Camshaft recommendation for PMO'd 2.4S ? Options

[amallagh]

I've recently converted my 914-6 to a 2.4S spec engine with PMO 40 carbs.

The engine/heads are standard S spec but with 2.2S pistons giving about 9.3:1 compression rather and the std 8.5:1.

Can any one recommend a specific cam profile/supplier that is optimised for use on carbs with an S spec engine ?
If the std S cams from an MFI engine are considered to the the best for this application then I would be happy to hear your experiences.
I'm looking for a fast road cam to give me similar performance to the std S cams on MFI. The car is used on the road as well as for competition, so I need something smoothy and tractible at low RPM.

Regards
Andrew

[amallagh]

So if I glean some of the different opinions expressed here then the Solex cam is better optimised for a carbed engine then the S profile.

The reduced overlap seemed to be one of the factors that drove this so I surprised to see someone suggesting GE cams profiles which I thought had a lot of overlap. But maybe they were talking just for pure racing and weren't worried about the low to mid range.

On a comparative basis then I would still be interested if anyone had any experience of the relative peak power outputs of E, Solex and S cams on a Weber/PMO 2.4 with S heads. I understand that the absolute power depends on other factors. (In have PMOs with 40/34 venturi, std S heads & ports with 1.5" Bursch headers and a fairly std Bursch 911 exhaust to keep the noise down for use on track)

I see people saying that it is 'impossible' to optimise things for track and road, and of course this is correct. But I am looking for that compromise set up for a road car that is also used for some competition use.

My decision appear to be whether to go for another set of S cams or change to the Solex or E cams if I'm trying to improve the mid range a little without compromising the top end too much. That's why I'm interested in some estimate of the relative peak power outputs of the 3 choices.


If the Solex cam is ideal for a PMO set up with S heads then the next question if where to I get a new or reground pair at a reasonable price ?

[ArtechnikA]

If the Solex cam is ideal for a PMO set up with S heads then the next question if where to I get a new or reground pair at a reasonable price ?

Web-CamDo the Product Search, select Automobile, Porsche, 911 SOHC 12valve, and you get a nice page of options. At the top is the 1966 Solex profile, which per the July 2008 price update are US$718 in hard-weld, $878 on new billet. All the popular profiles are the same price, as you'd expect.

To do it right, you'll also need 12 matched rockers - WebCam will hard-weld and grind your cores for $65 each. They list rebushing separately.

The Euro is at historic rates vs the US$. Strike while the iron is hot.

( I have no personal affilliation with WebCam, and they don't need me to shill for them. )