Turbo cam

[carreraplanes]

Does the early 930 turbo use the same cams as the 2.4 CIS T and 2.7 lux??

[spuggy]

Originally Posted by carreraplanes

Does the early 930 turbo use the same cams as the 2.4 CIS T and 2.7 lux??

I don't have a spec book for the 2.4's, but the '76/77 spec handbook gives the cam part #'s in a table. I presume that where there's a blank, that means "ditto".

All of 911/81, 911/82, 911/84, 911/86, 911/89 & 911/85 (that's the order they're listed in) use a left hand cam of 911.105.143.00 and a right hand cam of 911.105.144.0.

The 930/50 uses a left hand cam of 930.105.141.00 and a right hand cam of 930.105.142.00.

However, the 930/51, 930/52, 930/53 & 930/54 use a left hand cam of 930.105.143.00 and a right hand cam of 930.105.142.00.

Note that the left hand cam has what looks like the same part #, except with a 930 prefix; you might think "ah! that's for the scavenge pump drive boss like on the 3.3 930's".

I don't know for sure that the 3.0 930's have that - but the early 3.3 930's 930/60 and 930/61 use cams with the same part #'s as the 3.0 930s (930/62, 930/63, 930/64 & 930/65 use the same part #, except superceded - e.g. with an ".01" suffix).

The cams are timed differently between the '77 2.7 911 and the 930, and the exhaust valve open duration appears to be the same. However, the duration of the intake valve appears completely different (shorter duration on the 930).

So they don't look like the same cams - although the two handbooks do have a discrepancy (of 2 degrees) for the open/close figures for the exhaust between the 3.0 and 3.3 930's, for the same part #'s timed to the same values...

The Carrerra (930/02 & 930/12) cams (930.105.147.08 & 930.105.148.08) are completely different durations.

You might find it interesting that the Carerra cam part #'s are the same parts as early SC's, until they were updated to 930.105.147.10 and 930.105.148.10 - but both SC cam types seem to have identical durations for both intake/exhaust, just different timing values for different motor types.

In fact, I understand that the 3.2 has very similar cam profiles to the SC (but different timing again), as do later forced induction motors (with the addition of quietening ramps).

Just use SC cams and be done with it My 930 loves 'em.

[carreraplanes]

So I wonder what these are :

911 105 141 0R

911 105 142 0R

They came in a job lot and I was told they were 2.4T CIS or 2.7 lux and would also fit early turbo but clearly the early turbo cams are 930 marked....

[spuggy]

Originally Posted by carreraplanes

So I wonder what these are :

911 105 141 0R

911 105 142 0R

They came in a job lot and I was told they were 2.4T CIS or 2.7 lux and would also fit early turbo but clearly the early turbo cams are 930 marked....

PET says 911.105.143.00 is a left-hand cam in a 1974-77 type 911/42/43/44/47/48/49/81/82/84/85/86/89/90/93/94/98/99 motor.

It also says that 911.105.141.00 is a left-hand cam in a 1974-77 911/41/46/92/97 motor.

I can't help with what any of those motor types are

I have no cam profile data for those - but stock early (pre-965 3.6 turbo 2) factory turbo cams had very soft numbers for timing, lift, duration, so I guess some "cooking" N/A models could have used the same. Stock 930 is definitely not a sporty cam, SC/964 profile is a popular modification...

The 930 vs 911 designation could simply relate to provision for the turbo scavenge pump and/or air (smog) pump drives, I suppose....

[carreraplanes]

Thanks..

[Dwerkz]

Originally Posted by carreraplanes

So I wonder what these are :

911 105 141 0R

911 105 142 0R

They came in a job lot and I was told they were 2.4T CIS or 2.7 lux and would also fit early turbo but clearly the early turbo cams are 930 marked....

I have these,parts manual says 00 at the end for 930 3.0.
Wonder where these are fore?