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1954 IAZ distributor curving
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dodge59
Posted 2013-04-18 4:27 PM (#370503)
Subject: 1954 IAZ distributor curving



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I have a 1954 IAZ 4003A distributor dual point I want to recurve in my 241 redram hemi with dual exhaust mod. that's all.

for this particular dist ....should I just replace the secondary spring to a light one ? and / or weld up the slots a bit to limit mechanical advance? Maybe both . how many degrees does the bottom slotted plate have built in ?
I only have one donar distributor .

also a 10-11 vac arm for cruising?

just tweaking the old hemi that's all. not make a race car.
eventually .. I want to install a offy 4 intake and a 4 barrel wcfb carb .

Thanks !


Edited by dodge59 2013-04-18 4:58 PM
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ttotired
Posted 2013-04-18 7:58 PM (#370545 - in reply to #370503)
Subject: Re: 1954 IAZ distributor curving



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Never messed with one, but I would advise setting the rest of the car up for how you want it, then work out what advance curves work best for your engine and get it set up to that.

A little dyno time will tell you what will work best (provided your dyno man knows about distributors), I think a lot of them know more about ecm chips than advance weights now

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dodge59
Posted 2013-04-19 10:38 AM (#370624 - in reply to #370545)
Subject: Re: 1954 IAZ distributor curving



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ttotired

thanks ! keeping that in consideration .
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d500neil
Posted 2013-04-19 4:04 PM (#370721 - in reply to #370503)
Subject: RE: 1954 IAZ distributor curving



Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!

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John, I just checked, and I do not have the distributor specs on your guy.

However, they should be shown on a Sun-brand Tune-up card, and on Page 9 of your
American Manufacturers Association Specifications sheets.

These documents may require some interpretation of their advancements information
because that info could have been put out in better plain language, on them.



(PICT0595.JPG)



(PICT0596.JPG)



(PICT0597.JPG)



Attachments
----------------
Attachments PICT0595.JPG (104KB - 49 downloads)
Attachments PICT0596.JPG (99KB - 52 downloads)
Attachments PICT0597.JPG (54KB - 51 downloads)
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dodge59
Posted 2013-04-19 4:43 PM (#370730 - in reply to #370721)
Subject: RE: 1954 IAZ distributor curving



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neil
great information Thanks !
I seen some other previous posts about these IAZ distrbutors curving from you and others .. from what I make of it , this 4003A IAZ still needs a different slotted plate or weld the ends up some to take some MA out of it. correct? plus the lighter spring.
and maybe a 10-11 vac arm for cuising speeds. .
john
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dodge59
Posted 2013-04-19 7:15 PM (#370763 - in reply to #370503)
Subject: Re: 1954 IAZ distributor curving



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found this neil ...... Remember this post awhile back ?


Posted 2011-05-07 3:08 PM (#271528 - in reply to #271487)
Subject: Re: 270 super red ram

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Location: bishop, ca Just did a little research on the 270 2-bbl and 4-bbl Hemi distributors and both Hemi versions share the same IAZ 4003F
units.

That dual-point dissie's advance curve is ok/good, but not very-fast (like the Holy Grail 55 Windsor's IAZ 4001E is).

The IAZ 4003F has more mechanical advancement (24 degrees) built into it than a lot of other 50's MoPar dissies, including
all of the 300's dissies.

The 4003F is recommended (in 1955) for 4 degrees of initial (engine) advancement plus its 24 degrees of MA, along with
a Vacuum Advancement of 14 degrees = 42 total degrees.

The 4003F can be hot-rodded by replacing its secondary spring with another dissie's (lighter weight) primary spring (for faster
advancement under acceleration), and the VA can be replaced with a 16 degree guy, and the Initial Advancement can be set
for about 8 degrees, so that a 55 Hemi-guy can get: 8+24+16= 46 degrees of total advancement, along with the lighter secondary spring (for faster advancement)....

THEN, you '55 Super Red Ram Guys (no D500's til '56) can go install Pertronix's "Ignitor 1383" Electronic Ignition system into
that 4003F, and, then, have some REAL fun (as well as receiving the admiring looks at what you've got, UNDER your car's hood!)




Edited by dodge59 2013-04-19 7:20 PM
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dodge59
Posted 2013-04-19 7:30 PM (#370769 - in reply to #370763)
Subject: Re: 1954 IAZ distributor curving



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I have my advance set at 10* right now and the hemi seems to like it there. very snappy.
this IAZ 4003F is very similar to my 4003A I believe just from what you are saying about the timing.. etc.

would this set up in the 4003F modified be a good one for my 241 hemi ?
maybe I have just a tad bit too much IA.

I've set up a few mopar sb 340 360 distributors in the past and I set them up with 18* IA.. and they love it . with 34* Total . no VA .
couple of them I had to weld the slots up a bit ...







Edited by dodge59 2013-04-19 9:00 PM
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MOPAR-TO-YA
Posted 2013-04-20 2:41 AM (#370825 - in reply to #370769)
Subject: Re: 1954 IAZ distributor curving


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dodge59 - 2013-04-19 6:30 PM

I have my advance set at 10* right now and the hemi seems to like it there. very snappy.
this IAZ 4003F is very similar to my 4003A I believe just from what you are saying about the timing.. etc.

would this set up in the 4003F modified be a good one for my 241 hemi ?
maybe I have just a tad bit too much IA.

I've set up a few mopar sb 340 360 distributors in the past and I set them up with 18* IA.. and they love it . with 34* Total . no VA .
couple of them I had to weld the slots up a bit ...





When you set up a dist. with no vacume advance, what are the characteristics of how the engine performs? ( starting the engine- keeping down pre- ignition-etc.)
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Shep
Posted 2013-04-20 8:58 AM (#370843 - in reply to #370825)
Subject: Re: 1954 IAZ distributor curving



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Remember any Hemi head designed engine does not respond to too much timing like a wedge head engine, about 34 total mechanical is it.
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dodge59
Posted 2013-04-20 11:53 AM (#370874 - in reply to #370825)
Subject: Re: 1954 IAZ distributor curving



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mopar

I set them according to info from others that have done it.. all kinds of info on curving distributors out there .

I've had two abody dart race cars with sb 340-360 and I just know from experience what theses engines like . usually 34* total and 18* initial. no vac adv .

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dodge59
Posted 2013-04-20 11:57 AM (#370875 - in reply to #370843)
Subject: Re: 1954 IAZ distributor curving



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Shep - 2013-04-20 7:58 AM

Remember any Hemi head designed engine does not respond to too much timing like a wedge head engine, about 34 total mechanical is it.


thanks shep.

so .. from what I here , you can't set the old hemis up like a sb mopar 360 race engine ?

old hemis only like 10* max IA .. why is that ? .. don't understand that.. why wouldn't they want more ?

Thanks !
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Shep
Posted 2013-04-20 1:30 PM (#370885 - in reply to #370875)
Subject: Re: 1954 IAZ distributor curving



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Hold on I am only referring to 34 total, the initial depends on what the mechanical advance is then you want the two to add up to 34 total, if the the dist is 24 say then yes the initial would be 10. I am running my stock rebuilt 331 at an initial at 8 degrees, the stock dist has a mechaincal max advance of 26 degrees engine. =34 degrees. My Max Wedge race car was running at 38 degrees total, all in at 3k.
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d500neil
Posted 2013-04-20 6:18 PM (#370915 - in reply to #370885)
Subject: Re: 1954 IAZ distributor curving



Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!

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John, you specified the 4003A distributor.

Each suffix pertains to a relatively (-very) different advancement in the dissies.

All IAZ dissies are dual points (dualies are needed for a Pertronix under-cap "Ignitor 1383" installation, in any Hemi/Poly
engine).

All IAZ's are created differently, advancement-wise.

What anyone should do, at the least, is either figure out (above) what your dissie's built-in mechanical advancement is,
or, better yet, get it put onto a distributor-evaluator, so that the selection of the proper primary and secondary springs'
strengths may be made, and so that its advancement-slot can be lengthened or shortened, to dial-in the RATE (from the
two springs' strengths) of advancement, and the AMOUNT (the length of the slot) of advancement can be created---hopefully
so that the M.A. can be about 28 degrees, and with the engine's Adjustable Initial Advancement set somewhere in the
range of 6-8 degrees.

With the M.A. adjusted to about 28 degrees, you can start looking for a Vacuum Advance of about 12 (stamped-6) or
14 (stamped-7) degrees.

Your I.A. can be varied to accommodate the M.A. and the V.A. so as to produce Total Advancement of something not-
over 50 degrees, with a 4-bbl carb.

A 2-bbl carb can have the T.A. above 50 degrees, because the 2-bbl set up is not able to provide a 'full' fuel/air charge to
the combustion chamber, which results in a lower pressure (and no detonation) in the combustion chamber.




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d500neil
Posted 2013-04-20 6:28 PM (#370920 - in reply to #370503)
Subject: Re: 1954 IAZ distributor curving



Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!

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Above 10 degrees of I.A. (altho the Hot Rod boys dialed in 12-degrees on their 58 Wedge 361 Fury), the car will become
hard to start and/or will produce detonation, because the piston would be too-deep inside the cylinder, with the engine turning-
over at a slow rate, when the spark plug would ignite.

Too low of I.A (like 1-3 degrees; some OEM literature mentions 4 degrees of I.A) means that the piston is almost at TDC
which means that poor fuel/air mixture and compression occurs; bad emissions/soot/carbon/economy and poor performance
results therefrom.


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d500neil
Posted 2013-04-20 6:33 PM (#370922 - in reply to #370503)
Subject: Re: 1954 IAZ distributor curving



Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!

Posts: 19171
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Location: bishop, ca
34-36 is the sweet spot for Hemi/Poly M.A., with the 'help' of the engine's Initial Advancement adjustment.

The light weight springs will allow you to get to the max-M.A. quickly, when the RPM is increased (acceleration).

Once you get to 34-36, the V.A. will contribute more advancement during high speed cruise mode, when the engine
is settled in, at 3K-ish RPM.





Edited by d500neil 2013-04-20 8:17 PM
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dodge59
Posted 2013-04-20 11:55 PM (#370951 - in reply to #370503)
Subject: Re: 1954 IAZ distributor curving



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Thanks guys !
you are always a big help.

well ... only way I'm going to find out what the MA is built into my dist is to take it apart and look see what the slotted plate is stamped. then go from there. unless there is some IAZ distributor specs out there for my IAZ 4003A dist.

Thanks again ALL !
I rebuilt the front wheel cylinders and install a new pinion seal today.. I'm bushed. ! but had fun ! love these old mopars !
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Powerflite
Posted 2020-10-24 4:25 PM (#604884 - in reply to #370503)
Subject: Re: 1954 IAZ distributor curving



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Well, I'm only 7 years late with the info. But here is a chart with distributor advance amounts for Dodge distributors.



Attachments
----------------
Attachments Dodge Distributors.pdf (170KB - 19 downloads)
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dodge59
Posted 2020-10-24 5:02 PM (#604888 - in reply to #604884)
Subject: Re: 1954 IAZ distributor curving



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Thanks Powerflite ! Good info to have  on this Baby Hemi 241 ! 

 

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