Search found 443 matches

by Jack Gifford
Mon Jul 30, 2018 5:16 am
Forum: Off topic
Topic: Star
Replies: 12
Views: 1664
Flag: United States of America

Re: Star

I would love to try to help you Beat, but the last time I tried to help ship some parts to the UK I made an enemy- because UPS charged an arm and a leg to ship from here (NYS) to a port in Florida. Not only lost a friend, but also lost a few hundred dollars.
by Jack Gifford
Sun Jul 29, 2018 5:04 am
Forum: This Forum
Topic: Hello???
Replies: 13
Views: 1140
Flag: United States of America

Re: Hello???

Hmm,,, I guess all B50 riders must be enjoying their bikes in June/July of each year. No new posts here for the last two days- just like a year ago when I started this thread. :thumb
by Jack Gifford
Fri Jul 20, 2018 6:35 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

... I will have my nose in to the methanol metering... I see that AutoMeter does offer air/fuel-ratio meters that will work with methanol fuel. But before I buy one, I'll follow up on an offer from a fellow racer to borrow his 4-band metering system, which would be great to have for the next dyno s...
by Jack Gifford
Tue May 08, 2018 4:15 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

Air pressure check of coolant jacket shows that integrity of sleeves is fine. What appeared to be damage is actually addition of metal to some places on sleeves' surfaces. I'm guessing the detonation "slammed" the top rings forcefully enough to deposit bits of ring material onto sleeve wal...
by Jack Gifford
Sat Apr 28, 2018 5:56 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

With head now off, damage assessment is a mixed bag. A small torched spot in the chamber of #3 by the exhaust valve appears quite repairable. But #2 & #3 sleeves are damaged. If they were typical cast iron sleeves, I wouldn't be too surprised that they appear to be cracked at the approximate spo...
by Jack Gifford
Fri Apr 27, 2018 7:00 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

Roots blowers are notorious for heating the mixture, well beyond the fundamental Boyle's law contribution. Most is due to fluid friction- mixture moving at high velocity through "leaks" (rotor-to-rotor, and rotor-to-case). Some is due to mechanical friction- Teflon strips under high centri...
by Jack Gifford
Thu Apr 26, 2018 5:24 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

You've stated the usual approach very well. If I had chosen parts of a "normal" nature (say a little Weiand 170 c.i. blower) I'd probably be well on my way to having it sorted out by now. But... this project is mostly about things I wanted to investigate (thread title: Crankshaft experimen...
by Jack Gifford
Wed Apr 25, 2018 5:50 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

... old-school constant-flow mechanical injection. The air/fuel ratio (at least at full-throttle/full-load) is based on the simple premise that the camshaft-driven fuel pump's output will be (roughly) proportional to engine speed , as will air flow... In this earlier post, I tried to describe the p...
by Jack Gifford
Tue Apr 24, 2018 4:24 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

stew- you're absolutely correct, that barrel valves are typically not linear. They are the subject of much development, but only if part-throttle operation is of importance, In may case, only full-throttle and somewhat-of-an-idle are important. Initially (and perhaps always) I'll run pavement LSR (1...
by Jack Gifford
Sat Apr 21, 2018 5:51 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

I have a wide-band A/F ratio meter that has been invaluable on gasoline engines. But the fact that the dyno shop doesn't have A/F ratio measuring capability makes me think that maybe air/methanol ratio in a race engine might not be easy to measure? I don't really know, but I will try to learn more. ...
by Jack Gifford
Fri Apr 20, 2018 5:48 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

stew- yes, in pictures from a year ago, it had the blower overdriven. But then in my ultimate wisdom, I decided to be on the safe side (ha ha) and swapped the pulleys. beat- the fuel system is old-school constant-flow mechanical injection. The air/fuel ratio (at least at full-throttle/full-load) is ...
by Jack Gifford
Thu Apr 19, 2018 5:36 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

Dyno session last week was... very tedious and stressful. I had never dyno'd an engine before (actually I never built a 4-cylinder race engine before); the shop had never run such a small engine; the mounting and driveline hardware that I had prepared beforehand needed rework (they changed to a diff...
by Jack Gifford
Sat Apr 07, 2018 6:18 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

The dyno "chamber" has substantial walls and a separate control room. With my 182 c.i. engine, I guess I'm a "small fish in the sea"- my session keeps getting postponed until they finish with the 3,000 HP turbo-diesel that's presently on their dyno- tractor pulling season will be...
by Jack Gifford
Fri Apr 06, 2018 6:13 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

We colonists hate to waste words...

"April 9th"
vs
"the 9th of April"
by Jack Gifford
Fri Apr 06, 2018 6:07 am
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 61442
Flag: United States of America

Re: Electric Start

Very "neat" looking!
by Jack Gifford
Wed Apr 04, 2018 5:28 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

I had no idea I was posting in a fourm. :werd [Is that spelling of 'weird' your idea of proper English?]
by Jack Gifford
Tue Apr 03, 2018 5:31 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

New date 4/9/18.
by Jack Gifford
Wed Mar 28, 2018 5:37 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
Flag: United States of America

Re: Crankshaft experiment

Dyno shop postponed my session. With any luck, will get me in early next week (April 2nd, 3rd, or 4th).
by Jack Gifford
Wed Mar 07, 2018 8:08 am
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 61442
Flag: United States of America

Re: Electric Start

beat wrote: ... CNC = Compleately Neandertaler Control...
:lol: :lol:
by Jack Gifford
Tue Mar 06, 2018 6:33 am
Forum: Tech
Topic: Electric Start
Replies: 582
Views: 61442
Flag: United States of America

Re: Electric Start

Do I recall that you made the slave housing from a block of aluminum? You're quite an artist with that mill!
by Jack Gifford
Wed Feb 21, 2018 8:44 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 129
Views: 11553
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: 129
Views: 11553
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: 582
Views: 61442
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: 582
Views: 61442
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: 582
Views: 61442
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: 129
Views: 11553
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: 228
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: 727
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: 129
Views: 11553
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: 1408
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: 129
Views: 11553
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: 129
Views: 11553
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: 129
Views: 11553
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: 129
Views: 11553
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: 129
Views: 11553
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: 129
Views: 11553
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: 129
Views: 11553
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: 680
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: 129
Views: 11553
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: 680
Flag: United States of America

Re: Centre stands.

Good work. To lighten- how about drilling/milling a triangle out of each foot?

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