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Reply to "Auto Meister Manhatten Beach"

OK...So on the dyno I got 130 HP @ 5500 RPM. Two years ago when I built the engine I got 132 HP @ 6000 RPM.  As I said before, this is a CB Engine kit. Not built by CB or Pat Downs. Built by me. I can't remember the engine kit number from CB but it was a 2110 CC  to be coupled up to a 1.625" exhaust system. I have space save manifolds matched to CB's heads with 44mm Webers on top. Electronic ignition in a 019 blender. (distributor) BUT...I changed things.

When I took the engine to Chico it had 32mm venturi's, 47.5 idle jets, 115 Mains, 200 A/C jets, F-11 Emulsion Tubes. We cranked it to a max of 5500 RPM and got 130 HP. The mid range was strong as hell but it was leaning out at the top end under full load (17.2). We changed the mains to 125 and got the same results but not lean anymore. (14.8/15)   Good to go in my opinion.

I gotta comment here and say that Chico and I have developed a mutual respect and he allows me to do all the wrenching/changing on my engine in the dyno room while he does other work in his shop. I really appreciate this. I am actively involved in my own tests and research.

SO...I went back in and changed out the venture's from 32mm to 36 mm. Some of you know that this is a "dig deep" into your carbs to change them. I also went to 130 mains and didn't change the Emulsion Tubes or A/C Jets.

The results were 136 HP @ 5500 but had a big flat spot at about 2000 RPM so we change the Idle jets to 55's and that eliminated the flat spot but made it a little to rich at idle. Mid-range was even stronger than with the 32mm venturi's. We re-adjusted the air screws to lean out the idle richness to a "tolerable" level and that was it.

After discussion with Chico, we decided to not go to 6000 RPM and test there because it's just pushing it to get impressive numbers but in his opinion, they would have been higher.

Now....for some of you hard-core Pat Downs guys, I have determined that his dyno numbers are always higher than Chico's when testing identical engines. This is not to say that Pats numbers are BS ! THEY ARE NOT ! It's just a different dyno and different readings will be produced.  If I use a factor number that puts Chico's dyno numbers on the same level as Pat's, my engine  would have put out  153.68 @5500 RPM on Pat's dyno.  Pat's (or CB's) advertised HP output for the engine kit I bought is 151 HP ! So...WELL DONE CB Performance !

What's amazing is what small changes can be made to "tweak out" a few more HP and still have decent driveability !   AL and Michael....Hope this is informative and helpful.....Bruce

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