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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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 Posted: Tue Apr 13, 2010 6:54 am Post subject: Why exactly shouldn't you run a 914 without a prop? |
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Regardless of what someone else has done, or gotten away with, the engine is designed to run with a prop. Why would you want to risk it to run it without one?
Rick Girard
On Mon, Apr 12, 2010 at 10:51 PM, rparigoris <rparigor(at)suffolk.lib.ny.us (rparigor(at)suffolk.lib.ny.us)> wrote:
[quote] --> RotaxEngines-List message posted by: "rparigoris" <rparigor(at)suffolk.lib.ny.us (rparigor(at)suffolk.lib.ny.us)>
I have read in the past you shouldn't run a 91X without a prop. Why exactly is that?
Here's a guy running a 914 without a prop, seems at low idle without flywheel effect it isn't quite as happy as with a prop, but just a little higher it seems pretty happy.
http://www.youtube.com/watch?v=uksKDll6n7M
Ron Parigoris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=294046#294046
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rparigoris
Joined: 24 Nov 2009
Posts: 805
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| Posted: Tue Apr 13, 2010 10:15 am Post subject: Re: Why exactly shouldn't you run a 914 without a prop? |
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Hi Rick
Thx. for the reply.
"Regardless of what someone else has done, or gotten away with, the engine is designed to run with a prop. Why would you want to risk it to run it without one?"
At the moment I have no need to run without a prop, but got to wondering. I have run plenty of motorcycles and cars that
are a lot hotter tune than a 914 and have yet to over rev one in neutral.
Easy to over rev, not very hard to keep within limits. If I ever had a need to run without a prop would keep kill switch close at hand. Running without
prop is a lot safer if you needed to check something, like intermittent
miss where you could observe one of those transparent spark plugs like
Bing sells? Had a nagging charge problem that would allow you to have a volt meter hooked up and aggressively wiggle and polk at connections? Wanted to check exhaust for leaking by blocking exhaust pipe and listening? If you had a nagging coolant or fuel or oil leak that only dripped with engine running? Start up I think can be a bit harder without flywheel which could stress spraigue I imagine, but sure do like the idea of keeping ones self at less risk compared to performing mentioned checks with spinning prop close by.
Ron Parigoris
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