Fly Wheel Question

[AlfaLofa]

I have an engine with a 6 bolt crank which has no fly wheel.

The crank is drilled for just a single fly wheel dowel.

Which of the 2 following offerings would you advise?

The Burton wheel appears to use no dowels whereas the QED fly wheel uses 2.

http://www.burtonpower.com/parts-by-fit ... fl254.html

or

http://qedmotorsport.co.uk/qed-shop/lot ... d/6bdd/12b

Excluding the drilling - why do they look so different??

Also am I right in assuming that the standard clutch size is indeed 8.5 inches?

[rgh0]

The photos are different because they are looking at opposite sites of the flywheel.

The cranks had a single dowel hole in them but I dont believe Lotus used a dowel in the 6 bolt cranks. All the orignal Lotus 6 bolt flywheels I have dont have a dowel hole.

The Burton flywheel appears to be lightened, the QED flywheel appears to be "standard pattern" which I presume means not lightened

A standard flywheel with ring gear is around 7.0kg
A typical lightened steel flywheel with ring gear around 5.5 kg
A typical Aluminium flywheel with steel facing and ring gear around 3.5kg
Extreme racing flywheels with just a rim and spokes can be under this weight

I dont understand why Burton quote a different weight for the flywheel with inertia ring gear versus preengage ring gear

The Elan orginally used an 8 inch / 200 disc I beleive in a 8.5 inch / 215 mm pressure plate assembly. The later Plus 2 had a 215mm clutch plate and you can (and most have?) retrofit Elans with the 8.5 inch clutch plate.

cheers
Rohan

[AlfaLofa]

Thanks again Rohan !!