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Can modern intake valves be used for exhaust in older engines?


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  #1  
Old 12-11-2018, 10:26:36 PM
flyguy5219 flyguy5219 is offline
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Default Can modern intake valves be used for exhaust in older engines?

So Im rebuilding a big 6 cyl gas crawler engine, 1925-1927 era. Max RPM is 1500.
Maybe 6/1 compression. Over head valves. Both intake and exhaust are the same at 1.875, 45 degree seat.
I can find diesel "heavy" profile head intakes with stems long enough to be custom cut to length but can't find the same in an intake specific.
So my question is.........
Can modern steel intake valves be used for exhaust purposes in place of the exhaust valves from that period??
I can mix in a "lead" additive in with the gas.
What do you guys think?
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Old 12-11-2018, 10:48:51 PM
NDmeterman NDmeterman is offline
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Default Re: Can modern intake valves be used for exhaust in older engines?

It would seem to me that exhaust valves are specifically made to handle the extremely hot gases exiting the cylinder, whereas only the face of the intake valve would have the capability to withstand the combustion temperatures, so I wouldn't be sure the rest of the intake valve could withstand the required temperatures.

Be sure to take my guess with a grain of salt, as the sum total of my hands-on experience with engines is one class in junior high...
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Old 12-11-2018, 10:57:22 PM
P. Kelly P. Kelly is offline
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Default Re: Can modern intake valves be used for exhaust in older engines?

I use modern small block Chevy exhaust valves in my Model T Ford motors. No problems. It's a common upgrade. I'm cutting down some IH TD-14 exhaust valves for my '25 Case 12-20 right now.
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Old 12-12-2018, 12:29:57 AM
ajs2744TC ajs2744TC is offline
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Default Re: Can modern intake valves be used for exhaust in older engines?

Simon's would know on that one. I would think with today's metallurgy that would be fine. I order valves from them and they get used for both intake and exhaust. Really not sure what the valves are he uses. Suspect there JD exhaust customer cut for TC fit.
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Old 12-12-2018, 12:31:42 AM
ulgydog56 ulgydog56 is offline
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Talking Re: Can modern intake valves be used for exhaust in older engines?

I use instead of lead in my older motors with the lead free gas, portect the valve seats
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Old 12-12-2018, 01:34:51 AM
flyguy5219 flyguy5219 is offline
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Default Re: Can modern intake valves be used for exhaust in older engines?

I imagine exhausts can be used for intakes but can the heavier diesel intakes be used for exhausts?
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Old 12-12-2018, 10:16:20 AM
Bill Hazzard Bill Hazzard is offline
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Default Re: Can modern intake valves be used for exhaust in older engines?

That will be fine. The exhaust valves in the gas engine were nothing special then, they would have been the same as the intakes. You can test them by doing a spark test with a grinder, if they intakes and exhausts spark the same then the material will most likely be the same.
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Old 12-12-2018, 10:34:13 AM
BHoward BHoward is offline
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Default Re: Can modern intake valves be used for exhaust in older engines?

I would agree with Bill. There should be no problem.
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Old 12-12-2018, 11:51:51 AM
G Willikers G Willikers is offline
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Default Re: Can modern intake valves be used for exhaust in older engines?

Quote:
Originally Posted by flyguy5219 View Post
Can modern steel intake valves be used for exhaust purposes in place of the exhaust valves from that period??
I can mix in a "lead" additive in with the gas.
This may be a little off the mark for this topic.
There have been in-depth discussions about the effects of unleaded gasoline on non-hardened valves.There never seems to be any conclusive answer.
There was one discussion, perhaps here on Stak, that suggested that one might notice damage in engines with valve rotators?
For most of us, we do not likely use the engines enough to create problems.
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Old 12-12-2018, 12:15:20 PM
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Russ Hamm Russ Hamm is online now
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Default Re: Can modern intake valves be used for exhaust in older engines?

We get some engines pretty warm here in the summer, no real problems so far but that's seldom very many hours. Im starting to forget a lot but I think intakes and exhausts interchange on Farmall regulars and F-20s and there are
a lot of them still working without damage.
I might add the center of the nation is considered Olympic in thriftiness, so
much alcohol blended gasoline gets burnt around here. I try to buy alcohol free gas, personally.
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