Took another look at the graphs......

Here are some standard formulas determining torque and Horsepower:

horsepower = rpm x torque / 5252
torque = 5252 x horsepower / rpm

HP and Torque are always the SAME at 5252 rpm's! Accurate graphs should indicate this rpm at the point where HP and Torque intersect.[img]i/expressions/face-icon-small-confused.gif[/img]

 

Check out MichaelAZ's graph on this same board......

Click Here

It crosses where it should.....

 

Those HP# are very impressive.... And this is on pump gas??? Sounds like your compression is low enough that you could retard the timing a little bit and spray a 25 or 30 hp shot of nitrous... Will this bike be used for drag racing??? If you could, post some pic's....

 

gee your not the first one on the block to know that dyno sharts much cross in the 5200rom range this is nothing new to me. im not doubting the dyno curves, im saying the trinity dyno is off, thats all. and their is no damn what he build that motor for $1k, i call BS

 

Those are nice #'s but why wait till 6 months after you dyno'd to post them ? Im not hating but I simply dont see how you can build that motor for under 1K . Who did the port work ?

 

Thats what I understand also but his dyno crosses at 4900. I was one of the first trinity686's and I know first hand the "orange county correction factor"

[img]i/expressions/face-icon-small-shocked.gif[/img] [img]i/expressions/face-icon-small-confused.gif[/img]

 

You can say all you want! Your assuming too much, first everything that I had done was already setup by a flat track racer. He started a family and had complete raptor top ends lying around. I bought the entire top end for 760 - a piston, and then sold my stock top end to some one who blew up theirs for 600. Then found a guy selling FCR's on eBay that screwed up on spelling and some how I came across it for 500 w/ intake. Then got a JE 12.5:1 piston slapped it in 150, already had the Sparks X-6 exhaust. The engine I bought was a Mickey Dunlop 690 kit, over sized valves and springs, porting, cam the whole nine. The receipt from MD was 3000 +, the guy basically gave it away so I just lucked out like no other. I was going to install a Carrillo rod but since my raptor is still pretty new (ride time wise). I really don't have much time to ride it now but I just couldn't pass up those deals. I tried to get an EFI kit but the throttle body was on back order so I passed. So total with the cost of Trinity dyno tuning it comes to about 973 + or -.

I don't plan on racing my bike; I just wanted more power because I'm 6'4" 250.

Kev

 

Sounds like a nice motor but since it cost 3k and you put 1k into it , you now have a 4k motor ? Still very nice #'s none the less and since Im 6'1 ,250 , it sounds like a race in the making [img]i/expressions/face-icon-small-smile.gif[/img]

 

Sweet looking raptor, what size paddles in the rear are you running? I just ordered the black c-series for mine, my whole theme is back.

Kev

 

kevin, its all making more sense now, im surprised though you got that number out of a FST 690. buy who did you head work.

im 6'4 and 250, and try to keep up, i'll loose most likely but ill look good doing it.