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Author Topic: Solo to Sidecar by STD  (Read 52814 times)
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Peter Jack
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« Reply #315 on: September 17, 2016, 10:54:28 AM »

BTW............my bowl vent tubes are connected to the air-cleaner box.........

Just a suggestion from the peanut gallery. Would you not be better off having a separate air cleaner for the vent tubes? It wouldn't have to be very large and it would eliminate the possibility of the vents being exposed to a low pressure area which could certainly affect the mixtures during a run. Always nice to eliminate one more variable.  grin grin grin

Pete
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« Reply #316 on: September 17, 2016, 11:22:38 PM »

Its a good suggestion.........but I have a ram-air system and the vents are stubbed into the positive side of the box.............
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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
2016 AMA Record - 750cc M-CG HONDA CB750 sohc - 130.7 mph
2016 AMA Record - 750cc MPS-CG HONDA CB750 sohc - 137.7 mph
Chasis Builder / Tuner: Dave Murre
Bruin
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« Reply #317 on: September 23, 2016, 10:59:43 AM »

In an effort to 'get small' in the wind I took a hard look at the sidecar wheel. It kinda sticks out there because I needed room to kickstart the engine, thus the passenger and all go pushed outboard. But through the judicious use of trap doors I can move the passenger in and bring the wheel to the inside of the frame, narrowing the hack by 8 inches. And it still meets the 32" track requirement.


* Tire Relocation.jpg (289.37 KB, 720x960 - viewed 55 times.)
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
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« Reply #318 on: September 25, 2016, 05:17:39 PM »

I was about to break out the sawsall to relocate the hack tire from the outside of the frame to the inside and thus narrow the profile significantly. Luckily Mom always said, "Measure twice, cut once." It turned out that I had flipped two measurements. Instead of having 2 inches clearance, I have two inches overlap and encroach on the required 32" minimum track width. I can't get there from here with the wheel I have or seriously modifying the frame. So as the Church Lady liked to say, "Never mind."
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
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« Reply #319 on: October 01, 2016, 11:20:02 AM »

I thought I would try to cool the engine a bit. Here is an image that shows the internal plumbing cast into the right engine cover, the flow, and how I would tap into it to plumb the oil cooler. The places marked to tap into the flow actually have marks on the case from the factory showing where to do it. As though it was going to be an option at one time. Research shows that the stock flow to the upper end is pretty healthy. I don't see how changing the flow direction/order to the cylinder head and rocker-cam could be detrimental.


* Oil cooler plan.jpg (141.71 KB, 350x263 - viewed 79 times.)
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
Koncretekid
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« Reply #320 on: October 01, 2016, 09:37:31 PM »

I won't make you go any faster, if that's what you want to know!
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We get too soon oldt, and too late schmart!
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« Reply #321 on: October 01, 2016, 10:55:10 PM »

True, not faster in and of itself. But if I can feel better about controlling heat in this air cooled wet sump engine, I can contemplate running hotter fuels. If nothing else, experience has taught me that a cool running engine is faster than hot scrap metal.
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
Koncretekid
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« Reply #322 on: October 02, 2016, 08:45:16 AM »

Brian,
I believe that your motor was very popular with the Flat Track crowd, and there are still some roadracing with the AHRMA guys, so you might try asking some of them what they recommend. Stan (HPbyStan) on the B50.org site may be able to help with that question.
Tom
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We get too soon oldt, and too late schmart!
Life's uncertain - eat dessert first!
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« Reply #323 on: October 02, 2016, 12:13:31 PM »

Tom, Thanks for the tip and contact. I'm in touch with the XR guys on Thumper Talk and a couple of experienced racers. Believe me, I'm dipping my toe into nitro very slowly.
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
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« Reply #324 on: October 09, 2016, 01:18:49 PM »

Not every day is a racer day. I paused to work on my '66 BSA Lightening. It is a dual carb 650 and runs great. But the twin carbs require some attention. When I first rebuilt it I ran the original style Amals but it turned out they were worn differently and despite same jets and synced throttle pull, one cylinder ran lean and got toasted. I put on new mikunis and they sync up well. But I never ride the old girl enough so they gum up now and then. Once bitten and twice shy about the carbs not flowing equally and being a big fan of KISS I found a single carb BSA Thunderbolt style head in my parts bin. So today I got into the zen of lapping the old valves into the old head till they fit like new. I admit that I enjoy giving old metal a new life. And it cost me nothing.


* Grinding bsa valves.jpg (98.99 KB, 960x720 - viewed 52 times.)
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
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« Reply #325 on: October 09, 2016, 11:40:13 PM »

Brian, that was what I did 40+ years ago.  Ran a T-bolt head most of the time and used the dual carb one for racing.

The dual carb heads work a lot better if the intake manifolds are connected with a 5/16 dia hose so the manifold vacuum can be equalized.  Amal carbs are made new by Burlen Fuel Systems.  New carbs with slides made by Surrey Cycle Supply might be the best setup.  You can have double carb speed and tractable running.

The lightnings and spitfires often came with dual throttle cables.  The best setup is a single throttle cable that splits to duals under the tank.  It is a lot easier to keep slides synchronized with the forked cable setup.

A well sorted Lightning is faster than a Triumph Bonneville of the same era.     
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« Reply #326 on: October 13, 2016, 10:21:48 PM »

Wally, good info on the BSA. Of course it is proving problematic. Nothing just bolts on. I'll let you know how it goes.

Meanwhile back on the racer. I decided to tap into the pump line, detour the oil to the cooler, and return it back into the terminal of the line. All parts serviced should get cooler oil. I plan on using copper lines instead of rubber for a little more cooling.

Now I'm working with my fuel chemist and engineer on how to titrate nitropropane in using baby steps.


* Oil Cooler Beta.jpg (110.67 KB, 960x720 - viewed 63 times.)
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
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« Reply #327 on: October 16, 2016, 11:25:31 AM »

I made a little progress converting the '66 BSA Lightening into a single carb Thunderbolt. The four head-rocker cover studs were too big and in the wrong position by 1/16 of an inch so I couldn't simply use zerts. I threaded an aluminum rod to plug the holes, used the cover as a templet for the new holes, drilled, taped, and put in the right size stubs. The cover now fits and no one is more surprised than I.


* 14708164_10209193601030283_7188309048505483004_n.jpg (106.27 KB, 960x720 - viewed 44 times.)

* 14680642_10209193601430293_7330112485454549045_n.jpg (83.12 KB, 960x761 - viewed 47 times.)

* 14671093_10209193602550321_6136801232187951535_n.jpg (93.59 KB, 960x773 - viewed 44 times.)
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
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« Reply #328 on: November 12, 2016, 11:40:39 AM »

I finished converting the '66 BSA from a dual carb Lightning to a single carb Thunderbolt. It took more tooling around than I wanted but the results are good. I rebuilt an old Amal Concentric so I could ride retro. The jet settings I found on the net seem perfect. It starts easy, runs strong, and the plugs read light tan. Now I can get back to my racer.


* BSA Cafe 1 Carb.jpg (123.32 KB, 960x760 - viewed 56 times.)
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STD; Speed Team Doo
'82 Honda 500 APS-AF
'70 Triumph 250 MPS-PG
'71 Triumph 250 APS-PF
'70 Triumph 250 M-PG
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« Reply #329 on: November 12, 2016, 12:14:12 PM »

Nice Beezer.

Regards, Neil  Tucson, AZ
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Regards, Neil  Tucson, AZ
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