I am working on recurving my distributor. I am planning on welding up the slots in the governor to have less total mechanical timing. I have used a formula I have found in a thread.

A-slot length
B-pin diameter
C-movement available
D-C/x=degrees of advance x=.0157

With the governor out I see that is is stamped 15. I did the calculation on it with no modifications and found the slot length to be 7/16, the pin diameter to be 3/16 and came up with the degrees of advance as 15.92. Does this sound correct?

What amount of timing should I shoot for? I figure that if I reduce the slot length to 6/16 I will get 11.94. Does this sound like I am on the right track? 11.94 X 2 = 24 degrees of total mechanical advance?

Car Specs
73 Dart Swinger
225, Comp Cam 264, Headers, Carter BBD, Home Ported Head, Comp Ratio approximately 9.0:1.


Thanks for any help you guys can offer.

I am also in the process of collecting distributors and am recurving mine.
I agree a govenor slot length matrix would be nice to have.
Since Mopar springs are not available anywhere, see my past thread (thanks for the replys), I have not had any luck at any Autoparts houses for springs. Is there any problems using GM or MSD springs since they are so readily available?

I am trying to get more mechanical advance at 2000 rpm. With stock springs all I can get is 10 degrees at 2000 with a 15R govenor. I am running 20 degrees initial, 10 degree mechanical and 13 vacuum for a 43 total. I would like to run 10 degrees initial and 20 degrees mechanical for a little smoother idle and a little more punch. My engine still won't ping, even on the steepest hills.

1. Anyone use the GM/MSD springs?
2. or have a govenor slot matrix?
3. Does anyone know where I can get a 16R Feather Duster vacuum advance. The parts houses are telling me that the VC-208 is discontinued.

All I can find are 11R units and they are getting hard to find.......

Thanks!

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Looks like your cars a little under geared and under carbed...


I have found that if you are looking for a fairly "aggressive" street mechanical curve and don't mid it being too 'linear'.

Swapping your springs for a set of the 'light' springs out of a V-8 distributor (70's big block springs are good), makes for moderate advance that limits out at 2200-2300 rpm (then you can dial in the vacc. adv. from there...)... (Did this to Rob Simmon's distributor, and I run this mix in the Hpak Duster for street use, and seems to work out OK in HiPo Street Applications).

-D.Idiot

To clarify, you used (two) of the "light" stock springs from a 70's big block distributor? Correct?

Mr Gasket sells two super light springs kit#925B for racing.
It says they kick in at 2000 rpm. It also says not for street use. I am sure this is what Mr. Norm must of used when he would recurve distributors for drag racing.

I would love to run more carburation if I could find some good parts that work well together. I am not sure if the Super Six is really worth all the work if a 4 barrel would have good response down low and still get good mileage. I never go over 3000 rpm. That is about 75 mph.

Any thoughts on that?

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Yes, the big block springs are slightly 'stiffer' than our 'light' OEM slant six springs, so they are good for the 'street/perf.' build...I have used the 925B set , and just changing the light spring in a stock slant distributor caused it to be 'full mech adv' by 1600...

Your setup has much more potential (it's pretty close to what I used to run in the Hpak Duster)....gears+vacc. secondary carb+ timing tweak would keep the mileage, and add more 'fun'

(Yeah, I rarely go over 3000 rpm, unless you count 'passing a truck', power shifting on warm days, and those odd times on county roads where I have to make sure it's still able to launch at 6000 rpm...)


-D.Idiot

Would a longer slot help on the recurve as well as the lighter springs? Wouldn't a shorter slot limit the advance? Should I file out my 16R slot another 1/16"?
Do you have slot lengths documented for 9R on up?

Thanks,

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG