Search found 454 matches

by Jack Gifford
Sat Oct 20, 2018 6:08 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 145
Views: 14021
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Re: Crankshaft experiment

Dyno scheduled for 8AM Friday the 26th.
I'll be using the dyno shop's boost pressure sensor and logging, which I know works okay. So the main thing I'll be logging (and watching) on the laptop will be air/fuel ratios.
by Jack Gifford
Sat Oct 13, 2018 6:58 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 145
Views: 14021
Flag: United States of America

Re: Crankshaft experiment

Yes, vibration and RFI are possibilities. I used twisted pairs for all sensor leads, but who knows what interference from a high tension magneto can do.
by Jack Gifford
Tue Oct 09, 2018 5:03 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 145
Views: 14021
Flag: United States of America

Re: Crankshaft experiment

No secrets. Methanol fuel. Fuel/air ratio, as I understand, should be about 5:1 under full throttle maximum load. With no load other than engine acceleration (as throttle was "hammered") was about in the range of 3:1 to 4.5:1 during the test run. I'm mystified by the lack of logging of man...
by Jack Gifford
Mon Oct 08, 2018 4:55 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 145
Views: 14021
Flag: United States of America

Re: Crankshaft experiment

Test run completed- no glitches! :grin: Great throttle response- quick jabs showed about 6,000 RPM (up to 6,400 per the log). No leaks (fuel/oil/coolant) nor strange noises. Log shows air/fuel ratios about where expected- safely "fat" as planned. All data got logged except boost pressure (...
by Jack Gifford
Sun Oct 07, 2018 5:34 am
Forum: Off topic
Topic: Star
Replies: 42
Views: 2782
Flag: United States of America

Re: Star

A many-person sidecar? :!:
by Jack Gifford
Mon Oct 01, 2018 6:09 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 145
Views: 14021
Flag: United States of America

Re: Crankshaft experiment

Beat- Besides the logging, I do intend to make good use of live displays during test running- air/fuel ratios, EGTs, RPM, time, throttle & fuel valve positions, and boost pressure. I'm getting less uncomfortable with the logger software. Enough to fire up the engine for a test run, as soon as I ...
by Jack Gifford
Sun Sep 30, 2018 5:49 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 145
Views: 14021
Flag: United States of America

Re: Crankshaft experiment

beat wrote: ... just hope the laptop survives...
I was forewarned by the owner of the logger to use a laptop with a solid-state "hard drive", as acoustic vibration from engine exhaust would wreak havoc with a spinning disc drive.
by Jack Gifford
Sun Sep 30, 2018 5:45 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 145
Views: 14021
Flag: United States of America

Re: Crankshaft experiment

I built sensors for throttle position and fuel valve angle; they work fine.
Battling to understand the logger software is going less than fine. An 8 or 9 year old kid would probably do better... :oops:
by Jack Gifford
Sun Aug 26, 2018 6:50 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 145
Views: 14021
Flag: United States of America

Re: Crankshaft experiment

minetymenace wrote:Four white paint marks on the twist grip...
Fine- if I can log ten of them per second... :razz:
by Jack Gifford
Fri Aug 24, 2018 6:18 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 145
Views: 14021
Flag: United States of America

Re: Crankshaft experiment

Thanks for pointing out the usefulness of logging throttle position. I don't have that, so I'll think about how to add such a sensor.
by Jack Gifford
Wed Aug 22, 2018 6:20 am
Forum: Off topic
Topic: Crankshaft experiment
Replies: 145
Views: 14021
Flag: United States of America

Re: Crankshaft experiment

Engine is ready to test-run, just waiting for the borrowed air/fuel-ratio metering system to arrive here. But then I'll need to sweet talk my honey into the loan of her laptop to log the data. :roll:
by Jack Gifford
Mon Jul 30, 2018 5:16 am
Forum: Off topic
Topic: Star
Replies: 42
Views: 2782
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: 1950
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: 145
Views: 14021
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: 145
Views: 14021
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: 145
Views: 14021
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: 145
Views: 14021
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: 145
Views: 14021
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: 145
Views: 14021
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: 145
Views: 14021
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: 145
Views: 14021
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: 145
Views: 14021
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: 145
Views: 14021
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: 145
Views: 14021
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: 145
Views: 14021
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: 67413
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: 145
Views: 14021
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: 145
Views: 14021
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: 145
Views: 14021
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: 67413
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: 67413
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: 145
Views: 14021
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: 145
Views: 14021
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: 67413
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: 67413
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: 67413
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: 145
Views: 14021
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: 277
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: 869
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: 145
Views: 14021
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. :(

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