Running engine without prop attached

Automotive powered airboat discussion.
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Running engine without prop attached

Postby raven6947 » Wed Sep 11, 2019 1:38 pm

I have my rigging in the shop and out of boat and getting ready to start up a rebuilt engine. Any reason I can not run it with the rotator attached but without the prop to check total advance on ignition. Thanks in advance.

Southern Airboat Member
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Re: Running engine without prop attached

Postby dieseldog863 » Wed Sep 11, 2019 7:44 pm

The engine could run warm/hot, because it won’t have the prop pulling air through the radiator.

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Re: Running engine without prop attached

Postby SWAMPHUNTER45 » Wed Sep 11, 2019 8:20 pm

You can put a box fan or shop fan up on a milk crate and run it for a bit. Do not romp on the gas, there is no real load on the engine so it is going to whip up fast and that is a great way to spin a bearing.

We do the fan thing all the time, it is not as good as the prop for cooling so you need to watch the gauges at all times.

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