Author Topic: Just got back from the dyno  (Read 2388 times)

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Offline MRieck

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Just got back from the dyno
« on: September 15, 2018, 10:09:14 am »
104.2HP and 65.1 lbs on non ethanol fuel (not designer race fuel). Will post chart later and hopefully a video clip (my oldest son is here so it should be possible). AF was rich.....we figure another 5 HP in there. Pic and link now thanks to my son.

« Last Edit: September 15, 2018, 04:41:35 pm by MRieck »
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Offline calj737

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Re: Just got back from the dyno
« Reply #1 on: September 15, 2018, 10:12:01 am »
That’s a heck of an outcome for a CB350! You must have bought JWilde’s bike  ;D ;D ;D
'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

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Online gschuld

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Re: Just got back from the dyno
« Reply #2 on: September 15, 2018, 12:47:40 pm »
That’s a nice tease Mike. 

Any chance you’re going to fill us in on the combination you are referring to?

😉

George

Offline MRieck

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Re: Just got back from the dyno
« Reply #3 on: September 15, 2018, 12:51:43 pm »
That’s a nice tease Mike. 

Any chance you’re going to fill us in on the combination you are referring to?

😉

George
This is the $1,000,000.00 CB. Should have the chart up in an hour or 2
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Online bwaller

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Re: Just got back from the dyno
« Reply #4 on: September 15, 2018, 03:26:33 pm »
We'll it might be best to dial that puppy down old fella.  ;D Toss a set of 28mm carbs on there, that'll help!

Must have a set of Massey Harris pistons in there?

OK, OK, that's quite spectacular Mr Rieck.....sir.

Online gschuld

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Re: Just got back from the dyno
« Reply #5 on: September 15, 2018, 04:02:28 pm »
That’s a nice tease Mike. 

Any chance you’re going to fill us in on the combination you are referring to?

😉

George
This is the $1,000,000.00 CB. Should have the chart up in an hour or 2

So what has changed?  I’m assuming one of your beautiful billet cylinders and 72(?)mm pistons?

From a July 2005 post of yours Mike describing the million dollar cb as it was:

915cc kit with heavy porting/modified chambers. Kibblewhite 5mm valve stem conversion kit. M3 cam chain tensioner. Megacycle 125-75 cam. Falicon rods, lightened crank, undercut transmission, late model clutch set up, CR-31 carbs with remote idle adjuster. Dyna 2000 ignition/3 OHM coils, Earls oil cooler, Terry Prendergast's spin on filter adaptor. 78F3 front end modified for spokes and early thinned smaller OD rotors. There is more too. Thanks for asking! :)
« Last Edit: September 15, 2018, 04:05:17 pm by gschuld »

Offline kmb69

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Re: Just got back from the dyno
« Reply #6 on: September 15, 2018, 05:56:48 pm »
104.2HP and 65.1 lbs on non ethanol fuel (not designer race fuel). Will post chart later and hopefully a video clip (my oldest son is here so it should be possible). AF was rich.....we figure another 5 HP in there. Pic and link now thanks to my son.
.....

Pretty damn good Mikey!  ;)

Offline MRieck

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Re: Just got back from the dyno
« Reply #7 on: September 15, 2018, 06:27:27 pm »
104.2HP and 65.1 lbs on non ethanol fuel (not designer race fuel). Will post chart later and hopefully a video clip (my oldest son is here so it should be possible). AF was rich.....we figure another 5 HP in there. Pic and link now thanks to my son.
.....

Pretty damn good Mikey!  ;)
Thanks brother, going back in about 3 weeks to sort it out. I am hoping for 111HP and 68lbs.
Owner of the "Million Dollar CB"

Offline Cb750 Racer

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Re: Just got back from the dyno
« Reply #8 on: September 15, 2018, 06:42:17 pm »
104.2HP and 65.1 lbs on non ethanol fuel (not designer race fuel). Will post chart later and hopefully a video clip (my oldest son is here so it should be possible). AF was rich.....we figure another 5 HP in there. Pic and link now thanks to my son.

Hell yeah Mike, Sounds beautiful
1972 Honda CB750 AAMRR Racer
1972 Suzuki GT750 Project
1975 Honda CB400f
1981 Kawasaki KZ750 LTD
1984 Kawasaki GPZ550 =>610cc
1996 Honda CR500

Offline MRieck

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Re: Just got back from the dyno
« Reply #9 on: September 15, 2018, 07:03:28 pm »
104.2HP and 65.1 lbs on non ethanol fuel (not designer race fuel). Will post chart later and hopefully a video clip (my oldest son is here so it should be possible). AF was rich.....we figure another 5 HP in there. Pic and link now thanks to my son.

Hell yeah Mike, Sounds beautiful
Thanks...can't wait until it hits 110HP
Owner of the "Million Dollar CB"

Offline scottly

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Re: Just got back from the dyno
« Reply #10 on: September 15, 2018, 07:12:55 pm »
I wouldn't be surprised if you had to go two main jet sizes leaner to get the A/F out of the basement; maybe more to get into the 13 range?
Don't fix it if it ain't broke!
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Offline MRieck

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Re: Just got back from the dyno
« Reply #11 on: September 15, 2018, 07:15:00 pm »
I wouldn't be surprised if you had to go two main jet sizes leaner to get the A/F out of the basement; maybe more to get into the 13 range?
EXACTLTY! You are right. That's what's gonna happen. Good call.
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Offline scottly

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Re: Just got back from the dyno
« Reply #12 on: September 15, 2018, 07:18:48 pm »
Apples to oranges, but I ended up going from 125 mains to 105 with Webers. ;)
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Offline MRieck

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Re: Just got back from the dyno
« Reply #13 on: September 15, 2018, 07:44:27 pm »
Apples to oranges, but I ended up going from 125 mains to 105 with Webers. ;)
Right....and not apples to steak.....absolutly correct. I never cared about the #'s (or what people said was right/not right, that'll never work etc).....I just always cared about what worked best. Independent thought.
« Last Edit: September 15, 2018, 08:06:44 pm by MRieck »
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Online gschuld

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Re: Just got back from the dyno
« Reply #14 on: September 15, 2018, 08:12:12 pm »
That engine sound great in the video. 8)

I love the sound of a big bore cb750 engine in full song. :)

Are you still running the cr31 carbs or did you go bigger with the JKR cylinder/pistons upgrade?

George

Offline MRieck

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Re: Just got back from the dyno
« Reply #15 on: September 15, 2018, 08:21:46 pm »
That engine sound great in the video. 8)

I love the sound of a big bore cb750 engine in full song. :)

Are you still running the cr31 carbs or did you go bigger with the JKR cylinder/pistons upgrade?

George
RS-34's with the 77/78 K insulators from Vintage CB750. I will vouch for those parts. Good fit (though it takes time!) and material is great.
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Offline scottly

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Re: Just got back from the dyno
« Reply #16 on: September 15, 2018, 08:27:40 pm »
Measurement trumps wild-ass-guesses every time. ;) I found that each .05 mm shift in jet size was worth approximately a .5 shift in the A/F at the critical RPM range, again with Webers and the same emulsion tubes and air jets. Your mileage may vary. ;D 
Don't fix it if it ain't broke!
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Offline MRieck

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Re: Just got back from the dyno
« Reply #17 on: September 15, 2018, 09:20:23 pm »
Bottom line is the bike is back there in 3 week or so. I'd like to knock on 110 HP or so. That would be a strong street engine.
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Offline scottly

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Re: Just got back from the dyno
« Reply #18 on: September 15, 2018, 09:24:58 pm »
I'd like to knock on 110 HP or so. That would be a strong street engine.
No #$%*! ;D
Don't fix it if it ain't broke!
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Offline seanbarney41

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Re: Just got back from the dyno
« Reply #19 on: September 16, 2018, 12:11:17 am »
Bottom line is the bike is back there in 3 week or so. I'd like to knock on 110 HP or so. That would be a strong street engine.
lol, isn't that like the most power an sohc4 has ever made ever?
If it works good, it looks good...

Offline simon#42

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Re: Just got back from the dyno
« Reply #20 on: September 16, 2018, 03:29:49 am »
that sounds great , remember not to get to obsessed chasing power readings . the dyno is not the real world .i find that you need to be slightly rich on the dyno to get the correct reading on the road or track ....... unless you are chasing power readings , in that case weaken it up and go for it !

Online gschuld

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Re: Just got back from the dyno
« Reply #21 on: September 16, 2018, 04:38:46 am »
Bottom line is the bike is back there in 3 week or so. I'd like to knock on 110 HP or so. That would be a strong street engine.
lol, isn't that like the most power an sohc4 has ever made ever?

Well it’s not fair to compare it to giant cc straight port head super high compression short life expectancy race only N/A engines.

Street and race engines are far from an apples to apples comparison.

But in the world of fully streetable N/A PUMP GAS factory stroke engines that are suitable for a short ride around town or a month long cross country expedition...

I’d say Mike well deserves the prize👍.

George
« Last Edit: September 16, 2018, 09:55:01 am by gschuld »

Offline kmb69

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Re: Just got back from the dyno
« Reply #22 on: September 16, 2018, 08:12:22 am »
PLUS 1 on that George!  ;)
Definitely the strongest streetable motor I've ever known of.  8)

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Re: Just got back from the dyno
« Reply #23 on: September 16, 2018, 08:23:20 am »
Looking great Michael.
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Online bwaller

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Re: Just got back from the dyno
« Reply #24 on: September 16, 2018, 02:35:35 pm »
Actually I'm shocked that my "old fella" comment didn't even get a rise out of you.  ::) Guess if the shoe fits. LOL

I was thinking about that 110 number and what modern bikes fall into that category. There aren't many UJM's these days to compare, and  from the 70's very few 1000's ever saw that kind of kick. Pretty GD impressive for a single cam engine.

Hurry up and finish that secret billet head and make some real power.  ;)

« Last Edit: September 16, 2018, 02:50:15 pm by bwaller »

 

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