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Discussion Forum
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Type of gas to use in D-17?

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David in IA

08-06-2000 21:40:16




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Should I be adding lead or other additive to the gasoline for my '64 D-17 Series IV? The manual mentions 91 research octane, or something similar.

I've run maybe a half-tank of premium unleaded thru (92 octane R+M). The tractor acts like it's running on the lean side (a little choke seems to smooth the engine sound a bit and improve power output). Before I go adjusting the carb main jet, just want to make sure I'm not goofing up with my choice of gas, in particular unleaded.

And how about gas with Ethanol? Here it's cheaper (and higher octane) than gas without.

Thanks,
Dave

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Mike (MI)

08-07-2000 14:30:17




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 Re: Type of gas to use in D-17? in reply to David in IA, 08-06-2000 21:40:16  
Gas with ethanol is not really a good idea with a carburated engine. The problem is this: it requires almost twice the volume of ethanol to produce the same energy as gasoline. Ethanol blend fuels are effectively lean in energy a couple of percent.(I would have to do some calculating for a while to get an exact number)Fuel injected engines use an oxygen sensor to establish a correct air/fuel ratio. On top of that, ethanol is extremely corosive and rubber fuel lines are incompatible with it. It is also very hard on the valve seat to insert interface. As far as the valve seats go, hardened inserts in the head would be good insurance to avoid seat recession (valves sinking into the head). Fuel that was rated at 91 research method would be close to the 87 (R+M)/2. Research method indicates a fuel to have a high octane number, and Motor method indicated that fuel to have a lower octane number. So now the two methods are averaged and that is the number at the pump. If the tractor is not a plow pulling tractor and is used heavy only on occasion, I wouldn't bother with anything - just adjust the carb and go. If it is a hard worker, I would invest in the hardened seat insearts, adjust the carb to run properly and run it. You will do more damage by leaving the carb lean than by richening it up to run right - after all, it's just one screw to adjust the main circuit. Good luck!

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acd17 toy

08-06-2000 22:20:19




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 Re: Type of gas to use in D-17? in reply to David in IA, 08-06-2000 21:40:16  
dave, you can use almost any type of gasoline in your 17. It is better for the valves if you ad lead to the fuel, or the next thing [not very cheap] is to have the head and valves refitted for unleaded gasoline. a good repair shop can do this. As for the low power the enthonal fuel may have loosend dirt and rust in the tank causing the filter or fuel line or even the carbretor to be pluged with this dirt. try taking the fuel line loose at the carbretor and forcing air back into the fuel tank but first remove the fuel tank cap. where do you live at here in Iowa?

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