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Fairbanks Morse 6hp Z


 
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PostPosted: Tue Oct 29, 2013 10:34 pm    Post subject: Fairbanks Morse 6hp Z Reply to specific post Reply with quote

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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Kelly Barnett
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PostPosted: Wed Oct 30, 2013 4:02 am    Post subject: Re: Fairbanks Morse 6hp Z Reply to specific post Reply with quote

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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PostPosted: Wed Oct 30, 2013 11:15 am    Post subject: Re: Fairbanks Morse 6hp Z Reply to specific post Reply with quote

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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gtx1967jewison
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PostPosted: Sat Jan 25, 2014 1:56 pm    Post subject: Re: Fairbanks Morse 6hp Z Reply to specific post Reply with quote

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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