Any 850 Dyno numbers yet ? - Page 3 - HCS Snowmobile Forums

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Old 07-15-2018, 10:51 PM   #21 (permalink)
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With all the talk of the magical peak horsepower, that is only part of the equation.
How wide is the torque curve? I remember before everyone was using exhaust valves the horsepower was so peaky sleds were a challenge to clutch. Miss the peak rpm by a few hundred rpm and the sled would fall on its face.
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Old 07-15-2018, 11:19 PM   #22 (permalink)
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Originally Posted by rabbi View Post
With all the talk of the magical peak horsepower, that is only part of the equation.
How wide is the torque curve? I remember before everyone was using exhaust valves the horsepower was so peaky sleds were a challenge to clutch. Miss the peak rpm by a few hundred rpm and the sled would fall on its face.
I dont know about that.The non ves 700/800 Big block Polaris ran as good if not better than their ves counterparts.
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Old 07-16-2018, 12:07 AM   #23 (permalink)
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Sorry SD, I wasn't just talking Polaris, but sled engines in general.
I remember clutching a skidoo 9500 with a 440 rotary valve engine. If that bitch wasn't on the pipe it wasn't making horsepower. The horsepower graph on that engine looked like the stock market crash.
It was the finickiest, boggiest engine I ever worked with.
Thank God those days are over.


I know we are WAY off track here, so back to the 850 Indy thread.
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Old 07-16-2018, 04:55 AM   #24 (permalink)
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Originally Posted by rabbi View Post
With all the talk of the magical peak horsepower, that is only part of the equation.
How wide is the torque curve? I remember before everyone was using exhaust valves the horsepower was so peaky sleds were a challenge to clutch. Miss the peak rpm by a few hundred rpm and the sled would fall on its face.
Exactly. Avg torque/hp is the way to evaluate engine power. Peak is not nearly as important. With a typical 2-stroke, dyno results usually aren't the best indicator of in the field performance. Mainly because they only assess WOT and only at a controlled rate of rpm increase.

I've been involved in many in the field vehicle acceleration tests. The low rpm engine response is a key factor in improving acceleration.

A few weeks ago, I loaned a special vaporizing anti-reversion 4 barrel plate to a friend for testing. He gained .2 seconds in the quarter mile.
The car runs in the 9 second range. His previous setup had so much reversion in the carb at WOT that the wide-band O2 sensors were reading around 12:1. When he installed the plate, it went to 16:1. He had to add 4 main jet sizes and it was still 15:1. He ran it anyway. Said it made so much more low end power that he hit the rev limiter before the traps and lost control. This was at Milan Dragway. Had to deploy his chute. Car flipped and was destroyed. He is purchasing the plates for his new car.

I've done the same testing on snowmobiles, dirt bikes, PWCs, etc, with similar results.

The point is that a dyno can't easily assess this effect. DTR Jim and I have discussed this issue numerous times.

Any engine mod that broadens the power band will usually improve in the field performance.

So, don't get hung up on peak power dyno readings.
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Old 07-16-2018, 07:26 AM   #25 (permalink)
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Originally Posted by patrioticinnovations View Post
Exactly. Avg torque/hp is the way to evaluate engine power. Peak is not nearly as important. With a typical 2-stroke, dyno results usually aren't the best indicator of in the field performance. Mainly because they only assess WOT and only at a controlled rate of rpm increase.

I've been involved in many in the field vehicle acceleration tests. The low rpm engine response is a key factor in improving acceleration.

A few weeks ago, I loaned a special vaporizing anti-reversion 4 barrel plate to a friend for testing. He gained .2 seconds in the quarter mile.
The car runs in the 9 second range. His previous setup had so much reversion in the carb at WOT that the wide-band O2 sensors were reading around 12:1. When he installed the plate, it went to 16:1. He had to add 4 main jet sizes and it was still 15:1. He ran it anyway. Said it made so much more low end power that he hit the rev limiter before the traps and lost control. This was at Milan Dragway. Had to deploy his chute. Car flipped and was destroyed. He is purchasing the plates for his new car.

I've done the same testing on snowmobiles, dirt bikes, PWCs, etc, with similar results.

The point is that a dyno can't easily assess this effect. DTR Jim and I have discussed this issue numerous times.

Any engine mod that broadens the power band will usually improve in the field performance.

So, don't get hung up on peak power dyno readings.
Wasn't anti reversion some of the things Boswell worked with? Recyclers?
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Old 07-16-2018, 09:20 AM   #26 (permalink)
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Wasm't anti reversion some of the things Boswell worked with? Recyclers?
Yes, and it works like a charm. I bought the patents. Reduces emissions too. I've dynoed and field-tested these devices on everything you can imagine with outstanding results.
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Old 07-21-2018, 10:44 AM   #27 (permalink)
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Yes, and it works like a charm. I bought the patents. Reduces emissions too. I've dynoed and field-tested these devices on everything you can imagine with outstanding results.
Including AXYS 800 fuel injected motor?
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Old 07-21-2018, 03:13 PM   #28 (permalink)
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Including AXYS 800 fuel injected motor?
Haven't tested it yet Dave. It would probably need to mount in the transfer port. These CFI engines don't allow much time for fuel vaporization because they inject fuel at the last possible moment.
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Old 07-21-2018, 04:06 PM   #29 (permalink)
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Not a preproduction model. As I stated earlier hot pipe, cold water running through motor, ethanol to cool things even more.

The Cat dealer was there and stated, “ make this thing hit 160hp”
Read my signature,,, it's a quote from Jim at Dynotech
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Old 08-02-2018, 02:13 PM   #30 (permalink)
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Read my signature,,, it's a quote from Jim at Dynotech
So then Jim lied when he told everyone else 160.6hp .

I spoke with him, Arctic Adventure was there and said, “make this thing 160hp”......so he did with the tricks listed above and a few more.

Call D and D and ask them about the DynoTech test with arctic adventure there then report back here.

I never said it’s 160 hp.......DynoTech did !!

It’s no secret they are 152 hp at Speedwerx and bikeman, and not 160.

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