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Antique Gas Engine Discussion Meet collectors of hit and miss engines, ask questions about collecting, restoring and showing antique flywheel engines.

Antique Gas Engine Discussion

Slowing an engine down


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  #1  
Old 08-02-2005, 10:18:39 PM
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Default Slowing an engine down

I have a nice little 1-1/2 Hercules Hit and Miss engine that runs great at rated speed. I would like to slow it down. Do I need to change some springs? Any help would be great. Thanks .........and Thanks Harry
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Old 08-02-2005, 11:09:31 PM
Rick I Rick I is offline
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Default Re: Slowing an engine down

I can't comment on the springs, but I do know you'll have to retard the timing in order to get it to 1) run well and 2) avoid damaging stress on the engine's crankshaft, etc.

-Rick I.
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Old 08-02-2005, 11:35:33 PM
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Default Re: Slowing an engine down

Rich, yes you need to replace the spring with a lighter one. Are you going to be at Franklin Grove on Sat. I could show you how to change it. Bob
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Old 08-03-2005, 01:51:02 AM
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Default Re: Slowing an engine down

Rich I have a 1926 2hp Jaeger and a 1915 1 1/2 hp Economy which I slowed down by putting weaker springs in the govenor. You take the gov.weights off and pull pin and use weaker and shorter springs. Timing is almost TDC. They are running an actual 166 rpm.(I count cam hits on pushrod for 1 minute ,times two gives exact RPM'S).Dick in central PA.
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Old 08-03-2005, 09:23:56 AM
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Default Re: Slowing an engine down

And the J mixer will probably drool a little when the engine is slowed down..this is normal for a Herc/Economy.

RickinMt.
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Old 08-03-2005, 09:58:14 AM
JKKD JKKD is offline
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Default Re: Slowing an engine down

Along with putting a lighter spring in the governor, you may also have a little spring behind the latching finger that could stand to be lighter. Also adjust the latching finger so that it just clears the latch plate when it's set to run the slowest. You'll also have to keep the choke most of the way closed when running slow. To get around this I machined a smaller venture, which ended up being horseshoe shaped, to drop into the mixer on my 7E Economy. I made no modification to the mixer its self. It is held in place by the needle valve passing through it. Now my choke is wide open and I get no more fuel drips while running. To start the engine I close the choke, roll the engine to the point I can latch the exhaust valve and hold it latched while I spin the engine up. Once the engine is turning good I release the latch and continue pulling the flywheels through compression. If the engine is cold it will fire on the 2nd compression stroke or sometimes the 3rd. If it's warm it will usually go on the 1st. Once it fires I open the choke fully and I'm done.

Good luck,
Jamie
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Old 08-03-2005, 09:14:33 PM
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Default Re: Slowing an engine down

Thanks Guys......down to 175 rpm. Changed the governor spring, latch spring and adjusted the latch. Might try for more (less) later but now it is running nice and slow.......Thanks again to all who replied.
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Old 08-03-2005, 10:37:39 PM
Mac Leod Mac Leod is offline
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Default Re: Slowing an engine down

I have had my herc. 3 horse down to about 90 RPM...gov spring was a former techumseh valve spring...I coverd the mixer intake with foil that had a few pin holes in it...and cut way back on fuel

works for me

Mac Leod
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Old 08-04-2005, 05:30:14 AM
Alan in KY
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Default Re: Slowing an engine down

hey rich you are running the same as my ole k a stover now 175 now im going to have to cut that governor spring again alan
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Old 08-04-2005, 10:16:28 AM
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Default Re: Slowing an engine down

Quote:
Originally Posted by Rich Martz
Thanks Guys......down to 175 rpm. Changed the governor spring, latch spring and adjusted the latch. Might try for more (less) later but now it is running nice and slow.......Thanks again to all who replied.
Rich:

Make sure you retard the ignition timing to close to TDC to lessen the strain on the crankshaft. This will also let the engine run slower.

Take care - Elden
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