Register | FAQ | Members List | Calendar | Today's Posts | Search | Contact |
|
Registered
Members: 641 | Total Threads: 50,835 | Total Posts: 518,617 Currently Active Users: 856 (0 active members) Please welcome our newest member, DarnCyclists |
|
|
Thread Tools | Display Modes |
|
12-07-2020, 04:53 PM | #1 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,859
|
Frickin' good article Spuggy!
I did a bunch of searching and I believe this is the video that you referred to? https://youtu.be/TYxtCC330Xg I couldn't get your link to work. I would agree about the alternator taking a lot of power. Many years ago I was fiddling with a Honda or Yamaha and I disconnected the alternator cables whilst it was running. To my amazement the tickover raced up by about 2000rpm and then the alternator dragged it back down to normal when I touched the cables back together. Whatever bike it was would have probably been sub 20bhp but I think the alternator would have been sapping a few of those. This makes a mockery of those who say that it doesn't cost any more to have the lights on, as clearly more current demand puts more load on the engine and therefore burns more fuel... I'm into fitting one of those R/Rs that only draws what it needs.
__________________
|
12-07-2020, 05:36 PM | #2 | ||
Registered User
Join Date: Apr 2016
Location: Farnborough
Bike: M900sie
Posts: 184
|
Thanks Mr Gazza!
Yeh, I spent about 20 hours googling/reading this time around so I didn't embarrass myself on the internet thought I'd take the time to share; I still owe you guys lots, overall Quote:
Quote:
Those of y'all who tried to save battery money on your push bikes by using the dynamo-on-the-tire approach will have a pretty good idea how much drag it takes to generate even a pitiful couple of watts... One of the forum pages, they measured power draw in the alternator leads, to check whether a specific R/R was a shunt or series type; basically, as soon as you switch off the load on a series R/R, the amps in the wires drops off to almost nothing. That's gotta make a difference. All seemed kind of academic until I realized I had to replace the regulator anyway. And wasn't exactly brimming with confidence with the battery. |
||
12-07-2020, 09:13 PM | #3 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,859
|
So will the series R/R meter power demand from the alternator and release more to the engine? Like when I disconnected the cables on my teeny bike? Or does the alternator still sap the engine whatever?
__________________
|
12-07-2020, 09:48 PM | #4 | ||
Registered User
Join Date: Apr 2016
Location: Farnborough
Bike: M900sie
Posts: 184
|
Quote:
An SCR shunt gets damned hot doing this. A MOSFET shunt doesn't get so hot - but is still doing exactly the same 1960's thing, just with updated semiconductors that make it more efficient/turn less power into heat. Any drag on the motor due to the alternator will be identical with both types of shunt; the alternator is running 100% output, 100% of the time. I thought this was a pretty clear, readable explanation, of the difference between shunt/series R/Rs from triumphrat https://www.triumphrat.net/threads/c...upgrade.104504 - they're talking about the SH775 here: Quote:
Last edited by spuggy; 12-07-2020 at 10:16 PM.. Reason: clean up for clarity/brain farts |
||
|
|