Author Topic: CB750A Street ET bracket drag bike. A year to build it. (Read 621959 times)

Bill/BentON Racing · « **Reply #1125 on:** April 21, 2011, 08:04:09 PM »

Quote from: bwaller on April 19, 2011, 06:15:34 PM

Bill, I was told a 0.4 needle jet was not available before June & with the situation in Japan that might even be pushed back. I understand there may still be 10 different needles but one leaner that might help is 5DP39. I have an old jet needle chart that's barely legible and it shows the 5DL31 as being a rich one. That was the needle most used on the street I believe.

We got the 5DP39 needles today along with 27.5 and 30 pilots.Thanks Big Jim and Brian @ Livengood Motorsports.Sprocket on @ couple nights ago,got new chain today,Jim again! Gotta install jets and reassemble 29's.Didn't get any stacks,will check tomorrow.
Dyno Sat? We hope so!,Bill

Sam Green Racing · « **Reply #1126 on:** April 22, 2011, 02:35:12 AM »

Billy, what stacks do you need? I thought the 29s had stacks on them.

Happy Easter everyone.

Sam.

Retro Rocket · « **Reply #1127 on:** April 22, 2011, 03:24:18 AM »

Quote from: Tintop on April 17, 2011, 05:22:32 AM

Great update guys, thanks. Can't believe all the issues with the CV's, but some masterful work seems to have sorted those out. Special thanks to JW for the educational post. Starting to get a feel for what it takes to make a great drag motor.

Wow. i have learned more about CV's reading this thread than anywhere else. Great posts and good to hear its all coming together finally.
You have a great crew there Sam....

Tintop · « **Reply #1128 on:** April 22, 2011, 04:30:00 AM »

Those were 750 PD stacks that were on the 29's. Of course I have a nice filter and modern stacks for the PD's.

Sam Green Racing · « **Reply #1129 on:** April 22, 2011, 05:13:48 AM »

Quote from: Retro Rocket on April 22, 2011, 03:24:18 AM

Quote from: Tintop on April 17, 2011, 05:22:32 AM
Great update guys, thanks. Can't believe all the issues with the CV's, but some masterful work seems to have sorted those out. Special thanks to JW for the educational post. Starting to get a feel for what it takes to make a great drag motor.

Wow. i have learned more about CV's reading this thread than anywhere else. Great posts and good to hear its all coming together finally.
You have a great crew there Sam....

Thanks for the kind words Mick, they were all hand picked for their expertese in their own fields.

Sam.

bwaller · « **Reply #1130 on:** April 22, 2011, 05:22:56 AM »

How long a stack are you looking for?

Bill/BentON Racing · « **Reply #1131 on:** April 22, 2011, 05:28:11 AM »

Quote from: MRieck on April 22, 2011, 04:23:37 AM

Quote from: SamCB750A on April 22, 2011, 02:35:12 AM
Billy, what stacks do you need? I thought the 29s had stacks on them.

Happy Easter everyone.

Sam.
It looked like he was using the stock airbox boots

Mike wins the prize! Only thing I had then.Distorted,and blocks airflow some looking down throat.Not what we want,going deeper into bat cave tonight! Theres something somewhere!Those were new,still available from Honda....quit fighting them 40 yr old boots!
More tonight.Bill

Bill/BentON Racing · « **Reply #1132 on:** April 22, 2011, 05:29:29 AM »

Brent,30-70mm.Needles available!

,Bill

bwaller · « **Reply #1133 on:** April 22, 2011, 06:01:02 AM »

Yea I saw you got the needles, good. I hope those help because I think the 0.4 needle jets might be too small for that engine?? Re stacks I have a guy that will make what I want (30mm long & full radius inlet) for these smoothbores and will make that transition at the carb disappear. However the guy is really busy & I'm not sure how long it will take.

Bill/BentON Racing · « **Reply #1134 on:** April 22, 2011, 06:08:51 AM »

K.Thanks,off to work.Bill

Jim F · « **Reply #1135 on:** April 22, 2011, 07:03:56 AM »

Carbs have been jetted with the new air jets
#4 air jet passage was big and went in and welded the inside of the passage
re machined and drilled and reamed. The new jet is in.
will start to polish the bores and slides after I get over the flu. This sucks being sick
and the bad part about owning a business is that I cant call in sick............

off to bed

Jim

Sam Green Racing · « **Reply #1136 on:** April 22, 2011, 08:13:24 AM »

Nice job Jimmy, get well soon.

Sam.

Bill/BentON Racing · « **Reply #1137 on:** April 22, 2011, 05:00:49 PM »

Thanks,what a talent the gentle giant has! Great work Jim!

Get well you just tired of pulling carbs? Ha Ha
Off to install pcs and parts.......and look for some kind of stack.
Dyno time tomorrow!

,Bill

Bill/BentON Racing · « **Reply #1138 on:** April 22, 2011, 07:47:57 PM »

WOW,another case of Boddington's for that man.Sam said fields,me left field!Mike those kind words mean a lot.Yes,this has been challenging @ times.Someone said it read like a Shakesperean play,definitely some characters ;)Orwellian @ times!

Anyway we still going in the 11's.......oh Jon,by the way what is the official record ET and MPH for an Hondamatic 750?......just wondering?

Pics:smoothies going back on!

Installing needles and pilots

The difference

The bat cave comes through again!

Where is Samauto,we're lonely!

Been waiting 32 yrs to use these stacks!!!....old man I am!

Well ,I guess I better go put them on......Sam,can I eat first?

Tomorrow......83RWHP?....OK 85!! Bill

dragracer · « **Reply #1139 on:** April 23, 2011, 12:38:53 AM »

Jon/Bill,

Any clue on how much horsepower the convertor is eating up before it gets to the rear wheel?

??

Bill/BentON Racing · « **Reply #1140 on:** April 23, 2011, 04:20:12 AM »

TOO DAMN MUCH!!!!!!!!!!

off to dyno...today more answers!!

bwaller · « **Reply #1141 on:** April 23, 2011, 04:20:35 AM »

Bat cave delivers again, purpose built I'd say Bill.

jweeks · « **Reply #1142 on:** April 23, 2011, 06:38:29 PM »

Dragracer,
I'd guess 10-12 hp more lost than with the clutch equivalent for this motor. That's not where our problems are. Around 7 horsepower and 15 ft/lbs of torque at 3 grand is why we don't leave the starting line quickly.

Bill,
Don't remember the exact ET, but around high 10.6's are being run in Texas. If I went for the 14:1 compression in my motor, I could be running the same area. Their bike doesn't repeat well. I run less compression to allow me to drive back to the pits and control the oil temperatures better. Give me 2 more gears and I'll blow away that record... (someday

)

JW

dragracer · « **Reply #1143 on:** April 24, 2011, 01:20:03 AM »

Quote from: JWEEKS on April 23, 2011, 06:38:29 PM

Dragracer,
I'd guess 10-12 hp more lost than with the clutch equivalent for this motor. That's not where our problems are. Around 7 horsepower and 15 ft/lbs of torque at 3 grand is why we don't leave the starting line quickly.

Bill,
Don't remember the exact ET, but around high 10.6's are being run in Texas. If I went for the 14:1 compression in my motor, I could be running the same area. Their bike doesn't repeat well. I run less compression to allow me to drive back to the pits and control the oil temperatures better. Give me 2 more gears and I'll blow away that record... (someday )

JW

Jon,

I wasn't thinking about the convertor on this bike bieng a problem at all. I was kind of curious as to the amount of power a similarly built hand clutch motor would make at the rear wheel. I feel a new hand clutch project bike coming on based on the equivalent specs of the Samauto motor

. I've got a K model thats been sitting for years and i'm now in need of a street ET bike- i'm giving my GSXR750 to my neice and need a replacement so the K might just get a makeover.

Bill/BentON Racing · « **Reply #1144 on:** April 24, 2011, 05:35:05 AM »

The short report: Left home @ 8:00 am...Dyno shop @ 9:00......left 11:30pm!!!

DAMN a bad plug wire...when did it start? It showed up on last changes,were we chasing hesitation,stall,or elec.Can't tune til it runs right.Mr Pro Taylor wire ...you owe me!

OK,it had to be on #1!!...chicken or egg? Don't know ,don't care.We will WIN!!!

Long report later! Bill
Did make 80 hp with 40% humidity,last week 10!
So we were making more power @ one time......

Bill/BentON Racing · « **Reply #1145 on:** April 24, 2011, 05:01:27 PM »

Quote from: bwaller on April 23, 2011, 04:20:35 AM

Bat cave delivers again, purpose built I'd say Bill.

Brent,Batcave delivered 5 less HP on top!! Velocity stacks for sale.....put 'em on your friends bike,then outrun him....our OEM air boots work well,but need some real stacks..N/A from Mikuni/Sudco. Did a second gear run to 10,000 rpm,showed 118+ mph.Smoothbores gotta go,need CV 34's back! Bill

jweeks · « **Reply #1146 on:** April 24, 2011, 05:07:59 PM »

Bill,
Did you have the new +2 rear sprocket on? Did mid-range improve with new needles?

JW

Bill/BentON Racing · « **Reply #1147 on:** April 24, 2011, 06:28:45 PM »

Yes on the sprocket,who knows,sometimes it didn't seem to respond to the changes,last week change,get expected result.Came home and am going to investigate.

Yesterday It had me scratching me head! Igntion problems,but when did they start?
Saw 79.98 RWHP w/40% humidity. ::)Bill
It did not seem to like the leaner needles,BUT?
It did not like leaner mains,122.5-125 worked best.
Bet I installed mains 10-12 times,and needles and c/position @ least 6-8 times.

Brian's awesome,above and beyond call of duty.
More next Sat, providing carbs ready:CV's,$$,and kitchen pass!

Want to go to Mirock series May 20-22nd @ the Rock.
And we will!!

,Bill

dragracer · « **Reply #1148 on:** April 24, 2011, 09:58:34 PM »

Keep pushing TEAM SAM GREEN. You will get there!!!!!!!!!!!!!

Sam Green Racing · « **Reply #1149 on:** April 25, 2011, 06:54:41 AM »

Quote from: dragracer on April 24, 2011, 01:20:03 AM

Quote from: JWEEKS on April 23, 2011, 06:38:29 PM
Dragracer,
I'd guess 10-12 hp more lost than with the clutch equivalent for this motor. That's not where our problems are. Around 7 horsepower and 15 ft/lbs of torque at 3 grand is why we don't leave the starting line quickly.

Bill,
Don't remember the exact ET, but around high 10.6's are being run in Texas. If I went for the 14:1 compression in my motor, I could be running the same area. Their bike doesn't repeat well. I run less compression to allow me to drive back to the pits and control the oil temperatures better. Give me 2 more gears and I'll blow away that record... (someday )

JW

Jon,

I wasn't thinking about the convertor on this bike bieng a problem at all. I was kind of curious as to the amount of power a similarly built hand clutch motor would make at the rear wheel. I feel a new hand clutch project bike coming on based on the equivalent specs of the Samauto motor . I've got a K model thats been sitting for years and i'm now in need of a street ET bike- i'm giving my GSXR750 to my neice and need a replacement so the K might just get a makeover.

Frank, the specs in our motor were based on a motor that Mike built for Art (sparty) a few years back.
It wasn't a race motor but it produced 94bhp at the wheel and ran a high 11 off the trailer.
It was much the same as our bike in the weight department but I'm not sure how much Art weighed in at.

Sam.

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Author Topic: CB750A Street ET bracket drag bike. A year to build it. (Read 621959 times)