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  #31 (permalink)  
Old 12-06-2018, 03:06 PM
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Originally Posted by 65Vette View Post
Pulled the intake, couldnít really tell if the gaskets were leaking. But when looking into the intake ports, oil was literally pooled up on top of some of the closed intake valves. Does this indicate bad valve guides/seals?
That's a strong indicator that oil is getting down the guides. Then take system sees a lot of vacuum which will pull a lot of oil down the intake valve stems if the seals are worn and/or the the stem to guide clearance is too wide. The exhaust side sees a lot of heat and pressure which burns what oil gets down the guides but also the pressure tends to dry out the stem to guide interface which really accelerates wear on these parts.

Not that these are the only possibilities but are strong contenders. Another that has been mentioned is intake fit to the heads. Anytime the block has been decked, heads milled, or the engine has a combination of aftermarket heads,
block, intake, etc. the fit up can result in sealing problems with the intake to the heads. A common one being where the ports are leaking with the valley side, this pulls a lot of oil and is hard to detect unless the manifold vacuum is much lower than you would expect with the cam used.

Bogie

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  #32 (permalink)  
Old 12-28-2018, 04:25 AM
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I replaced the intake gaskets and fixed two corrosive ports on the intake which, hopefully, resolved the fact I had to add coolant periodically. Looked like it had been leaking there. Also this fixed some oil leaks on my garage floor. There doesn’t seem to be a mismatch b/t intake and heads. I also rebuilt the Holley and bumped up the primary jets which resolved the “trailer hitching” problem. It runs stronger than ever with lots of pulling power, but still uses a lot of oil. Again, it doesn’t smoke but occasionally, not very often, there will be a big puff of smoke on startup. Still can’t tell if it’s guides, seals, or rings. Guess I’ll just live with it for now since it’s running so good. It’s going to bother me though.
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  #33 (permalink)  
Old 12-31-2018, 09:48 AM
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It sounds like valve guides, have someone follow you, do a hard acceleration pull and back off the gas quickly, you will have your highest manifold vacuum at that time and whoever is following may see a puff of oil smoke out the exhaust. See if it is even on both sides. A set of valve stem seals may minimize it for a bit or you can have the heads freshened up.
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Old 01-02-2019, 04:01 AM
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Originally Posted by PHWOARchild View Post
It sounds like valve guides, have someone follow you, do a hard acceleration pull and back off the gas quickly, you will have your highest manifold vacuum at that time and whoever is following may see a puff of oil smoke out the exhaust. See if it is even on both sides. A set of valve stem seals may minimize it for a bit or you can have the heads freshened up.
Do you think bad valve guides & seals could be the cause of a quart of oil per 100 mile usage?
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Old 01-07-2019, 04:15 AM
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Yesterday I hooked up a vacuum gauge and there was rapid fluctuation between 15 and 20, indicating bad valve guides. Another tell tale sign...
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  #36 (permalink)  
Old 01-07-2019, 02:41 PM
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With synthetic oil, you may may not see any smoke, despite burning oil...

I noticed that back in early 1970's with a 2 stroke motorcycle... with conventional 2 cycle oil mix, it smoked noticeably, with synthetic oil mix, I didn't see any smoke, but with it being a 2 cycle, it had to still be using/burning oil...

A big cam is going to give you fluctuating vacuum readings at idle...
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  #37 (permalink)  
Old 01-07-2019, 04:50 PM
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I haven't read the entire thread here so forgive me if I cover ground already done.


The fact that it puffs on start up indicates that oil is leaking past the guides - that says that either the guides are worn OR the valve seals are shot. We don't run valve seals on our exhaust valves with the race motors as we want them to get some cooling from the additional oil but on the first start of the day, she's gonna kill a few mosquitoes.
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  #38 (permalink)  
Old 01-08-2019, 04:10 AM
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I do have a big cam, but Iím losing too much oil. A quart every 100 miles. When I took off the intake, oil was pooled on the intake valves and all inside the intake. I have good compression, average 143 psi. Not sure what to do. Do I have the aluminum heads refreshed? Is it the rings?
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Old 05-20-2019, 03:42 AM
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Okay, didn’t understand the PCV test Imsport was asking me to do, so I finally plugged the carb vacuum port and installed a breather in the valve cover where the PCV went, filled it with oil and drove 100 miles. There was marked improvement, oil was only down slightly. So too much oil is being sucked into the carb via the PCV system.
Now, what do I do about it? The valve cover has a baffle. Is there a different Valve I should use?
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  #40 (permalink)  
Old 05-20-2019, 04:06 AM
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Quote:
Originally Posted by 65Vette View Post
Okay, didnít understand the PCV test Imsport was asking me to do, so I finally plugged the carb vacuum port and installed a breather in the valve cover where the PCV went, filled it with oil and drove 100 miles. There was marked improvement, oil was only down slightly. So too much oil is being sucked into the carb via the PCV system.
Now, what do I do about it? The valve cover has a baffle. Is there a different Valve I should use?
Right here, but you might not like the price:
Dual Flow Adjustable PCV Valve – M/E Wagner Performance Products

How good is the baffle in your cover?? Just a flat plate shielding the hole, or more involved than that??
I've seen guys put a section of a brass "birds nest" type kitchen scouring pad below the PCV on top of a baffle in the cover to help...and there are baffled PCV grommets also that can help.

A third alternative is a catch can on the firewall to add a expansion chamber in the PCV line, this gets oil to drop out of the air steam and collect in the can.
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Old 05-20-2019, 08:51 PM
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Thanks for replying. Yes, that duel flow is a little steep. I took your recommendation and installed the Moroso baffle grommet and yes, the valve cover baffle is just a metal flap, so I also added a SS scouring pad and wired it in place on top of the baffle grommet. Hopefully this will resolve my problem.
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  #42 (permalink)  
Old 05-21-2019, 06:24 AM
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I'll have to remember that brass scouring pad next time I pull my new/old M/T covers with just home made flat plates for baffles.
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Old 05-21-2019, 07:30 AM
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I couldnít find brass, just something copper coated so I bought stainless steel.
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  #44 (permalink)  
Old 05-21-2019, 01:54 PM
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Quote:
Originally Posted by 65Vette View Post
Thanks for replying. Yes, that duel flow is a little steep. I took your recommendation and installed the Moroso baffle grommet and yes, the valve cover baffle is just a metal flap, so I also added a SS scouring pad and wired it in place on top of the baffle grommet. Hopefully this will resolve my problem.
Report back with results, please.
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Old 05-28-2019, 05:44 AM
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Good news to report after redoing the PCV system. Just got back from a 100 mile trip and the dipstick was only down a smidgeon, so happy! I was very close to pulling the heads and replacing seals. I would post a pic of what I did but can’t figure out how.
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