Topic: Classic Bonneville Racer

[Bill/BentON Racing]

Congratulations to you and any that helped.  You made us proud!  Really, a great achievement you have accomplished.  Thanks for sharing with us,  Bill

[kmb69]

Way to go, Dennis and crew! We're very proud of you putting one of our favorites on the top of the list!

[Medyo Bastos]

nothing like talking the talk, and walking the walk!


...Save a tree, eat a beaver...

[dragracer]

nothing like talking the talk, and walking the walk!


...Save a tree, eat a beaver...

Here, here!! Nuf said. Lol

[sixthwisconsin]

Dennis,

Amazing feat!
You have concurred the salt.

I have followed all things SALT since I was a kid.
It has this mystical attraction for me. Going all out in a purpose built machine.

The "Spirit of America" did it for me at a very early age.

Enjoy the victory!

[richmagee7]

Hello all, I'm going to jump in on Dennis' thread since Jerry mentioned my bike.  This is my first post since I have never had a question that wasn't answered on this great site.  Anyway, I own the production K5 that Jerry mentioned.  The update is that after running 97mph, with Jerry and Dennis advice I was able to run 98.5 mph which was just a tick over the record of 98.3 by a Norton.  With Dennis advice to wind up the rpms and not shift into fifth I entered the timed section much faster than previous but she kicked out of gear.  For the return run to confirm the record, I managed 102.9mph.  So the record should end up just into triple digits.  Also got to do my first cb750 engine removal and top end tear down in impound.  Anyway, that is the update, another SOHC takes a record.  But mostly, I wanted to say thanks to Dennis and Jerry and their buds for support, encouragement, and helpful advice.  And congrats Dennis.

Rich Magee

[bwaller]

Congrats to you too Rich, these "middle aged" bikes never cease to amaze!

[MCRider]

Congrats to you too Rich, these "middle aged" bikes never cease to amaze!

Yes, great reading. I've been following and silently rooting for everyone involved. Way to go!

[Jerry Rxman Griffin aka MuthaF'er]

Way to go Irishman Rich! LOL Sorry, terrible remembering names. Glad you did it.

How did our 750 Canadian buddy with the Drouin supercharger end up?

[Old Scrambler]

Mark from Blue Earth, Minnesota, ran with and without the supercharger and had very similar speeds at 98 - 101 mph. He told me the SC helped to pull in mid-range only. The bike came to him only a few days before he left for Bonneville with his uncle. Its a stock K2 with F3 and other bits. He cut the frame-rails for tear-down. He plans to improve the bike for next year.



This clean competitor from up-state NY has run before at about 120-mph. I don't know how he did this year but he left early. One cool thing to note is that 3 CB750 bikes were in impound at the same time. There remains a wide variety of records to be attained. 

[Old Scrambler]

My 1st and 2nd runs were good for the 750cc Modified Partial Streamlined Classic Gas record



We changed the counter-shaft and rear sprockets for a faster time but the battery was weak and the return run failed



Then we removed the partial streamliner components and ran consistent 130s to beat the existing 750cc Modified Classic Gasrecord by more than 5-mph

[Old Scrambler]

On the way home we stopped in Davenport, Iowa for the AMCA Chief Blackhawk event. While shopping at the ever-growing number of vendors, I had a nice conversation with David Silver. He strongly recommends buying parts from his US warehouse in Hanover, PA, because he does not want to 'exchange' his inventory back to the UK .... ......BTW......he is buying a few bikes for his museum

Today I hope to finish cleaning the bikes, trailer, and van. Then the bikes get dis-assembled and thoroughly cleaned and lubed to try to prevent rust from any salt residue. Apparently the salt has eaten the wiring harness on the Triumph

Some of this salt will be on the rims of a few Margaritas when we have a team-party upon delivery of the photos and videos taken by 'Wild-Bill' Church and others. I was very gratified to have 7 crew-members during the 1st days of competition


 


 

[Bill/BentON Racing]

Great news, was he running stock  fuel delivery it came with.....they run out of fuel @ 115-120 max was at seal level also! He needs a different set up like a 42mm flat slide like Jim F has on his turbo, Bill Once again so glad you made your goals and set records! K.

[Old Scrambler]

Bill........I don't know what size carb is on the SC..........but thanks for the tip.  I should add to my sprocket changes for the 140-mph that I made the run in 4th-gear. I then used the same ratio to make a 4th-gear down run without the fairing at 130-mph.........and then tried 5th on the return run only to pull the same 130-mph. In affect, I have found the 'wall' of my available power and will have to make other refinements to marginally increase the speed............hmmmm..........a 6-speed tranny and losing 15-20 lbs. may help   My partial streamlining could also be improved.

[Jerry Rxman Griffin aka MuthaF'er]

Great news, was he running stock  fuel delivery it came with.....they run out of fuel @ 115-120 max was at seal level also! He needs a different set up like a 42mm flat slide like Jim F has on his turbo, Bill Once again so glad you made your goals and set records! K.

He had some sort of setup on it hooked into/onto a double outlet petcock. When I first saw it I thought he was going to have a problem but then I saw the double outlet. Don't remember what exactly it was??

[754]

Pingel Guzzler on the red bike..

[Old Scrambler]

Washing..........washing...........power-washing.........the salt is now GONE We closely examined the head and see NO evidence of wear or miss-use. The valves and seats are like-new. The only casualty is the head-gasket. It was well supported on the cylinder side, but lacks full support on the head side. The result was slight bends near the intake valves. We will install a new copper unit and custom fit the openings to match the head. The rockers and cam look like new after 17 pulls on the dyno and 14-miles of 10,000-rpm use. The bores still have 'like-new' hone swirls but the inner edges of the valve pockets on the intake sides of the pistons have tiny crescents indicating the valves have -0- clearance. A light touch with the Dremmel to the pistons is planned before assembly. No evidence of lean or rich conditions. We did not have any oil leaks on the dyno, but the center pucks leaked at Bonneville.

The bike will be ready to show in a few weeks at a half-mile event in Elkhorn, WI.   

[scottly]

Dennis, what were the different sprocket combos you used, and what were the RPMs at max speed with each one?

[Jerry Rxman Griffin aka MuthaF'er]

Glad you found the oil source. Honda pucks? What sealer did you use on them?

[RAFster122s]

Congrats Dennis and Rich and others venturing out on the salt for support or to cheer them on.
Must be a long ordeal to clean the bikes up.  The frame tubes don't have any openings for liquid to enter, right...that could be disasterous.  Cars often rot out the doors when the inside seam is filled with dirt and the drains for water that makes its way in gets that wet.  Then over time and use the interior metal's protection is compromised with bare metal. That dirt retains moisture and if any salt worked its way in then the rust accelerates.  The dirt retaining moisture and heat are ideal conditions to encourage rust.  Cars don't rust in extremely cold weather but that warm garage is not a good place for a salt covered car or bike...just like the bike in a hot trailer would be very bad...so, taking the time to get the salt off quickly is smart.

Hope the trip back is good and good luck at Ekhart Lake.

David

[Old Scrambler]

David...........thanks for the encouragement

Jerry...........3-Bond........but only a mist..............I had suggested more..........only the 2 center units leaked.

Scottly.........We started with 17/45 and ran high 137s.........then tried 18/45 and went 2-mph slower.....all in 5th gear of a K4 tranny.  Then we ran 17/43 in 4th and reached 140. My tach worked to 4,000 and then was not readable. My ears say 10,000-rpms in 4th and a little less when we removed the fairing and went 130.  I may have experienced wheel-slipage by 10% or more so its hard to calculate the speed back to rpms by gear ratios. 

[scottly]

Hey Dennis, I did some research on the 750 tranny ratios, crunched the numbers, and this is what I came up with:
5th gear 18/45= 4.009:1 overall
5th gear 17/45= 4.245:1 overall
4th gear 17/43= 4.739:1 overall
Your bike seems to like an overall lower gear than those you tried in 5th; 17/50 would be the closest equivalent to the 17/43 4th combo @ 4.717:1. The 17/43 4th may be correct for either 140MPH or 130 MPH, but it's unlikely that it's optimum for both speeds; without an accurate tach it's hard to guess what the best gearing is... 

[Old Scrambler]

Thanks, Scottly...............I have a 16t output-sprocket in my box and 46t & 48t rear sprockets on order for my Yamaha rear hub. I am ordering a Scitsu tach with on-board battery and plug-wire indicator for accuracy without bothering the coils or total-loss ignition for reliability. Besides considering a 6-speed tranny, another gearing option is to exchange the K4 5th-gear for an F2 unit............its a little less of an overdrive    

Today we begin to put the motor back together...........

[Old Scrambler]

Here is the link to the tentative 2016 AMA Landspeed records set at the BMST.

http://americanmotorcyclist.com/Home/News-Story/ama-congratulates-racers-who-set-records-at-2016-ama-land-speed-grand-championship

I LIKE  that my naked 750 went faster than the partial-streamlined 1000cc-based on a 750 from Japan ridden by a Mr. Honda

[scottly]

Besides considering a 6-speed tranny, another gearing option is to exchange the K4 5th-gear for an F2 unit............its a little less of an overdrive    

Since you did 140 with only 4 gears, I doubt that a 6th gear would help much. 16/46 with your K4 5th would yield an overall 4.610 ratio, just a bit taller than the 4th gear ratio with 17/43.
PS You really need to take your bike to Ohio!!!