I've been doing this for years, finally decided to change from biased to fixed to make it easier. 

Recent Thread: //www.minimania.com/msgThread/116454/1/1/Converting_from_HIF_Biased_Needle_to_Fixed

I think the only thing I would like to change right now is the fuel dump on acceleration. I am getting too much right now. I put in a thinner oil into the dashpots (5wt) and that helped a little. Anyone know another way to stop the fuel dump?

By the way, 50 hours is about right. Changing needles, adjusting the flats on the carbs, trying other needles and starting over. But, if you understand the portions of the needles, you can make adjustments by polishing.

Oh, and you need a butt dyno.

Jerry

I spent about 50 man hours profiling the needle for my 1-3/4" SU a year or so ago.  I got it dialed in exactly like I wanted it.  I can say that the car ran so much smoother with a profile that matched the flow characteristics of my engine.  Well worth the time IMO.  I'm glad to hear someone else here spent the time to play around with needle profiling.

THey work, but not well. I think I may have bought the wipers for a later car. The hood hits the chrome part that slides onto the gear when it is open all the way. I substituted the wipers off my TR3, and no hits with the hood. So the part that fits on the hood is smaller. May have to fix that.

Jerry

Good info.

At least your wipers will work IF it rains while driving......and you're legal

My car is 60s mix up with a 1380, 286 cam, twin 1.5 SU and getting the needles to work with the air flow has been a bit of trial and test. I put ALL the available needles through the minty program and tested on the road three of them and the mixture just did not work well. So I looked up polishing needles on the internet and found a few good articles. I was running rich at 1.4 throttle but lean at 1/2 and beyond. Following the instructions now has the car running much better at 1/2 throttle and beyond, air flow meter in the 13s. Still rich at lower throttle and you have to press slowly on the throttle to get the engine up to over 3000 rpm and then it goes like a rocket. Butt dyno says fun! It is all air flow and carburetor combo at this point. I think given a choice I would have gone with the next level down cam to keep the power range a little lower. I really don't use much above 5000 rpm as I am already speeding greatly by that time. I can finally say, that the car has become a daily driver. It is a little loud on the freeway running at 3800 rpm for a long drive. Might have to work on some earplugs. The only thing I still have a problem with is the wipers. Slow and non existent if there is not water on the windshield. I did take apart and clean the rack, motor, and everything works on the bench but not much power out of the unit. I have taken apart about 10 of these units and this is the only one that has been temperamental. The brushes were 3/4, and the armature was cleaned up on my lathe. Oh well, I don't have to drive it in the rain, I do have a truck.

Jerry 68 mini