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

[brant]

You've opened a big mystery box now
there are lots of tricks, and lots of ways to get the most out of it.
and it really all boils down to intended use:

what RPM will you really be at
street or race, because you can't maximize both....

by the way, you can get GE grinds for 3 bearring set ups
most of the guys I know run GE60's on the street
and most of the guys I race with run GE100's (on 1967 2.0/6 motors)

you can really really help jetting by using IDS style auxillary enrichment devices, and also by running tall 2ndary venturi's

you can work around flat spots by changing primary venturi's or changing gearing.

not to mention the use of a wideband type system to actually get it perfect.

I do all of the above
I love the auxillary enrichment tubes, and I run an F/J/O/S/V gearbox that leaves me in the power band at all times...

[ArtechnikA]

by the way, you can get GE grinds for 3 bearing set ups

cool deal, good to know!

most of the guys I know run GE60's on the street

the GE80 is a little milder than a RSR Sprint cam and one of the contending profiles for my 2,8.

...by running tall 2ndary venturi's

did we ever establish if those are available for 46's? 'Cause I have a pair of those in case I get impatient while saving my nickels & dimes for an RSR MFI setup...

[brant]

[quote]
...by running tall 2ndary venturi's[/quote]
did we ever establish if those are available for 46's? 'Cause I have a pair of those in case I get impatient while saving my nickels & dimes for an RSR MFI setup...
[/quote]


Rich,
I know they exist
I wish I knew you were looking
my buddy just sold a set about 3 weeks back.. fairly reasonably too...
(his were running on a 906 cam'd 2.0/6 GT 914 racer)

[ArtechnikA]

I know they exist
I wish I knew you were looking
my buddy just sold a set about 3 weeks back.. fairly reasonably too...

3 weeks ago we were on the roadtrip to MN and back and wouldn't have been able to afford them, reasonable or not. Still getting caught up from that expense, just in time to go buy this winter's heating oil contract, right ahead of the property tax. Things get 'normal' again around October...

If you come across another set, keep me in mind.

It finally ocurred to me to go check the carbs I've got - they've been boxed since i finalized that deal more than a year ago. Took the rainsields off and - well, they look a lot like that picture! They extend about an inch up over the baseplate, maybe 2 inches down into the velocity stack. I thought I remembered the 40's extending nearly to the top of the stack. Don't s'pose you have any meansurements so I can see what it is I've really got? ( I've seen the standard 40 aux vent's and these are definitely taller than those, but they don't come near the top of the stack... ). These carbs had previously been used in a track car and have all the earmarks of having been set up right.

( Sorry about the temporary thread hijack - as you were... )