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Topic Review (Newest First)
06-23-2013 05:19 PM
bygddy Small edit here, running with the breather and pcv off, no smoke from the valve covers at all, at any rpm. And backing it into the garage, I noticed it is smoking at idle, but grey black more then anything, hopefully all this stressing is for nothing and its all Carb related. Will try another one this week and see what i have.
06-23-2013 04:39 PM
bygddy
Quote:
Originally Posted by techinspector1 View Post
Another thought I had was to bolt on a block-off plate to replace the carbutetor. The plate would be drilled, tapped and fitted with a Schraeder valve (tubeless tire valve). Back off all valves so that all combustion chambers are tight. Low-pressure (5 psi) smoke could be admitted to the intake and seen coming out the oil dipstick tube if there was a leak from the manifold to the crankcase.
That might be something simple I can put together at the shop this week. I was out today in it, and had wife behind me, at cruising speeds, or gentle accel from a stop its fine, zero trace of smoke, but anytime I lean on it hard, or even hit it hard while idling in park, as soon as I lift off the throttle there's smoke, 2 seconds later its gone again. So would that rule out rings or valve seals in your opinion? After really taking a look at it today yes, its got a very slight blue tinge to it, but its more grey smoke then anything. I'm almost wondering if its Carb related more then oil. The fuel guage sending unit in the cell was gummed up with stuff and wouldntbread until I took it apart and cleaned it, it sat a long long time with stabalizer in the fuel, and I'm wondering if some residue is in the Carb causing issues.
06-23-2013 02:03 AM
techinspector1 Another thought I had was to bolt on a block-off plate to replace the carbutetor. The plate would be drilled, tapped and fitted with a Schraeder valve (tubeless tire valve). Back off all valves so that all combustion chambers are tight. Low-pressure (5 psi) smoke could be admitted to the intake and seen coming out the oil dipstick tube if there was a leak from the manifold to the crankcase.
06-23-2013 12:43 AM
bygddy
Quote:
Originally Posted by techinspector1 View Post
Any overhead valve V engine is subject to sealing, or not sealing, in the same manner.

I haven't thought much about how to detect gasket gaps at the head/manifold interface. What if you introduced a thick smoke into the crankcase through the oil dipstick tube and cycled the motor over slowly by hand with a socket on the crank bolt? Seems that if you took all the spark plugs out, the cylinder(s) that is (are) oiling would emit smoke from the spark plug holes. Yes? No?

I'll bet the majority of motors out there are not sealed up like they should be because it isn't something that we have been paying attention to.
That sounds like it might make sense. I guess I will bring it to work Monday, we do have a smoke machine there.
Was hoping it was just valve seals lol.
Thanks for the input Richard
06-22-2013 11:49 PM
techinspector1
Quote:
Originally Posted by bygddy View Post
I wasn't sure if the vortec style intakes were at the same risk for gasket issues as a standard style intake. Is there anyway to accurately test this before i break out the sawzall to try and the dist and intake out? It really doesn't look like much fun in an S10 lol.
Any overhead valve V engine is subject to sealing, or not sealing, in the same manner.

I haven't thought much about how to detect gasket gaps at the head/manifold interface. What if you introduced a thick smoke into the crankcase through the oil dipstick tube and cycled the motor over slowly by hand with a socket on the crank bolt? Seems that if you took all the spark plugs out, the cylinder(s) that is (are) oiling would emit smoke from the spark plug holes. Yes? No?

I'll bet the majority of motors out there are not sealed up like they should be because it isn't something that we have been paying attention to.
06-22-2013 10:26 PM
bygddy
Quote:
Originally Posted by techinspector1 View Post
What did you expect him to tell you, the truth?

When L31 heads and aftermarket cam are mentioned in the same post, I begin wondering about whether or not the builder actually prepared the heads for more lift or not. I'd be pulling a spring off an intake valve to inspect the seal and see if it's been smashed into submission by the underside of the retainer or not.

No. 2 possibility....oil rings not installed correctly.

No. 3 possibility....intake manifold not sealed to head ports, motor sucking in oily vapor from crankcase on intake stroke.
They are summit racing heads, and had an additional bill from the machine shop for porting after initial porting.

I wasn't sure if the vortec style intakes were at the same risk for gasket issues as a standard style intake. Is there anyway to accurately test this before i break out the sawzall to try and the dist and intake out? It really doesn't look like much fun in an S10 lol.
06-22-2013 10:12 PM
cobalt327 You can get some idea of whether a valve guide seal isn't sealing by first marking a sparkplug w/a sharpie while still installed in the head so you know the orientation of it in the head. Once you pull the plug, look at the center porcelain to see if there are oily deposits on one side only. If there is, look to see what valve it's pointing to.

A leaky intake gasket would be high on my list too.
06-22-2013 09:35 PM
techinspector1
Quote:
Originally Posted by bygddy View Post
I spoke to the previous owner and he swears it wasn't using oil at all.
What did you expect him to tell you, the truth?

When L31 heads and aftermarket cam are mentioned in the same post, I begin wondering about whether or not the builder actually prepared the heads for more lift or not. I'd be pulling a spring off an intake valve to inspect the seal and see if it's been smashed into submission by the underside of the retainer or not.

No. 2 possibility....oil rings not installed correctly.

No. 3 possibility....intake manifold not sealed to head ports, motor sucking in oily vapor from crankcase on intake stroke.
06-22-2013 09:24 PM
bygddy
Burning oil?

OK, so as it says, I'm burning oil, at idle its fine, no smoke or anything, same as start up, all good there. But under accel its smoking, blue smoke, def oil. It runs fine. But I'm concerend. Checked pcv, it is baffled and on the rear pass cover.
I lent my leakdown tester to a buddy who is away for a few weeks so I don't have access to one currently. I spoke to the previous owner and he swears it wasn't using oil at all. But he never really drove it. It had a sealed valve cover on the drivers side until i bought it and put a breather in. The motor is fresh, less the 1000 miles on it. Could it have been hurt running without the breather? It was assemnled 2 years ago then sat parked for the most part. Could that effect anything? Do vortec heads have the same difficulty sealing intake gaskets internally? What things can I look for to try and diagnose for now?
The motor is
383, eagle rotating, KB pistons
Vortec heads with some bowl work and clean up
Performer RPM cam 234/244 @.050
488/510
Air gap intake (summit version)
Summit 750VC Carb
Long tubes
HEI
Oh and I just installed a timing double roller chain and removed a noisy gear drive. It went on fine, but i can actually hear the chain when its running. It has an billet cover and have been told they make everything sound louder?
Could I have possibly screwed anything up there that could cause the oil burning issue?

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