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Edward Mobley
New member
Username: Edward_mobley
Post Number: 1
Registered: 03-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 29, 2008 - 05:58 pm: | 
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I see that the Argo Avenger 750 EFI has 31 hp. This engine is 700+ cc's. I then was looking at a Polaris Snow Machine that is a 700, and it has like 60hp. Why the difference? Is is because it is measured properly (at the wheels) whereas the snow machine is measured at the track, or someplace farther up in the drive system. I know that for years American trucks were rated at the tire, whereas the Japanese were measuring them motor's hp at the shaft, and claiming a higher number. So, is the Argo, or Max's claims based upon a rating that the tire, as in what is actually delivered. |
philip w.cox
Senior Member
Username: Philipatmaxfour
Post Number: 506
Registered: 01-2005
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, March 29, 2008 - 09:45 pm: |
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Ed- The horse power output of an engine is determined by multiplying three things. The maximum torque output, the engine rpm at that output, and a formula. In 2 stroke and other hi spin engines this mathmatical exercise produces very high Horsepower ratings. When Dodge first unveiled their Cummins Diesel Pickup truck engine it produced over 400 pounds feet of Torque but it was only rated at 160 Horsepower. You would need quite a few cars with double that horsepower to tow the Cummins diesel backwards!! You need to take Horsepower with a grain of salt unless you are going to use the motor at the engine speed that delivered that rating, but you can go to the bank with the TORQUE rating! Sorry for the long post. |
Rogersmith
Advanced Member
Username: Rogersmith
Post Number: 375
Registered: 01-2005
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 30, 2008 - 09:55 am: |
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Put that Polaris engine in a loaded Avenger, and it might get tamed. A guy with a dyno says the engines with the best dyno #'s don't always perform best on the track. |
Missouri's Max Dealer
Advanced Member
Username: Brandon_price
Post Number: 269
Registered: 01-2005
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 30, 2008 - 12:42 pm: |
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Most all engines today are measured at the crank. Snowmobiles are two strokes which are always high horsepower. I had a Sea-Doo jet ski with a two cylinder two stroke 782cc engine. It was 110 horsepower and it was a beast. Rotax just knows how to build 'em!
Most 4-wheelers today are around 50hp for the 700+ EFI engines (four strokes). That's where they get their speed. The Avenger's engine is much slower but still has lots of torque and that is what Argos need. |
Edward Mobley
New member
Username: Edward_mobley
Post Number: 3
Registered: 03-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 30, 2008 - 06:08 pm: |
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Well that's cool. I am sort of familiar with taking a high speed-low torque gas turbine and running it through a reduction gear, and ending up with a low speed - HIGH TORQUE system. It is how you get away with putting 4 DC-10 gas turbines into a warship. Theoretically applied to a certain extent. |
philip w.cox
Senior Member
Username: Philipatmaxfour
Post Number: 510
Registered: 01-2005
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 31, 2008 - 01:08 pm: |
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ED, I find that it's interesting to note that between two similar engines it's almost always the one with the longer stroke that turns slower and puts out more torque. A trip through the engine room of that warship would be pretty exciting. |
Edward Mobley
New member
Username: Edward_mobley
Post Number: 4
Registered: 03-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 04, 2008 - 10:53 am: |
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I have often told people for years that if you get your tax money's worth anywhere, it is on a Naval Warship. The engineering is just awesome, I mean try taking your john boat and getting to top speed of over 30+ knots, within 3 boat lengths, and then try stopping it dead within 1.5 boat lengths. And it is possible because of a variable pitch screw, yes, but still the entire ship has to be able to hold together while you are doing this crazy stuff, and we do it ALL the time. And try doing that with something the size of a destroyer, a cruiser, or a carrier. And that is just the "getting you there" part of it, once we are on station it is all POWER projection. I have done it for 20 years, and still never get enough of it. nothing like rolling up into a geographical area and just DOMINATING it. |
Edward Mobley
New member
Username: Edward_mobley
Post Number: 5
Registered: 03-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 04, 2008 - 11:05 am: |
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All in all, a Navy makes other countries behave. It is shotgun diplomacy at it's best, you need not see the shotgun, but you know that it is there, and therefore you are more likely to behave knowing that it is there.
and if all else fails, and you are absolutely , and persistently wrongheaded, then eventually you will be at the business end of that shotgun. Just ask Iran, they lost half their entire Navy in less than 38 minutes, because they refused to behave. |
Eugene Kochnieff
New member
Username: Eugenek
Post Number: 3
Registered: 02-2005
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, April 07, 2008 - 09:01 am: |
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Hi all,
Horse power ie kilowatts is rpm in radians per second times torque in newton meters.
Where 1hp = 0.746kw
Two strokes develop more power because they have twice as many power strokes as an equivalent four stroke engine. they are usually less efficient though as they rarely give twice the power of a similar four stroke, at similar revs. |
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