The Marston Sunbeam Club & Register Forum

General Category => Technical Discussion Forum => Topic started by: Exstress on October 17, 2018, 10:06:48 PM

Title: 1935 Model 8. Is timing 9/16" or 7/16"?
Post by: Exstress on October 17, 2018, 10:06:48 PM
Hello,

Just wondered if my timing is correct as 2 reference books are saying 2 different things. 

1935 Model 8. Is timing 9/16" or 7/16" before TDC on full advance setting?


Thank you,  John.
Title: Re: 1935 Model 8. Is timing 9/16" or 7/16"?
Post by: kbryt on October 18, 2018, 06:04:52 PM
7/16  will be fine and not break your ankle like 9/16 would.

Most old road going singles will be quite happy at 1/2 or less, on full advance
Title: Re: 1935 Model 8. Is timing 9/16" or 7/16"?
Post by: Exstress on October 21, 2018, 09:13:34 PM
Ok, 7/16" it is then.

Thank you, John
Title: Re: 1935 Model 8. Is timing 9/16" or 7/16"?
Post by: phutton on November 05, 2018, 06:29:55 PM
The 1933 and 1935 and 1936 handbooks all give 9/16" or 43 degrees BTDC.
Title: Re: 1935 Model 8. Is timing 9/16" or 7/16"?
Post by: Exstress on November 05, 2018, 10:24:58 PM
Thanks Paul.
Title: Re: 1935 Model 8. Is timing 9/16" or 7/16"?
Post by: kbryt on November 07, 2018, 03:18:19 PM
trouble is that advice is now 80+ years old and for entirely different fuels and oil.

If worried, split the difference and go for 1/2" .... 1/16 either way will not wreck your engine, but you will notice sweeter running and easier starting on one.

Which one I'll leave to you. ;)

Another tip I learnt years ago is that every thou difference on the points gap will alter your timing by one degree.