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What could cause this? Update

 
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Ballaholic29414
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PostPosted: Wed Jun 03, 2009 3:58 pm    Post subject: What could cause this? Update Reply with quote

Small amounts of oil blowing from the back of the intake behind the distributor. It was doing that before I changed the head gasket and still after I changed the head gasket. It doesnt leak on the ground it just sits on the block when the tranny and block connect. It was also coming up the distributor but we put silicon around the gasket and that stopped it. I packed some more silicon around the back of the intake before I went to the track last week and that slowed the leak down, but what could be causing this?
I do have a Crankcase Evacuation Kit.

It only does this at high rpm because I only see it after I make a pass.

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Last edited by Ballaholic29414 on Mon Jul 20, 2009 12:55 pm; edited 1 time in total
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af2
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PostPosted: Wed Jun 03, 2009 4:35 pm    Post subject: Reply with quote

I never use the supplied front and rear gaskets on any Chevy intake. A thick bead of silicone works every time. If you have a leak you know it wasn't thick enough. 1/4" bead works. Wipe off the excess and they will think you own an Olds! Shocked Laughing
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Ballaholic29414
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PostPosted: Wed Jun 03, 2009 5:09 pm    Post subject: Reply with quote

af2 wrote:
I never use the supplied front and rear gaskets on any Chevy intake. A thick bead of silicone works every time. If you have a leak you know it wasn't thick enough. 1/4" bead works. Wipe off the excess and they will think you own an Olds! Shocked Laughing


I used a thick bead of silicon. Could restrictive mufflers also cause this problem?

I called the guy I bought the motor from and he said he didnt have any problems with oil blowing out from the intake. (I bought this motor turnkey with distributor installed. The only thing that I can think of right now is maybe my Moroso spiral flow mufflers are too retrictive.
This motor has 750 to 800hp.

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clay
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PostPosted: Wed Jun 03, 2009 7:59 pm    Post subject: Reply with quote

I'm assuming you're talking about a header style evacuation kit. I don't know how well those work with mufflers. You could do a quick test by installing a "T" in the header evacuation line and see if you pull vacuum or build pressure while going down track. Only other thing that should affect crankcase pressure is the valve cover arrangement but it sounds like those didn't change. You might just be lucky like me and there is nothing wrong, it just decided to start leaking right after you bought it. Try the vacuum gauge though - it might show something. Clay
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lun40119
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PostPosted: Wed Jun 03, 2009 8:14 pm    Post subject: Reply with quote

I tried a header evac setup with a 2.5" flowmaster exhaust, and it spit the dipstick tube out. Pulled the hoses off, and put in a regular breather, and all was well. I wouldn't use those with mufflers. Good call Clay. I still have the headers with the bungs welded in them, if anyone wants them Laughing
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10sec.et
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PostPosted: Wed Jun 03, 2009 9:20 pm    Post subject: Reply with quote

af2 wrote:
Wipe off the excess and they will think you own an Olds! Shocked Laughing

Laughing thats funny, i actually DO wipe off all the silicone that squeezes out so it doesnt look like a bunch of boogers hanging out.

the crankcase evac aint gonna work with mufflers. is this a street/strip car or track only ? if its street/strip, a PCV valve does wonders.

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Ballaholic29414
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PostPosted: Wed Jun 03, 2009 9:52 pm    Post subject: Reply with quote

10sec.et wrote:
af2 wrote:
Wipe off the excess and they will think you own an Olds! Shocked Laughing

Laughing thats funny, i actually DO wipe off all the silicone that squeezes out so it doesnt look like a bunch of boogers hanging out.

the crankcase evac aint gonna work with mufflers. is this a street/strip car or track only ? if its street/strip, a PCV valve does wonders.


Its a race car.

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Knarley Darley
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PostPosted: Wed Jun 03, 2009 10:14 pm    Post subject: Reply with quote

I think the mufflers are to small and that is where your E.T. went. You can do a quick test of your evac system by pulling the hose off at the valve cover, put your finger over the end of the hose and rev the engine. You can feel if it has pressure or vacuum. If it has pressure then for sure the mufflers are causing back pressure and are too small in diameter.
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Ballaholic29414
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PostPosted: Wed Jun 03, 2009 11:08 pm    Post subject: Reply with quote

Knarley Darley wrote:
I think the mufflers are to small and that is where your E.T. went. You can do a quick test of your evac system by pulling the hose off at the valve cover, put your finger over the end of the hose and rev the engine. You can feel if it has pressure or vacuum. If it has pressure then for sure the mufflers are causing back pressure and are too small in diameter.


Im gonna order new collectors tomorrow with the bong on it. You know I tried to see if it has pressure or vacuum and I felt vacuum, but it didnt seem like it was enough to get any kind of performance gain and was like wtf.

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Ballaholic29414
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PostPosted: Mon Jul 20, 2009 12:56 pm    Post subject: Reply with quote

Took the mufflers off and the leaking stopped
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