Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 05-12-2016, 02:41 PM   #1
Scotty's 52 F3
Senior Member
 
Scotty's 52 F3's Avatar
 
Join Date: Dec 2015
Location: Marana, AZ.
Posts: 404
Default Accel Dual Point Advance Question

I got a couple old Accel Dual Point distributors for next to nothing so I adapted one to my 52 8RT.

I'm having issues finding the right springs to set up my advance. The springs that were in the Accel to start with are the lightest I have. I'm only running one at the moment and the advance doesn't start to come in until 1100 RPM. Anybody have a recommendation for a source for some lighter springs? The other springs I have are from old advance kits I have and are heavier.

When I set initial timing using a vacuum gauge, max vacuum @ 500 RPM then back off and drop 1", my initial is 6 deg advanced past timing mark. Starts fine.

The max centrifugal advance is 25 deg, all in by 2000 RPM but, doesn't start coming in until 1100 RPM.

I still have to dial in the vacuum advance. Just checking as is gives me 10 deg. 16 deg @ Idle and 36 deg @ 2500 RPM, No load. I can mess with that after I get the springs worked out.

I only hooked up one set of points and gapped @ .014. I can hook up the other set but, my engine is stock. Keeping it simple.

I know I can buy a distributor from Bubba's but, this is part of the fun.

Scott
Attached Images
File Type: jpg P1050497.JPG (201.7 KB, 33 views)
File Type: jpg P1050496.JPG (118.0 KB, 28 views)
File Type: jpg P1050493.jpg (35.7 KB, 34 views)
File Type: jpg P1050494.jpg (36.3 KB, 28 views)
File Type: jpg P1050495.jpg (44.3 KB, 28 views)

Last edited by Scotty's 52 F3; 05-12-2016 at 04:19 PM.
Scotty's 52 F3 is offline   Reply With Quote
Old 05-12-2016, 04:34 PM   #2
BUBBAS IGNITION
Senior Member
 
BUBBAS IGNITION's Avatar
 
Join Date: May 2010
Location: SPEEDWAY INDIANA
Posts: 4,148
Default Re: Accel Dual Point Advance Question

Scott , I love it when a plan comes together.

The accell is a good choice...

Start with a light and a heavy spring. You want the light spring to run the advance curve on the low rpm side...Bend the tang until the heavy spring has slack in it so the light spring can work. The advance shold be limited to approx 22-24 degrees at 2500 rpm.
I would suggest using the dual point configuration as the single set up is somewhat diffucult to set up as one set makes the circuit and the other set breaks the circuit, The make set times the rotor and the brake set controls the actual coil build up etc. Much more functional this way...
Vacuum and mech shouldnt be over 24 degrees engine timing.anymore and you are just removing horse power.
let me know if i can help the project in any way,,,
__________________
If it Makes Spark, we do it !!!!
www.bubbasignition.com
[email protected]
BUBBAS IGNITION is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 05-12-2016, 05:53 PM   #3
Charlie ny
BANNED
 
Join Date: May 2010
Posts: 3,019
Default Re: Accel Dual Point Advance Question

Wow what more can anyone ask.......kudos to you Jim !!
Charlie ny
Charlie ny is offline   Reply With Quote
Old 05-12-2016, 08:55 PM   #4
Scotty's 52 F3
Senior Member
 
Scotty's 52 F3's Avatar
 
Join Date: Dec 2015
Location: Marana, AZ.
Posts: 404
Default Re: Accel Dual Point Advance Question

Thank you Jim. Do you sell the springs I need? The ones I have are too stiff. I only have one spring in and it still doesn't advance until I hit 1100 RPM. It's the lightest spring in the bunch.

Once I find some springs that will allow my advance to come in sooner, I think I can get the rest.

Scott
Scotty's 52 F3 is offline   Reply With Quote
Old 05-12-2016, 09:36 PM   #5
flatjack9
Senior Member
 
flatjack9's Avatar
 
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 4,516
Default Re: Accel Dual Point Advance Question

Quote:
Originally Posted by BUBBAS IGNITION View Post
Scott , I love it when a plan comes together.

The accell is a good choice...

Start with a light and a heavy spring. You want the light spring to run the advance curve on the low rpm side...Bend the tang until the heavy spring has slack in it so the light spring can work. The advance shold be limited to approx 22-24 degrees at 2500 rpm.
I would suggest using the dual point configuration as the single set up is somewhat diffucult to set up as one set makes the circuit and the other set breaks the circuit, The make set times the rotor and the brake set controls the actual coil build up etc. Much more functional this way...
Vacuum and mech shouldnt be over 24 degrees engine timing.anymore and you are just removing horse power.
let me know if i can help the project in any way,,,
I believe you can benefit with more spark advance at part throttle. I think 22 mechanical is a good number to shoot for, but I would add at least 6 deg vacuum advance. If your carb is functioning properly, your part throttle will be on the lean side and you need more spark advance under these condition.
flatjack9 is offline   Reply With Quote
Old 05-12-2016, 11:45 PM   #6
Scotty's 52 F3
Senior Member
 
Scotty's 52 F3's Avatar
 
Join Date: Dec 2015
Location: Marana, AZ.
Posts: 404
Default Re: Accel Dual Point Advance Question

Sponsored Links (Register now to hide all advertisements)
Thanks for the feedback flatjack. I'll put the other set of points in as per Jim and limit the vacuum advance a bit.

The vacuum can on this one does not have the adjustment screw some have. It looks like it is limited by a tube inside the spring. Easy to install a shim or longer tube.

I still need some lighter advance springs if anybody can help me out with some.

Scott
Scotty's 52 F3 is offline   Reply With Quote
Old 05-13-2016, 04:52 AM   #7
JWL
Member Emeritus
 
Join Date: May 2010
Location: Fitzgerald, Georgia
Posts: 2,204
Default Re: Accel Dual Point Advance Question

Referring to a mild engine and street application the mechanical advance should be controlled to about 16 degrees. All this mechanical advance should be "in" by 2000 RPM. Usually about 6 degrees of vacuum advance is the limit. The vacuum advance will serve to improve idle as well as light load cruise efficiency. Static advance of about 4 degrees is a good starting point.

In a couple of examples I have made springs to suit my needs. It is not overly difficult to do. You can too.

Last edited by JWL; 05-13-2016 at 04:53 AM. Reason: Spell check
JWL is offline   Reply With Quote
Old 05-13-2016, 11:28 AM   #8
Scotty's 52 F3
Senior Member
 
Scotty's 52 F3's Avatar
 
Join Date: Dec 2015
Location: Marana, AZ.
Posts: 404
Default Re: Accel Dual Point Advance Question

JWL, Thanks for your input also. (And your book) Guess I'll be making up some springs. Never did it but, I'll figure it out. At least now I have a plan!

Scott
Scotty's 52 F3 is offline   Reply With Quote
Old 05-13-2016, 02:04 PM   #9
BUBBAS IGNITION
Senior Member
 
BUBBAS IGNITION's Avatar
 
Join Date: May 2010
Location: SPEEDWAY INDIANA
Posts: 4,148
Default Re: Accel Dual Point Advance Question

Quote:
Originally Posted by Scotty's 52 F3 View Post
JWL, Thanks for your input also. (And your book) Guess I'll be making up some springs. Never did it but, I'll figure it out. At least now I have a plan!

Scott
Give me a mailing address and i can send ya a few springs.....not a problem....
Just pm it to me....
__________________
If it Makes Spark, we do it !!!!
www.bubbasignition.com
[email protected]
BUBBAS IGNITION is offline   Reply With Quote
Old 05-13-2016, 04:32 PM   #10
Scotty's 52 F3
Senior Member
 
Scotty's 52 F3's Avatar
 
Join Date: Dec 2015
Location: Marana, AZ.
Posts: 404
Default Re: Accel Dual Point Advance Question

Thank you jim!!
Scotty's 52 F3 is offline   Reply With Quote
Old 05-14-2016, 06:58 PM   #11
Scotty's 52 F3
Senior Member
 
Scotty's 52 F3's Avatar
 
Join Date: Dec 2015
Location: Marana, AZ.
Posts: 404
Default Re: Accel Dual Point Advance Question

Just a follow up. I put the 2nd set of points back in as per Jim. Tweeked a single advance spring to get me by until I get some springs from Jim. Starts to advance about 900 RPM now with all in by 2000 RPM.

Set static timing as per JWL to 4 deg. I have 18 deg of mechanical advance and limited my vacuum advance to 6 deg. Starts easy and idles smoooooth. Better throttle response. I thought I had an accelerator pump issue but it no longer stumbles off idle. Drives great and no ping.

THANK YOU everybody! The Accel dual point may not be the most desirable distributor but, it was almost free and a fun project.

Thinking about converting a small block MOPAR electronic one next. Anybody know if a Ford Duraspark is an option?

Scott
Scotty's 52 F3 is offline   Reply With Quote
Old 05-15-2016, 01:07 PM   #12
BillM
Senior Member
 
BillM's Avatar
 
Join Date: May 2010
Location: Everett, WA
Posts: 504
Default Re: Accel Dual Point Advance Question

No experience with the Duraspark but have used the Mopar trigger parts with an HEI module: http://myplace.frontier.com/~wgmumaw...rsionBills.htm
BillM is offline   Reply With Quote
Old 05-15-2016, 03:37 PM   #13
Scotty's 52 F3
Senior Member
 
Scotty's 52 F3's Avatar
 
Join Date: Dec 2015
Location: Marana, AZ.
Posts: 404
Default Re: Accel Dual Point Advance Question

Thank you Bill. I'll take all the info I can get on this.

Scott
Scotty's 52 F3 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 06:51 PM.