Ducman82

the design "hard part that is already done" is still for another motor. now "IF" you can cut off the runners, and the length added is right for our motors, and matches the internal dimensions and it works out, that would be something. maybe find a CAD file of this, and virtually do the cut and chop job and see if it is even able to be "correct" for a 32v. for sure won't fit a 16...

mark kibort

im thinking of buying it.. found another newer one for cheaper too.
why do you say the 16valve is a no go? due to the shape? the shape looks like the S4 runners, no? i wonder how close in size.

the challenge is cutting them off and whats left, either connecting to the short manifold of what carl has made , or something else , maybe 968 manifold?
then, seeing if you can spread them out by about 1/2" each and spread the side to side spacing by about 1-1.5 " as well.

GregBBRD

That's what it takes, to get them close.

Then you need to test them in the real world.

mark kibort

what about these 968 intakes as the lower manifold ? are the same since the 969 and S4 heads are near the same??

GregBBRD

Cut off the top piece, separate all the runners so that they fit on the 928 heads, weld up the gaps, modify the top as needed (wider or longer), weld it back on. Maybe you need two of them to make the top longer/wider and get 8 individual runners (if the runners are attached to each other...you could harvest some from each manifold.)

Those tapered rectangular runners are awesome...it certainly should flow crazy amounts of air!

Ducman82

without seeing it plopped on top of one of our engines, i would say the legs would be uber funky to do for a 16v. grab one up and lets get to work!, see how she fits.

OBehave2.0

S-4 and S-3. How many you need?

GregBBRD

968 intake ports and manifold are gigantic compared to an S4....there would be a substantial ledge which the incoming airflow would hit, if a 968 intake was bolted on.

Probably not the best thing....

mark kibort

I was under the impression that the heads were near the same. intake ports are much larger.. that ledge would not be good. or...........got to port the 928 heads to match... sounds like more easy stuff.. (ugggg)

mark kibort

hacksaw or my usual Axe.... wonder what would work best.

those runners do look pretty nice though.. It just keeps calling me to buy it and hack off its legs!

mark kibort

now we are talking! so, welding up a tube to these might be the best way.


why would it be any more funky on the S4. isnt the spacing still wide like the S4?

GlenL

Wouldn't ya port that to match and get a touch of venturi right before the valve?

mark kibort

yeah... that sounds like a good idea if you could get a smooth transition, no?

but, from gregs perspective... much more work.. he knows im trying to make this a bolt on affair. the real question is the size of the AMV8 ports out of that intake

GregBBRD

There's not enough metal in the 928 head casting to open the ports to 968 sizes....

Strosek Ultra

Do not increase the area of the 928S4 intake ports, you will loose air velocity. The ports at the gasket surface are actually too large unless the heads are sitting on a high speed 7 liter engine having 42mm intake valves.
Åke