540 primer

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grey owl
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540 primer

Post by grey owl » Tue Sep 30, 2014 6:27 pm

just wondering if anyone can recommend a priming system for a 540 straight valve?? I made one for my old 470 but am looking for something better for my new engine.
thanks for all the help over the years guys, not a lot of people to bounce ideas off around here.
cheers
will

twister69z
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Re: 540 primer

Post by twister69z » Thu Oct 02, 2014 5:14 pm

IF the accelerator pump is working there is no need for the primer.
Twister69z
If you don't have time to do it right the first time ,
Where are you going to get the time to do it a second time?

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grey owl
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Re: 540 primer

Post by grey owl » Sun Oct 05, 2014 10:29 am

thanks for the response, I should have been a bit more descriptive in my first post. my average starting temp is around -10 c or 0 f. I do have a block heater that makes starting easy even on the cold days but there are time that I do shut down for a few hours when power isn't available to plug in. last year I was in a few spots where I had to use ether and im looking for a friendlier what to start in cold weather.
any thoughts?
will

swamper2
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Re: 540 primer

Post by swamper2 » Sun Oct 05, 2014 12:51 pm

16ft alumitech/406sbc/2.38w/3-80in.R's

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HuntingBigun
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Re: 540 primer

Post by HuntingBigun » Mon Oct 06, 2014 12:10 am

Check with aircraft scrap yards or buy parts for Cessna lots of them had hand primers simple dash mounted plungers that go to one or two cycl do not need to prime them all, depends on if you already have fuel injected or if your cyls have the ports that are plugged off, really simple if you have fuel injection you can use a high pressure pump and plumb into your injectors.

PM email address and I send you a parts breakdown so you can see how they do it on aircraft, my plane has 10-360 and also hand primer systems :thumbleft:
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elChupacarburetor
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Re: 540 primer

Post by elChupacarburetor » Mon Oct 06, 2014 9:39 am

Does your 540 still have the primer lines? I don't really remember ever seeing a Lycoming on airboat where they hadn't been removed. Without those a primer won't do anything that pumping the throttle won't do. I could be wrong maybe an expert will chime in.
12' Gilileo / Lycoming O-360-A1A / 72" 3-blade Sensenich Saber

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elChupacarburetor
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Re: 540 primer

Post by elChupacarburetor » Mon Oct 06, 2014 9:41 am

Here's my O-360 before the primer lines were removed. I actually had them on all 4 cylinders. You can see one sticking out around the bottom left of the cylinder. Looks a bit like fuel injection line.
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primer-lines.png
primer-lines.png (111.97 KiB) Viewed 905 times
12' Gilileo / Lycoming O-360-A1A / 72" 3-blade Sensenich Saber

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