Camshaft Grind 147

[jonesa62]

Hi all. I have a set of camshafts (Twin cam) that came from the UK as parts with something else.

They are stamped '147 and 147' on the boss, and these marks match the Int/Exh casting numbers.

Measured Lift (and that means - digital callipers on the camshaft by hand) is about 0.41" or 10.414mm. Previously came out of a Lotus 7 TC that had been raced/hill climbed in the UK. Seller doesn't know what they are. Does anyone have any knowledge of the original grind/brand/origins of these?

[avro]

Looking back at my notes of some 35 years ago l had listed a range of cams that included the 147 profile . I have it down as a copy of the Cosworth L1 (.408” lift ) Unfortunately l can’t recall which tuning company marketed these at the time but they also produced a 141 (L2) and a 137 ( improved Sprint) . Perhaps these other numbers will jog someone’s memory as to who produced this range of camshafts.

Nick

[jonesa62]

Thanks Nick. That's a pretty good start, given an old damaged L1 (inlet) was also included. Lift is about right and with the slight variation to the Inlet vs Exhaust timing of an L1 would make it necessary to mark them as shown. The Cosworth L1 was the 'go to' grind in the early days for so may purposes - and it's still hard to shake as a fast road/race grind.

It would be nice to find the name of the tuning company to get the exact specs - but maybe someone recognises the other reference numbers of 141 and/or 137.

[elated]

Could it be IWR which claimed to have its own camshaft profiles but i can't recall ever reading a part reference (as opposed to what improvements it would bring).
Gordon