Ok people. I need some help.
Last night I went to Irwindale Ca, to run in a 1/8 mile. (Mods are in my SIG) During the burn out my car seemed to be making good power. 60 ft times were 2.02. More than Halfway down the 1/8 mile track. My car starts to fall on its face. And I have Oil splashing on my engine.
OIL SPLASHING ON THE ENGINE: I think I found the source of the oil leak. There was a lot of oil all over the place and it seems like the oil was coming out of the breath cap that I have installed. I pulled it off and I noticed the oil was staurated with. A friend of mine told me that maybe im getting TOO much oil at the top end and its causing a over load. (Can anyone verify this statement). He told me that I can stick some stuff in the push rods to slow the oil.
LOOSING TOP END?: This is the 4th time this has happen. Other times I thought I was out of gas and I wasn't. Going into this race I made sure that gas was in the car. And it still fell on its face.
QUESTION #1: Before I switched to a 383 stroker it was a 355. And I never had any of these issues. Is it possible that I may need to upgrade my fuel pump or something. Because it feels like im not getting any fuel at the top end. That is the only thing that I can think on why it would fall on it's face.
QUESTION #2: Should a stock fuel system LT1 be ok for a 383 even though things were fine with the 355?
Thanks people
Chris
mjtcst2004@yahoo.com

 

Dont put anything in your pushrods. What oil pump are you useing? How does it run after your pull down the strip? Does it continue to act up? Is the car throwing any codes?

 

Who built your engine?

 

TO RICH:Im using a High Volume Oil Pump (meiling). After I get done with my run everytime my motor has stalled out. As far as codes. I have not ran a dignostic on it yet but I,m going to. My buddy is going to let me borrow a data master or something and take it around the corner to log data.

TO SS MPSTR:
I built the motor. I bought the HOW TO BUILD AN LT1 engine book and followed it exactly. As far as internal, I'm sure everything is holding up just fine. I dont hear any clacking or and signs of spun bearings or anything. My car is making good oil pressure as well.
Chris

 

do you have a tune in your car?

 

Yes. but not a dyno tune. I know that is the way to go but I dont have the funds for that right now. PCMforless has been doing my tune for me.
Chris

 

You might be over flowing the top end. Usually this will cause it to smoke not just kill it self. I could see it causing the oil to spill out to. What RPM is it dieing at?

 

Do you mean you pulled the breather off and the valve cover was full of oil, or pulled the valve cover off and the head was full of oil, or do you mean you looked at the oil and it was saturated with "something"?

Is the PCV system functioning correctly?

 

Injuneer.
The breater cap that I pulled off its described as a Red Cone shape with what appears to be screens or filter of some sort. That is what was soaking with oil. Which lead me to believe that the pressure under WOT was high enough to squirt oil all over the place. At least that is what im thinking. ALso just wondering. with your 381 what kinda of fuel pump are you using? is it stock? Is the stock Fuel pump enough for a 383.?
Chris

 

Stock valvecovers? If not do they have baffles where the breather is? A stock car with an unbaffled valvecover with a breather in it will do that.

WHat size injectors?

Cats on the car?

Pressure regulator?

Stock fuel pump will be ok for a NA 383 like yours, injectors will not.

DOes the car shut off or bog down?


David

 

Fastboy. WOW!! dude. Your right about the valvecover issue I think this may be that problem. I have stock valved covers. I guess my dumbazz took that pipe that lead to the TB off and just slipped in a Breather. It does not screw in or anything it just slides right on in. No screws or nothing. SO basically I can just slip that off when ever I want too. I was doing some research on baffles and I noticed that the kits came with screw in type stuff. So its suppose to be screwed in. So everyone can save me a lecture on that one? Now. back to the part were my car falls on its face and the fuel pressure. I have stock injectors. and stock pump. And after the 1.8 mile and 1.4 mile the car has shut off as soon as I get off the gas.
Chris

 

There is a baffle on the stock passenger side valve cover under the hole where the little plastic elbow goes.

Its full of oil because the oil can't return to the crankcase fast enough. Could be too much volume for the drain holes to handle, or in an extreme case, there might be enough blowby in the crankcase that the oil is trying to flow one way through the holes in the head and the excess blowby is trying to flow in the opposite direction.

I run dual 205 LPH Bosch fuel pumps, one in the tank that will support the engine at 500 flywheel HP, and a second pump off a sump at the back of the tank that only runs when the nitrous system is armed. I suspect the stock pump will be strained to support 500 flywheel HP. Is it rated at something like 165 or 185 LPH??? I don't know.

 

Fred how about too much oil in the motor? Its a long shot in the dark but I thought I may ask.
About three weeks ago I had a oil leak coming from the rear. I traced the source and pulled off the intake manifold and fixed the sending unit pipe. It was waay loose. After the fix my pressure was not reading the normal presure. I watched my oil pressure gage drop. I added oil and my gage returned to what it was orginally reading, which at idle is 30-40 psi. If I added too much oil would it over flow?
Chris

 

Where was the oil on the dipstick? Too much oil, and you'll be making froth in the oil pan at high rpm. That will usually cause a loss of oil pressure. Not sure what the combination of a high volume pump and aerated oil would be doing. Check the oil level.

 

Thanks for the info you all!!
Chris