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Perkins Model Engine, Mixer


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  #1  
Old 12-24-2018, 01:25:24 PM
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Tom Jamboretz Tom Jamboretz is offline
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Default Perkins Model Engine, Mixer

I've been working on a Perkins engine. It is the model with the horizontal hopper cooled, open crankshaft and spark plug. My problem is in the mixer. Does anyone who has worked making one have any ideas on how the needle valve assembly is adjusted. See photos. Thanks
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Old 12-24-2018, 03:20:15 PM
Jim White Jim White is offline
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Default Re: Perkins model engine , Mixer

Merry Christmas OLD TIMER.
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Old 12-24-2018, 06:30:17 PM
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Default Re: Perkins model engine , Mixer

Right back at you and yours. TJ
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Old 12-25-2018, 03:41:24 AM
JasonB JasonB is offline
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Default Re: Perkins model engine , Mixer

That socket head screw goes into the needle and you turn that to adjust the needle then lock the position with the nut(s)

Not made mine yet but that is how I read the drawing.
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Old 12-25-2018, 12:12:10 PM
Oscar T Oscar T is offline
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Default Re: Perkins model engine , Mixer

Merry Christmas Tom. (Wes Tischer)
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Old 12-25-2018, 06:49:36 PM
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Default Re: Perkins model engine , Mixer

Jason, Thanks for your reply, What purpose does the spring inside do? I have the engine completed and ready to go. But gasoline fills the cylinder and gets hydro -static lock -up Thanks for any help.
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Old 12-26-2018, 03:09:25 AM
JasonB JasonB is offline
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Default Re: Perkins model engine , Mixer

As it is drawn I can't see that the spring does anything. If the top of the carb was not threaded then The screw adjuster could be used to set the basic needle gap and then if running faster the needle should start to rise in the airflow and open the needle more. A bit like a Lunk bottom valve opens when it sucks in air to uncover the passage to the needle valve.

If it is sucking that much fuel in then it's open too much and the needle needs screwing down.
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Old 12-28-2018, 06:18:52 PM
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Default Re: Perkins model engine , Mixer

I see what you are saying. I'll try adjusting the needle some more. Thanks.
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Old 01-01-2019, 07:30:09 PM
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Default Re: Perkins Model Engine, Mixer

Well I got it running. Seems I forgot to drill the 3 holes in the bottom of the carb.
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