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General Category >> The Cafe >> Flywheel Removal?
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Message started by N2faster on 09/13/13 at 21:49:00

Title: Flywheel Removal?
Post by N2faster on 09/13/13 at 21:49:00

I want to remove the flywheel for faster engine response. Is anyone running their engine with the flywheel removed?

Title: Re: Flywheel Removal?
Post by justin_o_guy2 on 09/13/13 at 21:58:34

Rodders do lighten flywheels, but if a V8 needs one, a BigSingle sure needs one, to carry the engine thru the exhaust, intake & compression cycles,

Title: Re: Flywheel Removal?
Post by N2faster on 09/13/13 at 22:10:58

Thanks for the response. I would think that the weight of the crank with the counter weight of the throw would have enough momentum to carry the piston into the launch position. My CRF450 felt like it had no flywheel at all. It was kind of nervous at lower throttle.

Title: Re: Flywheel Removal?
Post by verslagen1 on 09/13/13 at 22:23:25

stock carb?

Title: Re: Flywheel Removal?
Post by Serowbot on 09/13/13 at 23:05:27

I wouldn't recommend it... but, if you do it, get some good pre and post performance stats...
I'd bet you get nothing more than extra vibes... :-?...

I'm a born pessimist... (but, I'm usually right)... ;D...

Title: Re: Flywheel Removal?
Post by Dave on 09/14/13 at 04:38:32

You probably could take a bit of mass off the flywheel and be OK - but completely removing it will probably not work. When you are starting the bike and you get the fist fire.....there may not be enough momentum to get you past the next compression stroke. Without enough flywheel starting the engine would be a challenge, keeping it running at idle would be a challenge.....and it would be easy to stall when you want to get the bike moving from a stop.

How light is too light?........Don't know.

Title: Re: Flywheel Removal?
Post by N2faster on 09/20/13 at 15:28:05

Yes, the stock carb is installed at the moment but I have a larger polished flat slide Keihin that I can put on it. My overall sense is that the weight of the crank and alternator will carry the piston through the compression cycle. Then this engine will be like most other singles. The flywheel disc was added for smoothness and not a requirement to run the engine. I think that it will be harder to start and not idle as well but the acceleration and deceleration will be more like other singles. Comments?

Title: Re: Flywheel Removal?
Post by gizzo on 09/20/13 at 15:52:46

I'm with Serowbot I don't imagine it would make the bike any better to ride, but I'd like to see the result too. Just for fun. My tip- will idle like a pig.

Title: Re: Flywheel Removal?
Post by justin_o_guy2 on 09/20/13 at 22:59:12

243E3A383907362523253E333032570 wrote:

I'm with Serowbot I don't imagine it would make the bike any better to ride, but I'd like to see the result too. Just for fun. My tip- will idle like a pig.

IF it idles it will need a higher than 1,000 rpm setting & then I believe it will idle like a spastic pig with a bad case of hiccups.,

Title: Re: Flywheel Removal?
Post by Dave on 09/21/13 at 04:04:32

Maybe your right.

Remove yours and tells us how it works out.

Title: Re: Flywheel Removal?
Post by Charon - FSO on 09/21/13 at 05:34:00

You might find it interesting to look up the variable mass flywheel Suzuki used on the '83 GR650 Tempter. It used a (probably centrifugal) clutch to disengage part of the mass of the flywheel above 3000 rpm. The idea was to have enough mass for a decent idle, but to disengage part of it for better engine response at higher speeds.

Title: Re: Flywheel Removal?
Post by justin_o_guy2 on 09/21/13 at 08:37:35

Ill bet the first guy buildin a motor didnt thinkto use a flywheel, It was built as an answer toa problem, I can see a radial engine with 3 banks not needing one, maybe a V, with lots of cylinders, but a single? I do see this guys hope that the ballance weight & alternator may carry the engine thru exhaust, intake & compression,,but I dont see it working,.He does.
I dont encourage people to waste their time.,

Title: Re: Flywheel Removal?
Post by Charon - FSO on 09/21/13 at 16:41:17

You might also find this link - http://www.epi-eng.com/piston_engine_technology/torsional_excitation_from_piston_engines.htm - interesting. It might help explain the need for a flywheel.

Title: Re: Flywheel Removal?
Post by bobert_FSO on 09/21/13 at 20:33:50

Back in the 70's I had a friend with a 175cc 2-stroke motocross bike with no flywheel. Basically the stator/alternator/whatever was completely removed and the engine was sparked exclusively by battery. It was a workable solution. After all, a motocross race doesn't last very long.

If I recall, I don't think it idled very well, which is no big deal for a race bike. However, the throttle response up and down was INSTANT. When you hit the throttle, you were almost jerked off the bike. When you closed the throttle, it felt like you were going to end up going over the handlebars.

I don't know how he rode it. He would had needed a really light touch on the throttle to get any kind of smooth power. I rode it one time and it was just plain nasty (bad not good) to ride.