Hi all, can anyone who has changed their flywheel to a lightened item tell me if it is a worthwhile mod. Does it make much of a difference to acceleration .? What are the pros and cons  and any suggestions as to which one to go foe if i was considering going for one. Thank you

You will probably not notice any difference driving but the engine will pick up and slow down faster with no load.
Any gain depends on what you have already done to the engine upgrade wise.

When I was considering a lightened flywheel for mine, I too had many questions running through my head as to whether it warranted the cost and work involved. Yes, there are some benefits to it, and as Snoopy says, it will allow the engine to respond quicker.

However . .

Will you notice any immediate difference ?  Probably Not.

Is it worth pulling the engine, just to fit one ? Probably Not

Is it worth considering if the engine is already out ?  Most definitely

Would I fit one again to my next engine ?  Yes, on the basis that whilst the power increase is not immediately obvious, I am a firm believer that every little bit helps towards a better engine. All these little things add up.

I'm firmly in the no camp.

What you gain in increase to get to high RPM is not worth the loss in torque IMHO.

Couple that with a faster wearing clutch, slower off the line and a loss of driveability (less inertia makes for less slick gear changes) unless you are talking about a race car I'd say no.

I've used both on a 1776 and the full fat 1 is my prefered option.

Just make sure that whoever does the machine work takes the weight off in the correct place, ie from the corner behind the ring gear, not from behind the clutch face. 12 1/2 lb total weight works best.

I have used both on a 1776 and would use a lightened one again. It will rev quicker but dont bother if engine is basically a stocker. Get a good quality aftermarket or use a machine shop

I'm firmly in the no camp.

What you gain in increase to get to high RPM is not worth the loss in torque IMHO.

Couple that with a faster wearing clutch, slower off the line and a loss of driveability (less inertia makes for less slick gear changes) unless you are talking about a race car I'd say no.

I've used both on a 1776 and the full fat 1 is my prefered option.

thanks all, probably only if motor out for a clutch or something. Thought it may give a bit more response out of bends etc but prob best upgrade tp a more powerful motor one day