Low head
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Joe Bell
- Posts: 1174
- Joined: Thu Feb 21, 2019 1:20 pm
- First Name: Joe
- Last Name: Bell
- * REQUIRED* Type and Year of Model Ts owned: 24 Fordor
- Location: Tiffin Ohio
Re: Low head
I asked that once and they told me yes.
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Wayne Sheldon
- Posts: 4249
- Joined: Sun Jan 06, 2019 3:13 pm
- First Name: Wayne
- Last Name: Sheldon
- * REQUIRED* Type and Year of Model Ts owned: 1915 Runabout 1913 Speedster
- Location: Grass Valley California, USA
- Board Member Since: 2005
Re: Low head
Generally yes. However, some higher compression pistons are higher than others. There were variations in the original head castings for several reasons. Couple those with some people mill more off of heads than is really wise in the futile belief that that extra 1/8 inch really makes a difference?
So check for fit BEFORE bolting the head down. Place the head on the block without any gasket, and make sure pistons and head do not hit! If it clears fine without a gasket, it should be okay bolted tight with the gasket.
I did see one once that someone did not check it first? Turned out one of the pistons near the center hit the head when they tried to run the starter. Ruined the center main. And probably the crankshaft?
So check for fit BEFORE bolting the head down. Place the head on the block without any gasket, and make sure pistons and head do not hit! If it clears fine without a gasket, it should be okay bolted tight with the gasket.
I did see one once that someone did not check it first? Turned out one of the pistons near the center hit the head when they tried to run the starter. Ruined the center main. And probably the crankshaft?
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Kerry
- Posts: 1447
- Joined: Mon Jan 07, 2019 2:42 pm
- First Name: Frank
- Last Name: van Ekeren
- * REQUIRED* Type and Year of Model Ts owned: 1916 touring, 1916 pick-up, 1924 coupe, 1926 touring, 1927 touring
- Location: Rosedale Vic Australia
Re: Low head
I've fitted several sets to early T engines with no issues, always found ample clearance in the combustion chamber.
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speedytinc
- Posts: 4725
- Joined: Fri Feb 12, 2021 12:24 pm
- First Name: john
- Last Name: karvaly
- * REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
- Location: orange, ca
- Board Member Since: 2020
Re: Low head
Agree with all of this.Wayne Sheldon wrote: ↑Thu Oct 28, 2021 10:12 pmGenerally yes. However, some higher compression pistons are higher than others. There were variations in the original head castings for several reasons. Couple those with some people mill more off of heads than is really wise in the futile belief that that extra 1/8 inch really makes a difference?
So check for fit BEFORE bolting the head down. Place the head on the block without any gasket, and make sure pistons and head do not hit! If it clears fine without a gasket, it should be okay bolted tight with the gasket.
I did see one once that someone did not check it first? Turned out one of the pistons near the center hit the head when they tried to run the starter. Ruined the center main. And probably the crankshaft?
I did this to keep the stock appearance on a 14. Milled an extra .100" off the head. More is not always better. Pistons needed trimming on the non valve side. 95# compression. It runs great, but not as well as I expected for the extra compression. It the law of diminishing returns with compression. Going from 4:1 to 6:1 is a hugely,noticable improvement. going from 6-7, not much. Would not do it this way again. IMO The extra milling didnt seem to gain that much?? The size & inefficiency of the valve chamber is the issue IMO. IMO stock pistons & a Prus head is a better way to go for performance/efficiency IF you dont NEED the low head look.
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BarrettR
Topic author - Posts: 62
- Joined: Thu Aug 26, 2021 3:45 pm
- First Name: RogerA
- Last Name: Barrett
- Location: Sacramento, ca.
- MTFCA Life Member: YES
Re: Low head
Where is the Prus head available?
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speedytinc
- Posts: 4725
- Joined: Fri Feb 12, 2021 12:24 pm
- First Name: john
- Last Name: karvaly
- * REQUIRED* Type and Year of Model Ts owned: 14/15 wide track roadster. 23 touring, 27 roadster pickup, 20ish rajo touring
- Location: orange, ca
- Board Member Since: 2020