Datsun Roadster Forum-311s.org

I'd like to hear from someone with first hand experience driving a 2000 in the following configurations:

A cam SU
B cam SU
C cam SU
A cam Solex
B cam Solex
C cam Solex

Where does drivability become an issue?

Oh thank goodness, I thought you had 2000 questions about cams
When I got my car it had SU's and an A cam, later I switched to solex's and sometime after that I installed a B cam. Before I changed to the B cam I switched to 4:62 axle ratio. To be honest, I don't recall any significant deference in drivability between any of them. Keep in mind that all these changes took place round 30 years ago!

I also went A-SU to A-Solex to B-Solex (44s)

A-SU had the best throttle response as I remember. This may be just the fact that I don't have my accelerator pump system completely tuned but I also feel like it might be something to do with less vacuum.

Pretty minor difference from A to B to be honest. Seems like a little less under 3K and a little more from 4-6
The B cam is not crazy aggressive and is still very much a street cam. A C is where you really start noticing the difference!

The non-accounted for factor "comparing" cams is cam timing... makes a significant difference. Also need to factor in carb venturi sizes. The later Mikuni came with 34s, not 37s, and that plays a role in throttle response, top end power and jetting, and thus each person's subjective feel for the car. Ive run many different cams and many different carbs/venturi sizes. My current cam has about the same duration as a B cam, but with a lot more lift, which actually impacts duration as well. Love this cam, so far. Engine is apart at the moment to freshen up the chains and gears (and now the bearings too!), and I noted the cam appeared to be a retarded when I pulled it apart. With all new chains and gears I plan to set it up in the stock position, then adjust it as necessary for my driving style and what the engine likes.

Not sure that info is helpful, but if you're trying to decide on a cam and carb combo, consider the duration of the cam and where that will typically put your powerband, all things being equal, and go from there.