Dyno Day

comnoz · Apr 26, 2011

Jeandr said:
comnoz said:

I didn't mention cubic inch. Just cubic centimeter. So a 920 would be 92 x .7 or 64.4 horse in good street trim. Jim

Click to expand...

The old rule of thumb was 1 published horse power per 10cc now they are way beyond that either published or real. I guess the old Brits are still stuck in the past with real or imaginary numbers :wink:

Jean

That's all right, so am I. Jim

Hobot · Apr 26, 2011

Alrighty strangers will believe me telling em my 750 is worth 75 hp! [potentially]

grandpaul · Apr 27, 2011

hobot said:
This is best free engine stimulator others found for me but still over my digital head to run. Free version only does one cylinder so easy to double out puts.

http://www.lotuscars.com/engineering/en ... oducts#les

I don't think it's accurate to simply double the figure. Two cylinders overcome friction losses and supply more relative power to the flywheel than just one.

grandpaul · Apr 27, 2011

Jeandr said:
comnoz said:

I didn't mention cubic inch. Just cubic centimeter. So a 920 would be 92 x .7 or 64.4 horse in good street trim. Jim

Click to expand...

The old rule of thumb was 1 published horse power per 10cc now they are way beyond that either published or real. I guess the old Brits are still stuck in the past with real or imaginary numbers :wink:

Jean

Jean, those british horses are much smaller than our thoroughbreds. Ever see a Shetland pony? Like a Cushman utilkity scooter.

Jeandr · Apr 27, 2011

grandpaul said:
Jeandr said:

comnoz said:

I didn't mention cubic inch. Just cubic centimeter. So a 920 would be 92 x .7 or 64.4 horse in good street trim. Jim

Click to expand...

The old rule of thumb was 1 published horse power per 10cc now they are way beyond that either published or real. I guess the old Brits are still stuck in the past with real or imaginary numbers :wink:

Jean

Click to expand...

Jean, those british horses are much smaller than our thoroughbreds. Ever see a Shetland pony? Like a Cushman utilkity scooter.

Yeah, I was talking more about asian horses, used to be a 500cc was good for 50HP, then they got shots of steroids (legal for them) and now a 600cc makes more than 100HP, real ones to boot. I will stick to my heavy slow clydesdale which is more than good enough to lose my license.

Jean

JimC · Apr 27, 2011

My first powered two wheeler was a "48" Cushman. It was pretty popular back in 1956 when I first got it. Lots of young girls asking for a ride. Fifty-five years later I don't seem to get as many requests for a ride from young girls. Should of kept the Cushman.

dynodave · Apr 27, 2011

comnoz said:
Mark said:

Jim,
Sorry for the ignorance, but what's dyno day?
Are you dialing in bikes or is it just a peak HP bragging rights type of thing thing?
Do you do it very often?
how many bikes showed up?

Click to expand...

Dyno day was an event organized by the Co. Norton Owners Club, this was the first year, just a BS session, lunch and run you bike for bragging rights, we had a small turnout as the weather was not so good. Probably will do it once a year if there is interest. Jim

I had done dynodays back in the mid 90's with my local norton and BSA clubs. It drew a good crowd for a few years then peetered out after 3-4 years. It turned into just a cook out....with everyone just talking bike talk.
I am now in the process setting up the chassis dyno again in my new shop. I need it functional fairly soon to do a tune up that I have scheduled for later this month.
I may do an open house/dynoday later this year.
:mrgreen:

comnoz · Apr 27, 2011

Dave, What dyno do you have? Jim

dynodave · Apr 27, 2011

Jim
It was an antique back even in the mid 90's.....it's a Serv-Equip which became western mfg... makers of handy lift
http://www.thecarlsoncompany.com/handylifts/
the professional bike lifts which then got incorporated with....
http://www.thecarlsoncompany.com/index.htm
They now sell dynojet dyno's
Mine is a hydraulic brake dyno with the torque/HP readout. Max 100HP
I wanted a brake not an inertia... since I wanted to study heat soak on the air cooled engines. Now a days I use it mainly as a load cell... for synching carbs @ 8-15 hp (50-70 MPH)
I now do my own system maintenance and modifications

comnoz · Apr 27, 2011

dynodave said:
Jim
It was an antique back even in the mid 90's.....it's a Serv-Equip which became western mfg... makers of handy lift
http://www.thecarlsoncompany.com/handylifts/
the professional bike lifts which then got incorporated with....
http://www.thecarlsoncompany.com/index.htm
They now sell dynojet dyno's
Mine is a hydraulic brake dyno with the torque/HP readout. Max 100HP
I wanted a brake not an inertia... since I wanted to study heat soak on the air cooled engines. Now a days I use it mainly as a load cell... for synching carbs @ 8-15 hp (50-70 MPH)
I now do my own system maintenance and modifications

Nothing wrong with that dyno. I do all my dyno mods also. Supeflow is no longer of any help to the small guy. If you call them for support even on something they just sold you they want your credit card number first just to talk on the phone. As the Superflow parts have given trouble I have been replacing it with other more user friendly stuff. When I first bought the dyno they were easy to deal with but times have changed.
The brake on mine is a hysterisis brake from a rock truck. Works perfect and will hold a Norton at about 10% power. The 200 horse Eccosse made it work a little harder. Jim

comnoz · May 3, 2011

Here is a link to the Colorado Norton newsletter with the dyno graphs from three vastly different bikes.

http://www.nortoncolorado.org/nc2011/No ... better.pdf

Dyno Day

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