Search found 513 matches

by Jack Gifford
Thu Apr 09, 2020 6:39 am
Forum: Tech
Topic: Converting a B50 to wet sump.
Replies: 30
Views: 381
Flag: United States of America

Re: Converting a B50 to wet sump.

kommando wrote:
Wed Apr 08, 2020 11:38 am
... the big end bearing is a needle roller bearing there is no back pressure...
No pressure? Don't side clearances of the rod's big end determine the pressure?
by Jack Gifford
Tue Apr 07, 2020 6:12 am
Forum: Tech
Topic: Converting a B50 to wet sump.
Replies: 30
Views: 381
Flag: United States of America

Re: Converting a B50 to wet sump.

Momus wrote:
Mon Apr 06, 2020 7:17 pm
... Jack, pretty much most of my reasons...
Go for it! Make the [deeper] sump from light alloy with plenty of fins- which will get more air contact than a tank hidden out of the air stream. Thermally insulating it from the engine cases would be desirable- but challenging.
by Jack Gifford
Mon Apr 06, 2020 5:16 am
Forum: Tech
Topic: Converting a B50 to wet sump.
Replies: 30
Views: 381
Flag: United States of America

Re: Converting a B50 to wet sump.

Having had lots of experience with dry-sump oiling (competition V8 & 4-cyl), I can tell you one reason I would prefer wet-sump, although it would probably be less of a concern for a bike engine. Since a dry-sump system must be designed with the scavenge rate sized greater than the pressure-side rate...
by Jack Gifford
Sun Feb 16, 2020 5:50 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

minetymenace wrote:
Sat Feb 15, 2020 4:37 pm
... Irony is so wasted on our American cousins...
The sarcasm emoticon was so wasted on minety... :roll:
by Jack Gifford
Sat Feb 15, 2020 5:59 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

Minety- are you joking? Or don't you read your own forums? :roll:
by Jack Gifford
Sun Feb 02, 2020 6:09 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

beat wrote:
Sat Feb 01, 2020 8:30 pm
... the barrel has to be cut at the bottom by 1.7mm ...
And... custom shorter pushrods?
... "Bigger ports"... Different head? Or did you "carve out" the ports?
by Jack Gifford
Sat Feb 01, 2020 5:23 am
Forum: Suppliers and New Products
Topic: bend pipes
Replies: 4
Views: 1087
Flag: United States of America

Re: bend pipes

Nice work!
Is the engine's displacement increased in the same proportion as the exhaust ID area? :lol:
by Jack Gifford
Thu Jan 16, 2020 6:25 am
Forum: News
Topic: Exeter Trial 2020
Replies: 7
Views: 811
Flag: United States of America

Re: Exeter Trial 2020

Congratulations!

I had a victor 441 (not the 'Roadster' in my signature) that was way too fast in first gear for trail/woods riding (stock I think?). Do you run slower gearing than stock?
by Jack Gifford
Tue Dec 10, 2019 6:26 am
Forum: Tech
Topic: Lozenge silencer
Replies: 7
Views: 820
Flag: United States of America

Re: Lozenge silencer

In your quite-recent thread about this (Nov 19th?), someone posted a link to "The everlasting lozenge". I found it a very informative- did you read it? It seemed to me that it provided enough info for someone to build their own muffler.
by Jack Gifford
Sat Nov 23, 2019 7:21 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

If the starting rollers had some texture, rather than being smooth...???
by Jack Gifford
Fri Nov 22, 2019 6:43 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

I can already visualize Beat concocting motorized starting rollers... :cool:
by Jack Gifford
Fri Oct 04, 2019 5:23 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 168
Views: 37792
Flag: United States of America

Re: Crankshaft experiment

Thanks Beat! I'll be watching for some podium finishes with your 3-wheeler.
by Jack Gifford
Mon Sep 30, 2019 2:57 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 168
Views: 37792
Flag: United States of America

Re: Crankshaft experiment

Got in two more tenth-mile runs with no damage. Had to abort the first run- about two seconds out the rear tires broke traction and tried to pass me! Gearing was only increased about 12% and I didn't expect wheelspin. On the second run I stayed away from full throttle for a couple of seconds, so I d...
by Jack Gifford
Tue Sep 03, 2019 5:13 am
Forum: Tech
Topic: Lithium-ion battery pack
Replies: 6
Views: 1558
Flag: United States of America

Re: Lithium-ion battery pack

I'm amazed how inexpensive miniature electronics are. A BMS for $5? Wow!
by Jack Gifford
Tue Aug 27, 2019 6:06 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 168
Views: 37792
Flag: United States of America

Re: Crankshaft experiment

The race car treated me good once more- no issues. :thumb 85.3 MPH at the end of the tenth-of-a-mile was 7,100 RPM, which is getting closer to the engine speed I want to see. I need to improve some things in the cramped cockpit. For example, the required helmet and HANS device prevent me from tippin...
by Jack Gifford
Sun Aug 25, 2019 3:39 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 168
Views: 37792
Flag: United States of America

Re: Crankshaft experiment

Tomorrow I'll be at the tenth-mile drag event again... This time with gearing that's more appropriate... :oops:
by Jack Gifford
Wed Aug 07, 2019 3:58 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 168
Views: 37792
Flag: United States of America

Re: Crankshaft experiment

Another test-run with no breakage, this time on a quarter-mile track. Didn't learn much, due to a bad choice of gearing- too "tall" to get the engine into its intended rev range.
by Jack Gifford
Sun Jul 28, 2019 6:37 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

What style oil ring is it? It doesn't look like any style that I'm familiar with.
by Jack Gifford
Fri Jul 26, 2019 6:46 am
Forum: This Forum
Topic: Hello???
Replies: 18
Views: 5271
Flag: United States of America

Re: Hello???

I think we set a new record- 3 full days with no new posts... :(
by Jack Gifford
Tue Jul 16, 2019 6:01 am
Forum: This Forum
Topic: Hello???
Replies: 18
Views: 5271
Flag: United States of America

Re: Hello???

Once more... no new posts in the last 24 hours. Must be great riding weather, eh? :smile: Actually, the weather here would make for good riding- I'm just too busy with the lakester right now. Shooting for doing some testing on the quarter-mile dragstrip at Norwalk Ohio- first August weekend is the A...
by Jack Gifford
Wed Jul 03, 2019 7:32 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 168
Views: 37792
Flag: United States of America

Re: Crankshaft experiment

Well, yes, it's intended to look like part of an airplane. The body is a fiberglas replica of a P-38 drop tank. Starting in 1947 hot rodders used surplus aluminum drop tanks for the original landspeed racing "lakesters".
by Jack Gifford
Mon Jul 01, 2019 4:52 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 168
Views: 37792
Flag: United States of America

Re: Crankshaft experiment

Inaugural outing went amazingly well. No problems, no liquids on trailer deck afterward. The only disappointment was my failure to observe ANY of the gauges, not even the tach, during those quick few seconds. Unfortunately the track's timing system failed to get an ET or MPH number. It definitely wa...
by Jack Gifford
Sun Jun 30, 2019 4:22 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 168
Views: 37792
Flag: United States of America

Re: Crankshaft experiment

I don't expect to actually run 120 MPH in a tenth-mile! Loring would be great, but I can't be ready. Many things are out-of-date (tires, harness, etc.) and I don't yet have a HANS device or latest-Snell helmet, nor a -15 firesuit. I know there are also some rules changes in the last decade- arm rest...
by Jack Gifford
Sat Jun 29, 2019 5:14 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 168
Views: 37792
Flag: United States of America

Re: Crankshaft experiment

Accomplished lakester builders are packaging experts; I'm not. Everything is now jammed into it but the body around the engine will need to grow a good-sized "blister" to cover it all. Nevertheless it's going for a trial run Sunday- a local tenth-mile dragstrip is better than nothing. With 1.5" of g...
by Jack Gifford
Fri May 17, 2019 6:10 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 168
Views: 37792
Flag: United States of America

Re: Crankshaft experiment

Okay beat- I'll depend on you to tell me what's missing! There's a lot to be done, but I've decided how to approach a few things. The longer engine/drivetrain only leaves room for a 4" ctr-to-ctr driveshaft! I'll take the most expedient solution- I'll forego the rear suspension to obviate the need f...
by Jack Gifford
Thu May 16, 2019 5:18 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 168
Views: 37792
Flag: United States of America

Re: Crankshaft experiment

After some more test-runningl last month, it's time to start fitting the engine into the lakester. Proceeding with baby-steps... :roll:
by Jack Gifford
Tue May 14, 2019 5:01 am
Forum: Parts & Bikes wanted
Topic: B44 Rearset footrests wanted - any ideas / inspiration?
Replies: 3
Views: 1087
Flag: United States of America

Re: B44 Rearset footrests wanted - any ideas / inspiration?

I accomplished a small amount of rearsetting (3"-4"?) on a B50T by doing a little machining on the originals and re-attaching them. I don't remember the details, but it wasn't very difficult. I doubt that I took any pictures, but I'll look.

Only found a couple photos, but no details of the pegs.
by Jack Gifford
Wed May 01, 2019 5:58 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

Thanks for posting tbe link to the Hazel Raines story- quite interesting.
by Jack Gifford
Mon Apr 29, 2019 5:11 am
Forum: Tech
Topic: Kick-start aid
Replies: 8
Views: 2244
Flag: United States of America

Kick-start aid

Interesting article in May/Jun edition of Motorcycle Classics about installation of the new KickMagic pneumatic starting assist (made by Classic Bike Experience in Essex VT). If it had been available four years ago I would probably not have parted with the B50T. Anybody here tried the KickMagic?
by Jack Gifford
Mon Apr 29, 2019 4:47 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

... aren't the leading link forks naturally anti-dive?... Only if the brake reaction torque is to the leading link. Side note: old, imprecise, sticky telescopics were also somewhat anti-dive; too bad they didn't have any compliance... I agree that [ideally] beat's torque link should be centered on ...
by Jack Gifford
Sun Apr 28, 2019 6:48 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

Minety must have cheated... :cry:
by Jack Gifford
Fri Apr 26, 2019 6:17 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

337 lb. dry (153.2 kg)
by Jack Gifford
Thu Apr 25, 2019 5:54 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

:ban :ban :ban
by Jack Gifford
Tue Apr 23, 2019 5:55 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

Thanks for the picture. Clever way to obtain anti-dive adjustment!
by Jack Gifford
Sun Apr 21, 2019 6:36 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

Nice work beat!
Any picture of the adjustable-anti-dive scheme?
by Jack Gifford
Thu Apr 18, 2019 6:23 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

Serious question for beat- I'm surprised at the lack of any protection of the transistor's E/C junction from the inductive voltage spike as primary coil current is interrupted. I'm guessing your coil will be low-turns-ratio (thus somewhat-low-inductance primary), but what magnitude will the voltage ...
by Jack Gifford
Wed Apr 17, 2019 6:20 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

minetymenace wrote:
Tue Apr 16, 2019 7:20 am
... Despite granting you guys independence...
Oh?
by Jack Gifford
Wed Apr 17, 2019 6:17 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

Thanks for the details.
by Jack Gifford
Tue Apr 16, 2019 4:55 am
Forum: Off topic
Topic: Star
Replies: 262
Views: 45910
Flag: United States of America

Re: Star

C,B,E == Collector, Base, Emitter (transistor leads) beat- don't you want a resistor (>= 1k ohm) to reduce base current? It looks like you plan to have 12v going through the points and directly to the base of the transistor- which will probably cook the transistor. Or is that space in the box meant ...
by Jack Gifford
Sun Apr 07, 2019 4:27 am
Forum: Tech
Topic: Imperial thread sizes
Replies: 16
Views: 2541
Flag: United States of America

Re: Imperial thread sizes

WM20- Thanks for the BSA history. :thumb