BSA B50 -500 APG Build

[stay`tee]

ya sparkplugs are "johnny on the spot", thay will tell you "everything" thats going on in there,, get a magnefied plug reader,, theres plenty information in cyberspace to help you with what to look for,,

[wobblywalrus]

Tom, in the Triumph world it is not unusual to run a hotter grind intake cam than exhaust.  This is true of the modern ones, too.  A successful tuner told me a good cam setup for an 865cc street motor is the hotter 790cc intake cam with the milder 865cc exhaust knocker.  In the same theme, going to the standard rocker arm on the exhaust might not hurt.  It will give the valve more time on the seat and this might help to keep it cooler.  It has more time to get rid of the heat. 

[Koncretekid]

After the valve job, I've reassembled the motor but replaced the exhaust rocker with the standard one.  I can always change it on the Salt.  I now have less than 30% leak down - - not great, but a heck of a lot better than 70%.  I also tried to get a compression test, and my roller starters will no longer turn the motor over in 1st gear.  By using 2nd gear and strapping the rear wheel down, I was able to get 200 psi.  It probably would have been more if I could have got it turn over more quickly by using 1st gear.

The bikes (roadrace bike as well as the landspeed bike) are in the trailer and we will be leaving N.S. tomorrow morning.  I'll be arriving in Bonneville on the 23rd.

Tom

[Old Scrambler]

Have a safe journey

I'll be arriving on Saturday AM (24th)..................I'll look for you and plan to pit nearby.

The Cub has a few new features.......including a fairing...........so I hope to run in your STRAIGHT track

[Koncretekid]

I just got back to my room after three days at Miller Raceway with the roadrace B50, re-learning the art of roadracing.  I had a good race yesterday dicing with a couple of Triumph 500's with the B50 winning the battle.  Unfortunately, ARMA only allows the B50 to run in Sportsman along with the seriously "built" Honda overhead cam twins - -seems the B50 is too new to allow it to run with the Classic 60's bikes, so I was relagated to 6th in class.  Today I went out for an extra race against the Sportsman 750s, but the Boyer shorted out on the warm-up lap so I was done for the weekend.

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

We then removed the fairings and ran the open bike record (500 APG)
8/27, 7:36, 68.8*, DA 5858, wind 0, down run: 120.255
8/27,8:25, 67.6*, DA 5769, wind 4 mph ESE, return run 124.579
Average speed:122.417
8/27, 13:29, 79.2*, DA 6524, wind 3 mph S, down run 125.233
8/27, return run was approximately 125.6 but lost the ticket
Average speed approximately 125.35

We tried one more run Wednesday morning with a slightly richer jet but only ran 141.423 so we decided to quit while we were ahead.  All in all, we had a great week.

Dennis, AKA Old Scrambler, also set a new record in 250 MPS-PG but I don't know the numbers.
Tom

[JimL]

Really great preparation and results, Tom!  Congratultions on all of it.  I will try to visit you in Colorado, next spring.

JimL

[wobblywalrus]

That is really fast!  Probably the best a B-50 has ever done.

[DND]

Hi Tom

Boy that is great news with your speeds  on the salt , and your road racing too

Plus bringing her home in one piece too

Like they say down below  ' Good On Ya '

G Don

[Peter Jack]

Well done Tom. That's a fine looking pair of bikes! 

Pete

[RidgeRunner]

    Stout numbers from the motor you started with!  Congratulations on what you have accomplished.   

           Ed

[Jon]

Congratulations Tom.

Sounds like you had a fun and successful meet.
No mention of frame cracks or self loosening bolts is good news.
Do you have a "next round" plan for the bikes?

Cheers
jon

[Koncretekid]

Congratulations Tom.

Sounds like you had a fun and successful meet.
No mention of frame cracks or self loosening bolts is good news.
Do you have a "next round" plan for the bikes?

Cheers
jon

No frame cracks, no loose nuts (debatable).  I have several options for the future, but I'll probably use a stock stroke crankshaft for next year to make it a 600.  Problems are lower rpm and trying to find a small enough rear sprocket for the lower RPM.  Just thoughts so far. A few more photos from the salt showing Ed, my pit man, the naked bike, and me on the bike at mile 5 waiting to do a return run.
Tom

[Old Scrambler]

BIG CONGRATS on your record........and your accomplishment with a big single

Maybe the motor would adapt to a super-charger with lower compression?

[saltwheels262]

good for you on that top speed, tom.

Bf

[Freud]

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