I have two types of flywheels in my mix of engine bits - one is thicker than the other. the thick one has more metal (about 3/4 of an inch more on the back)

whats the best one to use - 1300 - 4 speed)

Cheers Chris

has one been lightened?

If done properly, then this one, as less power taken up getting it moving.

Mark

hi i have 2 flywheels for my x flow , but the number of teeth on the ring gear differs, one is for an inertia starter , the other is for a pre engaged. fords used to suffer with excessive ring gear and starter bendix wear with the inertia starters. pre engaged don't suffer the same problem can't remember the number of teeth on the pre engaged ring gear but I think the inertia ring gear has possibly 110 teeth, may be of help . Rusty

Presuming that both are from RWD cars then both will have inertia ring gears. This is not a problem. A ring gear is good for 100,000 miles on the road if the starter bendix is kept in reasonable order. The inertia ring gear is identifyable by the teeth having "lead in edges" to assist the engagment of the pinion. The non inertia (which would have probably come from a 1300 Sport / 1600 XR2 - both Mk1 Fiestas) has square, sharp edged teeth.

If the flywheels have not been machined then the lighter one will be from an 1100 X'Flow and the heavier from a 1300 or 1600. For obvious reasons use the 1100.