Ring gear

[HCA]

QED list four options for a ring gear - Standard, Large OD, MEA and Hewland.

Out of interest, what exactly is a 'Large OD' one..?

[alanr]

I can't answer your questions about QED ring gears however earlier this year I bought a 110 tooth ring gear from SJS and I don't think they had any size options. It was just a standard ring gear which fitted absolutely fine. At £40 I didn't think it expensive.
I heated it with oxy-acetylene for a minute or so and it dropped on a standard twincam flywheel just perfectly.
https://www.sjsportscars.com/parts-and- ... 6E0006.htm

Alan

[Craven]

Probably not what QED is referring but there are two sizes of 110 tooth ring gears both for inertia starter, a 10.048 and a 10.167 inch ID.

[HCA]

Ah - interesting!

How does one know if one has one or the other..?

[Lyn7]

I acquired a smaller one by chance. I noticed it was too small for any of the spare twin cam flywheels I had lying around. It fitted a friends crossflow flywheel perfectly!! Maybe significant.?

[StressCraxx]

Ah - interesting!

How does one know if one has one or the other..?

Measure the diameter at the step where the ring gear fits on the flywheel.

[HCA]

Yep - logical suggestion! I should have said that I do not physically have the flywheel, and typically not getting a response from QED…

[StressCraxx]

Yep - logical suggestion! I should have said that I do not physically have the flywheel, and typically not getting a response from QED…

I have a NOS one. Will measure tonight.

[HCA]

Most kind of you! ‘Twould be hood assuming QED supply the same size

[StressCraxx]

Most kind of you! ‘Twould be hood assuming QED supply the same size

I pulled mine out and it measures 10.048, so that's one data point. Best of luck to you.

[HCA]

Thanks! This ties in with what Lyn above says.
Still no reply from QED, so I will order their “standard” one and hope for the best.