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Old 05-21-2013, 05:46 PM
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671 weiand Blower problems

I have a 671 weiand blower on a built 350 with all forged internals that are basically stock in a 65 chevlle Malibu. I'm have problems with oil in between the blower and manifold gasket it's only wet on the back half of the gasket and not sure what is going on with it. It was under driving with the pullys and I just swapped them around to make about 15 pounds of boost took it out around the block and had lots of oil on the drive way when I got home this is the only place I can tell the oil is coming from.

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Old 05-21-2013, 05:52 PM
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Are you planting 15lbs into the crankcase and blowing oil everywhere?

Pictures please!
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Old 05-21-2013, 06:02 PM
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It's about 12 pounds it what every thing I have read told me. No pics at this time the cars at my dads with the blower off of it.
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Old 05-21-2013, 06:08 PM
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It have a new forged rotating a year ago, 5.7 rods, 8/1 compression a 487/487 lift .500 @ 234 across 109 int 119 ext for a cam
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Old 05-21-2013, 06:50 PM
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Not sure with the information you're providing? Are you using 80-90W gear oil in the blower? Are you using thick gaskets and did you check the surface of the manifold prior to installing the manifold surface? You may want to check the breather system on the engine as well.
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Old 05-21-2013, 07:10 PM
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Yes what they called for is what is in the blower. Every thing was new and had and had nothing in between it it was fine now it's just the back half of the gasket is wet and the oil in the front is still full. The gasket is about a 1/8 inch thick it was the original one that came with it. It has evac system on it from the breathers to the exhaust.
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Old 05-22-2013, 10:48 AM
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Where exactly is the oil? I am having a hard time following what you are saying (probably just me). Are you talking about the blower to blower intake gasket or the manifold to cylinder head gasket?
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Old 05-22-2013, 11:03 AM
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Blower to blower gasket every thing else looks fine
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Old 05-22-2013, 12:21 PM
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There is no place for oil to come from up there. You have oil in your front cover area and that's it. The rear bearings are sealed. I would look for other sources for the oil/leak. Oil sending unit, back of the valve covers, etc..

You saw 15lbs of boost just going around the block? You should only see max boost at WOT and under a load.
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Old 05-22-2013, 12:32 PM
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My blower was and is still leaking 90wt. though not as bad as before the overhaul. I had it rebuilt by a west coast big name company. $250 shipping plus nearly a grand to rebuilt with new seals, bearing etc. The 90wt soaks through the gasket and stains the intake. All the oil goes down hill to the rear following the down tilt of the engine. I pressure tested it to no avail. The rebuilder said he would re-do it if I paid for shipping. I sent it in with this problem to begin with. I suspect a crack that opens up when it gets hot. I will take it apart myself this fall.
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Old 05-22-2013, 01:22 PM
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Hoses to the exh won't work on a street car. Evac sys won't work good until you get to 3500 or 4000 rpm and then it's not great.
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Old 05-22-2013, 01:40 PM
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90wt oil?
you said "lots" oil all over the driveway
you fill it a fingertip length below the plug in housing.
you could not possibly fill it with that much 90wt...or did you?
I asked for pictures right off the bat, to clear up confusion , camman it is not just you.
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Old 05-22-2013, 02:26 PM
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Correction about evac on a street car..... I have them on mine and they work great. I have no smoke out of the breathers at idle and it pulls the gases out of the engine going down the road. I used clear hose to see if it was working and it is working fine. I have the 2 breather/separators on the drivers side and 2 fresh air breathers on the passenger side. It is always pulling fresh air through the engine.
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Old 05-23-2013, 04:35 PM
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I have a friend here that also runs a Pan Evac system on the street.
On his car, it does work.

But:

1. It is a very radical full race engine.
2. It idles well above 1000 rpm
3. the exhaust system is very low restriction and really LOUD. "race mufflers"
4. Barely street legal.
5. Very limited street use.

Most of the time on anything you could consider streetable, that uses a full exhaust system with mufflers that is reasonable quiet,, a Evac does not work well at idle. Especially with a low idle speed.
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