Ignition timing with a strobe light

[Stagless Steve]

The ROM states that, when using a strobe light to set the timing, the advance at 3,400 rpm should be 16 to 20 degrees above the static figure of 14. To my simple mind this means that it should be 30 to 34 degrees BTDC at 3,400 rpm. But there are no timing marks at 30 to 34 BTDC. I am I being a bit (or even a lot) dim here?
TIA
Steve

[wilf]

Correct, and is why a "dial back" strobe is so useful.

[trunt]

No, that’s about right, to accurately check that you need to use a strobe with advance, which will move the marks.. so you would set the 34 degrees on the dial of the strobe and check that the mark is at TDC

Terry

[singapore stag]

And............don't forget to set the dial back to 00, then to the setting required thereafter, i.e 12,14 etc, etc. If using a " dial back" / advance strobe.

[Wheelz]

If you don't have a dial back strobe just mark the damper/pulley instead.

[MikeParker]

A real dirty - get a bit of "cornflakes packet" (cfp). Lay that along the existing scale and copy the divisions onto the cfp. Then label the cfp divisions just made for the extended range, including the last shown value on the standard metal scale. Then stick the cfp, suitably curved onto the metal scale aligning the same valued markings. Hey presto, a scale that goes up to 45 degrees, or whatever.

You can use thin ali sheet also, which is what I used.

[singapore stag]

[QUOTE=MikeParker;n841776]A real dirty - get a bit of "cornflakes packet" (cfp). Lay that along the existing scale and copy the divisions onto the cfp. Then label the cfp divisions just made for the extended range, including the last shown value on the standard metal scale. Then stick the cfp, suitably curved onto the metal scale aligning the same valued markings. Hey presto, a scale that goes up to 45 degrees, or whatever.

You can use thin ali sheet also, which is what I used.

Thats very clever! Don't have to get another Timing gun with Dials.

[MikeParker]

[QUOTE=singapore stag;n841782]

A real dirty - get a bit of "cornflakes packet" (cfp). Lay that along the existing scale and copy the divisions onto the cfp. Then label the cfp divisions just made for the extended range, including the last shown value on the standard metal scale. Then stick the cfp, suitably curved onto the metal scale aligning the same valued markings. Hey presto, a scale that goes up to 45 degrees, or whatever.

You can use thin ali sheet also, which is what I used.

Thats very clever! Don't have to get another Timing gun with Dials.

Probably easier with one with dials, but if you get stuck - or are very mean, then improvise is my motto!

[Stagless Steve]

Thanks for the feedback guys. Very useful.