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Stationary Engines Discussion Forum

Fairbanks Morse 6hp Z

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Author  [Modern View]

10-29-2013 23:34:23

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Just obtained this engine. Serial # makes it a 1916. Have it pretty much figured out except for one thing - there is a small (1/8") tube that runs from the intake (just downstream from where the carb bolts on) to the head just above the intake valve. It has a needle valve on it where it enters the head above the valve.

What is the purpose of this???

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01-25-2014 13:56:31

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 Re: Fairbanks Morse 6hp Z in reply to Senator, 10-29-2013 23:34:23  
No. Kerosene is very low octane, the water prevents pre-ignition (detonation/pinging). Low compression is required when using kerosene in a spark ignition engine.

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Kelly Barnett

10-30-2013 05:02:32

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 Re: Fairbanks Morse 6hp Z in reply to Senator, 10-29-2013 23:34:23  
That is for the water injection when it was to be ran with kerosene. I just leave mine closed on my 6hp Z since I just run regular gas in mine.

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10-30-2013 12:15:08

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 Re: Fairbanks Morse 6hp Z in reply to Kelly Barnett, 10-30-2013 05:02:32  
OK...Am I correct in assuming it robs some of the cooling water from the hopper (water jacket in head)? I haven't had the head off, or it would probably be apparent. And the reason for water injection if running kerosene is? A bit of extra cooling for cylinder or perhaps to raise the compression a bit to detonate the kero?

Thanks in advance for any answers.

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