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Author Topic: BSA B50 -500 APG Build  (Read 498658 times)

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Offline Koncretekid

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Re: BSA B50 -500 APG Build
« Reply #600 on: September 04, 2013, 10:03:40 AM »
Quote from: Freud on September 03, 2013, 11:37:14 PM
Quote:

But my runs at BUB were amazing!  They are as follows: (500 APS-PG)
8/25, 11:03, 70.1*, DA:5900ft, wind 0, down run: 141.029
8/25, 12:01, 71.2*m DA:5990, wind 3 mph NE, return run: 144.714
Average speed:142.871 mph
8/26, 7:56, 68.8*, DA 5829, wind 6 SE, down run: 144.042
8/26, 9:16, 71.5*, DA 5983, wind 0, return run: 142.616
Average speed:143.239

Why isn't the average 143.329 ?

FREUD
Yes, I like your number better!

I thought I also should mention why my roadrace bike ignition quit at Miller.  Luckily, the problem dawned on me during my drive home.  I thought the Boyer had malfunctioned because in spite of the battery still reading 12.3 volts, the voltage dropped to around 5 volts when I turned on the ignition.  I changed Boyer boxes but it still wouldn't run.  When I got home, I hooked up another battery and the motor started and ran fine.  It seems that one of my battery tenders (Canadian Tire brand) had overcharged the gel battery and damaged something internally.  It would still read full voltage, but would not allow enough current to flow to run the ignition.  New battery; problem solved. I could have been up and running for my next race if I had thought of it.
Tom
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Offline wobblywalrus

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Re: BSA B50 -500 APG Build
« Reply #601 on: September 27, 2013, 01:07:45 AM »
Your records are on the list.  They are pretty solid and might be there for awhile.   
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Offline tauruck

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Re: BSA B50 -500 APG Build
« Reply #602 on: September 27, 2013, 07:17:19 AM »
Lousy one Tom. To figure that one out after the fact hurts. IMO it's human nature to look for the most complicated problem first instead of the simple one. I could give an example of what happened to me and how stupid I was at the time but admin doesn't allow foul language here!. :-D. Backup batteries are a must.
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Offline Koncretekid

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Re: BSA B50 -500 APG Build
« Reply #603 on: September 27, 2013, 09:16:26 PM »
Quote from: wobblywalrus on September 27, 2013, 01:07:45 AM
Your records are on the list.  They are pretty solid and might be there for awhile.   
Thanks, Bo,
We had a great year, as I have said, and we hope for longevity. Frankly, I'm not sure why I went so fast but will be putting the bike on the dyno next weekend, so I hope to find the secret.  In any case, I really can't fathom anything to do next, but bump up to the next class.

Quote from: tauruck on September 27, 2013, 07:17:19 AM
Lousy one Tom. To figure that one out after the fact hurts. IMO it's human nature to look for the most complicated problem first instead of the simple one. I could give an example of what happened to me and how stupid I was at the time but admin doesn't allow foul language here!. :-D. Backup batteries are a must.
Sometimes in the heat of the battle, we don't think straight.  My pit man, Ed, had left earlier in the day, so I was on my own.  At least I thought of the solution on the long drive home and it was correct -- consolation!
Tom
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We get too soon oldt, and too late schmart!
Life's uncertain - eat dessert first!

Offline DND

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Re: BSA B50 -500 APG Build
« Reply #604 on: September 27, 2013, 09:23:18 PM »
Maybe a Backup charger too!!
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Offline wobblywalrus

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Re: BSA B50 -500 APG Build
« Reply #605 on: September 27, 2013, 10:37:02 PM »
One thing left to do is to bump the compression way up, run alcohol, and tune it like a speedway bike.
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Offline DND

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Re: BSA B50 -500 APG Build
« Reply #606 on: September 28, 2013, 12:57:16 AM »
How can you do that as they only go full tilt for 300 feet or so at a time LOL
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Offline Koncretekid

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Re: BSA B50 -500 APG Build
« Reply #607 on: September 28, 2013, 05:01:02 PM »
Quote from: wobblywalrus on September 27, 2013, 10:37:02 PM
One thing left to do is to bump the compression way up, run alcohol, and tune it like a speedway bike.
Bo,
I'm already at 13.25 to 1 CR, squish clearance at .035", piston to valve clearance .050-.060". With the short stroke motor, higher CRs are difficult without welding up the head, machining a smaller combustion chamber (bathtub?), and re-profiling the piston to match.  Of course, there's always nitrous oxide or supercharging....................food for thought!  But B50 motors are getting scarce and they simply aren't making them anymore.  Here's one I found recently - - former boat anchor, I think.
Tom
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We get too soon oldt, and too late schmart!
Life's uncertain - eat dessert first!

Offline wobblywalrus

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Re: BSA B50 -500 APG Build
« Reply #608 on: September 28, 2013, 09:35:31 PM »
I never thought about the distance issue.  You would need to start at Mile 2-3/4 and race somewhere that does not require a return run.

Are you thinking of getting a different engine or modding the one you have to run as a 600 against the 750's?
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Offline Koncretekid

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Re: BSA B50 -500 APG Build
« Reply #609 on: September 28, 2013, 11:08:44 PM »
Luckily, we have a 650 class, Bo!  So, yes, a 600 against the 650s.
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We get too soon oldt, and too late schmart!
Life's uncertain - eat dessert first!

Offline Koncretekid

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Re: BSA B50 -500 APG Build
« Reply #610 on: November 02, 2013, 05:27:02 PM »
I just assembled my 2014 motor and quickly installed it in the bike the day before I had to come back to Nova Scotia.  The new motor will be 598cc.  The cylinder and crankshaft were salvaged from the "rust bucket" motor shown above.
Tom
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We get too soon oldt, and too late schmart!
Life's uncertain - eat dessert first!

Offline Old Scrambler

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Re: BSA B50 -500 APG Build
« Reply #611 on: November 02, 2013, 08:14:23 PM »
Nice Bling 8-) 8-) 8-)

I have a feeling more than a few of the 650-twin teams will be surprised :wink:
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2011 AMA Record - 250cc M-PG TRIUMPH Tiger Cub - 82.5 mph
2013 AMA Record - 250cc MPS-PG TRIUMPH Tiger Cub - 88.7 mph
2018 AMA Record - 750cc M-CG HONDA CB750 sohc - 136.6 mph
2018 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 143.005 mph
2018 AMA Record - 750cc M-CF HONDA CB750 sohc - 139.85 mph
2018 AMA Record - 750cc MPS-CF HONDA CB750 sohc - 144.2025 mph

Chassis Builder / Tuner: Dave Murre

Offline Freud

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Re: BSA B50 -500 APG Build
« Reply #612 on: November 02, 2013, 11:53:49 PM »
...tekid.................those are F A N T A S T I C  pictures.

DEAD NUTS ON.

FREUD
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Offline wobblywalrus

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Re: BSA B50 -500 APG Build
« Reply #613 on: November 03, 2013, 12:54:48 AM »
Those look like 500 cc engine sized flywheels.  This might cure some of the vibe problem.
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Offline tauruck

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Re: BSA B50 -500 APG Build
« Reply #614 on: November 03, 2013, 06:20:38 AM »
That looks nice. Good that you're getting ready ahead of time. :cheers:
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