I put an FK-45 in my buddie's 2110 a few years ago. 82 X 90.5.
K-roc prepped Oval port CB heads, K-roc recomended using really high compression (so I thought) . 10.5/1 (maybe it was 10.2/1. Anyways, it made 168hp to the rear wheels on a chassis dyno. Ran 12.80's in a mostly full weight 70 beetle.
There was no hole in the powerband anywhere. Stab it a 2K and she would just steady increase Tq. all the way up to 7,000rpm.
I think the compression ratio really made the cam work well for this motor.
It never ran hot at all. He took it on many long hour highway trips in the middle of summer (90+F) I would never have belived it unless I built it myself and watched it run.
As a matter of fact; it ran significantly cooler than the same motor with an Webcam 86-C.
High compression combos don't have to run hotter, but they do like the high octane....
The FK-4X series cams are faster ramp cams (espeically with the FK-45). AKA: "rampy" cam. To make it all work, you must have the valve spings "up to the task".
I think you will be real happy with either the FK-45 or FK-46 with your combo. They are great cams, build and tune it right, and you'll impress more than a few people with it....
Hi Tom,
I still plan on dialing the lift per degree per dgree rate of the FK45 and compare it to K8, 86B, 86C, etc.. to see how rampy it was. I ran it in my 2165 for about 9K miles and upon teardown, checked radial clearance on the lifters/bores... was like new case still.
Not sure what was up with FK45 in my car. Originally it was destined to go in a 94 x 74 motor, not the 78mm. It was a strange cam. Off idle, loads of response, but stomp it in the mid range and NOTHING would happen for a moment, then ka-boom, it would run up to 6K. Carb tuning wasn't the issue, it was a powerband thing. Most of the time I ran 37mm vents with that motor, but also toyed with 40mm and 42mm.
As a side note, I advanced the lobe peak (intake) to 104ATDC (from the usual 108), anothr way of saying "I advanced the cam", but I degreed it in to do this. Most guys "in the know" I've talked to say street motors like 4 deg advance, and some studying I've done said the same. But I wonder if that had something to do with the pause in power with FK45. Never had a VW motor do that before... I've had them be soft all over down low, then come up on cam (FK87, Clay Smith 320) or just yank your head off your neck (K8, VZ15, 86C) the second you stomp it.
The Pauter cam I have now could actually probably stand another 10 deg at .020", but like I said in street gears post, it probably suits the way i drive my car pretty well. I wanted that 911 powerband, and I think I got it.
Take care and happy new year
Jim
The Cal-look Lounge
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