Camshaft options

Engine Oily Bits, Ignition, Fuelling, Cooling, Exhaust, etc.
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Llessur
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Camshaft options

#1 Post by Llessur » Wed Jul 07, 2021 12:15 am

I'm (still) in the process of rebuilding the engine from my 2500S and things are finally starting to take shape.

My camshaft showed some light pitting to a couple of the lobes so I've sent it off to a reputable place in Victoria (Clive Cams) for inspection and hopefully a re-grind.

The cam is a stock 307621 and the head is part number 219021 which is identical (except for the EGR port being drilled for the Australian market - not that I've got one fitted) to the 219016 head. The block is number MM44232HEA. Pistons are +20 thou, bearing shells are all +10 thou. Everything else about the engine and head is standard. Both have had a very light skim to their mating surfaces, the recesses for the head gasket rings on the block are still well within spec. I'll be running rebuilt twin HS6s.

Providing my camshaft is assessed as good for a regrind, should I stick with the 307621 profile would it be worth getting it re-profiled to 308778 specs? Am I more likely to breach the hardening if I go with a new profile as opposed to keeping original?

I can get a 308778 ground from a new billet but this is around 4x the price of a re-grind.

All thoughts welcome :)
Adelaide, South Australia (ex-Brighton, UK)
1977 2500S - White

My 2500 blog: https://triumph2500blog.wordpress.com/

johnnydog
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Re: Camshaft options

#2 Post by johnnydog » Wed Jul 07, 2021 9:50 am

I would be tempted to contact Chris Witor for his opinion. He is probably one of the most knowledgeable about the benefits of the various camshafts in our engines.
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1967 Mk1 2000 in Gunmetal Grey
1969 Mk1 2000 in Royal Blue
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1972 Mk2 2.5 PI in Triumph White
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1976 Mk2 2500S in Carmine Red

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