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General Category >> Rubber Side Down! >> Can the engine be run safely in a bench?
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Message started by kamelryttarn on 08/03/20 at 00:22:16

Title: Can the engine be run safely in a bench?
Post by kamelryttarn on 08/03/20 at 00:22:16

I'm beginning to realize I probably will not be finished with putting my bike back together before this season is over so I was thinking about keeping the engine in my mount outside the frame and run it to tune the carburetor. Assuming the engine is vertical to assure proper lubrication and that I can create an adequate air flow for cooling the cylinder: Can I run the engine for extended periods of time to actually tune the carburetor using an AF-meter?

Title: Re: Can the engine be run safely in a bench?
Post by Dave on 08/03/20 at 04:07:47

There is no reason to tune a carb on the bench. The only thing you can set is the idle speed and idle mixture.......revving and engine in a static condition will tell you almost nothing about the jetting. You need to be able to accelerate and run the engine at full throttle under a load to test the jetting.

Also - running and air cooled engine without the bike moving down the road results in poor cooling, and low engine speed results in low oil pressure.

Title: Re: Can the engine be run safely in a bench?
Post by justin_o_guy2 on 08/03/20 at 13:29:53

Assuming the engine is vertical to assure proper lubrication and that I can create an adequate air flow for cooling the cylinder: Can I run the engine for extended p

Dave loses one gold and one blue star.

Title: Re: Can the engine be run safely in a bench?
Post by norm92de on 08/03/20 at 19:13:09

Why would you want to run the engine on a bench. The bench isn't going anywhere. ;)

Title: Re: Can the engine be run safely in a bench?
Post by justin_o_guy2 on 08/03/20 at 20:32:03

Can you install the exhaust?
Probably your best tuning tool would be an O2 sensor in the exhaust..
Someone here has done that..
Getting tuning out of the way before you stick the engine in kinda makes sense, but is likely more hassle than it's worth.

Title: Re: Can the engine be run safely in a bench?
Post by kamelryttarn on 08/03/20 at 22:31:35

Exhaust is no problem. I can easily drill a hole in the wall, expelling the exhaust outside the building.

I am still trying to figure out the correct name for things so when I wrote AF-meter I meant O2 sensor. I thought AF (Air-to-fuel-mixture) was the same thing. I aim to install a Bosch LSU 4.9 in the exhaust and a slide potentiometer on the throttle control so I can log the values and check the O2 value from 0 to 100% of throttle.

Since I already have the motor mounted in my bench stand it is actually LESS hassle than putting back in the frame and doing the tuning there next year. Th only thing I can not do when tuning the engine out of the frame is put load on it but revving it to full throttle shouldn't be a problem.

Title: Re: Can the engine be run safely in a bench?
Post by DragBikeMike on 08/04/20 at 03:34:37

You really should take Dave's advice on this one. If you can't load it you can't tune it. I guess it would be nice to make sure it will start but that's about all you will accomplish. It's not worth all the setup time just to see if it will start. There's also an element of "DANGER".

Just put it in the motorcycle and do the test & tune in a normal fashion.

Title: Re: Can the engine be run safely in a bench?
Post by ohiomoto on 08/04/20 at 05:11:55

You want to bench test a LS650 motor??? I thought the Finnish were a strange bunch...

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