Sidewinders at Millville

[Dave M]

Don't Forget

To submit the actual testing data sheets to your SORC at the annual meeting so that they can distribute to the whole racing world to see. It was required with the Tohatsu and seemed to be the biggest complaint of the SORC in trying to make the engine a viable competitor with the Mercs. I recall lots of data on Hydroracer about it, all the testing results, but when it came down to nut crunching it was all rejected because there was no factual data sheets submitted to the SORC. You might want the Dyno sheets to go along with it as well. Place the best OMC in the ASH class today on the dyno and then the Sidewinder so a complete comparrison can be made.

[csh2z]

Sean, The bogging issue pretty much no longer exists. They worked with Lectron on using a variety of carburator sizes and then dialling each in by changing metering rods, jets and float level adjustments to get the most consistant combination. There is quite a learning curve with these carburators, but it seems they figured out what the motor needs.
Dave, thanks for the advise, you are always so helpful to the stock outboard category.

[seanp3]

Thanks John, for the info. Another question for you, however. For someone buying a new motor have to deal with the carb issue, or is that being corrected on the new motors being sold.

[csh2z]

I believe the carbs will be set-up based on the best results that they have tested. Keep in mind that the enviroment,such as altitude & humidity will have an effect on any race motor. You're probably going to do your own testing and experimenting with carburator set-ups, timing, spark plugs etc. just like anything else, but they will advise everybody of perameters and test information for tuning the motor. i.e. Don't set your timing over xx degrees btdc. to help prevent damage.

[STEVE FRENCH]

The A Sidewinder that Mike Kench was driving had many hours of hard testing. Ed Runne Bob Austin and Dylan Runne as our driver, spent many hours of testing metering rod, jet and timing adjustments, before even testing props.Our results from testing ended up being a 56.2 MPH ASR which is about 2.7 MPH faster than our AXSR testing speeds. After completing the A Sidewinder testing, we went on to test the 15ci B Sidewinder. The end results where a 60 MPH BSR. Dylan was doing all the testing at the ASR weight of 350 LBS. Thanks Sidewinder we do need these motors.
Richard Runne

The A Class Sidewinder was very impressive. Ed Runne told me it has the same displacement, stroke, etc. as the B version but with 2 more cc's on the head, slightly lower port timing & smaller carb. Do not discount the driver's performance though. Mike Kench nailed all 4 heats of ASR. He was clearly, though, the fastest boat on the water. These small changes appear to have made little difference between the A & B Sidewinder speeds.

The B still needs some work, however. It contiues to have a 'bogging' problem in the corners & is off abut 500 RPM's. Kench did win on Sat. But it was because Erik's throttle broke 1st heat & all boats jumped the 2nd. On Sun, Kench got 2nd to Erik but it was a distant 2nd on a small course w Erik letting off quite a bit after the first lap. I did not notice this bogging in the A version & I was listening for it. Millville was a great place to watch this with a point right on the front stretch.

My assessment: The A Sidewinder is too fast, the B is still too slow. Nice to see all three versions on the water now, though. Keep up the good work.

Just wonder'n if they have tried the milder ported A block in B configuration?....Could the reed valve motor benefit from milder exhaust ports...I looked at the B cyl on display at whitney and the exhaust ports are huge and little radius in them like a MOD merc cyl.....?
Read'n my Brinkman manual....he talks about how square'n the radius of the drilled Merc exhaust affects the Mercs powerband......

Just some ran(dumb) bar stool thoughts

19P

[form-e one]

MAYBE A SIDEWINDER "D" MOTOR IN FUtURE???????

[KG4]

Whats the price going to be on the new A engine?

[Kev43V]

good question. but i expect it will be nearly the same as the B. This is pure speculation on my part.