Wires for Pertronix 72 280se 4.5 - Mercedes-Benz Forum

 
LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 12-25-2009, 05:52 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Nov 2009
Vehicle: 1972 280se 4.5 Silver/Maroon
Location: Ga
Posts: 27
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Wires for Pertronix 72 280se 4.5

Hello and thanks in advance. I am ordering the ignitor and the flamethrower coil for my 72 s80se 4.5. I am a bit confused on which wires. I am already using resistor plugs (got them a the parts store before I even new there were two types). Will these work on this app. PerTronix 708102 - PerTronix Flame-Thrower 7mm Stock Look Spark Plug Wire Sets - Overview - SummitRacing.com

I am having ignition issues since I removed my dist to replace water pump. May have a bad wire or two now. Removed and installed cap a lot tinkering. Just got new cap and rotor . I can here some clicking in under/ around the cap . sounds like sparking. I may have to get new plugs with the right ends for the new wires, probably these are not the screw end style. I have thrown out all of the removable caps for the plugs. My timing or sparking is so bad it fouls the plugs almost immediately. Hoping the Ignitor/ coils/ wires/ timing will have me back up. Thanks a lot.
marcedesbenz is offline  
Sponsored Links
Advertisement
 
post #2 of 8 (permalink) Old 12-26-2009, 12:14 AM
BenzWorld Elite
 
Grubeguy's Avatar
 
Date registered: Jan 2006
Vehicle: 73 280SE 4.5, 71 300SEL, 03 BMW Z4, 72 Fiat 850, 80 Triumph TR7, 85 Porsche 911
Location: DC Area
Posts: 2,110
Mentioned: 1 Post(s)
Quoted: 95 Post(s)
Send a message via MSN to Grubeguy Send a message via Yahoo to Grubeguy
But it ran prior to the pertronix being put in?
Grubeguy is online now  
post #3 of 8 (permalink) Old 12-26-2009, 10:30 AM Thread Starter
BenzWorld Junior Member
 
Date registered: Nov 2009
Vehicle: 1972 280se 4.5 Silver/Maroon
Location: Ga
Posts: 27
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
I haven't installed the pertronix yet. Should have it tuesday. Still has points. But ran pretty well before I removed distributor. Something is not right with the timing. But I think I have a bad wire from all the removing and bending the cap. I need to order new wires for the Pertronix system. I plan on using resistor plugs. Are any universal wires ok?
marcedesbenz is offline  
post #4 of 8 (permalink) Old 12-26-2009, 02:07 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Nov 2009
Vehicle: 1972 280se 4.5 Silver/Maroon
Location: Ga
Posts: 27
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Identified at least one wire mis firing. Took it out , seems to have helped or stopped the surging at idle. But seems to run better advanced way up like 25 with vac attached! Timing chain stretched that much? Ouch
marcedesbenz is offline  
post #5 of 8 (permalink) Old 12-26-2009, 04:38 PM
BenzWorld Elite
 
MBGraham's Avatar
 
Date registered: Oct 2006
Vehicle: '72 350SL, '85 300D, '98 E320, '14 GLK250
Location: Ont, Canada
Posts: 7,832
Mentioned: 1 Post(s)
Quoted: 8 Post(s)
Quote:
Originally Posted by marcedesbenz View Post
Identified at least one wire mis firing. Took it out , seems to have helped or stopped the surging at idle. But seems to run better advanced way up like 25 with vac attached! Timing chain stretched that much? Ouch
The timing for these engines, is 25-30 deg BTDC without vac. at 3000 rpm. the slot doesn't go much further than that, so you should be OK.

To reset your timing, plug teh vac tube. Then set rpm at 3000rpm and turn distributor CCW until it is almost at end of travel and you have close to 30 deg BTDC. Car will run best there.

This shows nothing about the timing chain.

To check that you need to set the pass side cam on its TDC mark and then see what the marks on the balancer say. (always turning CW!)

If you have bad running issues and you had the distrib out, make sure when balancer is at TDC, that the rotor points at the TDC mark on the distr housing.

The surging at idle indicates that idle speed is too high (1500rpm+). Adjust it back below 1500rpm and surging should stop. If you can't lower the idle speed, you have a vacuum leak. If it is only when cold, it could be the Aux Air Valve sticking closed.

These cars are supposed to have copper core wires. I would dump those wires. Bosch or Beru have wires for these cars. Resistor plugs are fine if you use the Bosch wires.

Do you know how to wire the Pertronix? If not ask - It is nothing like what Petronix says. You could start by just replacing the points and once you have it runing well, then go on to changing the coil. When you change the coil, you might find your tach no longer works.

Have fun!

Last edited by MBGraham; 12-26-2009 at 04:46 PM.
MBGraham is online now  
post #6 of 8 (permalink) Old 12-26-2009, 05:36 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Nov 2009
Vehicle: 1972 280se 4.5 Silver/Maroon
Location: Ga
Posts: 27
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Well if I go all the way CCW on my dizzy its about 27 btdc just at idle. There is no tach on my car, so I'm going to need to get one to dial it in. It looks pretty clear on the Pertronix install. Just bypass the merc ignition module all together. I just assume use the flamethrower coil when I do it. The surging went away when I took out the bad wire. Used a timing light to identify the mis fire. Runs decent now. Just need to wait for the pertronix stuff to get here. Did anyone check the link above on thos wires. Would they be fine. Not sure which ones your saying to get rid of. Mine now are just oringinal 5 K wires. Thanks
marcedesbenz is offline  
post #7 of 8 (permalink) Old 12-26-2009, 05:57 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Nov 2009
Vehicle: 1972 280se 4.5 Silver/Maroon
Location: Ga
Posts: 27
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Could it be that the dist. is in the wrong gear maybe one over? Also when put in gear the load drops the idle and I had an occasional thumping noise. ( not good) drop the timing back to 8 btdc without vac and seems better. Plug in vac and it went to about 5 atdc. Almost at the limit of the dizzy clockwise for these readings. Thanks
marcedesbenz is offline  
post #8 of 8 (permalink) Old 12-29-2009, 04:21 PM Thread Starter
BenzWorld Junior Member
 
Date registered: Nov 2009
Vehicle: 1972 280se 4.5 Silver/Maroon
Location: Ga
Posts: 27
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Installed the pertronix ignitor and the flamethrower coil today. Works great. Better throttle response. I'm still concerned about the 5k plug wires with the resistor plugs. Probably not the right setup. My vac retard quit working with the pertronix install, not sure why , worked before just fine before . I took the cap back off and doesn't seem to be anything blocking it, the plate moves fairly easily. Any thoughts appreciated, sure nice to not worry about points anymore!
marcedesbenz is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > General Mercedes-Benz Forums > Vintage Mercedes-Benz

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











  • Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
     
    Thread Tools
    Show Printable Version Show Printable Version
    Email this Page Email this Page
    Display Modes
    Linear Mode Linear Mode



    Similar Threads
    Topic Author Forum Replies Last Post
    pertronix ignition mercedesw115 Vintage Mercedes-Benz 6 03-19-2009 09:47 AM
    Just dont know which Pertronix RC4U12 R/C107 SL/SLC Class 5 12-06-2008 06:04 PM
    need help with pertronix stuff benz280se Vintage Mercedes-Benz 3 04-09-2008 12:42 AM
    pertronix ignition/wires experience? aegir slc R/C107 SL/SLC Class 0 12-06-2007 11:37 AM
    Pertronix michael l Unimog 1 07-03-2004 09:47 PM

    Posting Rules  
    You may post new threads
    You may post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are On
    Pingbacks are On
    Refbacks are On

     

    Title goes here

    close
    video goes here
    description goes here. Read Full Story
    For the best viewing experience please update your browser to Google Chrome