
Oil level
assuming your baffels work proparly in the pan
Then pump tube as the other guy said...if that ok
If everything is draining back to the pan ok then...somewhat rare but your not sucking the pan dry are u. My machinist said sometimes when they ran a big block pump on a small block it would suck the pan dry...

 

1st establish correct oil pressure and DO NOT run the car untill you know for sure, drop the pain check the pickup etc.

 

Did you check how far the pick-up is from the bottom of the pan?

 

do u have a high pressure pump? if so u can be draining the pan?

 

my guess was going to be the pickup tune to pan distance, but its odd it doesnt do it when just reving in gear.

I guess maybe the oil demand for the motor increases with load?

 

Cam bearings, been there, done that.

 

Do you have a windage tray or did you toss that and now you are running the stock pan without the stock tray or a aftermarket one....

If you add oil it will make the problem worse, or a high volume pump. Just put a windage tray back in there if it's not now and the problem will be solved.

Bret

 

Aye, chalk up another for cam bearings. I just went thru that.


P

 

How many miles does it have on it?

 

Motor has like 5 miles on it, all brand new(including cam bearings)

no windage tray, standard vol pump,

 

Put the tray back in and look for any silver and copper spects in the pan while ya got it off.

 

Stock pan? If so oil could be climbing rear of pan if thats the case you need the moroso piece that goes between oil pump and block. It acts like a dam preventing oil from climbing under acceleration.

 

BINGO! and it's a stock pan to boot probably.

Throw even the stock cheap windage tray in there and you should solve that problem, it's not cam bearings unless the cam was out of spec for journal size.

Bret