I'd rather have a 95" or 100"+ HD V-twin! More torque, and AWESOME potato potato idle!

 

choperbills number sounds much more realistic. that would be 10hp more than the 500ho. 78hp will be dangerous. so chopperbill, u got a confermation on the sp700? was it from a polaris rep?

later
jon

 

aaen claims 61 hp out of there stage 4 kit for 1400 on the 400 sc at 6400 rpm. that would make the scrambler like super fast. i know this is 2 stroke and 500 is 4 stroke right.

 

Chopperbill,
I am disappointed in your response and the other expert engine builders on this forum. Do any of you even realize what the 500 is,apparently not.
Liquid cooled,Dry sump,overheadcams,4 valves per cylinder are features generally associated with high rpm race engines. Everybody laughed and said FORD'S 4.6 would not work.That it could not make low rpm torque,now 5 years down the road nobody questions what computer modeling and engineering can do for the internal combustion engine.you claim you love polaris and think there the best,But have little faith in there engineering department. Again we (Bert and I)did not say that that particular engine would make it in production
units,just passed along some interesting info.

I want give any names for my sources,But I will tell you my 800twin came straight from polarises sled racing dept.

PS. A real good example to ponder, back in 1977 FORD claimed a hefty 134hp and 242 ft.lbs of torque for the 302. Nowdays 350hp, 350ft.lbs torque out of the same 302 are made with less emissions better fuel economy and last longer.
I don't think polaris made it to the number 2 spot in the last 5 years by following somebody elses lead after all thats why we buy them.

 

It's probably a good thing polaris doesn't offer that much power. If you ride your quads the way you think about them(you know who I'm talking to) you'll be in over your head and riding ability and probably get hurt,and then want to sue polaris for giving you what you asked for.

 

I would have to say that a figure in the mid 50's for horsepower would probably be fairly easy to achieve. I was looking at my dyno charts the other day for my TLR which is a V-twin not an in line twin and is 996cc instead of 725cc. At around 6000rpm it makes around 80hp but the big thing is torque. It also makes about 80ft-lbs of torque at that same rpm. It tops out at 126HP at about 11000rpm. This is measured at the rear wheel. I agree that high horsepower is not what we need or want in this type of quad. We need low-end torque and mid-range punch. This would give it very trail worthy manners. If it was a sport quad things would be different. I would say tweak it till it screams. Based on the above figures and the bike not being highly modified to get these numbers I would say about 55HP would be easy to get and reliable as well. You could modify it to the 75HP or what ever your budget permited.
As far as arguing over sources and info, who cares. It's not even in production yet. When it gets here then we can critique it. For now all we should hope for is that when it finaly does arrive it has more oomph than the HO and stronger drive line parts so all of you that like to modify things can have some better parts to beef up your current tricked out 4x4's

 

800twin: Where did you get the idea that I was an expert engine builder? Never said I was, never insinuated I was. If your are disapointed in my comments or opinions, so be it. I still don't think you need 78 hp in a utility quad, twice what we have now. I don't think 99.9% of the riders out there need it either. In a sport machine for you racers, ok. You make utility quads that do 100 mph ( and I think that is only reason you would need 78 hp.) and we will go the way of the three wheeler if Gore doesn't get us first. Of course that is just my disapointing opinion.

 

Colorodo,
Your last statement was well put. Sometimes I get a little carried away getting people to understand whats possible. Negative thinking people get under my skin.

Chopperbill,
I did not say we needed 78hp.

 

I sure could use the 78 horse gotta turn the big tires. and too much is never enough.

 

No such thing as to much horsepower.