XR650R Dyno Charts Return to the XR650R page
The Idea was to test between the Mikuni and the Edelbrock....After I had my bike turned from a XR650R into a 680R Baja Racer. Rob Barnum tried to talk me into a Edelbrock. When he was running a special on it. They were back logged so, they were even less then the sale price of $399. I told him I WOULD GET IT ONLY IF HE WOULD SPEND THE TIME TO RUN THE TEST of the two carburetors on the dyno. He said yes and I bought my Edelbrock from http://www.barnumspro.com/proproductweb_055.htm.
DYNORUN.023 Borynack’s 680cc with Edelbrock over bore 40mmX42MM RO
Wisco 11: 1 compression 102.5mm piston, Barnum’s mid
HDVS, Moriwaki Full Exhaust, 14/48 gearing, 4th gear run @ 2500rpm
Edelbrock set @ 19E @ 13 out.
DYNORUN.002 Borynack’s 680 with Mikuni TM40 140 main 27.5 pilot
RO
Wisco
11: 1 compression 102.5mm piston, Barnum’s mid
HDVS, Moriwaki Full Exhaust, 14/48 gearing, 4th gear run @ 2500rpm
These are switched on the colors…Just the opposite.
To
start off with all the Edelbrock guys are the best
. This was most of the day. Rob
Barnum met me at Edelbrock (1-877-888-7504) to run the Dynamometer runs at 
)
and met the others. We started with
my Mikuni. It was tuned for a Stock engine with Uni, holes in the cover XR’s
Only Header, R4 muffler (with spark arrester screen), stock engine. I did not
have time to tune it for this engine so; we ran it as it was and spent no time
adjusting it for max horse power.
Then we put the Edelbrock on. The Edelbrock has an elliptical venturi of
36mm X 42mm I was told if you do the math it is a little smaller then 40mm.
Which is perfect for a stock bore, giving even more torque through out. The
Mikuni is a tad over 40mm. Now this engine has had the Barnum’s touch done to
it. The stock Edelbrock turned 55.2hp and 45.8 torque. Not bad! More torque.
But, this engine can breathe! It's not a XR650R anymore and with the 3mm over sized intake valves and huge
Moriwaki Exhaust you could tell that stock Edelbrock just wasn’t big enough
for the amount of flow this engine wanted. So, Barnum took it into the shop and
had the Edelbrock bored out to be 40mm X 42mm…..I always like bigger so I was
fallowing right along. He started
the BRP and gave it a test run ……Two clicks leaner and we got the biggest
reading of 56.9hp and 46 foot pounds of torque. There was a good dip right
before 3,500rpm that I didn’t like so, I kind of pushed to see if we could get
rid of it, he said, under load it would go away but, I wouldn’t listen. After
going as rich as we could on the accelerator pump and a little richer on the
needle adjustment we got the charts we have above. Nice thing is this is more
horse power then the XR680R Barnum ran in the Baja and all his races last year!
This is his new bike engine! It has quite an over rev., my bike cut right off at
the 8,200 rev limiter. He has a one pound lighter fly wheel and other great
stuff. We both have Carrillo rods, S/S valves (mine has 3mm over sized intake
his stock size) mine has his Barnum's mid cam, he has the most radical cam. It
made me feel like I had a bike
My Bike against Barnum’s Baja Racer!
DYNORUN.023
Borynack's 680cc with Edelbrock over bore 40mmX42MM RO
Wisco
11: 1 compression 102.4mm piston, Barnum’s mid
HDVS, Moriwaki Full Exhaust, 14/48 gearing, 4th gear run @ 2500rpm
Edelbrock set @ 19E @ 13 out.
DYNORUN.002
Barnum 680R Wisco 11: 1 compression 102.4mm piston, Barnum’s 155 mid to top
1pound lighter fly wheel, 40mm X 42mm Edelbrock with 18E @ 14 out, Barnum’s pro exhaust
To into one, with no end cap.
Here is a chart to compare a (all bikes have Edelbrock
Carburetors)
Stock Bike,
Bike with HRC 11:1 piston and Hi
lift web cam, with Barnum’s Exhaust wide opened.
My
bike.
Stock bikes off the internet Dyno
charts are showing 38hp. Uncoked 44hp. Stock engine with all the goodies 48. HRC
cam and piston 53hp~64hpand more!
For all you guys looking for 64+
hp numbers Barnum says there just not there. You might say they have the
stingiest dyno on giving up big numbers. He showed me tons of charts…some are
on this page. He showed me as he changed the dampening and calibrated the rpm of
the bike to the dyno the numbers changed…..He asked, "What number do you
want" and I said, "honest numbers" So, bottom line on getting big
numbers on Horse Power out of the XR650R or XR680R is not possible on this dyno
with an honest guy running it. There best run ever with the most radical XR680R
on this Dyno was Just over 58 Horse Power. That was a 13:5 compression piston, 100% race
gas, biggest cam they could use, ported and polished to the max….you get the
picture…..so, they say 'hog wash to those big numbers that come out of Europe'!
To give you an Idea of different Numbers from different Dyno’s here is some
charts off the web and to compare to these dyno charts we have here. One is of a
HRC bike setup and he got just over 52hp compared to the just 49hp on the
Edelbrock dyno. It would be nice to find one of the dyno shops that the big
number come out of to see the difference in Dyno’s and the operator. On the Edelbrock dyno there is a
4hp difference. A stock engine bike opened up on there dyno is 43. The main difference from the
XR650R with all the extra goodies and a pumper is the snap and power now! The
difference between a pumper and the Edelbrock pumper is you get all that with
tune ability anywhere any time. It
will start every time….even after a crash. I may take the time it takes to get
the Mikuni to run at it’s best for this engine some time….when I have
lot’s of it…..time. I really liked how perfect the power curve was on the
TM40….it’s because it has so many jets to tune to make it that way. I am
sure with time I could get a few more horse power out of it. But, that’s what
I didn’t have to get it ready in time
I’ll
be changing this after I give the bike a big test ride to see if the Edelbrock
is as smooth as the Mikuni……There is no way you could ever talk me into
going back to a stock Kehin carburetor. If you want the best package, easiest tune
ability, start every time, right price, best tech support, get an Edelbrock
Update!
Went to Dyno-Dudes in Moreno Valley. They have a Calibrated Dyno. They don't mess with the number but, again say they can be messed with by changing the CF rating and the Smoothing (Dampening). One of the operators lives next door to Hengeveld. He said he knows both Hengeveld and Campbell. He hasn't had there bike on the Dyno. The Dynamometer was in a controlled environment. Completely closed off. I got to take these pictures as they were finishing...getting ready to take the bike off the Dyno.
Here are the Dyno Charts from the Dyno-Dudes
Blue Run (bike leaned out) max Power = 58.47
Red Run as is(as the bike was ran at Edelbrocks) = 57.23 At Edelbrocks we got 56.8hp with the bike setup like this. Our best run was 56.9hp
As you can see there is only .4hp difference from the Dyno Dudes dyno, to the one at Edelbrock. We leaned it out (2) clicks and had the UNI air filter with No-Toil on it for the Blue run. Your air filter can make over a horse power of difference!
Here are the off the Internet Dyno charts:
These next text two charts are of Phil Kemp's bike. If you would like to know more of this bike 'E' mail Phil Kemp at countjocular@hotmail.com
This is another dyno chart off the web.
Stock and HRC Cam
All the Dyno charts I could find. I would be grateful if you can find more, to let me know Home@borynack.com
This one is stock and then un-corked: http://www.xrdualsport.com/images/project/dynorun.jpg M
Bruce Borynack XR650R Home@borynack.com
