check out this video I found.....not my build but very cool. two webber 32/36's on a cut off large log and each carb has its own plenum!
Uploaded on Feb 13, 2012
A 1980 Ford 200 head with large log intake manifold was cut lengthwise along the intake manifold on a table saw using a Lenox Titanium steel cutting blade. Sheet metal port dividers were then fabricated and welded in place. The intake plate mounting surface was then planed flat by a machine shop. A 1/8" steel plate was then fabricated by cutting 42mm holes corresponding to a 2004 Kawasaki ZZR1200 carburetor spacings. Carburetor boot mounting studs were welded in place and planed flush with the mounting surface. The intake plate was then drilled and the head drilled and tapped for 14 - 4mm mounting bolts. A high heat gasket was then cut to fit between the head surface and the intake plate. Jets, both pilot and main, for the Keihen CVK40 carburetors were increased one size above stock. This resulted in a rich idle condition, but strong mid and high rpm. My next step will be to return the idle jets to the stock size.
my way":rf5pqd64 said:A straight runner has got to be better than a 90 corner. I am playing with the same thing waiting on my alloy head. My head with the most of the log cut off looks exactly like the posted pic.autoX65":rf5pqd64 said:so when they say the log is the pinch point they are not talking about the intake design as the pinch point its really just the whole head is the pinch and is limited to low - mid range street use with small valves being the biggest pinch but the only really benefit I see to cutting off the intake is to port it and hopefully so to come get it on a dyno to see what it will do.
I used pieces of 1 1/2 exhaust tubing -close to 1.4 ID. The pieces are cut from 90 deg bends with enough bend left to get about 11 degree runner. The curved end was worked rectangular on the curved end close to the port shape with about 2 in straight at the 11, deg. extending out. Used a filler-build material called "lab metal" to seat and seal the tube about 3/4 in. in the port, with a concave fillet on the outside for strength and looks. The log is 16 ga. sheet metal 3x6x2x6x20 in. The difference of one in. on the wall portion allows the bottom to follow the 11 deg incline of the runner and top to be level for the two barrel carb mounted between 3 and 4. The tubes 6 in long with flared ends enter at the bottom of the 3 in side and end 2 in from the 2 in side with 2 in sticking out the head side. 3 in sections of 1 1/2 radiator hose slips over the tubes and makes the connection. porting and valve mods-.060 milled all on 72 head.
Main point was to describe the lab-metal & radiator hose approach to this verses a machined-bolted-welded flange attachment approach. This leaves a bit of adjustment for fit.
The total runner length about 11 in with room for a bit of adjustment. Wonder how that comes out for RPM tuning on a 3rd wave??
Alloy head in route so this may take a back seat priority
Haven't done pics, soo words will have to do.