Flywheel and Pully Weight Q

[mcandmar]

Does anybody know the weight of a 7A flywheel?

And the weight of the pully for a 7A and 3B?

On both items the 7A and 3B show different part numbers in ETKA, could there be any other difference other than the weights?

Thanks,

Mark.

[Martynf]

Hi Mark,

Those weights are:
7A flywheel 11,130 grams
7A pulley 4,350 grams
3B pulley 4,280 grams
The only difference I can see is the weight of them Mark, nothing else. They both run the same belts, same cam belt pulley, same crank... has to be just down to weight.

HTH

[mcandmar]

Sweet, so it looks like both 7A items weight slightly more. Makes sense i guess, larger pistons, more moving mass etc.

I don’t suppose you would know the ABY pulley weight off hand too? I'm 99% sure it’s heavier as it has the grooved alternator belt pulley which is wider.

Answered my question though, its 3B items i need

Mark.

[Martynf]

No problemo!

The ABY weighs in at a very trim 5066 grams someone needs to go on a diet!!

[mcandmar]

Hah that makes that decision easy, aby pulley in the bin me thinks

[AndersS2]

Does anyone have the 3b/aby/adu/SQ flyheel weight?

[mcandmar]

3B flywheel 10.5kg
7A flywheel 11kg
ABY flywheel 14kg

3B pulley 4.26kg
7A pulley 4.3kg
ABY pulley 5kg

AAN/ADU/ABY flywheel are the same. No idea about SQ.

[AndersS2]

thanks alot mcandmar!

[Flat on my back]

SQ pulley.

About 5kg...from the bathroom scales.

[DJones]

Apologies bit of an old thread...

Just got my 7a flywheel back from Automark, it now weighs in at 8.85kg. Just need to order a driven plate and I'm almost ready for the 6 speed swap...

Darren.

[mcandmar]

Sounds good, wish i had mine lightened too. I recently drove a 3B with an alloy flywheel, (fidenza i think). Really liked it, made the engine much more responsive. Biggest benefit i found was going down through the gears, could do it much quicker as the engine responds instantly to blips of the throttle. Have to say i didnt notice any down sides to it at all, would really suit the character of a UR IMO.