I have been thinking about buying a new flywheel for a go hard motor im collecting bits for. I was wondering which people think are better and why?

I Noticed that pre-engaged flywheels are generally lighter then inertia type.

Once i get some sort of conclusion here i will ask about "how light is too light" But dont answet this yet

Brenton

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On all the Pre-verto stock flywheels, the difference between Inertia and Pre-engaged only relates to the way the ring gear is fitted. Inertia types have the lead edge AWAY from the engine and Pre-engaged is the other way around. It's to do with the direction that the starter pinion comes in from.

I really couldn't say why, in lightened form, one would be lighter than the other. Are the ones you've been looking at from the same supplier? (links?)

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I understand how they are different, in that one starter stays engaged the whole time and then spns, while the inertia spins out crashes into the flywheel and then spins the motor

I read that the ring gears are different as well.

I was wanting to know are there any benefits of using one over the other?

Just thougt i should find out if one was better than the other before i bought one.

The comment i made before about preengaged being lighter I dont think is substantiated so i take that comment back


Brenton

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if it's a go-fast engine then you'll probably put a pre-engaged starter (gemini etc.), so go with that sort of ring gear

Pre-engaged UK starters (Rover etc) use a ring gear which is different diameter to early Minis. be warned... no fit Oz flywheels.
Gemini pre-engaged starter works with the early flywheel, not the Rover ones.
The ring gear is shrunk on (except automatics), and I've never had one move.

Automatics have it welded to the steel torque converter housing in about 8 places.
Don't do this with a factory manual flywheel, they are all grey cast iron and doing so is inviting it to crack.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

The normal ring gears on our have a leading edge on both sides, so it does not matter which starter you use.

I was completely wrong then