thanks,
most my work for the last few years on raptor stuff is posted here: http://www.moddedraptor.com/community/dyno-tuning/

here is STOCk Rap 700 for a Base to compare too


http://i23.photobucket.com/albums/b3...kraptor700.jpg

there is a ton of potential on these motors from mild to wild on small cc size..

here is a 700(686 cc) we did for a customer, using Cuervo racing +1 mm ported head 14:1 compression, drag pipes, 54 mm throttle body and .500 lift cam...
a far cry from what you guys are building them for though and the powerband needed for this application as well
http://i23.photobucket.com/albums/b3...ks/sbss700.jpg

http://i23.photobucket.com/albums/b3...s/DSC01501.jpg

thats alot of lift.....wow!!:happy6:

its all necessary for power, on a .400 lift camshaft you will be restricted to around 65 hp even on a ported head.., just wont allow enoug air in.. weve been debating doing a camshaft similar to our HDD5050 grind but in a more moderate .445 range on the intake side

On the Conversion I am working on, I am looking at not losing any torque low/mid rpm (note the standard Raptor is well down on a XT in torque)

Fitting a HC2 to a XT, loses bottom end power and torque. Big Bore

I personally think that the Big Bore is the way forward....for CHEAP power and torque gains throughout the rpm range.

But is a Big Bore reliable?

..but Strokers too....for development reasons

When i had an xt686 with cp piston and stage 3 reprofiled xt cam i had a lot more torque with 12:1 compression than the raptor, HP was 65-67 on the wheel and max torque:75!

Steve was that 75nm or 75 ft/lbs of torque?

its 75nm of torque on the dyno,i calculated it in ft/lbs its 54.5 about the same with the 80hp raptor torque but mine had less compression,smaller TB,and less lift cam

Nice.

it really depends on what you consider "more" torque///

off idle and low rpm torque is good for cruising but what you really want for a fast bike is a broad and flat torque curve that carries into the upper rpm's

calculate the torque output by averaging the torque number at 3k,4k,5k,6k,7k, rpm's

some peak torque is lost when opening up the top end but well worth the trade off