2QuickS

I'm thinking of carbureting my 944S...seriously. Can 944S camshafts be reground to a more carburetor friendly profile?

jhowell371

Camshaft profile has no effect on method of fuel delivery. Your camshafts are fine as is.

Dan Martinic

What could you do about the distributor?

Van

I seem to recall pictures of a Michael Mount engine with carbs on it. It was designed to make power in a very small rev range.

Why are you thinking of doing?

V2Rocket

nice thing about Weber types is they're like ITBs in that you can go wild with the camshaft specs and still have a decent idle.
944S cams are *so mild* that anything spicier would be a major improvement.

951and944S

Just take caution, anything north of .455 lift will require head to be clearanced for the lobes to pass the casting.



T

V2Rocket

who needs lift when stockers are ~216 degrees at 1mm...

2QuickS

Wow, lots of early responses, thank you.

I'm thinking of Webers but might fabricate my own using "spill tube" design to eliminate need for floats; also, four throttle bodies would be easier to create intake manifold vs. what would be required for side draft Webers with different throttle bore spacing than that of cylinder spacing.

Why do this? I seriously dislike the gigantic occupation of engine bay space of the OEM intake tract. Besides, I'm a carb guy. Ten years restoring & modifying Webers, Zeniths & Solexes for the 911 crowd. I do like the carburetors, yes I do.

Ignition to be MSD 6AL-2 which I've been told will work fine with OEM dizzy.

I expect power loss, lower fuel economy, more difficult starting and periodic tuning. I'm good with all of that.

I would keep profile rather mild so power would develop around 6200 RPM with redline at 6800 RPM, kinda like 911 Solex cams.

Just wondering if anyone knew offhand if OEM cams could be re-ground. Dogherty and Lindsey do not list cams for twin cam engines but Broadfoot does offer them. Elgin is another consideration for cam provider. I'll query Broadfoot regarding their cam offerings.

V2Rocket

Web Camshafts in California has a hot grind for 944S. I had them do a pair for me a while back, modified stock profile for my own project.
FE might decrease and mid-range may suffer a little, but I'd expect top end power to RIP with a short-runner intake.

jhowell371

Four valve engines breathe slightly different than 2 valve engine. Two valve engines breathe more in a longer drawn (valves open longer) out manner while 4 valve engines with their superior airflow only need take a quicker short duration gulp, hence the different cam specs which make the 4 valve cams look deceptively mild compared to the 2 valve camshaft. This how I understand it. Your mileage and opinion my vary

951and944S

30+% more area on the 2 x 37mm vs the 1 x 45mm.

The smaller valves are way easier to control.

T

2QuickS

Yes, valve area & inlet port area are WAY more than 911, I've looked into that as part of my throttle bore selection.

Spencer: Thank you for the referral to Web Camshafts!

Kurt R

Jon Milledge makes several different cams for the 16 valve.
http://jonmilledgeengineering.com/pr...rated-4-valve/

951and944S

Web does regrinds from your existing.

Some Milledge, if not all are weld + regrind.

CatCams, brand new billet blanks in standard (stock) + 6 different performance grinds for the 19T sprocket cams for 944S and S2.
CatCams are hollow, lighter cores, my finished cams weigh in at 3 lbs less each than factory cams.

T

951and944S

@2QuickS I have a few sets of stock 944S cams if you are looking for a pair to have ground while your car is running.

Make offer.

T