Author Topic: CB750A Street ET bracket drag bike. A year to build it. (Read 627298 times)

bwaller · « **Reply #2725 on:** June 17, 2012, 03:22:34 PM »

I'm just pluggin along watching, but this sounds like a good move forward guys.

Bill if you have one I'd like to see a side by side pic of the stocker and the modified convertor to try to get my head around why the diff. (You know it's a visual thing)

Jim F · « **Reply #2726 on:** June 17, 2012, 05:14:46 PM »

going to call the shop on Monday and let Robert (who did the work) know where we are with the stall speed.
He knew he could improve it just didn't know how much. Now that we have a base line to work from
there is more he can do for improvement. This was his first converter from a motorcycle and this will tell him
that its not much different from a Chevy 350. This one just spins backwards from the rest.
All in all it was a good day. we are ready to go to the track to see what it does under racing conditions and see if
its contestant. Then if we need to take it off and send it back to the converter shop to get some more stall, we can and work on the line lock
at my shop
November is right around the corner and I don't want to be working on this at the last min but if we didn't it wouldn't be racing

more to come

Jim

dragracer · « **Reply #2727 on:** June 17, 2012, 05:56:46 PM »

700-800 extra useable rpm's is a great improvement. It might get you to that sweet spot on the launch. Any thoughts about going to a bigger rear sprocket now so the motor can pull past the lug spot quicker??

MRieck · « **Reply #2728 on:** June 17, 2012, 06:12:34 PM »

Quote from: Bill/BentON Racing on June 17, 2012, 02:38:37 PM

Frank,we think so.I'll wait a little longer before I decide for sure.the hotter it got the more it seemed to spin up.....90-100 degrees @2800rpm,120-130 degrees ,3100,150-160,3500+?.Gotta go to Commerce.Need to make some runs,get linelock,lots to do,but encouraging and a step in the right direction! Bill

Right.

dragracer · « **Reply #2729 on:** June 17, 2012, 06:14:56 PM »

Getting excited to see what she'll do. I always felt it needed more stall.

MRieck · « **Reply #2730 on:** June 17, 2012, 06:19:02 PM »

Quote from: dragracer on June 17, 2012, 06:14:56 PM

Getting excited to see what she'll do. I always felt it needed more stall.

Right again Frank.

dragracer · « **Reply #2731 on:** June 17, 2012, 06:21:53 PM »

Quote from: MRieck on June 17, 2012, 06:19:02 PM

Quote from: dragracer on June 17, 2012, 06:14:56 PM
Getting excited to see what she'll do. I always felt it needed more stall.
Right again Frank.

Mike, do you know what rpm it crosses the finish line at now??? Is the shift light on?

Thats always my target, to have that light just coming on at the traps

MRieck · « **Reply #2732 on:** June 17, 2012, 06:37:36 PM »

Quote from: dragracer on June 17, 2012, 06:21:53 PM

Quote from: MRieck on June 17, 2012, 06:19:02 PM
Quote from: dragracer on June 17, 2012, 06:14:56 PM
Getting excited to see what she'll do. I always felt it needed more stall.
Right again Frank.

Mike, do you know what rpm it crosses the finish line at now Is the shift light on? Thats always my target, to have that light just coming on at the traps

I do not Frank. that is the telling part and will affect ratios etc. Some testing in order. You are very familiar with the drill....one step at a time. I heard you're good at that Frank.

Bill/BentON Racing · « **Reply #2733 on:** June 17, 2012, 07:53:27 PM »

16/52 now,would like to try 16/54 on it but it crosses line NOW @ 10,000 rpm's...but it's got Carrillo's,gotta try it for 1/8 mile one day for sure.Frank,when's the Red Cross race?

...and the "Big Spread" Eat and Meet ?

Bill
Ya'll been racing any? Update please!

Today was long time coming!!

dragracer · « **Reply #2734 on:** June 17, 2012, 09:14:14 PM »

Quote from: Bill/BentON Racing on June 17, 2012, 07:53:27 PM

16/52 now,would like to try 16/54 on it but it crosses line NOW @ 10,000 rpm's...but it's got Carrillo's,gotta try it for 1/8 mile one day for sure.Frank,when's the Red Cross race? ...and the "Big Spread" Eat and Meet ? Bill
Ya'll been racing any? Update please! Today was long time coming!!

Bill, what did the dyno say about peak horsepower/ rpm with the current top end?? I would shoot for crossing the traps at that peak so try to make your gear choices reflect that point.

I shift my F model at 10,000. I only have HD (CR) steel rods, not the good stuff like Sam auto so i have to limit my max revs.

I think Debbie Knebel posted a target date for the Red Cross race on facebook not long ago. I will have to message her for an update.

Orangeburg doesn't have a race on Labor Day weekend which is when we did the last Pig Pickin that you attended. I'll be looking for another race on that weekend and let you know.

Went up to ZMAX(4 wide) Dragway a few weekends ago for an NHRA bracket race. I raced, the wife was the pit crew. I sucked, crappy reaction time against a street bike. My .050 light to his .007. Lost on a dang hole shot. Next time, Gladys races and i'll be the pit crew-lol. Killed two birds with one stone though. I made my crossover license runs from IHRA to NHRA, just need to send the paperwork in now and i'll be legal to race at Commerce.

Sam Green Racing · « **Reply #2735 on:** June 18, 2012, 06:30:49 AM »

Frank, peak power is at 9000rpm with usable power up to about 9,800 or so, if anything it needs gearing up a tad on the front sprocket, maybe 17 teeth. I have seen 10500rpm when I cross the line on a few occasions.

Sam.

dragracer · « **Reply #2736 on:** June 18, 2012, 07:32:13 AM »

Quote from: SamCR750A on June 18, 2012, 06:30:49 AM

Frank, peak power is at 9000rpm with usable power up to about 9,800 or so, if anything it needs gearing up a tad on the front sprocket, maybe 17 teeth. I have seen 10500rpm when I cross the line on a few occasions.

Sam.

Thanks for that info Sam. I figured you guys were already on target but just wanted to ask the question anyway. Obviously there has to be a trade off when degreeing the cam on an automatic to either get low end power by advancing the cam so the bike can launch better but it does come at a sacrifice for peak top end power.

Bill/BentON Racing · « **Reply #2737 on:** June 18, 2012, 06:34:59 PM »

...Don't forget 60 ft.!

::)Bill....17 up front maybe too much...rather play with her rear!!!

POPS 911 · « **Reply #2738 on:** June 19, 2012, 04:01:57 AM »

DRAGRACER: Who made the slider for your HONDA 750 ? Starting in 1999 Tony Lang of MTC made all of our BUSA and the FIRST GSXR 1000 Suzuki slider for the MSP shop in Ohio. I never saw a 750 Honda with a slider on a drag bike, most folks like a lock up better so they can ride back from the end of the track as with a slider you better push up and back or those clutches last one or two rounds............. take out and clean = restack = same as a PRO-STOCK bike every round.

POPS BK911 " BREAK OUT KING 2012 " Treed them all / broke out by a little = will not look back at 76mph and them coming at 142mph.

dragracer · « **Reply #2739 on:** June 19, 2012, 04:05:58 AM »

Quote from: POPS 911 on June 19, 2012, 04:01:57 AM

DRAGRACER: Who made the slider for your HONDA 750 ? Starting in 1999 Tony Lang of MTC made all of our BUSA and the FIRST GSXR 1000 Suzuki slider for the MSP shop in Ohio. I never saw a 750 Honda with a slider on a drag bike, most folks like a lock up better so they can ride back from the end of the track as with a slider you better push up and back or those clutches last one or two rounds............. take out and clean = restack = same as a PRO-STOCK bike every round.

POPS BK911 " BREAK OUT KING 2012 " Treed them all / broke out by a little = will not look back at 76mph and them coming at 142mph.

No slider in any of my Honda's POPS. I have them in my Kaws. About to put one in the Zuk i'm building. All MTC. Hand clutch in the Honda cause, yes, i do ride it to the line and back to the pits.

Jim F · « **Reply #2740 on:** June 19, 2012, 08:59:38 AM »

Finally got around to talking to my converter guy today and hes happy with the first step
He also agreed that we need to test it out on the 1/4 mile to see if its consistent under racing conditions
Then we can send it back and he said there are a couple of other things to improve on or modify even more but
he just wasn't sure how much the first time out. He has a base line to work from and the first step was a good improvement
(700) RPMS
Next step is the track in a couple of weeks and then back to the shop for another small step in the right direction

Jim

dragracer · « **Reply #2741 on:** June 19, 2012, 10:17:04 AM »

Quote from: Jim F on June 19, 2012, 08:59:38 AM

Finally got around to talking to my converter guy today and hes happy with the first step
He also agreed that we need to test it out on the 1/4 mile to see if its consistent under racing conditions
Then we can send it back and he said there are a couple of other things to improve on or modify even more but
he just wasn't sure how much the first time out. He has a base line to work from and the first step was a good improvement
(700) RPMS
Next step is the track in a couple of weeks and then back to the shop for another small step in the right direction

Jim

Certainly was a great improvement. Glad to hear he feels he can possibly tweak it even more.

Nice work in finding someone to work with you guys. I will see if i c an use him on my VW converter as well. I could surely use another 700 rpm myself.

Leino · « **Reply #2742 on:** June 19, 2012, 11:37:02 AM »

Nine days and Sam arrives here, unfortunately I was unable to finish the Kawasaki and fortunately my boss came to rescue and offered Sam to race his very consistent low 11's running Harley Nightrod.

Sam Green Racing · « **Reply #2743 on:** June 19, 2012, 12:18:50 PM »

Please don't hold it against me guys

The bike.

http://kuvia.1g.fi/kuvat/Tapahtumat+2007/FHRA/NitroNationals5-8.7_07/BikeRace/5-8.7_07-225.jpg

Sam.

Leino · « **Reply #2744 on:** June 19, 2012, 12:32:49 PM »

That bike is for sale, 19300€

Sam Green Racing · « **Reply #2745 on:** June 19, 2012, 01:04:44 PM »

Quote from: Leino on June 19, 2012, 12:32:49 PM

That bike is for sale, 19300€

I think that's about £650 at the moment.

Sam.

Leino · « **Reply #2746 on:** June 19, 2012, 01:09:05 PM »

Quote from: SamCR750A on June 19, 2012, 01:04:44 PM

Quote from: Leino on June 19, 2012, 12:32:49 PM
That bike is for sale, 19300€

I think that's about £650 at the moment.

Sam.

Sounds about right

dragracer · « **Reply #2747 on:** June 20, 2012, 01:47:37 AM »

Bill/Jim,
Monday
Debbie Knebel

Tentatively it is planned for Fri. Sept. 28 - if you know of any conflicts, please let me know ASAP!!! Thanks!

.
Red Cross race info per Debbie Knebel herself.Mark your calenders fellas.

Jim F · « **Reply #2748 on:** June 20, 2012, 06:02:00 AM »

is that up in greer (?) SC

dragracer · « **Reply #2749 on:** June 20, 2012, 07:53:29 AM »

Quote from: Jim F on June 20, 2012, 06:02:00 AM

is that up in greer (?) SC

Yes, thats the race. Bill asked me about dates in an earlier post.

News:

Author Topic: CB750A Street ET bracket drag bike. A year to build it. (Read 627298 times)