My timing table is what is generated by http://www.useasydocs.com/theory/spktable.htm
I do not have access to a load bearing dyno so I will be doing what I can tuning on the road.
What I am seeing from 1000cc 4 cylinder bikes is total timing about 40 degrees. Since I will be boosting up to 10psi, the common suggestion of 1degree/1psi so that would put my total timing around 30deg, however the calculator spits out 18.6. Thoughts?
My table:
My motorcycle specs for table entry:
Table of an R1 (same bore/stroke as my WR250X, similar head design, different cams etc).
Critique my timing table
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Re: Critique my timing table
I'm certainly more in agreement with the MS timing table, a mulitvalve chamber with swirl/tumble (stumble) at that static compression ratio should never need much timing as it is quite a bit more efficient than a two valve pushrod motor. I would start at something in the mid 20's for total timing but I would drop it less than 1 degree per psi boost. Then I would find a constant load dyno.
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I build, repair, install and tune Megasquirt systems in North Dakota and beyond!
I build, repair, install and tune Megasquirt systems in North Dakota and beyond!
Re: Critique my timing table
from looking about my self motorbikes do seem to run a hell of a lot of ignition advance.
1990 bmw 320i daily driver with m20b25 ms3 sequential fuel, 380cc injectors, d585 coil near plug, home made cam sync, launch control, fan control, vss, homebrew egt logging what's next????
Re: Critique my timing table
This is the curve of an '87 FZR1000; 75 x 56mm, 11.2:1 compression. No TPS and no EXUP, and most of the FZRs were considered to be detuned by about 5* vs what you could run on typical (87) pump gas. With a TPS, you should have no issues adding a LOT of advance at part-throttle operation. Obviously, pulling advance as you boost ...
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TTR Ignition Systems
Re: Critique my timing table
I've updated the timing table and here is what I am running now. Bike runs well, unfortunately without access to a load dyno I am left guessing. I also can't detect pinging/knocking....single cylinder motorcycle.