[Maximus21]

Hello Folks,
Hope everyone is well, many thanks to everyone on this community!
i installed a pertronix distributor d100700, coil 45011 and ac delco r44xls plugs to my 65 stock 396/325hp, the "interim shop manual" recommends timing (BTDC)2 range of 2-8 deg. for standard ignition and 4-16 deg. transistorized ignition, the y add that timing should be advance as far as possible within specs.
What do you guys think ?
Thanks

 

[japete92]

This may help:

Ignition 101

A common problem that comes up here on TC is ignition setup. Much of the discussion devolves into "this works for me" without supporting data. These can be misleading and sometimes just wrong. What follows is some very helpful information about how ignition works that I have compiled from...

www.chevelles.com

It's the combination of 'initial' and 'vacuum'. A total of approx 24 degrees BTDC is a very 'good' place to be.

'Measure' how many degrees of advance you get at idle with full manifold vacuum advance. AND 'measure' the initial timing with the vacuum advance disconnected/plugged. 12 initial/12vacuum, or 14 initial/10 vacuum or anywhere in the range is fine. 10 initial/15 vacuum is about where a vacuum limiter would be employed.

Reading the attached (authored by Dave Ray) may help.

Mechanical/centrifugal is not 'adjustable' but can be changed by futzing with the springs and weights. Don't bother unless it's necessary.

Pete

 

[BA.]

Lots of great info in there. Definitely agree that you're best served in the 10-16 range. Lots of varying factors go into whats best for you though. Engine condition, gas quality, elevation, average temperature, timing in the distributor weights/springs, etc.

 

[Maximus21]

Hello Folks,
well i call pertronix to get technical assistance on the ignition timing since i install the flame thrower 2 distributor and coil on my stock 396/325 stock engine, the tech said not to change the timing from the stock points ignition(65 Chevrolet manual recommends(btdc) 2-8 deg with standard ignition and 4-16 deg with transistorized ignition with advance hose disconnected and pluged, Chevrolet also recommends to advance as far as possible, i did the standard and i got some serious back fire! i kept messing with it until i got 16deg and it appears to be good, connected the vac and checked again at about 2900 rpm 32 deg.
what do you guys think
good day
Max

 

[Maximus21]

Hello Folks,
well i call pertronix to get technical assistance on the ignition timing since i install the flame thrower 2 distributor and coil on my stock 396/325 stock engine, the tech said not to change the timing from the stock points ignition(65 Chevrolet manual recommends(btdc) 2-8 deg with standard ignition and 4-16 deg with transistorized ignition with advance hose disconnected and pluged, Chevrolet also recommends to advance as far as possible, i did the standard and i got some serious back fire! i kept messing with it until i got 16deg and it appears to be good, connected the vac and checked again at about 2900 rpm 32 deg.
what do you guys think
good day
Max

i think it back fire because the distributor vac was still unplugged, time it to 8 deg at 650 rpm and ran pretty good

 

[Jim Trucksis]

Hello Folks,
Hope everyone is well, many thanks to everyone on this community!
i installed a pertronix distributor d100700, coil 45011 and ac delco r44xls plugs to my 65 stock 396/325hp, the "interim shop manual" recommends timing (BTDC)2 range of 2-8 deg. for standard ignition and 4-16 deg. transistorized ignition, the y add that timing should be advance as far as possible within specs.
What do you guys think ?
Thanks

I may be a bit confused, but your Pertronix system takes the place of your old points system but is not classified as a transistorized ignition which was available back in the day. I have Pertronix ignition in two 327's, from '64 and '65, and I used standard factory settings for timing and both cars run fine.

 

[Maximus21]

Thanks a million
I went ahead and did the factory recommendations of 8 deg at 650 rpm and she tested very good
Thanks again
Max