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Flywheels  Rate Topic 
 Posted: 10-06-2009 06:52 am
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Joined: 04-01-2008
Location: Sandefjord, Norway
Posts: 583
Can the later Lotus flywheels be used with the JH clutch, or do I have to use the JH flywheel as well?

My Spec5 engine will be arriving today, just mentally preparing myself for the task ahead. The later Lotus flywheels are lighter, or am I mistaken?


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 Posted: 11-05-2009 11:23 pm
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Greg Fletcher

Joined: 03-11-2005
Location: Lake Nacimiento, California USA
Posts: 422
Later Lotus flywheels do fit, although no idea up to how far that goes. They look about the same, I doubt they are much lighter. The biggest advantage is that they have a shoulder to keep the ring gear in place. On the JH, the ring gear just sits there and gets pushed back by the starter over the years to the point that it will eventually not engage and need to be repositioned. Complete failure on the design on that one. When I rebuild an engine, I take the flywheel to a machine shop and have them spot weld it all around and get it balanced.

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 Posted: 05-18-2016 01:29 pm
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Joined: 07-10-2012
Location: Whitehills , United Kingdom
Posts: 156
I have a question regarding flywheels which I hope someone can help me with - my understanding is that early 907s were fitted with cast iron flywheels that were safe to 7400 rpm and later engines went with cast steel which in lightened and balanced form were safe to at least 8800rpm. The club store sells lightened 'steel' flywheels but they are exchange. Can anyone tell me at what point in production the flywheel material changed?

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