The Spares Company
Club Shop/Regalia
Parent Website
Contact Officials
Machine Registrar
Club Secretary
Membership Secretaries
MPH Editor and Forum Administrator.
Section Newsletters
Technical Databases
Photos
Home
What's new
Latest activity
Forums
New posts
What's new
New posts
Latest activity
Information
Bike Modifications
Machine Data Services
Manufacturers Manuals
Spare Parts Listings
Technical Diagrams
Whitakerpedia (Vincent Wiki)
The Club
MPH Material Archive
Flogger's Corner
Obituaries
VOC Sections
Local Sections
Local Section Newsletters
Miscellaneous
Club Assets
Club History
Club Rules
Machine Data Services
Meeting Documents
Miscellaneous
Essential Reading
Magazine/Newspaper Articles/Letters
Adverts and Sales Brochures
The Mighty Garage Videos
Bikes For Sale (Spares Company)
Log in
Register
What's new
New posts
Menu
Log in
Register
Install the app
Install
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Air Fuel Gauge 02 Sensor Lambda Sensor
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Magnetoman" data-source="post: 110075" data-attributes="member: 2806"><p>Addendum. That video Cyborg links to in post 77 shows the importance of using an air/fuel gauge, although the narrator of the video basically ignored that data and as a result completely missed the point and came to the wrong conclusion. Because of "reversion," with straight pipes on their engine there is a dip in mid-range h.p. accompanied by a too-rich mixture. If they had understood the actual connection between cause and effect they would have realized the problem was with their carburetor, not with reversion due to resonance in the exhaust pipe. Similar to thinking the problem is a fever and trying to cure it with aspirin, missing the fact the actual problem is strep throat.</p><p></p><p>At one point in the video they installed a smaller main jet which caused an increase in AFR at high rpm, but the problem was at lower rpm. Rather than take advantage of the reversion by re-jetting the appropriate circuit in their carburetor that dominates the mixture in that rpm range -- assuming the design of their S&S carburetor actually allows such an adjustment -- to give the correct mixture and benefit from the increase in h.p., they blamed the mid-range problem on the exhaust pipe, rather than their carburetor, and tried to kill the reversion.</p><p></p><p>For our purposes any possible limitations of the design of S&S carburetors aren't important, only whether or not an obstruction in the exhaust pipe interferes with the dynamics of the engine in such a way to affect the AFR. I hope to have the answer to that before much longer, although the current ten-day forecast is for temperatures 102-106 oF that entire period.</p><p></p><p>Addendum: I've now watched that video from the start, rather than the midway point, and it's worse than I thought. At the 5'50" point the narrator says <em>"Tuning a carburetor to fix an exhaust problem is somewhat like putting your arm in a sling to cure a headache."</em> This is <u>totally</u> wrong. Tuning the carburetor is <em>exactly </em>what you need to do to fix an exhaust problem. Further, that resonance isn't even a "problem," it's how additional h.p. can be extracted from the engine. But, only if you realize you have to tune the carburetor. Sigh...</p></blockquote><p></p>
[QUOTE="Magnetoman, post: 110075, member: 2806"] Addendum. That video Cyborg links to in post 77 shows the importance of using an air/fuel gauge, although the narrator of the video basically ignored that data and as a result completely missed the point and came to the wrong conclusion. Because of "reversion," with straight pipes on their engine there is a dip in mid-range h.p. accompanied by a too-rich mixture. If they had understood the actual connection between cause and effect they would have realized the problem was with their carburetor, not with reversion due to resonance in the exhaust pipe. Similar to thinking the problem is a fever and trying to cure it with aspirin, missing the fact the actual problem is strep throat. At one point in the video they installed a smaller main jet which caused an increase in AFR at high rpm, but the problem was at lower rpm. Rather than take advantage of the reversion by re-jetting the appropriate circuit in their carburetor that dominates the mixture in that rpm range -- assuming the design of their S&S carburetor actually allows such an adjustment -- to give the correct mixture and benefit from the increase in h.p., they blamed the mid-range problem on the exhaust pipe, rather than their carburetor, and tried to kill the reversion. For our purposes any possible limitations of the design of S&S carburetors aren't important, only whether or not an obstruction in the exhaust pipe interferes with the dynamics of the engine in such a way to affect the AFR. I hope to have the answer to that before much longer, although the current ten-day forecast is for temperatures 102-106 oF that entire period. Addendum: I've now watched that video from the start, rather than the midway point, and it's worse than I thought. At the 5'50" point the narrator says [I]"Tuning a carburetor to fix an exhaust problem is somewhat like putting your arm in a sling to cure a headache."[/I] This is [U]totally[/U] wrong. Tuning the carburetor is [I]exactly [/I]what you need to do to fix an exhaust problem. Further, that resonance isn't even a "problem," it's how additional h.p. can be extracted from the engine. But, only if you realize you have to tune the carburetor. Sigh... [/QUOTE]
Insert quotes…
Verification
The Series 'A' Rapide was known as the '********' Nightmare?
Post reply
Home
Forums
Forums: Public Access
Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Air Fuel Gauge 02 Sensor Lambda Sensor
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
Accept
Learn more…
Top