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new motor with excessive blow-by

 
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jhyjohnson
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Joined: 30 Oct 2005
Posts: 129

4780.54 points


1973 Buick Apollo

PostPosted: Mon May 12, 2008 8:31 pm    Post subject: new motor with excessive blow-by Reply with quote

finally got the new motor fired. after fixing all the leaks i let it run from between 1500 and 3000 rpm for about 20 minutes (what i was told by the engine builder) to break in the cam. i took it in the street and just ran it maybe a mile total, getting it a little hard a few times but very short bursts. park it and pop the hood and find oil sprayed on valve covers and intake. pcv line is ran behind the alternator for now it was dripping and the oil breather was soaked. the builder told me that after the cam break in to go beat the hell out of the motor ( his words). thinking that the rings maybe not seated. maybe just run it about 20 to 30 miles cruising to break them in? calling the builder in the morning, just wanting some opinions tonight. thanks
350 bored .060over
flat tops
lunati cam 268
patriot heads 190cc 2.05/1.60
victor jr. intake
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af2
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Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Mon May 12, 2008 8:59 pm    Post subject: Reply with quote

Find a hill and coast in gear down it.
That has smoked out the neighbors and broke the rings in.

I did it twice while in high school and it worked both times.
I knew the rings were the problem both times though.

As long as it wasn't getting washed with fuel.
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Paul P
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Location: Townsend, Mass.
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1971 Chevrolet Chevelle

PostPosted: Tue May 13, 2008 6:41 am    Post subject: Reply with quote

Are you using a synthetic oil? If you are the rings will not seat properly.
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William Jones
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1971 Ford Mustang

PostPosted: Tue May 13, 2008 7:33 am    Post subject: Reply with quote

If the cam is broke in already I use a straight 30w oil with no detergents to breakin pescky rings. This has worked for me in the past.

Bam

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jhyjohnson
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Joined: 30 Oct 2005
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1973 Buick Apollo

PostPosted: Tue May 13, 2008 9:21 am    Post subject: Reply with quote

using 15w/30 rotella diesel engine oil. was told its better for the flat tappet cam. its about 20 miles from my work shop where the car is to my house. guess i will bring it home today and cruise the back roads to finish breaking it in. this motor is driving me crazy.
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FRITODAVE
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Location: Victoria, KS
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1969 Plymouth Barracuda

PostPosted: Tue May 13, 2008 9:24 am    Post subject: Reply with quote

I don't think the rings are broke in. I think they are broke! Either that or a piston. I seen one time where one guy put five quarts in a new engine and went home before starting it. The next day another guy put five more in. Smoked like hell.
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clay
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Location: South Carolina
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1972 Chevrolet Nova

PostPosted: Tue May 13, 2008 9:39 am    Post subject: Reply with quote

I agree with FritoDave, something sounds bad wrong. Rings not seated will have blowby sure, but you are describing something much worse it sounds like. Compression and leakdown tests would be my next course of action. By the way, the Rotella used to be better for flat tappets, but EPA changed all that in 2007, so start looking into either a racing oil or some sort of additive. Clay
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jhyjohnson
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Joined: 30 Oct 2005
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1973 Buick Apollo

PostPosted: Tue May 13, 2008 10:21 am    Post subject: Reply with quote

there is no smoke. just blow-by.
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squeeezer
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Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Tue May 13, 2008 11:28 am    Post subject: Reply with quote

second ring upside down???????

didnt some butchers put in commet or equivalent in their motors to break in pesky rings??????old school b.s.

+1 on the leakdown test

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robins44
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PostPosted: Tue May 13, 2008 7:45 pm    Post subject: Reply with quote

ya second that on the rotella, comp cams makes a cam break in additive that is 10$ a bottle works great. I have the lunati 60103 cam, i believe it is the same one you got and it says to break in cam with striaght 30Wt! Hope this will help you out a bit.
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jhyjohnson
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Joined: 30 Oct 2005
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1973 Buick Apollo

PostPosted: Tue May 13, 2008 8:02 pm    Post subject: Reply with quote

talked to the builder today and he said that the rings probably havn't seated. he said doubt it be broken ring. so i drove car home today 18 miles. ran fine 165degrees all the way. good oil pressure 68lbs cruising. checked oil when i got home and still full. didn't notice any blow-by now or anymore oil on top of motor. going change oil one more time and put in some kind of racing oil. going put a few more easy miles on it before i turn it loose. guess i'll buy a compression tester to be on the safe side.
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10sec.et
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Joined: 29 Mar 2006
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Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Tue May 13, 2008 8:16 pm    Post subject: Reply with quote

jhyjohnson wrote:
ran fine 165degrees all the way.


was this the temp during break-in ? if so, that may be why the rings didnt seat well. you need some heat when you seat the rings. 165 is not hot enough.

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jhyjohnson
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Joined: 30 Oct 2005
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1973 Buick Apollo

PostPosted: Tue May 13, 2008 8:53 pm    Post subject: Reply with quote

yeah got a 165 stat in it. should i get a 195 and run it for awhile?
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue May 13, 2008 10:10 pm    Post subject: Reply with quote

i would go with a 180. typically (depending on ambient temp) an engine will stabilize at 180 to 200 degrees regardless of what stat is in it. it just takes a lot longer to get there with a cooler stat. if your engine doesnt get time to warmup then you need a hotter stat.
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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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