The inline 5 is back! (valve talk)

[Cody]

>"I've never heard of a 2 valve per cylinder DOHC engine"
>
>Lots of 'em - LOTS of 'em.
>
>Jaguar XK 120/140/150/XKE, etc. About a bazillion motorcycles, too. More if 
>I have time to think about it a little. Lotta Porsches, too, I think. Many 
>more.
>
>

Wouldn't say LOTS of Porsches, actually only VERY rare ones. All 911s (for the uninformed, the 911 model went out of production in the '80s, they only nickname newer models (964, 993, and since '98 it's the 996) after the old car) were 1 cam per bank, 2v, SOHC. The differance is that DOHC as you know it refers to 2 cams per bank (1 bank on an inline of course), but the Porsche engine is single cam per bank. Only 2v twin cam motors were very rare in the 50's in the 356GS-4 quad cam 1600cc 4 cylinder 2 valve motor (even a special gear drive system for the cams, so rare and hard to adjust valves that theres only 6 ppl in the US, maybe 100 in the world that can properly adjust the valves and cam timing), also a similar engine was used in the 550 and 718 models in the 50's. All other Porsche boxer style 4 cylinders are single internal cam w/ pushrods, and all other 6 cylinder boxer engines(excepting one offs and factory prototypes maybe) and dual cam, but 1 per bank. The 928 used!
  a V8, early versions were 2v SOHC, later versions were DOHC quad cam 4v. 944s and 924s were SOHC, until the 944S4 which was DOHC 4v. 968s used the same engine as the late model 944s.

Theres your Porsche lesson for the day! Sorry for the OT but hey at least it's educational.

-Cody Forbes
Black Forest Racing
2x '86 5ktq
'87 5ktq EFI
'88 80 4cyl