Oh yea, those ds's can be built up real big, but, if you took a ds and a 660, an gave them the same cc, bore and stroke, like say...720 for instance.What would come out on top?Both evenly matched in the cylinder, same brand and model pipe(ct racing), same intake(pro design), and same tires of course.That would be something to experiment, the top 3 big bores stock, modded, and everything else....AT THE DUNES....That would be a great video/magazine article/fun for us/ummmm/...../idk what else to say..../oh yea....a learning experience...=]

 

You know how much more money your spending on that 686 kit to make that raptor 660 faster, when you could get the 700 and spend less money on mods and still make it faster. Thats just my 0.2

 

A piped DS makes about 5 more horsepower than a piped 660 for whatever reason. That isn't enough to overcome the weight disadvantage. The DS weighs in at about 75 lbs more than a 660. DS would need a curve of about 54 hp to run with a 45 hp 660. Most DS motors need a little more than a pipe and filter to hit the 55 hp mark. This is especially true since the 660 makes almost identical torque.

Now we really are off track. Sorry.

I agree, I would like to see a big bore shootout. When is Craycraft going to have a race motor for the 700R? I bet it is a screamer!

Ron

 

I have a 2004 660r Raptor with a trinity big bore 780cc kit I have not yet had a chance to rae a 700 but I do not think it would have a chance

 

I'm an Automotive Powertrain Calibration Engineer, the way to look at this can't be based on what is the easiest quad to make faster. ANY ENGINE CAN BE BUILT UP TO PRODUCE MORE POWER. it can be a chainsaw or V12 Ferrari.

Let me use this analogy. A carburated 660 compared to a EF 700r is somewhat like comparing a 1969 Mustang to a 2008 Mustang. The technology is completely different.

You can build both mustangs to get 300hp, but the 2008 is going to get better fuel economy because the combustion of the computer controlled spark and fuel maps allow you to maximize efficiency at all operating points.

Any decent mechanic can take a 69' Mustang throw, headers, a cam, and a double pumper carberator and get 500hp.. its a little different with the '08. But thats not to say that on '08 can't produce 500hp...

The engineers that develop the 650Hp Saleen Mustang use a lot of expensive equipment such as a dyno, flow bench for the head, and a computer with calibration software that can analyze the combustion with cylinder pressure transducers. This is the only real way to find spark MBT and to know how rich you really need to get the A/F ratio.

It is important to understand that you don't have to be rich to reach spark MBT in an engine... adding fuel in this case is just a waste. Its things like this and improving air flow into the head that makes a 650hp engine with the same displacement get 5 mpg better fuel economy then a 69' engine with the same power.

And thats not even getting into all of the transmission gearing.

<u>So, the 700r is more then capable of going against any 660... its more of a reflection of the builder then it is the quad.</u> It still comes down to basic thermodynamics. More air, gives you more fuel, the more fuel, gives your more combustion energy, more energy gives you more power to the wheels. Right now it is probably EASIER to do that with the 660.

It is also important to state that the computer in the 700r or even any automotive computer can only compensate for so much when you start throwing aftermarket pipes and head work at them. They are calibrated for the stock engine components. Unless the 700r has a mass-air-flow sensor on it, its computer doesn't know that it is getting more air through heads or that it has less back pressure from the free flowing pipe.which means the open-loop fuel and spark tables won't be cross referenced correctly for that set up, if it doesn't have on O2 sensor it won't be able to closed-loop on the fueling it will just run lean with that set up. When a professional builder shows you a dyno report of 55hp... well you to set up your computer, heads, pipes.. everything the same way he did. Can't be mismatching hardware and expect the computer to be ready for it.

 

This thread is ancient.

 

The 660 and the 700 are about the same in performance if you like dust.

 

700R IS BY FAR ONE OF THE BEST ALLAROUND ATV'S YOU CAN BUY

 

<div class="FTQUOTE"><begin quote>Originally posted by: Kodiak660

Also the 700 has a 4 valve head while the 660 has a 5 valve head.</end quote></div>

And thats a advantage in some way?

 

My two stroke mxz 670 ho puts out almost 130 hp stock and does 0-60 in just over 3 seconds stock.What do you think a stock RAPTOR does 0-60 in?I thought it was almost as fast but maybe not, actually ,no way.Good game,go pats.