Author Topic: Post your Dyno Graphs here. (Read 65667 times)

Doctor_D · « **Reply #50 on:** May 26, 2012, 08:44:29 pm »

Not bad for a stocker.

If you nip a few thou off the bottom of the slides, you won't go so lean on tip-in. (Cycle x provides that service if you don't feel you have the skills.) The rest of the fuel curve is within spitting-distance of perfect.

brewsky · « **Reply #51 on:** May 27, 2012, 04:28:44 am »

Thanks for the comments, David.

I'm hoping the lean bumps are result of the operator trying to get too quick a fist full of throttle at lower rpm (twice), and maybe the accelerator pump circuit is not up to par?

Hate to make an irreversible change to the slide as I'm still planning on exhaust changes.

Will try to attach cell phone videos (quick time zip) of the runs if I can figure out how.................well, it won't work........will try something else later

Jerry Rxman Griffin aka MuthaF'er · « **Reply #52 on:** May 27, 2012, 04:57:16 pm »

Bill,

A little rich in the midrange? You're almost there!

Doctor_D · « **Reply #53 on:** June 09, 2012, 11:28:38 am »

From the fuel/air reading you can see that I need to adjust the accelerator pump to come on a bit earlier and quit a bit earlier - but after doing that I'm calling this one done.

In any case, 88rwhp and 58lb/ft of torque on a 420lb bike is plenty and only 2 short of my goal. Power goes "flat" at the top - just like Tige's 915. Unlike Tige's, my intake and exhaust are open. Might be approaching the limits of the cam.

I'm done chasing this Twinkie.

bwaller · « **Reply #54 on:** June 09, 2012, 12:10:10 pm »

I'm done chasing this Twinkie.

At 420 and that engine... damn straight, that's a nice package. Congratulations.

JohnN · « **Reply #55 on:** June 10, 2012, 08:56:23 am »

761cc
CR31's
Ported w/ 5mm stem kit
CX7 cam 2 degrees advanced (.380/265 @ .040" lift)

Bill/BentON Racing · « **Reply #56 on:** June 10, 2012, 02:54:33 pm »

Quote from: bwaller on June 09, 2012, 12:10:10 pm

I'm done chasing this Twinkie.

At 420 and that engine... damn straight, that's a nice package. Congratulations.

Got me by 30lbs! Also 23 H/P,wow,can't wait til 915cc CycleX and Mikes Stage III head go on! Way to go Dr.D. Great work! Fun fo sure! Bill

MRieck · « **Reply #57 on:** June 10, 2012, 03:53:05 pm »

Quote from: Doctor_D on June 09, 2012, 11:28:38 am

From the fuel/air reading you can see that I need to adjust the accelerator pump to come on a bit earlier and quit a bit earlier - but after doing that I'm calling this one done.

In any case, 88rwhp and 58lb/ft of torque on a 420lb bike is plenty and only 2 short of my goal. Power goes "flat" at the top - just like Tige's 915. Unlike Tige's, my intake and exhaust are open. Might be approaching the limits of the cam.

I'm done chasing this Twinkie.

That pump doesn't need to be on long at all. It will kill power and take 1,500 RPM to clear out. Another millimeter of intake valve ( and corresponding bore of the seat/throat) would make a real be difference Dave in regard to making top end power. Anyway.....88Hp/58lbs (real nice) out of an 836 is pretty damn good Dave.

Doctor_D · « **Reply #58 on:** June 11, 2012, 06:09:50 am »

Quote from: JohnN on June 10, 2012, 08:56:23 am

761cc
CR31's
Ported w/ 5mm stem kit
CX7 cam 2 degrees advanced (.380/265 @ .040" lift)

You can see John's before and after. He had a big hole in his curve from an over-rich needle (YY6, clip position 1) that was compensating for a lean slide (3.0). (Where the blue/green A/F line goes flat, it's richer than 10:1) Trying to hold speed in a tight corner on the track must have been nightmarish.

Lowering the needle should have cleaned up that transition, but got us nowhere. Then we did a 1/2 throttle 3-7k, 3rd gear pull that was off the charts lean, which was the giveaway. Installing a richer 2.5 slide allowed us to raise the needle and decrease the main jet, and the A/F ratio came back on to the readable scale.

Y7 or YY7 needles and we should be able to flatten out that fuel curve.

Sam Green Racing · « **Reply #59 on:** June 11, 2012, 04:08:44 pm »

David, what do you mean it goes flat at the top?

Sam.

Doctor_D · « **Reply #60 on:** June 11, 2012, 05:38:24 pm »

Torque can be flat, but a power curve should be exactly that, a curve. In my limited experience, when HP flattens out for a significant amount of RPM's, there's a restriction in one part of the package.

Sent from my ADR6400L using Tapatalk 2

Leino · « **Reply #61 on:** June 13, 2012, 11:30:32 am »

JMR-Suzuki's first ever dyno graphs, 173 rwhp@ 9600rpm and 137nm @ 7100rpm
Needs some adjustment but I'm pretty happy with the results so far, this particular dyno isn't famous for giving "free horsepower".

azuredesign · « **Reply #62 on:** June 13, 2012, 12:23:46 pm »

Quote from: Leino on June 13, 2012, 11:30:32 am

JMR-Suzuki's first ever dyno graphs, 173 rwhp@ 9600rpm and 137nm @ 7100rpm
Needs some adjustment but I'm pretty happy with the results so far, this particular dyno isn't famous for giving "free horsepower".

Pretty impressive, especially when you think there's more to be had.
Good job!

Leino · « **Reply #63 on:** June 13, 2012, 01:28:47 pm »

Thank you Azure, I'll start with bigger pilot jets and less accelerator pump.
Mike Rieck is responsible for most of the HP, I just put the engine together

Sam Green Racing · « **Reply #64 on:** June 15, 2012, 12:17:58 am »

It's no wonder you can't keep the front wheel down.

Bill/BentON Racing · « **Reply #65 on:** June 15, 2012, 05:58:30 am »

No Sh*t!!!!! Very nice,Juha.....and Mike!!!

Bill

Leino · « **Reply #66 on:** June 15, 2012, 08:15:39 am »

Thanks Sam & Bill, my long term goal is to catch the quickest Busa in my class some day (it runs 9.1's and over 250km/h) but right now I'm 82hp down in comparison

82hp and 25 years

MRieck · « **Reply #67 on:** June 15, 2012, 08:28:30 am »

I do see the classic RS carb power dip around 6,000. I believe its the engine trying to clear itself from the extra fuel added by the accelerator pump. Changing the pump starting point and shortening the pump duration helps get reduce that.

Leino · « **Reply #68 on:** June 15, 2012, 08:33:55 am »

Quote from: MRieck on June 15, 2012, 08:28:30 am

I do see the classic RS carb power dip around 6,000. I believe its the engine trying to clear itself from the extra fuel added by the accelerator pump. Changing the pump starting point and shortening the pump duration helps get reduce that.

This is on my list of things to do before next race

Thanks Mike!

PeWe · « **Reply #69 on:** July 29, 2012, 12:51:42 pm »

Quote from: JohnN on June 10, 2012, 08:56:23 am

761cc
CR31's
Ported w/ 5mm stem kit
CX7 cam 2 degrees advanced (.380/265 @ .040" lift)

"CX7 cam 2 degrees advanced"
Is that recommended to get more torque in lower rpms? Tried to advance the cam more?
I'll install a CX7 cam soon and have in my mind to time it to get more power at lower rpm.

JohnN · « **Reply #70 on:** July 29, 2012, 05:21:58 pm »

Yes, advancing the cam will start the powerband earlier. It was recommended that I advance it 3 degrees, but when I achieved 2 degrees advance during installation I called it close enough!. I can attest the bike launches much better than it did with the stock cam (and tired engine) but still makes good horsepower. Not fair comparing it to a tired engine of course, but now I leave the line at 5000 RPM and before I would rev between 6-7000.
John

PeWe · « **Reply #71 on:** July 30, 2012, 10:05:31 am »

Thanks! 3 it will be, hopefully.

836cc, Ported head with larger inlet valves, earlier Action fours SS-1 cam (270 degr, 0.360 lift)

mec · « **Reply #72 on:** September 17, 2012, 12:40:28 pm »

hello,

did a dyno run with my stock cb750K6,
eveything stock including exhaust with baffles, air filter.
Tovami dyno.

>100.000km, new pistons and rings 6000km.

mec

voxonda · « **Reply #73 on:** September 17, 2012, 01:18:38 pm »

Hi mec,

That is one healthy K6 you have there. Almost 60 on the rear wheel is a lot for a standard engine.

Regards, Rob

Doctor_D · « **Reply #74 on:** September 17, 2012, 01:26:49 pm »

That torque "curve" is really amazing.

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Author Topic: Post your Dyno Graphs here. (Read 65667 times)