StanleyRegister Posted October 30, 2023 Share Posted October 30, 2023 This 817 ci 4-cylinder was in the Thomas race car that ran the 1906 Vanderbilt Cup race. It was described as "inlet over exhaust," but the rocker arm angles make it look like the intake valves were closer to the piston than the exhausts. What you can see of the exhaust pushrod guides seem to be in line with the intakes, so it looks like a single camshaft. I don't think any production Thomas engine before or after looked anything like this. Does it resemble any other engine of the time? 3 Link to comment Share on other sites More sharing options...
1912Staver Posted October 30, 2023 Share Posted October 30, 2023 It looks like a single cam to me as well. I think the exhaust valves would be in the same position as on a T head with the intakes more over the pistons. So sort of 1/2 T head , 1/2 overhead valve. Interesting design. Link to comment Share on other sites More sharing options...
wayne sheldon Posted October 31, 2023 Share Posted October 31, 2023 "F" head? Link to comment Share on other sites More sharing options...
arcticbuicks Posted October 31, 2023 Share Posted October 31, 2023 yes likely like some british cars.....and early jeeps ? Link to comment Share on other sites More sharing options...
wayne sheldon Posted October 31, 2023 Share Posted October 31, 2023 Reo used an "F" head design for quite a number of years. Four cylinder cars during some of the 1910s, with open upper valve trains. And then for a number of years on six cylinder engines with covers over the valve mechanisms. Trucks and taxis (a couple of friends had one years ago) also used the open valve train four cylinder engines well into the 1920s. The Reo four cylinder, although much smaller than the Thomas engine, looks similar. I don't know if it is a single or dual camshaft, however I expect it would be a single camshaft given the cost advantages. Link to comment Share on other sites More sharing options...
arcticbuicks Posted October 31, 2023 Share Posted October 31, 2023 kaiser car Link to comment Share on other sites More sharing options...
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