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tom thorn 09-02-2012 03:35:31 50.49.228.152 Report to Moderator	hi i have a farmall h distillate engen i just overhauled i took 90 thou of the head dose anyone know what the compresion should be and what was this fuel distillate thanks ih54 . [Reply]   [No Email]
Janicholson 09-02-2012 07:23:55 96.24.99.126 Report to Moderator	Re: farmall h in reply to tom thorn, 09-02-2012 03:35:31   .090 is substantial, However the head (assumption) being distillate had a lower compression than a gas only head. The amount of compression increase is totally dependent on the reduction in CCs of chamber volume. Calculating that depends on some math. With flat top pistons I would guess it to ne at 110 to 115. (very wild guess) The distillate fuel was produced by refineries in the early and mid 1900s. It is heavier than gasoline in viscosity, far less refined, and because was a residual from then used cracking methods, cheap. It has much less knock resistance, and requires higher manifold and combustion chamber temps to stay in vapor form to be combustible. The vapors condense out on engine metal and get into the crankcase. This dilutes the engine oil and as a result daily drain down of old oil, and the addition of fresh is necessary. The shutters and heat shields and manifolds, Plus minor carb modifications and two fuel tanks complicated the issue. The engines make about 90% of the power of gasoline (some say more than that, But I think it is wishful thinking). Cheap and available non taxed fuel was the reason it was popular. Petroleum cracking and catalytic processes have made it, and diesel fuel with reduced sulfur, more expensive than gasoline. It is actually not available commercially. Jim [Reply]  [No Email]