Flywheel Lombardini Focs

[Anorak_ian]

Hi, I have a Lombardini Focs engine. It's a four cylinder 1200cc, and it has no fly wheel.

I have seen other people’s engines, 850's etc and the fly wheel is really small.
So the question is does it need a flywheel at all? Is the flywheel just for the starter motor ring?

[XLerate]

A flywheel does much to absorb some harmonics & absorb the shock of combustion events. That rotating mass makes up for the time in revolution when there's no power impulses produced. On some engines it's also a major part of balancing the reciprocating mass. It helps with gear change events too. Actually does a lot on some engines.

It doesn't have to be in the original style or type of configuration but still should be an equivalent & balanced mass/weight somewhere off the crank centerline.

I've seen tractor flywheels that were simply a rim similar to a car wheel, filled with concrete! It also acted as the starter, that by spinning this huge wheel by hand it caused tickover.

[Stuart]

Bet I know where you got that engine mate

[Anorak_ian]

Thanks for the reply; what I was fishing for was info specifically on the Focs engine.
Other Focs engines seem to have teeny weenie flywheels, and this makes me wonder if the engine was designed like a bike engine, i.e. the cranks counter weights doing the job of the fly wheel.
I don't want to buy a fly wheel if I don't have to, especially as owners have lightened flywheels of various makes of engines and got good results.

The Focs engine that I have has bolt holes in the end of it where the flywheel bolts to it, and then the pulley (take off) bolts to that.
I'm wondering if the pulley (bolted straight to the crank) and primary setup would do the same job as the original flywheel, as it seems to be the diameter of a small clutch.

[Anorak_ian]

Bet I know where you got that engine mate

No, I got it from a farmer, he didn't complain. Well he couldn't, not with that ductape round his mouth, lol.

[Stuart]

Lol

[Diesel Dave]

It might look teeny tiny, but it weighs a ton.

I know 'cos mine fell on my fingers when removing it.