Dyno Day

comnoz · Apr 23, 2011

Dyno day went off without a hitch. No blown motors or shrapnel.
1st Place was Micheal Homes hot rod 880 with 64.7 corrected crankshaft horse.
2nd was Bob Hermans warmed up 850 with 54.4 Horse
Eric Bergmans 850 with the single flatslide recorded the lowest figure of 42 horse. He is now planning on re- installing the Amals. Jim

KHK · Apr 23, 2011

What is your correction factor used to go from RW hp to CS?

comnoz · Apr 23, 2011

KHK said:
What is your correction factor used to go from RW hp to CS?

The correction factor is figured from a coastdown test by the dyno so it is not always the same but the 64.7 crankshaft figure gave 55.8 at the rear wheel. Jim

bpatton · Apr 23, 2011

Sorry, ment to to post reply to the wart thread.

debby · Apr 23, 2011

Sounds good, Jim. I was just emailing with Eric about it. I think we're getting him turned into an Amal Man! :mrgreen:

Wish I could have come down. Just didn't work out this year. Maybe next time.

Debby

Hobot · Apr 24, 2011

How much would a dyno dial in cost?
How much power can your dyno handle?
How long does a set up and run through and dismount take?
How many events of engine failure let downs?
Can we see a photo of the engine stressing set up?

comnoz · Apr 24, 2011

hobot said:
How much would a dyno dial in cost?
How much power can your dyno handle?
How long does a set up and run through and dismount take?
How many events of engine failure let downs?
Can we see a photo of the engine stressing set up?

Dyno time is generally $100.00 per hour with a $70.00 minimum. I only do Nortons or bikes that are being raced and I find interesting. I have neighbors pretty close so I try to limit dyno use.
Just a quick horsepower run is only how long it takes to strap it down, start it and run it once to what ever maximum you want to set. Then the brake comes on and brings things back down at a set rate.
I have had a couple light piston siezures - one was on my bike. They were both caused by lean mixture. The most serious come apart was when a triplex chain came apart and pretty much removed the chaincase. Luckily I was standing on the other side of the bike.
Here is a shot of the dyno
The rack on the right has a 5 gas analyzer , a torque monitor , temperature monitors , a strobe for timing and stop motion on moving parts along with 02 sensor and data logging equipment. It also has a stepping brake control that can be set to hold the engine at preset RPM and loads.
And it will handle at least 350 horsepower and up to 700 horse with the electric brake.

Hobot · Apr 24, 2011

Wonderful stuff Jim, more interesting to study than naked women for us old farts. Thank goodness for Norton world them Texans put a bur in your Cdo saddle.

My buddy Wesley visits family cabin in CO mt's in summer so want to tag along and pay for some days diddling Peel trials bike tame to half way straining your brake capacity @ 8 grand crank whipping. Fueling by flattened nail in a pipe sticking up into air chimney. Like your twingle w/o Comp releases may only be started on your dyno. If I strain resources Peel engine may be ready to break in, er run in this summer. She's built for restricted power in order to blast way beyond it and must be run into 17:1 CR detonation zone on 91 octane. Steve Maney, Jim Schimidt, Ken Canaga, Geoff Collins, Tom Drouin, Kenny Dreer, Micheal Strakey and Norris cams plus the Powerarch ignition guy created engine parts, if that helps intrigue ya. There is no room for a carb so must be a flat slab throttle device. Got any options there : )

pommie john · Apr 24, 2011

Do you have an idea of any difference in the readings on your dyno compared to a Dynojet?

I've heard the dynojet ones read high. My BM gave a higher reading on a Dynojet compared to a Dyno Dynamics.
Just wondering how yours fits into it?

Hobot · Apr 24, 2011

Good question, might send Jim your meters to direct compare.

comnoz · Apr 24, 2011

pommie john said:
Do you have an idea of any difference in the readings on your dyno compared to a Dynojet?

I've heard the dynojet ones read high. My BM gave a higher reading on a Dynojet compared to a Dyno Dynamics.
Just wondering how yours fits into it?

My Superflow dyno usually reads a little lower than a Dynojet. There is actually a setting in the Superflow that will make it read like a Dynojet. I don't remember the exact difference but it is a curve. Of course I have never seen two dynos that read the same anyway. Jim

beng · Apr 24, 2011

In 1964 the Norton 500cc Daytona twins that were put together by Dunstall for Berliner Motors to race that year made over 50 crank horsepower with a stock 88ss engine. The only modification was lightened rockers and cylinders were skimmed .033" to raise compression to 10.4:1, Amal Gp's were added and an open megaphone exhaust. Engines had all standard street internal parts. On another actual dyno sheet I have from the Norton works, it shows 54bhp @7600rpm. I have the dyno charts, sheets and spec. sheets for the engines and bikes telling all modifications signed by Dunstall.....

pommie john · Apr 24, 2011

comnoz said:
My Superflow dyno usually reads a little lower than a Dynojet. There is actually a setting in the Superflow that will make it read like a Dynojet. I don't remember the exact difference but it is a curve. Of course I have never seen two dynos that read the same anyway. Jim

The guy with the Dyno Dynamics reckoned that his dyno would read about 12% lower than a Dynojet.
I prefered the figures we got on the Dybnojet of course

Jeandr · Apr 24, 2011

How much power does Kenny have on tap :?:

Jean

comnoz · Apr 24, 2011

Jeandr said:
How much power does Kenny have on tap :?:

Jean

I have never had it on my dyno. I think he told me about 35. :roll:

Carbonfibre · Apr 25, 2011

Interesting to sort out fact from fiction regarding power outputs, and that Amal carbs are the ones to fit if you are looking for best possible performance!

pommie john · Apr 25, 2011

Here's my race 750 Commando on a Dynojet.
It's got 10.5:1 compression, standard valves, Axtel cam, moderate gas flow and the dyno day was to sort out 34 mm Dell'Orto carbs which I was using to replace the Amals. The lower line is with the Amals.
As you can see a set of Bosch platinum plugs made a nice difference. The dyno operator reckoned that indicates the ignition is marginal. ( Boyer with a Kawasaki coil. I might try a Dyna coil to see if that helps.

cash · Apr 25, 2011

pommie john,

Are you using an anologue Boyer ?

Cash

pommie john · Apr 25, 2011

cash said:
pommie john,

Are you using an anologue Boyer ?

Cash

Yeah. It's really old, at least ten years old.

Jeandr · Apr 25, 2011

comnoz said:
Jeandr said:

How much power does Kenny have on tap :?:

Jean

Click to expand...

I have never had it on my dyno. I think he told me about 35. :roll:

35 per cylinder :?:

Jean

Dyno Day

Similar threads