Lotus Elan

Ring gear

PostPost by: HCA » Tue Dec 05, 2023 9:02 am

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

Out of interest, what exactly is a 'Large OD' one..?
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PostPost by: alanr » Tue Dec 05, 2023 12:09 pm

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

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PostPost by: Craven » Tue Dec 05, 2023 3:48 pm

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.
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PostPost by: HCA » Tue Dec 05, 2023 4:23 pm

Ah - interesting!

How does one know if one has one or the other..?
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PostPost by: Lyn7 » Wed Dec 06, 2023 6:44 am

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.?
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PostPost by: StressCraxx » Wed Dec 06, 2023 2:31 pm

HCA wrote: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.
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PostPost by: HCA » Wed Dec 06, 2023 3:50 pm

Yep - logical suggestion! I should have said that I do not physically have the flywheel, and typically not getting a response from QED…
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PostPost by: StressCraxx » Wed Dec 06, 2023 7:09 pm

HCA wrote: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.
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PostPost by: HCA » Wed Dec 06, 2023 7:48 pm

Most kind of you! ‘Twould be hood assuming QED supply the same size :D
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PostPost by: StressCraxx » Thu Dec 07, 2023 6:48 pm

HCA wrote:Most kind of you! ‘Twould be hood assuming QED supply the same size :D


I pulled mine out and it measures 10.048, so that's one data point. Best of luck to you.
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PostPost by: HCA » Thu Dec 07, 2023 10:13 pm

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.
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