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How does factory 2 stage mechanical advance work #2917705 05/02/21 02:25 PM 05/02/21 02:25 PM
Joined: Jan 2003 Posts: 1,619 MA R ragtop OP top fuel
ragtop OP top fuel R Joined: Jan 2003 Posts: 1,619 MA	I know there is a light spring and a heavy spring. But, if both centrifugal weights are connected to a common plate (the rectangle plate with the 2 slots), then how would the light sprung weight be able to advance quickly before the other heavier sprung weight, if they are both connected to that comm plate? Thanks.

Re: How does factory 2 stage mechanical advance work [Re: ragtop] #2917720 05/02/21 03:10 PM 05/02/21 03:10 PM
Joined: May 2019 Posts: 6,213 nowhere S Sniper master
Sniper master S Joined: May 2019 Posts: 6,213 nowhere	Look at the loop on the end of the heavy spring

Re: How does factory 2 stage mechanical advance work [Re: Sniper] #2917751 05/02/21 03:57 PM 05/02/21 03:57 PM
Joined: Jan 2003 Posts: 25,726 Rio Linda, CA John_Kunkel Too Many Posts
John_Kunkel Too Many Posts Joined: Jan 2003 Posts: 25,726 Rio Linda, CA	The INTERNET, the MISinformation superhighway

Re: How does factory 2 stage mechanical advance work [Re: ragtop] #2917877 05/02/21 10:37 PM 05/02/21 10:37 PM
Joined: Jan 2003 Posts: 1,619 MA R ragtop OP top fuel
ragtop OP top fuel R Joined: Jan 2003 Posts: 1,619 MA	Is there a little play in that heavy spring at low RPM? If so how does it stay in place without any tension at low RPM? Thanks.

Re: How does factory 2 stage mechanical advance work [Re: ragtop] #2917915 05/03/21 07:39 AM 05/03/21 07:39 AM
Joined: Jun 2014 Posts: 1,321 VA D dragon slayer pro stock
dragon slayer pro stock D Joined: Jun 2014 Posts: 1,321 VA	Yes. It actually takes a little effort to pry the springs off the weight post which have a mushroom like head. The smaller spring controls advance first until the slack in the heavy spring loop closes on the post at which point both springs contribute to a slower mechanical advance dominated by the heavy spring at higher rpms.

Re: How does factory 2 stage mechanical advance work [Re: dragon slayer] #2917944 05/03/21 10:17 AM 05/03/21 10:17 AM
Joined: Jan 2003 Posts: 1,619 MA R ragtop OP top fuel
ragtop OP top fuel R Joined: Jan 2003 Posts: 1,619 MA	Originally Posted by dragon slayer Yes. It actually takes a little effort to pry the springs off the weight post which have a mushroom like head. The smaller spring controls advance first until the slack in the heavy spring loop closes on the post at which point both springs contribute to a slower mechanical advance dominated by the heavy spring at higher rpms. Thanks. That is a great description.

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