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


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  #11  
Old 12-12-2018, 05:21:07 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Can modern intake valves be used for exhaust in older engines?

Back when that engine was built, they did not have 'Tetryl Ethyl lead in the gas. No reason you can't use 'modern gas as far as mechanicals go. What you have to watch for id the E-10 crap gas reacting with disimilar metals in the carb (Brass, Iron, and Aluminum or zinc), if a cork float, the alky eating off the shellac sealer on the float, and the alky eating up any rubber fuel system componants (fuel lines, pump diaphragm, float needle seats etc).
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Old 12-12-2018, 09:05:30 PM
flyguy5219 flyguy5219 is offline
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Default Re: Can modern intake valves be used for exhaust in older engines?

I bite the bullet and run only 92 octane alcohol free gas anyway......but all my tractors are 1933 and older and there aren't any rubber parts in the fuel system...thank goodness.
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Old 12-12-2018, 09:28:41 PM
Oilpulled Oilpulled is offline
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Default Re: Can modern intake valves be used for exhaust in older engines?

Oilpulls run fine on: fuel oil, diesel, kerosene, gasoline, E-10, E-15, E-85 & E100 & methanol. I've tried all.
I note that the gasoline improvers like "Heat" contain methanol and one contains isopropyl alcohol.
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Old 01-01-2019, 07:13:34 PM
DTurner DTurner is offline
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Default Re: Can modern intake valves be used for exhaust in older engines?

I would suggest that the head have steel valve seats install to be able to use unleaded fuel . New valve guides also ,engine will run great 👍🏿 Good luck
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Old 01-01-2019, 09:00:25 PM
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Default Re: Can modern intake valves be used for exhaust in older engines?

Tetraethyllead has been added to gasoline since 1921 as an Octane Booster allowing for higher and higher compression ratios.

That Being Said, your 1925-1927 Crawler Engine most likely Doesn't Need the lead to control detonation, and running at 1500 max rpm wouldn't have High Enough Valve Spring Pressures to need any lead there either.

Modern Valves, Even the Intakes, are made of much higher quality materials that what was available in the 1920s and should work fine for Both Intake And Exhaust in an older engine, especially a low speed one with much lower compression than what we now run. IF you're concerned about valve seat wear without lead, it would be the hardened seats you'd be looking at installing, but again, I wouldn't be concerned about it with a mid-20s crawler that isn't earning its keep on a daily basis.

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Old 01-02-2019, 12:49:01 PM
Thaumaturge Thaumaturge is offline
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Default Re: Can modern intake valves be used for exhaust in older engines?

Don't know what they cost, but sodium filled valves are available. https://www.supertechperformance.com...ve%20-tp126444
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