Search found 423 matches

by Jack Gifford
Wed Feb 21, 2018 8:44 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

Awaiting March 28th... so... finding things to do in the shop... In some free stuff was a pair of 1.250" diameter end mills in perfect condition. But they have an outside taper that I don't recognize (2.15 degree/1.075 degree per side). They do have a straight/on-center .355" bore, so I tu...
by Jack Gifford
Fri Feb 16, 2018 7:48 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

Hey- I'm an old-timer, barely getting comfortable taking still shots with a digital camera, let alone trying to take moving pictures... :oops:
Besides- I'll be a bundle of nerves, wondering if the engine will survive.
by Jack Gifford
Sun Feb 04, 2018 6:31 am
Forum: Tech
Topic: Electric Start
Replies: 557
Views: 44917
Flag: United States of America

Re: Electric Start

... I do have some ideas for a solution but at first I will try it the simply way... I'll be interested to see your solutions. I could see two possibilities- 1> Do a little more shaping of the mating sides of the gear teeth- to eliminate the flat triangle at each tooth edge. 2> Shorten the mating e...
by Jack Gifford
Sat Feb 03, 2018 8:35 am
Forum: Tech
Topic: Electric Start
Replies: 557
Views: 44917
Flag: United States of America

Re: Electric Start

Must feel good to see so much of it going together! :grin:
by Jack Gifford
Tue Jan 30, 2018 8:18 am
Forum: Tech
Topic: Electric Start
Replies: 557
Views: 44917
Flag: United States of America

Re: Electric Start

Nice Christmas present!
What alloy?
by Jack Gifford
Mon Jan 22, 2018 6:49 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

Dyno time scheduled- Mar 28th.
by Jack Gifford
Mon Jan 01, 2018 6:39 am
Forum: Off topic
Topic: Happy New Year... goals???
Replies: 1
Views: 86
Flag: United States of America

Happy New Year... goals???

I sure HOPE this is the year my race engine gets dyno'd and finds its way into the lakester.
by Jack Gifford
Sun Dec 24, 2017 7:17 am
Forum: Off topic
Topic: christmas time
Replies: 13
Views: 299
Flag: United States of America

Re: christmas time

Merry Christmas to all B50 forum members!
by Jack Gifford
Sat Dec 02, 2017 6:12 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

" ... not really surprised."- that it worked awhile; or that it self-destructed? :roll:

So now I'm a slave to the weather outside, to continue testing. :(
by Jack Gifford
Sat Dec 02, 2017 6:06 am
Forum: Tech
Topic: Accelerator pump carb
Replies: 27
Views: 740
Flag: United States of America

Re: Accelerator pump carb

The accelerator pump carb on my Ascot 500 thumpers worked great. Just had to watch that nobody played with the throttle when parked.
by Jack Gifford
Thu Nov 30, 2017 7:50 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

Oh well... it worked a couple of times before self-destructing... :oops:
by Jack Gifford
Mon Nov 20, 2017 6:14 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

Doesn't win any award for collector design. :oops:
But hopefully it will allow more test-running in the dry heated garage, while it's wintry outside. The main goal is to get the noxious fumes outside, but perhaps I'll also be able to listen to the engine itself, rather than just the exhaust roar.
by Jack Gifford
Fri Nov 17, 2017 7:09 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

Chances aren't good that the lakester will be ready then, but there's a good chance I'll see you there.
by Jack Gifford
Fri Nov 10, 2017 7:10 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

I've run the engine a few times now- repairs seem to be okay. A little more run-time needed to finish tuning for a reliable idle, before bolting the blower back on. Hope to get it on the engine dyno sometime this winter.
by Jack Gifford
Sat Sep 02, 2017 4:47 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

Sounds like a plan. Keep us posted.
by Jack Gifford
Fri Sep 01, 2017 5:56 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

hwan wrote: ... the AMR500 I've bought, is too big for the 350 its going on...
I don't know that blower. Can't you simply drive it as slowly as needed? I'll be using a billet 14-71 (511 c.i.) on my 182 c.i. four cylinder, drive ratio yet to be determined- but significantly under 1:1.
by Jack Gifford
Thu Aug 31, 2017 6:33 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

Thanks for your interest. I'll attempt to respond to some of your comments. I have to assume that the intake valve was open at that instant, so the site of the explosion was the entire intake tract. A single spring-loaded "pop off" valve was in place, but was too small to alleviate the exp...
by Jack Gifford
Wed Aug 30, 2017 5:15 am
Forum: Project bikes
Topic: Centre stands.
Replies: 3
Views: 305
Flag: United States of America

Re: Centre stands.

I had thought maybe cutting all the way through the legs, leaving enough foot to be sturdy (1/4" or so). This could be milled from the outside- hanging the opposite leg under the table and swiveling the mill's head over to the side (in the manner of the photo).
by Jack Gifford
Tue Aug 29, 2017 6:30 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

... Fascinated by the valve seats coming loose - bad fit, or something to do with the cylinder pressures?... The explosion was very severe- loss of the .006"-,007" press fit of some valve seats is not unexpected, especially in an aluminum head cast about 55 years ago- not nearly the stren...
by Jack Gifford
Sat Aug 26, 2017 5:50 am
Forum: Project bikes
Topic: Centre stands.
Replies: 3
Views: 305
Flag: United States of America

Re: Centre stands.

Good work. To lighten- how about drilling/milling a triangle out of each foot?
by Jack Gifford
Sat Aug 26, 2017 5:47 am
Forum: Tech
Topic: One job tool
Replies: 4
Views: 366
Flag: United States of America

Re: One job tool

Sounds like something I would do. Fortunately I enjoy time spent whittling out parts and tools.
by Jack Gifford
Sun Aug 13, 2017 4:05 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

After 3 months of delay (life gets in the way of racing), I finally got my son to help (mostly observe) as I fired it up today. I'm a little bit surprised how "mean" it sounds unblown- very good throttle response. Only about 30 seconds running, but didn't hear/see anything out of line. I'l...
by Jack Gifford
Sat Jul 01, 2017 6:23 am
Forum: News
Topic: Happy Birthday Minetymenace
Replies: 6
Views: 277
Flag: United States of America

Re: Happy Birthday Minetymenace

Could you have held on for more than 59 seconds? :lol:
by Jack Gifford
Thu Jun 15, 2017 5:54 am
Forum: This Forum
Topic: Hello???
Replies: 10
Views: 600
Flag: United States of America

Re: Hello???

Good for you- very scenic ride! 450 Km- what's the tank size?

[You seem to do just fine without electric starting...]
by Jack Gifford
Sun Jun 11, 2017 4:28 am
Forum: This Forum
Topic: Hello???
Replies: 10
Views: 600
Flag: United States of America

Hello???

Looks like this will be the ONLY post of the day- Saturday 6/10/17!
by Jack Gifford
Sat Jun 03, 2017 4:24 am
Forum: Videos
Topic: 18 bhp
Replies: 12
Views: 698
Flag: United States of America

Re: 18 bhp

Didn't look "easy" to me- more like "masterful" riding.
by Jack Gifford
Wed May 31, 2017 5:24 am
Forum: Videos
Topic: 18 bhp
Replies: 12
Views: 698
Flag: United States of America

Re: 18 bhp

Well-produced video!

I'm impressed- riding through so much mud and barely dirtying the bike. :ban
by Jack Gifford
Wed May 24, 2017 6:21 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

... other countries have a more lackadaisical approach to the planet... It seems you're including USA in that? I don't agree- although use of reclaimed Halon is legal here, it's expensive enough to almost totally discourage it. I'm probably one-in-a-thousand who would spend $100+ for 10 lb. of it. ...
by Jack Gifford
Tue May 23, 2017 6:20 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

Minety- my new extinguisher is filled with 100% "reclaimed" Halon. The U.S. complies with the UN's ban on Halon production . Use of existing Halon stock is not banned. The UN declaration makes an exception to allow Halon production for aircraft systems, since no other agent meets all requi...
by Jack Gifford
Mon May 22, 2017 5:13 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

No, still no measuring of A/F ratio. I only need to be in the ballpark for test running. And so many errors were identified in the prior setup that I'm confident I'll be okay now. Nevertheless, I'll use caution- run it first unblown to allow unhurried observation of all systems. Then eventually add ...
by Jack Gifford
Thu May 18, 2017 5:30 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

Been awhile since my last post. Pretty much found answers for everything. Been busy re-constructing stuff. Still working with the head- more than a couple valve seats lost their press fit, and a number of surfaces "moved around". Shortblock is back together. Blower manifold is re-done, thi...
by Jack Gifford
Thu May 18, 2017 5:19 am
Forum: Off topic
Topic: Centrifugal clutches
Replies: 3
Views: 315
Flag: United States of America

Re: Centrifugal clutches

I can't picture lube doing any "good", as my clutch is wide open to entry of dust and dirt. Seems to me lube would simply retain more abrasive dirt where it's not wanted. I sanded the cast shoe surfaces and machined the drum ID smooth and maybe .020" - .030" oversize (it had very...
by Jack Gifford
Wed May 17, 2017 6:20 am
Forum: Tech
Topic: Electric Start
Replies: 557
Views: 44917
Flag: United States of America

Re: Electric Start

Starter mod looks very neat.

I like how he got the pegs back where they belong. ;-)
by Jack Gifford
Mon May 15, 2017 6:11 am
Forum: Off topic
Topic: Centrifugal clutches
Replies: 3
Views: 315
Flag: United States of America

Centrifugal clutches

I bought a little centrifugal clutch for an offroad kart I built. I was surprised that it is merely steel-on-steel (sheet steel drum, cast-appearing shoes), rather than employing some sort of lining material. It worked okay for awhile but then started dragging at idle. I found both the drum and shoe...
by Jack Gifford
Fri Apr 28, 2017 5:32 am
Forum: Tech
Topic: Special tools?
Replies: 5
Views: 434
Flag: United States of America

Re: Special tools?

Special tools: Working on a B50 I remember having to grind down "thin wall" wrenches (box-end and sockets) to even thinner wall to fit a few nuts and bolt heads.
by Jack Gifford
Tue Apr 25, 2017 6:17 am
Forum: Videos
Topic: Last year, circuit Carole, France.
Replies: 9
Views: 513
Flag: United States of America

Re: Last year, circuit Carole, France.

I notice that the "dirt tracker" is still putting a foot down in the turns! Or- perhaps he's got lead in his boots- to augment shifting his weight inboard? :lol:
by Jack Gifford
Sun Apr 23, 2017 5:29 am
Forum: Videos
Topic: Last year, circuit Carole, France.
Replies: 9
Views: 513
Flag: United States of America

Re: Last year, circuit Carole, France.

Looked like you ran a good race!
by Jack Gifford
Sun Apr 23, 2017 5:25 am
Forum: Int BSA Rally and other meetings
Topic: The all British Rally
Replies: 11
Views: 475
Flag: United States of America

Re: The all British Rally

What's the V-twin in the Enfield?
by Jack Gifford
Sat Apr 01, 2017 5:22 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 90
Views: 6697
Flag: United States of America

Re: Crankshaft experiment

Valve seats are either manganese bronze or silicon bronze- need to look through my notes. Edit: seats are manganese bronze- "Alloy 25" per supplier. Discovered a couple of days ago, a major contribution to the incident. I meant to go larger on hat nozzles than the Hilborn #20's I used in m...

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