Re: spark knock after ignition upgrade?
[Re: jd451]
#1828817
05/17/15 10:26 PM
05/17/15 10:26 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
X4 something else was changed (which changed your curve). You might plot the curve then toss the old box/coil back in & plot its curve & compare em. reportedly orange (& maybe other) boxes can pull timing so if the HEI did not ( I believe it is good regarding that) then that could (inadvertently) have pushed you over the limit by default
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: spark knock after ignition upgrade?
[Re: RapidRobert]
#1828868
05/17/15 11:36 PM
05/17/15 11:36 PM
|
Joined: Jan 2003
Posts: 2,863 middle Tennessee
mopower440
OP
master
|
OP
master
Joined: Jan 2003
Posts: 2,863
middle Tennessee
|
X4 something else was changed (which changed your curve). You might plot the curve then toss the old box/coil back in & plot its curve & compare em. reportedly orange (& maybe other) boxes can pull timing so if the HEI did not ( I believe it is good regarding that) then that could (inadvertently) have pushed you over the limit by default well, i wasnt using the orange box, it was just a parts house cheapo, wondering if they also pulled timing like the orange box because that would explain it! I have not messed with the distributor at all so..
|
|
|
Re: spark knock after ignition upgrade?
[Re: NITROUSN]
#1828897
05/18/15 12:26 AM
05/18/15 12:26 AM
|
Joined: Jan 2003
Posts: 2,863 middle Tennessee
mopower440
OP
master
|
OP
master
Joined: Jan 2003
Posts: 2,863
middle Tennessee
|
well, i wasnt using the orange box, it was just a parts house cheapo, wondering if they also pulled timing like the orange box because that would explain it! I have not messed with the distributor at all so.. So. Get a timing light and see where the timing is. Why play a guessing game when you can verify something critical and basic easily. I will do that, but i was wondering if anyone here knows if all the cheap parts house mopar boxes retarded the timing as well like the MP orange one did..?
|
|
|
Re: spark knock after ignition upgrade?
[Re: mopower440]
#1829295
05/18/15 04:24 PM
05/18/15 04:24 PM
|
Joined: Jan 2003
Posts: 75,125 A Banana Republic near you.
JohnRR
I Win
|
I Win
Joined: Jan 2003
Posts: 75,125
A Banana Republic near you.
|
X4 something else was changed (which changed your curve). You might plot the curve then toss the old box/coil back in & plot its curve & compare em. reportedly orange (& maybe other) boxes can pull timing so if the HEI did not ( I believe it is good regarding that) then that could (inadvertently) have pushed you over the limit by default well, i wasnt using the orange box, it was just a parts house cheapo, wondering if they also pulled timing like the orange box because that would explain it! I have not messed with the distributor at all so.. Did you reset your timing after you changed parts ?
|
|
|
Re: spark knock after ignition upgrade?
[Re: dogdays]
#1829311
05/18/15 04:49 PM
05/18/15 04:49 PM
|
Joined: Feb 2003
Posts: 8,720
Andrewh
master
|
master
Joined: Feb 2003
Posts: 8,720
|
No mystery to me. Your empirical data seems to show that your Mopar-like box was a little slow on the uptake. You'll have to redo your ignition advance.
"Pulls timing" usually refers to making the spark later and later as engine rpm goes up. In your case as it seems to be doing it right from idle, I'd call it a built-in delay.
R. This. pertronix swap even has a warning on the instructions, that changing it may cause timing changes, even if you didn't do anything else. the part that controls the spark is known to cause timing changes. not a surprise.
|
|
|
Re: spark knock after ignition upgrade?
[Re: dogdays]
#1830252
05/19/15 07:28 PM
05/19/15 07:28 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
I would for sure before I did any changes, plot the 2 curves, if you dont have a dialback you can make marks on the dampener at say 17.5 20 22.5 25 27.5 30 32.5 35. Your timing tab will cover you to 15 then cut/measure a strip of paper with your calipers for a ruler & 0.0632683" is (1) degree & IE 35.5 degrees is 2&1/4" (2.246"). EDIT just note (1) the RPM you reach each point at (2) total degrees (& at what RPM) (3) compare the two. getting a baseline comes first
Last edited by RapidRobert; 05/19/15 07:36 PM.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: spark knock after ignition upgrade?
[Re: mopower440]
#1830355
05/19/15 09:56 PM
05/19/15 09:56 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
that definitely explains what caused the pinging! but a box/coil ch would not account for a 10 deg increase in total.. Sumpin else changed: (slots). EDIT but the slots did not change, we're missing something/makes no sense
Last edited by RapidRobert; 05/19/15 10:59 PM.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: spark knock after ignition upgrade?
[Re: RapidRobert]
#1830436
05/19/15 11:42 PM
05/19/15 11:42 PM
|
Joined: Jan 2003
Posts: 2,863 middle Tennessee
mopower440
OP
master
|
OP
master
Joined: Jan 2003
Posts: 2,863
middle Tennessee
|
that definitely explains what caused the pinging! but a box/coil ch would not account for a 10 deg increase in total.. Sumpin else changed: (slots). EDIT but the slots did not change, we're missing something/makes no sense no sense at all..lol..sucks i have to tear down the dizzy and do this all over again..
|
|
|
Re: spark knock after ignition upgrade?
[Re: mopower440]
#1830445
05/19/15 11:48 PM
05/19/15 11:48 PM
|
Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
when you get inside the dist as you know holler if you see anything that has changed
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: spark knock after ignition upgrade?
[Re: RapidRobert]
#1830475
05/20/15 12:14 AM
05/20/15 12:14 AM
|
Joined: Jan 2003
Posts: 2,863 middle Tennessee
mopower440
OP
master
|
OP
master
Joined: Jan 2003
Posts: 2,863
middle Tennessee
|
when you get inside the dist as you know holler if you see anything that has changed Will do Rob! I would just leave it with the initial down to 12-14 but it doesnt seem as strong off the line as it does with the initial up around 18..
|
|
|
|
|