Mallory Unilite Distributor #3772101
- Thread starter BNewman
- Start date
tubman
Well-known member
I'm curious as to why this would be. Could you please explain further?
rotorwrench
Well-known member
A 12-volt generator would work as well as a 12-volt alternator but it depends on whether the car is set up for 12-volt negative ground or not. Most of the new electronic stuff is for 12-volt negative ground systems. A 6-volt positive ground system is another matter.
BUBBAS IGNITION
Well-known member
The Mallory electronic dont like the irregular out and voltage swings coming from the generator !!
https://www.summitracing.com/parts/maa-29351
They do make a noise filter , however they are hard to get somedays....also must use a good coil to keep the current flow down...the MSD/Mallory coils are typically too low on resistance........
flathead4rd
Well-known member
The Mallory electronic dont like the irregular out and voltage swings coming from the generator !!
https://www.summitracing.com/parts/maa-29351
They do make a noise filter , however they are hard to get somedays....also must use a good coil to keep the current flow down...the MSD/Mallory coils are typically too low on resistance........
What coil do you recommend? Make & Part number?
tubman
Well-known member
The Mallory electronic dont like the irregular out and voltage swings coming from the generator !!
https://www.summitracing.com/parts/maa-29351
They do make a noise filter , however they are hard to get somedays....also must use a good coil to keep the current flow down...the MSD/Mallory coils are typically too low on resistance........
Mallory should have quit while they were ahead with the ole' "flattop".
rotorwrench
Well-known member
A plain old GM module is damn near bullet proof. I just wonder why they can't make a module that can take all the irregularities. I know it can be done but they just don't want to make the effort.
BUBBAS IGNITION
Well-known member
Based on quality and availablility it changes somedays.
Heres the deal on a flathead (low rpm band and low compression) the 12 volt ignition needs a primary current of approx 3-4 amps. A napa IC12SB (1.5 ohms) and a 1.5 ohm resistor would be 3 ohms divided into 12 volts for a current flow of 4 amps. This set up has worked great forever.
Now to step it up just a bit I have been using a German made coil the Beru ZS172 blue at 3.3 ohms and no resistor for a current flow of 3.63 amps , i have shipped over 100 of these and they seem to work very well ! I still like the Bosch Blue # 00012 coil at 3ohms as well, just because it is shipped with a nice mounting bracket..
The main thing is to have a current flow of approx 3-4 amps in the primary.
Now if we are discussing a 12 -13 to 1 compression at 8,000 rpm , thats a different story !! But we just dont need it with the flatheads......
flatheadmurre
Well-known member
Still amazes me why anyone developing a new distributor makes a product that has no advantages over the crab...
If you absolutely wan´t electronic a converted crab is still a better unit...just my 2c.
When someone makes a crab with an adjustable vacuum canister then it´s improving...until then i´m not to impressed...
If you absolutely wan´t electronic a converted crab is still a better unit...just my 2c.
When someone makes a crab with an adjustable vacuum canister then it´s improving...until then i´m not to impressed...
BUBBAS IGNITION
Well-known member
Phil Gillespie
Well-known member
Based on quality and availablility it changes somedays.
Heres the deal on a flathead (low rpm band and low compression) the 12 volt ignition needs a primary current of approx 3-4 amps. A napa IC12SB (1.5 ohms) and a 1.5 ohm resistor would be 3 ohms divided into 12 volts for a current flow of 4 amps. This set up has worked great forever.
Now to step it up just a bit I have been using a German made coil the Beru ZS172 blue at 3.3 ohms and no resistor for a current flow of 3.63 amps , i have shipped over 100 of these and they seem to work very well ! I still like the Bosch Blue # 00012 coil at 3ohms as well, just because it is shipped with a nice mounting bracket..
The main thing is to have a current flow of approx 3-4 amps in the primary.
Now if we are discussing a 12 -13 to 1 compression at 8,000 rpm , thats a different story !! But we just dont need it with the flatheads......
The 3 to 4 amps in the primary side, does this also apply to 6v original coil with resistor?
Phil NZ
JSeery
Member Emeritus
Yes. It is I=V/R, I is the current (Amps), V is the Voltage and R is the resistance (Ohms). The resistance consist of everything in the circuit, but the major components are the resistance of the coil itself and any ballast resistor.
Last edited:
Phil Gillespie
Well-known member
Just refreshing my memory on the Ohms Law. So on safe side minimum being 1.5 ohms for the 6v for max 4 amp draw. There is a reason for everything it just a case of remembering!!
Thanks,
Phil NZ