Flywheel Diameter

[Colin Wilks]

Please does anyone know the diameter of the standard flywheel across the starter ring teeth? 

I am trying to improve performance on my sports engine by changing out the jets in the 30VE1 carb and also playing with the timing. I am wanting to work out where I am in degrees BTDC.

Original carb set up was Main - unknown(!) and Compensation 60, so not having a 90 I am trying an 85 main and a newer 60 compensation jet (haven't got a 55). Slow running stays the same at 60.

Original timing was set up as 1.25" BTDC fully advanced and I have subsequently advanced this a further 5°, so am tipping I'm now around 18° BTDC fully advanced, but want to check this.

Many thanks

Colin

[Terrytuned]

Colin each tooth on the ring is spaced at 4.5 degrees.
Terry.

[Colin Wilks]

Colin each tooth on the ring is spaced at 4.5 degrees.
                                                                                    Terry.

Cheers Terry, very handy to know. Foolishly I measured the 1.25" on the flywheel, but didn't record the number of teeth, hence my query re the diameter so I can work backwards.

[Colin Wilks]

Think I've answered my own question.
http://www.austin7.org/Data%20Pages/Tech%20Data/
states that 1 7/8" at flywheel = 20°
From this the flywheel circumference is 33.75" and diameter is 10.74".
My 1.25" BTDC at the flywheel is 13.3°, so 1 inch at the flywheel equals 10.7°.

I really must get out more!

[Zetomagneto]

Colin each tooth on the ring is spaced at 4.5 degrees.
                                                                                    Terry.

Another good reply from Terry