Saturday, July 31, 2010

15 Days to Bonneville - Dyno Day Part II

Last night all the stars aligned and the power went back on in Detroit. Soon after I got the call from Lurch that the dyno runs were a go. Lurch's shop, MOT-R-TEC is located in the Southwest side of the city back down an unmarked ally that looks as intimidating as his shop dog parked outside by the garage door. "He's not for petting" Lurch told me on my first visit - roger that. Anyway, after a few set up runs (and a sprocket change) to make sure everything was solid in the motor and trans we dialed in a 6,000 rpm rev limit on the dyno and lit the wick. The first hi-speed runs were spent on jetting. I think we tried at least 4 different sets before we found the magic one that provided smooth acceleration and no breaking up on the top end. Then it was time to dial in the timing which we did about 4 times making runs after each change to see the numbers. I have to say using a dyno is the whip. There are so many variables that can completely screw everything up so it's nice to see numbers that allow you to quantify and pinpoint both positive and negative changes. We could have never done this on the salt. Run after run we kept getting more and more power and torque. Ultimately we ended up with numbers that were far better than my first (pre-head gasket problems) dyno runs a month ago. We are going just as fast at a much lower rpm which makes my job running the thing down the line far easier. I cannot say enough good things about Lurch, his son Tommy and their shop MOT-R-TEC. They saved my ass for sure. The motor runs better than ever with no leaks, knocks or smoke. If you need any (they do it all) work done on your HD scoot, drop me a line and I'll get you in touch with them.


Boardtrackfan said...

Any video of the runs?! I just want to hear it run! said...

Everybody in Southwest Detroit knows Lurch and Tommy have the most awesome motorcycle repair and reconditioning expertise around. Were glad you found them.

Diesel said...

Boardtrackfan, yes there is video I will try to upload soon. V

Venusgo, I know, I know. Lurch said to me when I first met him, "why has it taken us this long for us to meet?" I guess fate was holding back...but now everything is in it's proper place in the universe - er, or the detroit cycle scene.