Page 1 of 3
What degrees timing....
Posted: Thu Jan 29, 2009 1:14 am
by drunkmunkey6969
....are you running, on what engine.....and why?
Interested to know what timing people are running, on what engine set ups...and why...(ie - a mate told them to, manufacturers setting, dyno tested, road tested etc etc)........
Re: What degrees timing....
Posted: Thu Jan 29, 2009 8:32 am
by bristolmod
Generally 19 BTDC on all my scoots- simply because I tend to err on the side of caution.
Not totally convinced as to the "official" reasons ( crap modern petrol etc) for doing this.
Bikes idle and run nicely, but I've always got a hankering to advance the timing a tad
Chris
P.S. All are 6v points as well.............
Re: What degrees timing....
Posted: Thu Jan 29, 2009 1:25 pm
by Furious George
I think my TS1 is at 18 degrees maybe even 17 but can't remember exactly
I probably got the setting from reading something in Scootering a while back. It has been set at that for a good few years running unleaded.
FG
Re: What degrees timing....
Posted: Thu Jan 29, 2009 7:29 pm
by leigh
Running RB at 19 degrees, when built kept advancing ignition until the engine pinked. Then backed of a tad. strobed and lines up at 19 degree mark. All test runs where done up a hill to get the engine to labour.
Leigh
Re: What degrees timing....
Posted: Thu Jan 29, 2009 7:56 pm
by J1MS
TS 1 running at 16 degrees, center plug, Compression ratio at 12.2-1
TS 1 running at 19 degrees, Off set squish, Compression ratio at 9.1-1
Rapido 225 Classic at 18 degrees, Off set squish, Compression ratio at 8.9-1
all timings set using dead stop method, for TDC. Compression ratio's (Head volumes) measured using a burette (very accurate).
Re: What degrees timing....
Posted: Thu Jan 29, 2009 9:11 pm
by Robi D
deanspeed 190 with a varitronic, running at 22. i can't remember why! but my thinking is that this is ok because of the varitronic.
Re: What degrees timing....
Posted: Thu Jan 29, 2009 10:05 pm
by drunkmunkey6969
J1MS wrote:
TS 1 running at 16 degrees, center plug, Compression ratio at 12.2-1
TS 1 running at 19 degrees, Off set squish, Compression ratio at 9.1-1
Rapido 225 Classic at 18 degrees, Off set squish, Compression ratio at 8.9-1
all timings set using dead stop method, for TDC. Compression ratio's (Head volumes) measured using a burette (very accurate).
Cool, thanks.
And what prompted those particular choices of timing degrees?
Re: What degrees timing....
Posted: Thu Jan 29, 2009 10:23 pm
by doggbhoy
mugello 225 fast road tune, centre squish head ,matched casings ,varitronic 17 btdc at 6000 rpm
that is what the tuner told me to set it at
Re: What degrees timing....
Posted: Fri Jan 30, 2009 1:18 pm
by coaster
Mugello 186, 1.3 squish, Reaper head, Indian electronic stobed at 18 degrees following advice from (I think?) stickies book.
Re: What degrees timing....
Posted: Sat Jan 31, 2009 12:49 am
by drunkmunkey6969
anyone got any hard n fast theories about timing.....? arriving at choice of degrees? or just push till it pinks?