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what makes this motor a low hp motor

This is a discussion on what makes this motor a low hp motor within the Engine and Drivetrain forums, part of the Technical category; its got the displacement of motors in other atvs that make double the hp. What is it that chokes this motor so badly?...


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  #1  
Old May 3rd, 2009, 06:16 AM
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what makes this motor a low hp motor

its got the displacement of motors in other atvs that make double the hp. What is it that chokes this motor so badly?
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  #2  
Old May 3rd, 2009, 06:21 AM
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Re: what makes this motor a low hp motor

well i thought the 749cc kawi v-twin makes 52 at the flywheel. Doesnnt this motor make around 50 at the flywheel? If so it not bad off. I think it just old technology as long as it will last im fine with but if they ever put the 850 in a rzr mine is gone the day of.
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Old May 3rd, 2009, 06:29 AM
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Re: what makes this motor a low hp motor

I do not know the answer but I sure going to watch this thread of yours. I would like to know the answer my self. Went on a poker run on Saturday and i was the only rzr there and was being smoked by 400s and 500s sportsmans. there was a can-am 800 there that burnt the lugs off on a burn out on pavement and he was not using his front brakes! and did hit 70 mph, out ran a new toyota tundra.
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Old May 3rd, 2009, 06:39 AM
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Re: what makes this motor a low hp motor

Let me add, these 4 wheelers dont turn near the rpm's that out rzr's do. why?
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Old May 3rd, 2009, 07:13 AM
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Re: what makes this motor a low hp motor

my old kawi v-twin turned more rpms's
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Old May 3rd, 2009, 07:36 AM
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Re: what makes this motor a low hp motor

Double the HP? Show me one. Other than the 850 in the new sportsman xp, the can-am 800x is the most powerfull quad engine, and that makes HP in the mid-high 60's which is what...10 or so more hp then the RZR-s 800HO? And Can-am has always had the reputation of high HP motors. Double the hp....dont think so unless you are talking a built motors, and you can make as much power as you want, just depends on $$.

as for the speed comments, its not so much a lack of power, its the weight issue that makes the RZR a little slower than the quads. My raptor 700 will smoke the RZR from start to finish, and it has a smaller motor that makes less hp than the RZR 800 does...but it weighs less than half of the RZR.

Last edited by Langford; May 3rd, 2009 at 07:40 AM.
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Old May 3rd, 2009, 08:25 AM
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Re: what makes this motor a low hp motor

Its all about power to weight ratio. A four-five hundred pound quad has a huge advantage over the 1000+LB RZR. Also most everyone on here is way over stock weight with all the Stuff they add. Heavy roll cages ,Subs, Speaker boxes, Full sized batteries, Larger wheels and tires ect ect. all this stuff adds up quick. I've seen several RZRs on here that are probably double stock weight lol. Thats going to slow you down.
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Old May 3rd, 2009, 08:38 AM
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Re: what makes this motor a low hp motor

Quote: Originally Posted by Langford View Post
Double the HP? Show me one. Other than the 850 in the new sportsman xp, the can-am 800x is the most powerfull quad engine, and that makes HP in the mid-high 60's which is what...10 or so more hp then the RZR-s 800HO? And Can-am has always had the reputation of high HP motors. Double the hp....dont think so unless you are talking a built motors, and you can make as much power as you want, just depends on $$.

as for the speed comments, its not so much a lack of power, its the weight issue that makes the RZR a little slower than the quads. My raptor 700 will smoke the RZR from start to finish, and it has a smaller motor that makes less hp than the RZR 800 does...but it weighs less than half of the RZR.

I know were not talking the same motor, but to give you an idea what mine can do now....raptor 660-I kill it -anywhere anytime....kawi brute-rolling start up olds-dead even.kawi from a dead stop..i kill him.... banshee flat drag..he gets the jump then i run him down... it's all hp+weight+traction
here a drag vid between rzr's
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  #9  
Old May 3rd, 2009, 08:45 AM
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Re: what makes this motor a low hp motor

Very true, my little mind dident think of weight to power... Maybe polaris will some day see that our rzr are to big for there motor, need to over size the motor for the rzr like they do to there 4-wheelers. I have no one to compare with around here, im the only rzr owner around here. every one get the biggest and badest 4-wheelers money can buy. I have a 2004 suzuki venison 500, havent road it seance I got my rzr in sept. I love it
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Old May 3rd, 2009, 09:09 AM
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Re: what makes this motor a low hp motor

Quote: Originally Posted by bigmike58 View Post
Quote: Originally Posted by Langford View Post
Double the HP? Show me one. Other than the 850 in the new sportsman xp, the can-am 800x is the most powerfull quad engine, and that makes HP in the mid-high 60's which is what...10 or so more hp then the RZR-s 800HO? And Can-am has always had the reputation of high HP motors. Double the hp....dont think so unless you are talking a built motors, and you can make as much power as you want, just depends on $$.

as for the speed comments, its not so much a lack of power, its the weight issue that makes the RZR a little slower than the quads. My raptor 700 will smoke the RZR from start to finish, and it has a smaller motor that makes less hp than the RZR 800 does...but it weighs less than half of the RZR.

I know were not talking the same motor, but to give you an idea what mine can do now....raptor 660-I kill it -anywhere anytime....kawi brute-rolling start up olds-dead even.kawi from a dead stop..i kill him.... banshee flat drag..he gets the jump then i run him down... it's all hp+weight+traction
here a drag vid between rzr's
I have watched your video many times in the past few days , that thing is insane. Yours does make double what any other quad motor makes, but it is nowhere near a stock quad/utv motor. When it comes to modifications, or aftermarket motors...you can make as much power as your wallet will allow. A guy I know has a YFZ 450 that makes over 100hp on alcohol, and it is in a quad that weighs under 300lbs...one hell of a power to weight ratio there.


But you are right, traction is a major thing that I didn't say. You can make all the power in the world, but if you can't put it to the ground...what good is it? That reminds me of a quote I heard a few years back at the drag strip...what does a 700rwhp supra, 800rwhp supra, and a 900rwhp supra have in common? They all run 11's.
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  #11  
Old May 3rd, 2009, 10:45 AM
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Re: what makes this motor a low hp motor

Quote: Originally Posted by Lloyd Smale View Post
its got the displacement of motors in other atvs that make double the hp. What is it that chokes this motor so badly?
This may be an oversimplified answer, but here is a theory:

Since shoving more fuel and air into the stock engine with a turbo kit will double the stock HP, then would it make sense to say that it is the air intake, fuel delivery, and exhaust that "chokes" the stock naturally aspirated engine?

Oops,, I answered your question with another question!
Maybe someone else can expand on my idea and offer another theory/answer!

:rzrs:
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Old May 3rd, 2009, 11:04 AM
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Re: what makes this motor a low hp motor

Although the intake is restrictive in some ways... the reason the turbo works so well is you're adding not just flow but pressure into the cylinders, it's basically adding twice the air density of a stock unit. Atmospheric pressure is 14.4psia and if you're boosting another 14psi on top of that, you're basically putting 2 atmospheres into the cylinder instead of one.

I wouldn't say it's being "choked" although and intake and exhaust DO help, it's not double the power like a turbo. There's always sacrifices. Sure, you can get a more free flowing exhaust, but it's going to be LOUD AS CRAP as some have found out.

The motor makes great power for it's size and use, I'm not exactly sure what the OP is expecting. It's NOT a high-dollar engine like you'd find in a sport bike... it's designed to be durable in mud/water/snow/sand and run reliably (assuming your intake isn't sucking in dirt of course).

Hopefully, they'll drop the 850 in next year, and give the RZR a 15-20hp boost.
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Old May 3rd, 2009, 11:18 AM
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Re: what makes this motor a low hp motor

Your not going to see Polaris eek to much more out of this engine if any at all. You have to remember MFGs don't build race engines for these things because the reliability would go way down. They try to walk the line of good performance with reliability. Its better to just build a larger displacement engine then it is to max out a smaller one. Atleast as far as reliability is concerned. You start upping the compression, raising the Revs ect ect you start having more problems.

Sorry to say to keep up with quads with 800cc engines your going to have to figure out how to make a RZR weight the same as the quad lol or atleast double the Engines HP I'm sure the only reliable way to do that is replace the engine I wouldn't mind more low end to spin the tires ect. But I could care less for more top end. I guess on dunes that comes in hand, But trail riding or even just on the road 60 MPH is pretty fast. These things are heavy and built pretty weak compared to a car. Just a few days ago there was a pic on here of a RZR that hit a tree going 20mph.. It was crushed. 30-40 they probably would have been killed.. 60Mph they would have been a wetspot.
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Old May 3rd, 2009, 11:19 AM
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Re: what makes this motor a low hp motor

Your not going to see Polaris eek to much more out of this engine if any at all. You have to remember MFGs don't build race engines for these things because the reliability would go way down. They try to walk the line of good performance with reliability. Its better to just build a larger displacement engine then it is to max out a smaller one. Atleast as far as reliability is concerned. You start upping the compression, raising the Revs ect ect you start having more problems.

Sorry to say to keep up with quads with 800cc engines your going to have to figure out how to make a RZR weight the same as the quad lol or atleast double the Engines HP I'm sure the only reliable way to do that is replace the engine I wouldn't mind more low end to spin the tires ect. But I could care less for more top end. I guess on dunes that comes in hand, But trail riding or even just on the road 60 MPH is pretty fast. These things are heavy and built pretty weak compared to a car. Just a few days ago there was a pic on here of a RZR that hit a tree going 20mph.. It was crushed. 30-40 they probably would have been killed.. 60Mph they would have been a wetspot.
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Old May 3rd, 2009, 11:41 AM
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Re: what makes this motor a low hp motor

Quote: Originally Posted by 8ball_99 View Post
Your not going to see Polaris eek to much more out of this engine if any at all. You have to remember MFGs don't build race engines for these things because the reliability would go way down. They try to walk the line of good performance with reliability. Its better to just build a larger displacement engine then it is to max out a smaller one. Atleast as far as reliability is concerned. You start upping the compression, raising the Revs ect ect you start having more problems.

Sorry to say to keep up with quads with 800cc engines your going to have to figure out how to make a RZR weight the same as the quad lol or atleast double the Engines HP I'm sure the only reliable way to do that is replace the engine I wouldn't mind more low end to spin the tires ect. But I could care less for more top end. I guess on dunes that comes in hand, But trail riding or even just on the road 60 MPH is pretty fast. These things are heavy and built pretty weak compared to a car. Just a few days ago there was a pic on here of a RZR that hit a tree going 20mph.. It was crushed. 30-40 they probably would have been killed.. 60Mph they would have been a wetspot.
Yep, the sand is where the hp really shines... heres a video of robert "strracerx" climbing china wall and then me with 3 times the power...8 sec's vs 23+sec's

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