Topic: Post your Dyno Graphs here.

[lucky]

Dynojet dyno,
1134cc,
71mm Honda RC45 pistons,
Honda DOHC900 crank shaft,
Honda DOHC1100 conrods,
SOHC F2 head (modified),
.400mm lift long duration cam (since changed to Megacycle 125-75 cam),
Methanol fuel.



Cheers,
Brian

Thanks for posting a file format that can be seen by all computer users.
Would you all post a JPG or a PDF file. Thanks.
Many file formats can be saved as a PDF file.

[lucky]

hello friends,

there are many here enjoy to see those dyno graphs, me too.
but think of the fact, that the graphs are relatively worthless without posting some infos, such as:
sort of fuel, some technical datas, displacement,.....

mec

Exactly!

[OpaGreg]

the details:
1978 CB750K, 25,739 miles on the clock
Totally stock bike, all original as far as I can see except for the battery and wheel bearings
Dyno run was for evaluation just after I bought the bike
21 Feb 2012
Dynojet
Run Type: RO
Run Conditions: 58.29 degrees F, 29.98 in-Hg, Humidity 17%, SAE: 0.95
Max Power:  49.19
Max Torque: 35.88
end result right about what I would expect out of the stock setup and looks like the carbs could be adjusted a little better

[MRieck]

the details:
1978 CB750K, 25,739 miles on the clock
Totally stock bike, all original as far as I can see except for the battery and wheel bearings
Dyno run was for evaluation just after I bought the bike
21 Feb 2012
Dynojet
Run Type: RO
Run Conditions: 58.29 degrees F, 29.98 in-Hg, Humidity 17%, SAE: 0.95
Max Power:  49.19
Max Torque: 35.88
end result right about what I would expect out of the stock setup and looks like the carbs could be adjusted a little better

You do know if it was a K0 it would have made 65HP. 50HP is about it stock.

[Sam Green Racing]

So if these old bikes loose 17bhp through the transmission, It means I have a mate who has one that makes 115bhp at the crank, hell of a jump from 67.

[MRieck]

So if these old bikes loose 17bhp through the transmission, It means I have a mate who has one that makes 115bhp at the crank, hell of a jump from 67.

We'll have to see what the large engine does. Funny....I can't view my dyno chart on the is thread...at least that was the way it was last time I checked. Hmmmmmm....you cannot open/enlarge any of the charts on page one.

[bwaller]

My dyno guy doesn't feel it's necessary to strap the rear end down. What's the feeling? I don't suppose there's much to be gained anyway on a 60 hp bike, but it sure isn't hard to do.

[Bill/BentON Racing]

Our dyno guy(Brian Livengood0 always ties them down....real well!! I think it would be better all around and SAFER! My .02. Bill

[MRieck]

My dyno guy doesn't feel it's necessary to strap the rear end down. What's the feeling? I don't suppose there's much to be gained anyway on a 60 hp bike, but it sure isn't hard to do.

Seen that many times Brent. Talk of reduced tire deformation etc when not tied down. I think some straps should be on there....or at least a lard ass.

[Doctor_D]

My dyno guy doesn't feel it's necessary to strap the rear end down. What's the feeling? I don't suppose there's much to be gained anyway on a 60 hp bike, but it sure isn't hard to do.

Seen that many times Brent. Talk of reduced tire deformation etc when not tied down. I think some straps should be on there....or at least a lard ass.

I've only seen hopped-up 2-strokes skip the rear wheel under a dyno operator.(E.g. there's a fully-prepped Honda NSR250R in the shop that builds torque so fast the tire chatters for a second or two.)  But we've had bikes that make 200hp and half as much torque on there without strapping anything other than the forks down.  After nearly 10,000 runs on the Dynojet, there's never been a problem (touch wood).

[bwaller]

Thanks guys. Previously I had to unstrap to get outside to bump start, then idle it to get back in and strap the front down. Finally finished my roller starter which will save all that fooling.

Lard ass isn't an issue Mike, I'm the one sitting on it.    I may try a few pulls with the rear synched down some.

The only thing I notice is it seems to polish the rear tire which I thought might be traction loss, but I suppose that is likely not the case.

[brandEn]

Hit the dyno today with the help of Doctor D. Thanks David! Just over 71 HP.


So I need some leaner carb slides (3.0) for my CR29's if anybody has some...


1978 CB750 F3
CR29 Carbs= Mains 110, YY7 needle-clips middle position.
DYNA 2000 ignition set at 30 Deg total advance
Wiseco 836 kit
Webcam 41a

BrandEns dyno tune @ twinline


BrandEns dyno tune @ Twinline

[Terry in Australia]

76 BHP isn't a bad result Branden, and your bike sunded pretty good too! Cheers, Terry.

[andy750]

76 BHP isn't a bad result Branden, and your bike sunded pretty good too! Cheers, Terry.

I think its 71 bhp if you look at the graph. Bike did sound great though. I thought it would be slightly more though given that my K2 with stock carbs/airbox/pipes/Dyna S ignition gets 71 bhp and its an 810cc engine. Thanks for posting BrandEn and looking forward to seeing more!

cheers
Andy

[Doctor_D]

We had a good time yesterday with Tige and Branden.  Beautiful bikes, both of them.  Dialed in the fuel-curve and timing, picking up a few horses, but also adding a lot of area under the curve and a bunch of useful rpm's.

For what it's worth, our dyno is pretty conservative.  I know of a few in the area that are good "ego boosters", reading 3-4% higher than ours pretty consistently.  It's all relative, so to speak.  Speaking of relative, adding almost 35% more horsepower and 25% more torque with a mild cam, and 100cc's of displacement is nothing to sneeze at.

[HondaMan]

Speaking of relative, adding almost 35% more horsepower and 25% more torque with a mild cam, and 100cc's of displacement is nothing to sneeze at.

Exactly!

[MRieck]

We had a good time yesterday with Tige and Branden.  Beautiful bikes, both of them.  Dialed in the fuel-curve and timing, picking up a few horses, but also adding a lot of area under the curve and a bunch of useful rpm's.

For what it's worth, our dyno is pretty conservative.  I know of a few in the area that are good "ego boosters", reading 3-4% higher than ours pretty consistently.  It's all relative, so to speak. Speaking of relative, adding almost 35% more horsepower and 25% more torque with a mild cam, and 100cc's of displacement is nothing to sneeze at.

I agree. Increasing the displacement a little over 15% and getting 35% increase in power speaks volumes. That 41 cam is very mild too....a lot more potential there for sure.

[Sam Green Racing]

So if these old bikes loose 17bhp through the transmission, It means I have a mate who has one that makes 115bhp at the crank, hell of a jump from 67.

We'll have to see what the large engine does. Funny....I can't view my dyno chart on the is thread...at least that was the way it was last time I checked. Hmmmmmm....you cannot open/enlarge any of the charts on page one.

It don't matter if it's gone we can all vouch for the 98 rwbhp   mine would be the same if it didn't have the TQ Con.

Sam.

[bwaller]

1973 CB500 street bike

591cc, (61mm pistons) 10:1CR, WebCam 58a

Mild porting, stocks valves

Stock PD46c carbs, pilot jets enlarged to #46, 107.5 mains, jet needle #3. Stock air plenum, single large K&N.

Mac header, modified midpipe, GSXR muffler

[tweakin]

1977 cb750f
915cc
APE crank
Stage three head with 5mm conversion
Dyna 2000 @32* advance
RS34 carbs, 127.5 mains

Thanks to Doctor D and Tower at Twineline...  Still need to work out a sticky accelerator pump, but other than that its great.
I am sure there is more power hiding in there but I am happy with the K&N filters and Yamiya pipe.  Rips on the steet

cb750f, 915cc Dyno run at Twineline Seattle

[Doctor_D]

Nice seeing what the 915 can do.  Good times.

Big lean-out on throttle opening is due to the accelerator pump plunger not fully returning, but we got the A/F ratio pretty much perfect after that. (Dashed line on the sheet is 13:1)

The bike peaks at 88 rwhp at about 8k, then HP is flat until it hits the rev limiter.  Between the cam, K&N's, head, exhaust - I'm not sure what the limiting factor is, but the motor's got a few more horses to be found.  Pull the baffle, and put 50mm stacks on it and probably 130 mains and it would likely break 90 without trying.  I'm with Tige though, it's a great, streetable bike - it's time to just ride the heck out of it.

[754]

 What cam is he running ? seems like a very low rpm for the peak...

[tweakin]

What cam is he running ? seems like a very low rpm for the peak...

I am running the 125-75 cam

[Bill/BentON Racing]

Samauto's #'s!!!

1976 CB750A
915cc Cycle X kit
125/75 Megacycle cam(intake 104.5 lobe ctr)
Mike Rieck Stage VI cylinder head port job/5mm stem,2mm over intakes,
3 pc metal Cycle X headgasket
H/D cam chain
Carrillo rods
H/D bolts
Crank balanced/balls gone.
Racing valve spring kit
Ti retainers
32 mm CV's Mikuni,Dynojet Stage III,Bill and Jim Stage X
Dyna S ignition(advanced)
Dyna 3.0 Green coils
Taylor wires
MSD MC-1 ignition box w/rev limiter,analog
Oil pump MRieck massaged
Earl's oil cooler
VP Racing fuel MR12
130 mains,40 pilots,clip 3rd,no filtration/stacks
We lose 10-12 RWHP vs K,F models!!!!!!!
87.07RWHP on 3rd run,since went to 125's and one position leaner on needles
87.07 + 12 = 99.07!!!RWHP!!!!!!!!!!!! 8)Can't wait to see what Calendar Girl does w/915cc and Stage III head!
Total Loss ignition,lightwt rotor,has elec start
Vance and Hines CB1100F sidewinder pipe(open)
We gained 8 h/p and little over 5 ft pounds torque! 8)I like the 915cc package!

Stay tuned,we're going for more!! ::)Bill We thought we had 127.5's found out 130's at Valdosta!

[brewsky]

Updated run 5/26/12:
CB750K8, 43,000 miles
Stock motor
Stock airbox (4 - 1'' holes drilled in rear)
K&N filter
Mac 4/1 (one run w/ moded baffle and one run with baffle removed)
112.5 mains
42 pilots
1 shim under needles
mix screw at 1 out

53.53 HP
38.04 # TQ

Picked up 2.5HP and 4# TQ since last run
Still feeling inadequate on the "high performance and racing forum"!!