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[Shackeng]

Some of you may be interested. Chatting to a friend this morning who has an engineering company that made camshafts for Lotus who put them in the LC engine.
Not a lot of people know that, but now you do.

[doz]

Lotus Carlton cams are standard 3.0lt 24valve jobbies. So I fear your friend is mis-informed

[Shackeng]

Lotus Carlton cams are standard 3.0lt 24valve jobbies. So I fear your friend is mis-informed

I'll check with him tomorrow, he mentioned 2 stage cams???

[doz]

maybe an after market kit but LC's don't use any different valve train bits than the gsi except for exhaust valves which were same in size but apparently filled with sodium.

[Shackeng]

maybe an after market kit but LC's don't use any different valve train bits than the gsi except for exhaust valves which were same in size but apparently filled with sodium.

He definitely supplied Lotus with the camshafts, and thought they went into LC's. He owns a specialist engineering co. and supplies many companies with parts, so he may have got the application wrong, I'll ask him today again.

[Shackeng]

Update. It was about 1990, Lotus were importing Opel cars (Lotus Omegas?) and were supplying engines for other uses. He supplied camshafts that had different profiles which were moved longitudinally hydraulically at higher engine speeds to give a different profile. He does not think that they tried them in the Carlton engine, (despite his musings yesterday) and thinks they were for experimental use anyway, as they only produced a small batch.

Has any heard of any engine in production that used such a design?

[dbug]

Think I'll go with Doz's explanation

[swordfish]

the standard gsi 24v also has sodium filled valves 

[symes]

so lotus carlton was 3,6 twin turbo and used same cams as 3.0 normal aspiration then ?

[doz]

Yep that's the gist of it. In fact the only change to head was some machining to lower the compression ratio. Otherwise that's the same to.

[symes]

so did lotus bore out 3.0? I know chevy stovebolt is about 4 litres so surprised they didnt use that block as basis or v8 for that matter-either way LC was awesome then and now

[doz]

No boring, stroked to 3.6.

[05omegav6]

Which begs the question as to what Irmscher did to make the 4.0 24v lump

[doz]

stroked it even more!!!! Had to notch the block to allow for the throw on the crank

[2woody]

Update. It was about 1990, Lotus were importing Opel cars (Lotus Omegas?) and were supplying engines for other uses. He supplied camshafts that had different profiles which were moved longitudinally hydraulically at higher engine speeds to give a different profile. He does not think that they tried them in the Carlton engine, (despite his musings yesterday) and thinks they were for experimental use anyway, as they only produced a small batch.

Has any heard of any engine in production that used such a design?

you've just described the Rover VVC system quite well. Its just one form of variable valve timing