Talk:Distributor

message: This article has had Distributor Cap Merged into it. Judgesurreal777 22:42, 4 March 2006 (UTC)
thread_title: Merger

message: is an ignition cap the same as a distributor CAP if not wha'ts the difference?
Karlos Romni 22:32, 14 December 2006 (UTC)
thread_title:  is an ignition cap the same as a distributor CAP? 

message: Where does the force come from that spins the rotor in the cap?
:from the main engine shaft, or a side shaft connected directly to the main shaft via cog-wheels. Ai.unit (talk) 14:23, 15 January 2008 (UTC)
thread_title:  What spins the rotor? 

message: I suggest adding this paragraph to the article:
Cars that use the mechanical distributor often fail if they run into ponds (like when it rains heavily) and that's because the water that leaks inside the distributor shorts the electric current that should go thru the spark plug, and reroutes it directly to the body of the vehicle (aka earth), and this in turn causes the engine to stop due to the fuel not being ignited in the cylinders.
This problem can be fixed by opening the distributor's cap and wiping the cam and the contacts dry with tissue paper or by blowing hot air.
Anybody minds?
Ai.unit (talk) 14:30, 15 January 2008 (UTC)
replies: text:  OK. I added it. Ai.unit (talk) 03:25, 1 March 2008 (UTC)
thread_title:  When moist gets into the mechanical distributor 

message: "This ignition was developed by Charles Kettering and was a wonder in its day."
What? dosent seem to make sense, and dosent really need to be written there  —Preceding unsigned comment added by 213.107.10.216 (talk) 19:25, 19 May 2009 (UTC)
thread_title:  "Was a wonder in its day." 

message: # There is no photo of a complete distributor.
;;* distributor cap, rotor, points are shown individually
;;* condensor and plug leads  NOT shown
# The pictures currently on this page are pretty poor. There is a much  better picture of a distributors outside, '"Verdelerkap.jpg", in Wikimedia commons.
# There is no photo of the inside of a distributor. Need to show points, 'condensor', centrifugal/vacuum advance mechanism etc.
# Drawing or cross-sectio showing the physical relation of parts to each other would make distributor easier to understand.
# Photos of contactless 'hall effect' and optical 'points' would be good --220.101.28.25 (talk) 13:34, 27 October 2009 (UTC)
thread_title:  Graphics/Pictures Comments 

message: Photo of distributor complete with cap
;*http://commons.wikimedia.org/wiki/File:Spinterogeno.JPG
Photo of point mounting plate removed from dist. nb DUAL points
;*http://commons.wikimedia.org/wiki/File:Unterbrecherplatte.jpg
Photo of distributor on motor, c/w high tension leads
;*http://commons.wikimedia.org/wiki/File:Impianto_d%27accensione_IDI_completa.jpg
--220.101.28.25 (talk) 12:51, 28 October 2009 (UTC)
thread_title:  Available graphics on commons 

message: On a 'Widescreen' there is a huge amount of white space at the bottom of the screen. The pics ( breaker, disrib. cap, rotor button) may look better in a 'gallery' across the bottom of the screen? Distributor however should stay at top, right.
--203.63.130.37 (talk) 05:43, 30 November 2009 (UTC)
thread_title:  Widescreen  

message: Is there supposed to be 16K ohm resistance from coil contact in distributor cap to rotor contact inside distributor cap in a 1993 Geo Prizm (toyota Corolla)?  — Preceding unsigned comment added by 71.131.3.136 (talk) 02:28, 30 November 2013 (UTC)
thread_title:  Any resistors in a distributor cap? 

message: 90.192.96.131 (talk) (couldn't remember my login details) The picture shows points and a distributor, with a spark occurring in the distributor. Is this correct? Surely the points have the spark and the distributor should ideally not have a spark?   — Preceding undated comment added 14:12, 31 December 2014 (UTC)
replies: text: The spark is undesirable but it does actually happen. As the rotor approaches the nest terminal (post), a spark jumps ahead in its eagerness to form a circuit. This is one of the major causes of the post wearing down. The spark also introduces a bit of undesired randomness to the ignition timing. These are among the reasons why new cars now have a coil on each cylinder and no distributor.  Stepho  talk  07:16, 2 January 2015 (UTC)
thread_title:  Spark 

message: From what I understand, the distributor will send secondary voltage to the spark plugs in "firing order." The numbers on the output caps read, clockwise, 1, 3, 4, 2. There are no numbers on the spark plugs, but assuming their position indicates their number, then read left to right we have spark plug #1, sparkplug #2, #3, and #4. Assuming that the rotor arm only moves in a clockwise direction, as indicated by the arrow, spark plugs numbers 1 & 3 will be "fired" before spark plug #4, and spark plug #2 will be "fired" last. Is this correct? Is this always the "order" the spark plugs are fired?
If I'm correct, is there a way to indicate this in the text, or to indicate what the spark plug numbers are (or how the numbering is done)? Ileanadu (talk) 15:15, 8 April 2017 (UTC)
replies: text: There ought to be an article on firing order. For inline four cylinder four stroke engines there are only a couple of orders that make sense - largely depending on the shape of the crankshaft. For engines with more cylinders, there are many more options. Andy Dingley (talk) 16:01, 8 April 2017 (UTC)
replies: text: Part of the confusion is because the distributor does not determine the firing order. The distributor selects outputs in turn but in theory the spark plug leads can be connected to any spark plug. However, as Andy said, only a few orders make sense (1342 being common on 4 cylinders). For ease of maintenance, the manufacturer often has their chosen firing order embossed on the distributor cap but it can be changed. When my car was upgraded to a later model engine, the distributor had to be moved from the rear of the camshaft to the front of the camshaft. This reversed its direction of spin, so we also swapped over 2 of the leads and now it works even though the numbers no longer match. I also remember some Australian Ford V8's circa 1975 that had a different camshaft that required a change of firing order - which was accomplished by simply swapping leads over.  Stepho  talk  11:56, 13 August 2018 (UTC)
thread_title:  Question regarding diagram 

message: The article says that some 4 stroke, 4 cylinder engines can have no distributor by using 2 coils and the Citroen ID19 is given as a an example. There is no explanation of how this works and I can't figure it out by myself - surely there must a switching mechanism for the 2 coils. Even searching the web for how the ID19 engine works didn't help - in fact I found a part for the ID19 distributor cap.  Stepho  talk  01:44, 15 December 2019 (UTC)
replies: text: Don't know where I've seen it described ( maybe here!) but if you put a spark plug at both ends of the coil, you can fire four plugs with only two coils. There's a "wasted" spark in the cylinder that's in its exhaust cycle, and I imagine the voltage requirements are high, but it does simplify the arrangement quite a lot. --Wtshymanski (talk) 06:30, 21 December 2019 (UTC)

text: Some Ford V4 engines did it too - maybe the Saab version? Andy Dingley (talk) 11:44, 21 December 2019 (UTC)

text: Wasted spark has pretty much disappeared now, because although it loses the distributor it still had external cabling, which was nearly as much trouble. So modern engines are almost all now using plug-top coil systems, with a single plug per coil  (my car has four cylinders and eight coils). The main difference is the electrical simplicity of the HT side and how that makes a more efficient load to be driven by the coil (and so the input power to the coil drops, which makes them far more reliable). The plug gap can be increased giving a better spark, and (mostly) a gap which is no longer a sensitive adjustment. As silicon power transistors are also cheap, the ECU's PCM driver has eight separate output stages, one for each coil.  There's no points or any sort of diistributor, as the timing signal is taken from the crankshaft, so even ignition timing is extremely simple and doesn't drift once set (I haven't adjusted the timing in 200,000 miles) because there's no mechanical wear path, such as a timing chain, in the timing path. I also get 75,000 miles life from the plugs, without intermediate adjustment and (thanks to unleaded fuel) no need for cleaning the plugs. Andy Dingley (talk) 22:20, 21 December 2019 (UTC)
replies: text: Sorry, I worded that badly. A lot of my cars are from the 1970's and early 1980's, so for me modern means anything with EFI. A lot of the early EFI cars used wasted spark because the ECU wasn't advanced enough to handle each cylinder separately and coil-on-plug technology wasn't quite there yet. I should have also mentioned that circa 2012-2017 I used to write software for ECU's for a company converting diesel engines to natural gas.  Stepho  talk  22:59, 21 December 2019 (UTC)
thread_title:  Citroen ID19 

message: Coils are generally passive devices not intended to receive power from coupling so
the "power" flow along the entire tract time averages to the same thing except
for various losses, 
"which need routine replacement due to wear, are also eliminated when the individual coils are mounted directly on top of each plug, since the power is transported a very short distance from the coil to the plug."
What is apparently meant is the high voltage, "... the high voltage exists only over ..." . It is interesting though to contemplate
as I had not thought about coil-on-plug much but it is extremely reliable
from what I've seen. On old CRT's, you always got dust around the high voltage
electrodes as the field gradient collected dirt. I'm not sure I ever
noticed that on plug wires but the high field time is brief. I thought all vehicles
now were coil-on-plug as those HV wires may as well go lol. The multiple coils 
eliminate a fatal failure mode and probably allow for better heat dissipation
and now curious if the total winding mass is lower. Since they have resistor plus
I'd imagine a few 100 ohms in the output winding wont matter.  — Preceding unsigned comment added by 24.99.151.159 (talk) 13:03, 1 January 2021 (UTC)
thread_title:  nit pick on wording,