Herr-Kuhn

Is anybody in here running a K26-6 turbo with a non-stock camshaft profile...like the .480"/.480" lift cam from webcam?

If so what are the results? Also, what is your exact duration and lift on the cam? Also, how much overlap. I'm really looking for duration, lift and LS angle on the cams being used with the K26-6 charger.

Thanks,

JK

RedlineMan

Hmmm...

Think for a moment.
Think about how a turbocharged engine makes HP...........
Then think about what a longer duration cam does...........
Then see if these two concepts are compatible.

special tool

Andial designed very long duration, stock lift cams for these cars when they were new. I have one. The reason is that the duration would open up the top end - because the 951 top ends sucks in stock form. The lift is not changed because that is for low end, and a stock 951 needs no low-end help.

Herr-Kuhn

Hey I don't need a lesson in cam theory. I simply asked if anybody is running a different cam in a 944T.

My direct application is to fit a set of .470"/.430" Euro 928 cams into my 4.5 liter twin turbo 928. The 944/944T already runs a more agressive cam than a stock 4.5 liter 928, like 0.070" more lift and probably closer lobe centers as well. I'm wanting to see if anybody has pressed the limits on cams on the 944 turbo.

eclou

You might ask the 930 or 964 guys. They used the K26 variant KLDZ(?) and had a variety of cam options. Most of us don't touch the cams at all.

MR951

Wow, that's very helpful.

Herr-Kuhn

Does anybody have the stock lift, duration and LCA for the 944/951?

Waterguy

Valve timing for 1 mm lift, zero valve gap:

1983-1985 944, all 951:

Intake opens 1 degree after TDC
Intake closes 49 degrees after BDC
Exhaust opens 43 degrees before BDC
Exhaust closes 3 degrees before TDC
Stock lift: 12 mm intake, 11 mm exhaust

1985.5-1988 944:

Intake opens 1 degree after TDC
Intake closes 49 degrees after BDC
Exhaust opens 47 degrees before BDC
Exhaust closes 1 degrees after TDC
Stock lift: 12 mm intake, 12 mm exhaust

HIGHBOOST

Well do they? I want to know for myself, could anybody shed some light on this?

Thanks

Eyal 951

Since were on topic of cams, and I really know nothing about them, what would the NA cam do for the turbo. It is said to increase performance. (Hey, everyone needs a noob question every once and a while!)
~Eyal

FSAEracer03

Well that depends on the lobe separation, not the duration.

inactiveuser92616

I would have said the same thing as redline

hosrom_951

I believe the '83 NA came is the same as on the turbo (could be the 924 cam, can't remember).

Herr-Kuhn

Webcam sells a .480" lift I/E with a LCA of 112 degrees that is reported to work well with the forced induced 944 motor. The cams I have for the 928 are lower on lift with more LCA, so I think these will work well for me as I will only run 10-12 psig on my engine in hopes of being able to make over 400 wheel horse with it while not losing any torque mid range. The Euro cams I have are just a bit more agressive than the stock 944-t cam. You see, the stock 928 cams in my car have like 0.080" less left than even the 944 cams. That engine was set up for emissions, not performance. I'm surprised nobody in here has this 0.480" 273 grind from Webcam in a 944-T.

Dr. Dynamics

in general guys, what you won't wanna do is increase the overalap. Overlap on N/A cars is beneficial since while the exhaust valve is still open at the same time as the inake valve, helps scavenge the remaining burned gases from the cylinder(with a proper tuned header) and accelerate the incoming air. An aggrassive exhaust valve closure (ramp) will help N/A's create more intake air pressure inside the cylinder (more air).

On turbos, you don't want too much overlap since the turbo will allready pressurize the incoming air into the cylinder and make the ylinder scavenging faster. If you get too much overlap, you will just throw that boost away.

I'm planning to change my cams, just haven't gotten that far yet, BUT when I do I'll pot my results.