Kawasaki ATV Forum banner

1 - 5 of 5 Posts

·
Registered
Joined
·
7,254 Posts
Discussion Starter #1 (Edited)
Ok, this seems to be an on going thing for a couple of people that can't seem to understand it.
Z mann dynoed on a chassis dyno, the 764 that we built back around 2005-2006. The 764 made 93-94HP compaired to a same setup 730 at 98-100HP.
Here is a dyno chart, thick lines are the 764 and thin lines are a 730.
Z dynoed the 93-94HP 764 at almost 69RWHP. The same setup 730 with stock carbs at 90HP shows 63-64RWHP and also still shows 63-64RWHP or slightely less with 36MM carbs even though they add 10HP.
As you can see from the engine dyno graph, the 764 does make more low RPM power, so it shows higher RWHP numbers even though it actually makes less HP.
 

·
Premium Member
Joined
·
11,525 Posts
Ray, you don't think the extra 25 pounds of torque of the 764 at 3700-3800 rpms help the 764 launch much harder than the 730?

The carbs is easy....you just can't go by peak HP, you have to look at the whole chart. You'll see that the 36mm carbs hold the power longer than stock carbs with stock intakes.
 

·
Registered
Joined
·
7,254 Posts
Discussion Starter #3
Ray, you don't think the extra 25 pounds of torque of the 764 at 3700-3800 rpms help the 764 launch much harder than the 730?

The carbs is easy....you just can't go by peak HP, you have to look at the whole chart. You'll see that the 36mm carbs hold the power longer than stock carbs with stock intakes.
Yes it does, like I have said about 100 times already, if you have a setup and conditions that can use that extra low RPM power for the first 5-10ft. That was the only reason that motor left here, it was going to a duner and we thought maybe the extra low RPM power would make up for the loss of peak HP. In a trail setup it didn't. With a bit of a drag setup it can, same as a bolt together 800 or 820 with old style cams, you get more low RPM power but less higher RPM power. If you can use that low RPM on launch, you gain a little but you have to gain enough in the first 5-10ft to make up for the higher peak HP motors coming catching you before the end of the track.
Ray
 

·
Premium Member
Joined
·
11,677 Posts
Ray, have asked you over and over again what "set up" you are using to compare your motors... you dyno them all with stock carbs? 36's and stock intakes? What exhaust?
 

·
Registered
Joined
·
7,254 Posts
Discussion Starter #5
Ray, have asked you over and over again what "set up" you are using to compare your motors... you dyno them all with stock carbs? 36's and stock intakes? What exhaust?
Sorry Rich, this is the first time I seen you ask.
The two engines in the above dyno sheet, the 764 and 730, were both ran with 36mm carbs and stock intakes. The 764 had old Trail cams and the 730 had old race cams. Both were with Muzzy V force exhaust, I'll have to look again and see it they were the Pro pipe, that might have been before the Pro pipe was out.
Ray
 
1 - 5 of 5 Posts
Top