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Jeff Earle
Приєднався 9 бер 2014
1965 BSA A65 - Jeff Earle - Bonneville Motorcycle Land Speed Trials 2021
1965 BSA A65 Lightning 650cc. GoPro footage combination, 107.1mph run, air density 5900'.
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Відео
AHRMA Vintage Motocross at Wards Creek 2021 - Matchless vs BSA
Переглядів 1 тис.3 роки тому
1958 Machless G80CS vs BSA B40.
Dyno Day - 1965 BSA A65 LSR
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Dyno Testing Day 06/22/21 at Huff Motorsports, on 1965 BSA A65 Lightning Land Speed Racer. Part of the Vintage Saltworks Racing Team.
BSA A65 Land Speed Run 2019 - Jeff Earle
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AMA Bonneville Land Speed Trials 2019, with Vintage Saltworks Racing. Second run following the "break-in" run, jetted far too rich for the barometric pressure change of the day.
Rejetting for sea level
Переглядів 654 роки тому
1965 BSA A65 Thunderbolt Rocket land speed racer, with Team VSR. No longer really a Thunderbolt. Rejetting for sea level and burning off the USA Fluids oil covering concoction used for salt repellant. Just returned from the AMA Bonneville Motorcycle Land Speed Trials.
Hi Jeff, I've done a bit more testing on this type of head with 34mm PWK carbs and ports, this time a Lightning head. It flows around 50% more air than the stock BSA port and carb. I have a home made flow bench and it may loose accuracy at high flows and air speed, but the std ports without carbs flow 109cfm. With the modified port, that's still quite small, it flows 164cfm through the 40.5mm BSA valve at std lift. Through a 42mm valve it reads 171cfm. It's probably not exact but it gives consistent measurements, and a profound boost in midrange as well as the top end of an otherwise stock A65. I haven't tested one with the 34pwks and stock valves, but it should also be good. 42s give a bit more and restore worn seat height. And they do not sacrifice bottom end, but boost it. I did a similar 34mm Thunderbolt head for a 745cc A65 Period 3 sidecar racer in Queensland, they dominated the Queensland championships last year. And broke the P3 lap record at the circuit by 4.4 seconds. They then fitted a milder SRM race cam and 'it just pulls like a train to redline,' as before, but it now idles. They use a dual throat Weber carb. They have run it now in 10 races. Won 8, with one 2nd because it started jumping out of 3rd, and one dnf with a split carb rubber. It uses an A10 crank, and to conserve it they do not rev it beyond 6,800. Though it should be good to well over 8000 if the crank would last. Their closest competition comes from a very fast 840 Triumph, 920 Norton, and 1200cc Vincent outfits, all using methanol. The little BSA uses petrol. If you are doing more LSRacing with this nice A65, do you want a hand with a cylinder head?
Some good information there, and nice work! Yes my head is already ported with a flow bench involved. I copied a head that was done by Ed Valiket of EV Engineering in Michigan. It's a great design, and the intakes are 32mm now.
Hi Jeff do you use the stock Firebird headers? I use them on mine and they work quite well. Do you still have an H section? How do you get gearing if that's a std 47t on the rear? I have 21-47 but it is very low. The bottom end is stock except for the ported Thunderbolt head with two 34mm carbs. It went to about 7,300 in this but the vibes are pretty bad in the bars. Great having an air fuel gauge on it. ua-cam.com/video/P8YlYA8DulU/v-deo.html
Mark, apologies I didn't realize there was a comment on here. I'm not much of a UA-cam expert, haha. But yes those are the Firebird pipes, and an earlier version without the H crossing. I'm still using the stock rear 47T, but that'll have to change next year. No way around it without totally changing the rear wheel to a new design.
There is an earlier 42t version with the sprocket part of the drum. It needs a different brake back play and some modifications as the bearing is a different size. One of my friends uses one. A different wheel gives more choices though. My brother uses a Yamaha wheel with 20-40t it's 750. I use rgv 250 with 21-36 on an 883.
This is a 79.5x74mm engine with the crank changed to 90 degree. It's in an RGV frame like mine. It uses 20X38t sprockets. ua-cam.com/video/8OOw26Fbe1A/v-deo.html