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Old 10-11-2010, 11:29 AM   #1 (permalink)
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What is the difference between a VES and Non VES engine/

Got a 01 RMK 800 snow check, was curious what the difference is between and VES and Non VES engine? and how do I know what I have?
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Old 10-11-2010, 02:22 PM   #2 (permalink)
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Variable Exhaust System .... power valves im pretty sure
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Old 10-11-2010, 06:05 PM   #3 (permalink)
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yes it meants variable exhaust valve. your 01 SHOULD have them I believe. They are two circular black valves on each clinder towards the top. post a pic
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Old 10-11-2010, 09:13 PM   #4 (permalink)
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A 01 RMK 800 is a NON VES, the polaris 800's didn't get exhaust valves until 02.
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Old 10-12-2010, 07:44 AM   #5 (permalink)
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is that a good or bad thing? I have been reading alot about the crank issues with this motor. From what I have gotten out of it, the non VES engines are alot better?
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Old 10-13-2010, 02:48 PM   #6 (permalink)
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the motors must be almost identical,I have a 2000 500 xc, and it has the castings for VES on the jugs, like it was made for it, but never milled out, and my son has a 99 440 xcr with VES,motors look identical to me, the exhaust manifold looks a little different, but thats all i can see.
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Old 10-13-2010, 02:50 PM   #7 (permalink)
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i think only the libertys have ves too, no fujis with it
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Old 10-13-2010, 03:23 PM   #8 (permalink)
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The early Liberty engines did not have VES. But the 98 440XCR did have it. The 2000 600 Edge was next, then 2002 for the 700 and 800. Not sure when the 500 got it, I know the 2006 has it.

An engine designer can port a cylinder to make good power at lower RPM, or good power at high RPM. Porting in the cylinders can't work both ways. So, the Variable Exhaust closes the port for good low end performance, but the guillotine valve moves out of the way with engine compression so that the port can open up for good high end performance. Without the VES, porting is a compromise between low and high RPM performance. So, an engine equipped with VES (or other variable exhaust) should have a bit more power than one without.
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Old 10-13-2010, 04:29 PM   #9 (permalink)
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winter 2000-01 for the 700 with ves Snowtech Magazine - Snowmobiles, Snowmobiling, Snowmobile Techncial Data

600 xc had ves for 2000

2000 xc sp 500 had ves
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Old 10-13-2010, 05:50 PM   #10 (permalink)
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Interesting. That link also talked about triples with VES, I looked at the Polaris website, and the 700 and 800 XCR triples also had VES in 1999. Who'd of thunk it
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Old 10-13-2010, 06:11 PM   #11 (permalink)
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hmmm liberty triples? dont think ive seen one, might have to actually read that
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Old 10-13-2010, 06:12 PM   #12 (permalink)
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The 500 XC didn't have ves in 2000, but the xp sp did. My son has a 500 XC SP 2000.
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Old 10-13-2010, 06:19 PM   #13 (permalink)
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i have actually never seen a liberty triple before, weird
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Old 10-13-2010, 06:55 PM   #14 (permalink)
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Quote:
Originally Posted by ped917 View Post
is that a good or bad thing? I have been reading alot about the crank issues with this motor. From what I have gotten out of it, the non VES engines are alot better?
The cranks are the same on VES and non-VES 800 engines and they all are subject to the same problems.
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Old 10-13-2010, 06:56 PM   #15 (permalink)
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i have actually never seen a liberty triple before, weird
This is not a Liberty- it's a Fuji.
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Old 10-13-2010, 07:00 PM   #16 (permalink)
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i think only the libertys have ves too, no fujis with it
The 1999 XCR700 is a Fuji with valves as are all XCR800 engines.
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Old 10-13-2010, 07:25 PM   #17 (permalink)
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ahhhhhh right you are, Quoted from snowgoer mag: "The 794cc liquid-cooled Fuji triple is in its sophomore season. Three flat slide 38mm carbs feed the NiCaSil-lined cylinders through case reed induction. Digital CDI lights the fire and the spent charge exits through triple exhaust ports. "


Those ports change in size for maximum output at all rpm levels, thanks to Polaris variable exhaust system (VES). Polaris and Fuji engineers revised the system slightly for 2000 to make the engine fit in the smaller Gen II chassis. But, while they were at it, the engineers tweaked the system to gain about 3 hp, according to Polaris officials. They also used new springs in the VES that are quite similar to the ones suggested in a Polaris service bulletin last winter. Early season dyno pulls on the 2000 engine back up the Polaris hype: racers are getting 155-157 hp out of the triple in stock form, compared to a generous 152 hp last year. The power hit is immediate, with a broad and steep powerband.
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Old 10-13-2010, 08:32 PM   #18 (permalink)
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Sweet engine, hawkster! Gotta love the sound of those triple/triples!
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Old 01-07-2012, 03:31 PM   #19 (permalink)
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so after all this, I have a 99 RMK 700.....does this have the VES? Does it really make a big difference?
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Old 01-07-2012, 06:20 PM   #20 (permalink)
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No it does not, and you wont notice. Those engines are monsters by themselves! I have the 600cc version of the "big block" Liberty. Yours should look identical to this. The little black squares by the exhaust ports on the pics a few posts above is what an exhaust valve looks like. If yours had it it would be called the small block and have those black valves directly above the exhaust Y-pipe.
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