Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered
 
johncmng's Avatar
 
Join Date: May 2006
Location: San Jose, CA.
Posts: 247
Porsche Crest what is the diff between ignition and coils

I'm a little bit confused about the MSD ignition unit and coil. What does each of those do? Do I need both? And how much of a performance gain would I get out of it?

Thanks
John

Old 06-26-2007, 10:19 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered
 
randywebb's Avatar
 
Join Date: Nov 2004
Location: Greater Metropolitan Nimrod, Oregun
Posts: 10,040
you need both

the coil's impedance is matched to the 'box'

the box is a transistorized ignition unit; the coil stores energy until 'told' to release it all at once

there is no big perf. gain

you need to find a 'how it works' type book or internet site and read thru that to get some background info
__________________
"A man with his priorities so far out of whack doesn't deserve such a fine automobile."

- Ferris Bueller's Day Off
Old 06-26-2007, 10:46 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered
 
Join Date: Jan 2006
Location: Alameda, CA
Posts: 419
What if the impedances don't match? (i.e. different manufacturers)
Old 06-26-2007, 10:55 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered
 
Join Date: Jul 2000
Location: So. Calif.
Posts: 19,910
The ignition box creates higher than source voltage (12v) via transistors and other elec. circuitry. The high voltage circuit connects to the coil primary windings. The voltage could be several hundred volts.

There are two windings in a coil (a step up transformer) - primary winding and secondary winding. Current flow through primary winding creates a magnetic field around the secondary windings. When the voltage/current signal stops (points open or other elec. signal), the mag. field stops (collapses) which in turn induces a higher voltage in the secondary winding, the end of which ends at the center tower terminal, then to the dist. cap. via the coil wire.

Sherwood
Old 06-26-2007, 12:19 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered
 
T77911S's Avatar
 
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
very nice sherwood
the MSD unit puts out about 450V. the coil is about 100:1 setup. that equals 45,000 V ! can you say OUCH! but it has very, very low current.
the "box" stores energy in a large capacitor.
i currently have an MSD with a permatune coil.
__________________
86 930 94kmiles [__] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
03 BMW 330CI 220K:: [__] RUNNING: [__] NOT RUNNING:
01 suburban 330K:: [__] RUNNING: [__] NOT RUNNING:
RACE CAR:: sold
Old 06-26-2007, 03:59 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered
 
barney911rs's Avatar
 
Join Date: Mar 2004
Location: St. Petersburg, FL (at least temporarily)
Posts: 1,257
Garage
I found when I put the MSD 6AL and the MSD Blaster Coil on my car, it helped the low RPM and idle smoother with the multiple spark. The only thing you get on the high end is a little hotter spark. If you are looking to use an MSD ignition, I would suggest you use one of their coils as well. I'm also using a Pertronix Ignitor. My ignition has been bullet proof since making these changes. They will work just as well on a street, occasional track, to full on race car.

__________________
John Snodgrass
1973 Porsche 911 "Barney" (race car for sale)
2008 Nissan Maxima - Daily Driver
1999 F350 Diesel Crew Cab - Tow Beast
1990 Airstream 36' Land Yacht - Home Away From Home
Old 06-26-2007, 06:45 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Reply


 


All times are GMT -8. The time now is 05:01 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.