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Hit & Miss Gas Engine Discussion

Running too slow?


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  #1  
Old 07-03-2015, 07:42:42 AM
Ray Lee Ray Lee is offline
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Default Running too slow?

I need to know if running a vertical air cooled 5hp Bovaird too slow can hurt it? I'm getting no knock and staying very cool. The flywheel looks like it's going to stop completely every time just as it hits. Easy to run faster if that's better for the engine.
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Old 07-03-2015, 07:51:47 AM
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KeithW KeithW is offline
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Default Re: running to slow?

Lubrication is a big issue. I am not familiar with that engine but if it splash lubricated you need to make sure it is running fast enough to splash the oil around.
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Old 07-03-2015, 12:56:20 PM
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Tanner Remillard Tanner Remillard is offline
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Default Re: Running too slow?

I never really figured running engines real slow to where they almost stop before firing was a wise decision. When you take the mass of those flywheels and make them almost come to a stop before firing, then put the opposite load on them when it fires, and continuously doing so when running for hours at a show, that's putting a lot of unnecessary stress on the crankshaft. Have I ever personally seen a crank broke from running slow? No I haven't. Is it worth the risk to me? No it isn't. Just something to think about when running engines like that. Some people will probably give you the complete opposite answer and say you have nothing to worry about, but I guess when I see shaft twisting failures all the time at work from heavy loads that could have been avoided, it makes you stop and think that your engine could do the same
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Old 07-03-2015, 01:58:54 PM
Kevin O. Pulver Kevin O. Pulver is offline
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Default Re: Running too slow?

I've always wondered about the point the Tanner brings up. But if you retard the timing until top dead center it would negate the stress a lot compared to advanced timing I think. And of course the bigger the flywheel the more Tanners point would come into play. perhaps there is enough built-in overkill margin on these enginesthat it really isn't a problem?
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Old 07-03-2015, 03:05:16 PM
HBurk HBurk is offline
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Default Re: Running too slow?

Nuthin wers than sittin, watchin, and listenin to an engine farrin too late.
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Old 07-04-2015, 04:38:00 AM
LeRoy IHC LeRoy IHC is offline
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Default Re: Running too slow?

Hello

I agree with Tanner. I'd much rather see an engine that has been slowed down, but is running steady as they were intended. It just puts a lot of stress on parts that is un necessary. The connecting rod and it's bearing are another part that has to absorb the shock load of trying to get the mass of the flywheels and crankshaft moving after almost coming to a complete stop when running so slow.

Just my opinion and we all know what opinions are worth. I'm not trying to start a squabble here, just saying what I think about the question asked.

LeRoy
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Old 07-04-2015, 04:29:06 PM
RustySteele RustySteele is offline
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Default Re: Running too slow?

I`ve found that most engines have a "sweet spot" as far as RPM`s go, where it will coast the longest, slower or faster than that and they don`t coast as long. I`ve never had luck getting an engine to run as slow as yours without the flywheels absorbing a lot of the push just to get rolling again and coasting long. If you try speeding it up a little, you might find it`ll run much smoother and coast longer. Just my 2 cents worth...
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Old 07-04-2015, 05:32:32 PM
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Fred Van Hook Fred Van Hook is offline
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Photo Re: Running too slow?

Here is a nice 1920 Economy that belongs to a man in Illinois..



https://youtu.be/JtmZjcA2y8I

And here is the IHC Titan that I used to own...



https://youtu.be/7EwK-Ojuipw

I have seen engines that run slow and when they fire they almost jump off the ground. That could be a problem but I don't think these two will break a crank??
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Last edited by Fred Van Hook; 07-04-2015 at 05:35:38 PM. Reason: add info..
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Old 07-04-2015, 05:43:09 PM
RustySteele RustySteele is offline
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Default Re: Running too slow?

That Hercules is running perfectly! It`s not so slow that it`s a big shock to the crankshaft to start turning again. I`ve never seen a throttle governed engine run so slow, at least this one won`t damage the crank!
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