Early PCV valve on model t
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Bmettli
Topic author - Posts: 73
- Joined: Thu Jan 17, 2019 8:46 pm
- First Name: Brian
- Last Name: Mettling
- * REQUIRED* Type and Year of Model Ts owned: 1922 touring, 1933 Dodge
- Location: Dayton, Ohio - Centerville
- Board Member Since: 2013
Early PCV valve on model t
Saw this on a fbook marketplace T truck for sale. Interesting homemade setup. But wonder why.
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RajoRacer
- Posts: 5171
- Joined: Sun Jan 06, 2019 12:18 pm
- First Name: Steve
- Last Name: Tomaso
- * REQUIRED* Type and Year of Model Ts owned: 1914 Touring, 1919 Centerdoor, 1924 TT C-Cab Express, 1925 Racer
- Location: Longbranch, WA
- Board Member Since: 2001
Re: Early PCV valve on model t
Not "home-made" - actual era accessory !
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RVA23T
- Posts: 834
- Joined: Sat Apr 02, 2022 8:27 am
- First Name: Richard
- Last Name: C
- * REQUIRED* Type and Year of Model Ts owned: 1923 Touring
- Location: Lake Country, Virginia
Re: Early PCV valve on model t
Must have been a California T! 
Everything works in theory.
Reality is how you determine if something works or not.
Reality is how you determine if something works or not.
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Kevin Pharis
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- Last Name: Pharis
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Re: Early PCV valve on model t
I ran a PCV on my speedster for years until recently… if you can seal up the crankcase it works wonders at controlling oil leaks!
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RVA23T
- Posts: 834
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- First Name: Richard
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- * REQUIRED* Type and Year of Model Ts owned: 1923 Touring
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Re: Early PCV valve on model t
What was the downside to using the PCV setup? I would think plug fouling and combustion chamber build up.Kevin Pharis wrote: ↑Sun May 05, 2024 12:07 amI ran a PCV on my speedster for years until recently… if you can seal up the crankcase it works wonders at controlling oil leaks!
Everything works in theory.
Reality is how you determine if something works or not.
Reality is how you determine if something works or not.
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TXGOAT2
- Posts: 7391
- Joined: Sun Feb 14, 2021 10:08 pm
- First Name: Pat
- Last Name: McNallen
- * REQUIRED* Type and Year of Model Ts owned: 1926-7 roadster
- Location: Graham, Texas
- Board Member Since: 2021
Re: Early PCV valve on model t
No downside, other than non-originality.
Using a positive crankcase vent arrangement can reduce oil leakage and prevent water and gasoline condensate in the crankcase. Oil mist escaping the oil filler will be reduced, leading to a cleaner engine bay. The oil mist will actually tend to reduce ring and valve stem wear. It will not cause any issues unless your rings are totally worn out, and it probably wouldn't then. The device in the picture appears to be a combination positive crankcase vent and intake air pre heater.
A modern type PCV connected to the intake manifold above the carburetor would do a better job. I don't know if the T carburetor would need to be modified to use one, but I don't think it would
Keep in mind that a positive system will pull more air than normal through the crank case, which is all to the good, but the air needs to be kept dust free by some means. With an older T, air would be drawn in where the throttle rod passes thorough the engine. On the late models, it would be advantageous to provide an air inlet by modifying the valve chamber cover or using an older model one with a hole in it.
Using a positive crankcase vent arrangement can reduce oil leakage and prevent water and gasoline condensate in the crankcase. Oil mist escaping the oil filler will be reduced, leading to a cleaner engine bay. The oil mist will actually tend to reduce ring and valve stem wear. It will not cause any issues unless your rings are totally worn out, and it probably wouldn't then. The device in the picture appears to be a combination positive crankcase vent and intake air pre heater.
A modern type PCV connected to the intake manifold above the carburetor would do a better job. I don't know if the T carburetor would need to be modified to use one, but I don't think it would
Keep in mind that a positive system will pull more air than normal through the crank case, which is all to the good, but the air needs to be kept dust free by some means. With an older T, air would be drawn in where the throttle rod passes thorough the engine. On the late models, it would be advantageous to provide an air inlet by modifying the valve chamber cover or using an older model one with a hole in it.
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SurfCityGene
- Posts: 681
- Joined: Wed Jan 23, 2019 3:00 pm
- First Name: Gene
- Last Name: Carrothers
- * REQUIRED* Type and Year of Model Ts owned: 1912 Torpedo Roadster
- Location: Huntington Beach, Ca
- Board Member Since: 1999
Re: Early PCV valve on model t
The late RDR Ralph Ricks had a PCV valve connected from the filler neck to the intake manifold on his PCup Great Race car. I was hardly noticeable and did have the Cal Smog approval I'm sure!
1912 Torpedo Roadster