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Valve seals
Posted by: Willt65 ()
Date: June 23, 2020 06:42PM

I am taking my heads apart, and before reassembling, I have a question. I only had the seals on the intake valves, why do they say not to install them on the exhaust valves? I have rocker arm lubrication in my valve covers for each rocker, I have heard that when doing this you should also add seals to the exhaust valves.
Should I do that? Thanks for your expert advice!!!


Will Teeter
Flintstone, MD
65 Corsa project
66 Monza parts car
49 Chevy 5 window project
08 Chevy 2500
13 Honda Odyssey
07 Honda 919
04 Honda Rancher
05 Honda Forman
96 Honda XR400R

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Re: Valve seals
Posted by: MattNall ()
Date: June 23, 2020 06:45PM

Have you been cunsuming oil with current setup? Then add them

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Valve seals
Posted by: Willt65 ()
Date: June 23, 2020 06:49PM

Not enough time on setup to tell, was just wondering why many say not to install seals on the exhaust?


Will Teeter
Flintstone, MD
65 Corsa project
66 Monza parts car
49 Chevy 5 window project
08 Chevy 2500
13 Honda Odyssey
07 Honda 919
04 Honda Rancher
05 Honda Forman
96 Honda XR400R

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Re: Valve seals
Posted by: MattNall ()
Date: June 23, 2020 06:52PM

Horizontal valve doesn't get much oil.

MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: Valve seals
Posted by: steve c goodman ()
Date: June 23, 2020 06:54PM

No vacuum on exhaust so no pull into combustion chamber. Worse is wiping oil from exhaust valve stem which needs the lubrication

best wishes, Steve
Rear Engine Spec. Inc. Golden, Colo.

1962 spyder 3.0L turbo---1965 Crown V8
1967 monza 110/4---1968 monza 110/4
1971 amante gt 110/4
CORSA/RMC/PPCC/V8 Registry

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Re: Valve seals
Posted by: Willt65 ()
Date: June 23, 2020 06:58PM

Thanks!!!


Will Teeter
Flintstone, MD
65 Corsa project
66 Monza parts car
49 Chevy 5 window project
08 Chevy 2500
13 Honda Odyssey
07 Honda 919
04 Honda Rancher
05 Honda Forman
96 Honda XR400R

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Re: Valve seals
Posted by: davemotohead ()
Date: June 24, 2020 09:25AM

When the intake valve opens the piston is on the down stroke and sucks the fuel in, the seal on the intake valve is to keep too much oil from being sucked past the valve guides and into the combustion chamber. The exhaust is being blown out of the exhaust ports, when the exhaust valve opens there is pressure not suction on the exhaust valve guide so no oil is being sucked into the combustion chamber, its OK for a little exhaust to push past the exhaust valve guide, Remember the Valve guides need oil to operate without galling, if you put seals on the exhaust valve it cuts off its lubrication.







1960 4dr sedan caveman car
1961 Rampside (Chetside)
1962 Rampside (Barnside)
1962 Short Rampside (Shortside)
1962 Monza 700 Wagon
1963 Monza 900 coup (General Nader)

-----------------------------------
Rust Free Lancaster Ca

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Re: Valve seals
Posted by: v8vair ()
Date: June 24, 2020 10:03AM

I respectively disagree, We are no longer in the 60s. Modern valve stem seals work as one way valves, when the valve opens it lets oil in, when closed it keeps the oil in the guide and doesn't ( on the exhaust ) let it get blown back in the valve cover. On a performance engine even the slightest overlap can have oil sucked back into the chamber without a seal.
Of course as we know, the no seal has worked for years yet the guides still seem to wear ?
There's 4 corvair race cars that have had exhaust seals now for the past 4 years with no issues

1965 Crown V8 Racer
1964 Bill Thomas Monza Replica Racer
1964 Spyder Street Car
1979 Mazda RX7

Mike Levine

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Re: Valve seals
Posted by: v8vair ()
Date: June 24, 2020 10:28AM

Oops, 5 corvair racers use exhaust seals now

1965 Crown V8 Racer
1964 Bill Thomas Monza Replica Racer
1964 Spyder Street Car
1979 Mazda RX7

Mike Levine

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Re: Valve seals
Posted by: Willt65 ()
Date: June 25, 2020 05:56AM

Thanks for the info!!!! Much appreaciated! Great to know I can count on help from so many corvair experts! Wish I had that when I first put the engine together, It probably wouldn't be on the stand right now if I had!


Will Teeter
Flintstone, MD
65 Corsa project
66 Monza parts car
49 Chevy 5 window project
08 Chevy 2500
13 Honda Odyssey
07 Honda 919
04 Honda Rancher
05 Honda Forman
96 Honda XR400R

Options: ReplyQuote


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