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Author Topic: Post your Dyno Graphs here.  (Read 81031 times)

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Offline Sam Green Racing

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Post your Dyno Graphs here.
« on: February 14, 2011, 03:27:06 AM »
Dyno graphs only, no chit chat.

Sam. ;)
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Offline Sam Green Racing

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Re: Post your Dyno Graphs here.
« Reply #1 on: February 14, 2011, 03:28:43 AM »
« Last Edit: February 14, 2011, 03:44:58 AM by SamCB750A »
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Offline Doctor_D

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Re: Post your Dyno Graphs here.
« Reply #2 on: February 14, 2011, 06:39:35 AM »
836cc Wiseco's, 125-65 cam, Mike Rieck stage 4 head, CR29's with 230 main airs, YY7 needles, 70mm velocity stacks, and 138 mains, Dyna 2000 ignition, program 4, 37deg total advance, APE crank, CR750 replica 4 into 4 exhaust (plus a weeping head-gasket, and 3 loose cylinder studs  ;) )



125-75 cam is on the way...
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Take care,
David
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1971 Norton Commando

Offline bear

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Re: Post your Dyno Graphs here.
« Reply #3 on: February 14, 2011, 08:53:33 PM »
Dynojet dyno,
1134cc,
71mm Honda RC45 pistons,
Honda DOHC900 crank shaft,
Honda DOHC1100 conrods,
SOHC F2 head (modified),
.400mm lift short duration cam (since changed to Megacycle 125-75 cam),
Methanol fuel.



Cheers,
Brian

By the by a vid of the old girl on the dyno

http://s1278.beta.photobucket.com/user/yancohotel/media/PICT1792_zps4dcc0c3e.mp4.html
« Last Edit: April 28, 2020, 06:35:40 PM by bear »
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Offline classic bike tuner

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Re: Post your Dyno Graphs here.
« Reply #4 on: February 16, 2011, 03:23:41 AM »
hallo cb four enthusiasts  i am new here  and have a dyno of a "slightly" modified 400
it is 546cc  [59bore] stronger rods [me4] modified head  [smaller inlet canels bigger valves]
modiefied stock carbs
stock cam   stock valve springs  stock crank


« Last Edit: February 16, 2011, 03:31:29 AM by classic bike tuner »
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Offline paulages

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Re: Post your Dyno Graphs here.
« Reply #5 on: February 16, 2011, 10:20:19 AM »
1974 CB550 (slightly modified).  ;D

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Offline Howell

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Re: Post your Dyno Graphs here.
« Reply #6 on: February 16, 2011, 12:01:43 PM »
CB500 tuned by Classic Bike Tuner
http://forums.sohc4.net/index.php?topic=63228.0
« Last Edit: February 17, 2011, 11:34:29 AM by Howell »
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Offline mec

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Re: Post your Dyno Graphs here.
« Reply #7 on: February 17, 2011, 12:47:37 AM »
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
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Offline jaguar

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Re: Post your Dyno Graphs here.
« Reply #8 on: February 17, 2011, 07:48:13 AM »
also listing what dyno it was read on.

i have more time dynoing cars and know that there is a big difference between a mustang dyno and a dynojet
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Offline bear

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Re: Post your Dyno Graphs here.
« Reply #9 on: February 17, 2011, 03:45:42 PM »
Quote from: mec on February 17, 2011, 12:47:37 AM
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

Your right Mec, I have posted what I can off the top of my head.
I,m not playing "Secret Squirrel" and I will chase up more detail.
It's just that I,m not a Tech head so my mates don't burden me with a lot of the Tech. stuff.

Cheers,
Brian
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Offline ivanhoew

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Re: Post your Dyno Graphs here.
« Reply #10 on: February 24, 2011, 07:36:09 AM »
honda 400/4 ,450 yoshimura kit ,stock cam ,8.5:1 cr . ported head .ihi rhb5/1 turbo . single mikuni carb .suck through.clutch failed at 85 bhp . chassis dyno sun ram 12 twin roller eddy current loaded type .




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Offline odiewan

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Re: Post your Dyno Graphs here.
« Reply #11 on: March 14, 2011, 12:42:18 PM »
73 CB750 with Pod, Carpy 4 into 1.
Idle jets: 40
Clip position: unknown
Main jets: 130
Power pretty much peters out above 5k rpm

Note: went to 120 and got much better power, especially above 5k.

Power & Air/Fuel vs rpm (looks weird, though)


Power & Air/Fuel vs MPH
« Last Edit: March 23, 2011, 09:10:50 AM by odiewan »
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Offline Doctor_D

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Re: Post your Dyno Graphs here.
« Reply #12 on: March 19, 2011, 08:05:04 PM »
Newest one is in blue. Same setup, but with a 125-75 cam. Added 2 rwhp and 5(!) lb ft of torque, but peaks moved DOWN the rev range and not up.  Cam must be a bit advanced.

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Take care,
David
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1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline lordmoonpie

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Re: Post your Dyno Graphs here.
« Reply #13 on: March 23, 2011, 04:40:53 AM »
Good work David - what's that peak 81 or higher?
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Offline Doctor_D

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Re: Post your Dyno Graphs here.
« Reply #14 on: March 23, 2011, 09:08:20 AM »
Peak is 80.84 rwhp at 8000 rpm, but then it flattens out for nearly 1500 rpms before falling off.  The combo should keep pulling until 9500 rpms, but it's run out of air.

Basically, it seems that CR29's (with the 125-75 cam, Mike's head-work, and your pipes) are too small.

Anyone out there want to trade my lightly used (under 2 hours run time) CR29's for similarly nice CR31's?
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Take care,
David
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1978 CX500
1971 Norton Commando

Offline lordmoonpie

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Re: Post your Dyno Graphs here.
« Reply #15 on: March 23, 2011, 09:16:13 AM »
Ah so if I ever get mine to a dyno, my old CR31s should be just the ticket!  ;D
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Offline bear

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Re: Post your Dyno Graphs here.
« Reply #16 on: March 23, 2011, 05:28:34 PM »
Quote from: lordmoonpie on March 23, 2011, 09:16:13 AM
Ah so if I ever get mine to a dyno, my old CR31s should be just the ticket!  ;D

We're waiting Simon ;D

Cheers,
Brian
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Offline andy750

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Re: Post your Dyno Graphs here.
« Reply #17 on: April 23, 2011, 12:04:50 PM »
CB750K2
55,000 original miles on the bike

Mike Rieck (JMR) engine:
Bored out to 810cc
Dynoman 295 cam
Ported

Stock carbs
120/40 jets
Stock airbox/OEM air filter
Stock clutch
4-4 HM300s with baffles
Oil - regular 10W40 Penzoil - not changed since rebuild.

Added 2 gallons of Ultra 93 on the way to the dyno which mixed with the regular 87 I normally use.

Dyno was done personally by Rick Stetson at Harrys Machine Shop in Northborough. Rick is a world famous drag racer and has a little plaque as you walk in saying he is a member of the 200 mph club! Another plaque says 222.2 mph!! So he jumped on the K2 and did the dyno - graph shown was when bike was in 4th gear...was fun to watch...and the result is...





Before the second run (blue line) the bike was strapped down at front and back as the rear wheel was slipping - turns out the rear wheel is either not balanced or out of true - its way out apparently! Anyway on the second run the clutch slipped - you can see where....so possibly a few more HP when the wheel is sorted out.

So powerband is between 5000 -7000 rpm which is exactly where i have been feeling it on the highway.

Rick did mention the initial lag on the throttle due to the stock carbs so CV carbs or something else would eliminate this.

Very happy with the numbers! Thank you Mike!!

cheers
Andy
 
« Last Edit: April 23, 2011, 12:07:45 PM by andy750 »
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1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
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Offline brewsky

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Re: Post your Dyno Graphs here.
« Reply #18 on: July 10, 2011, 08:26:02 AM »
78 750 K8, stock motor, 42,000 miles, 2,500' elev, 83 degrees,  stock airbox w/K&N, Mac 4/1 with baffle. Jetted 127.5's and 3 shims under needles (for previously installed PODS)....way rich for this setup!

One pull at 1/2 throttle, one at full throttle.
« Last Edit: May 26, 2012, 12:52:28 PM by brewsky »
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Offline Doctor_D

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Re: Post your Dyno Graphs here.
« Reply #19 on: August 10, 2011, 08:20:55 PM »
RS34's only wanted to run on 3 cylinders, so I swapped my CR31's to rule out carbs before send the Dyna 2000 back for inspection.  Needless to say, it runs on all four, and well at that.



CR31's with 130 mains. Picked up 4hp over the CR29's, peak is now 84.76.  Torque is unchanged at 56 lb/ft.  50 lb/ft on tap from 5400 rpms to 9000 rpms.

Could go to 128's and back to YY8 needles as it's still a bit rich.  It's also only at 30 deg total timing, so I may dial in a bit more this weekend if I get a chance to get into the shop.
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Take care,
David
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Offline MRieck

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Re: Post your Dyno Graphs here.
« Reply #20 on: August 11, 2011, 07:43:05 PM »
Nice. Getting there. I would like to see it hold HP at the end. The 34's are the answer. I'll email you.
  Mike
« Last Edit: August 11, 2011, 07:44:47 PM by MRieck »
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Offline Sam Green Racing

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Re: Post your Dyno Graphs here.
« Reply #21 on: August 12, 2011, 01:24:56 PM »
You're in the right place Danny. ;D

Sam ;)
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Offline voxonda

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Re: Post your Dyno Graphs here.
« Reply #22 on: October 17, 2011, 11:25:41 AM »
Suppose put it here too:


836 high compression
Cr 31's "ticklers
Flowed head with bigger in and outlet valves
Dyno ignition
Webcam 63b
4 open megga's
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Offline Doctor_D

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Re: Post your Dyno Graphs here.
« Reply #23 on: October 19, 2011, 06:35:51 AM »
Quote from: voxonda on October 17, 2011, 11:25:41 AM
Suppose put it here too:


836 high compression
Cr 31's "ticklers
Flowed head with bigger in and outlet valves
Dyno ignition
Webcam 63b
4 open megga's

Congratulations on the nice numbers.  These are pretty much the exact same results that we got with my 836.

Vox      84.8hp 58.7lb/ft
David   84.7hp 56.8lb/ft

This winter I'll fiddle with the RS's again and see if there's another couple more HP to be found, but Voxonda's runs make me think this is close to the limit for this configuration.
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Take care,
David
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1975 CB 750F - Project page: http://forums.sohc4.net/index.php?topic=66026.msg725479#msg725479
1978 CX500
1971 Norton Commando

Offline iomtt9

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Re: Post your Dyno Graphs here.
« Reply #24 on: October 19, 2011, 01:20:43 PM »
Honda Classic Racer, 498cc.
Standard Crank.
Farndon Race Rods.
Original 1978 Yoshimura Isle of Man Cam.
Gas Flowed Head.
Wiseco Pistons.
Standard Inlet & Exhaust Valves.
S & W Valve Springs.
26mm CR Carbs, 110 Jets in 1&4, 105 Jets in 2&3.
4 Open Meggas.
Dyna 2000 S Ignition, 40 Deg.
This was tested on 27-3-10. New engine coming along slowly, will post when up and running.
« Last Edit: October 19, 2011, 01:35:33 PM by iomtt9 »
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