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 Posted: 09-14-2006 01:42 am
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malcolm
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how does one estabish the differance between cast iron and steel tappets or when did lotus start using steel tappets

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 Posted: 09-14-2006 05:50 pm
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Jensen Healey
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The cast tappets I looked at are machined on the inside as well as out so visual identification may be tough. Are you building a high RPM motor? It's safe to assume they are cast unless proven otherwise. You may have to ask on one of the Lotus lists to get info on later iterations of the 907.

http://groups.yahoo.com/group/S1S2S3owners/ is one such list.

It seems the steel tappets were a available as a standard Lotus replacement about 5 years ago but they back to cast tappets these days.

Kurt

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 Posted: 09-15-2006 01:53 am
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malcolm
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Kurt,

I suppose I am trying to build a high rev motor; Large valve Head  by Richard Reyman, forged conrods, but not necessarily run at high revs (racing), but you never know.

What has been the failure of the cast iron buckets?(Substained  revs at 7000 ,7500 ,8000 ? ) and with lightened pistons and conrods, is this less of a problem?

regards

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 Posted: 09-15-2006 03:51 am
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Jensen Healey
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I read that they are good to 7400 RPM. What cams are you running?

Kurt

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 Posted: 09-18-2006 01:51 am
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malcolm
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Cams are 104/107 and meant to say ligtened valve spring retainers(not con rods /pistons)

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