26 coupe spark advance

Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration
Model T Ford Forum: Forum 2015: 26 coupe spark advance
Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Benedict on Saturday, January 17, 2015 - 08:28 am:

since my advance/retard lever is set at top dead center (TDC) with the lever at top most position, is it right to assume the model T never should fire after top dead center(ATDC)? The total range of the retard lever is always Before top dead center (BTDC)???? I do run a distributor. Bob


Top of pagePrevious messageNext messageBottom of page Link to this message  By Mark Strange - Hillsboro, MO on Saturday, January 17, 2015 - 09:16 am:

Usually the timing is set so that fully up on the steering column lever corresponds to slightly after TDC on #1 cylinder (like about 15 degrees ATDC). This helps prevent kick-back on starting.

When set in this manner, the timing will pass through TDC as the timing lever is pulled down a few notches, then the remaining lever travel will progressively advance the timing more and more before TDC. :-)


Top of pagePrevious messageNext messageBottom of page Link to this message  By Norman T. Kling on Saturday, January 17, 2015 - 11:42 am:

Whether you use a distributor or coils, the spark should come after top dead center with the lever all the way up. That will prevent kick back when starting. The kick could break an arm if you crank start the car, or it could break the starter if you use a starter.
Norm


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Benedict on Saturday, January 17, 2015 - 12:17 pm:

I think the word advance confused me. It seems strange to say we are advancing the spark when we are moving away from TDC on the up stroke. Thanks for the help guys. Great forum. Bob


Top of pagePrevious messageNext messageBottom of page Link to this message  By Norman T. Kling on Saturday, January 17, 2015 - 12:33 pm:

Think of the top position of the spark lever as "retarded" Then the down position will be "advanced". As the engine speeds up, it needs to be advanced more, because it takes a few split seconds for the fuel to ignite. When it is not moving or moving very slowly while cranking, you want the power to come on the downstroke of the piston. If it comes before the piston reaches top, it will start to run backwards (kick). As soon as it starts, the momentum of the engine will carry it over top before the full power is supplied so it can be advanced. So retarded is a spark coming later and advanced the spark comes sooner.
Norm


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Benedict on Saturday, January 17, 2015 - 06:45 pm:

Thanks again Norm. Have you ever considered teaching old people as a profession? Have a great day, Bob


Top of pagePrevious messageNext messageBottom of page Link to this message  By Norman T. Kling on Saturday, January 17, 2015 - 06:47 pm:

I don't know how old you are Bob, but I am pretty old myself! I have been working with old Fords for over 60 years.
Norm


Posting is currently disabled in this topic. Contact your discussion moderator for more information.
Topics Last Day Last Week Tree View    Getting Started Formatting Troubleshooting Program Credits    New Messages Keyword Search Contact Moderators Edit Profile Administration