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Sports Coil and Coil mounting
https://www.ausmini.com/forums/viewtopic.php?f=2&t=7929		 Page 1 of 2
Author:  snowie [ Wed Jun 08, 2005 6:20 pm ]
Post subject:  Sports Coil and Coil mounting
What do you guys think of sports coils? There are a lot going around on e-bay at the moment for around $50 and I was wondering if they are worth it? They do look sweet, a lot better then my tired old silver one.
Also Iv'e noticed on almost every single mini engine bay Iv'e seen the coil is mounted horizontal and on the cluch cover/housing. Mine's mounted vertical and in between the altenator and dizzy? is this normal, I do have the holes to mount the coil on the cluth housing, should I move it?
Author:  drmini in aust [ Wed Jun 08, 2005 7:10 pm ]
Post subject: 
Be careful buying sports coils- look on the bottom. If they are 12V no problem. If they say "use with resistor" you need to put a ballast resistor in series with it.

Mounting- Unlike most car makers, BMC/BL etc put them on the motor. Dumb idea, IMO.
Early Minis had it on the clutch housing, later ones were where yours is, UK Rover etc ones they hung it off one of the head studs.
They all get wet in heavy rain- that causes more ign probs than a wet dizzy does. :x

Mine is now mounted on the RH inner guard, where it doesn't get wet... :wink:
Author:  Spaceboy [ Wed Jun 08, 2005 7:21 pm ]
Post subject: 
i hadnt thought of that, good idea :)
Author:  Mike [ Wed Jun 08, 2005 7:29 pm ]
Post subject: 
If youre getting a coil get the Bosch GT40T - this is a more modern transformer design and in my experience is great. Though I think some people dislike the fact it uses some sort of a polymer filling, rather than oil.
Author:  drmini in aust [ Wed Jun 08, 2005 7:41 pm ]
Post subject: 
Mike wrote:
If youre getting a coil get the Bosch GT40T - this is a more modern transformer design and in my experience is great. Though I think some people dislike the fact it uses some sort of a polymer filling, rather than oil.

These are epoxy filled. :wink:
I've heard of some people having probs with them, but I ran one for years with a Pertronix ignitor instead of points (before I got the Pulsar dizzy).
I know some guys who race with them too.

:idea: If you want this coil type for use with a Pulsar dizzy, get the GT40RT, which is 1.5 ohm..

BTW.. the old GT40 and GR40R are still around, new.
Author:  Mick [ Wed Jun 08, 2005 8:29 pm ]
Post subject: 
I believe ( and I may be shot down, but I am always willing to learn) that the fact that a sports coil MAY be capable of delivering saaaaaaaaay, 15000 volts instead of 10000 volts is largely irrelevent.

I believe that voltage will rise in a coil much like pressure will rise in a pipe. Once the limit of the pipe is reached (lets say 10000 psi for instance) then the pipe will burst and the pressure will not rise anymore as the container has collapsed.

Same with a spark plug, once sufficient voltage is reached for the spark to "break over", current will pass through the coil, Ohm's law will come into effect and the voltage will collapse as the coil discharges.

The best use of higher rated devices is that they may last longer because of superior construction and insulate, or that you may run plug gaps that are a little wider than usual as the voltage is capable of reaching higher values to break over slightly larger gaps.
Turbo cars have a use for them as well as boost pressure rises, the spark will not as readily jump the gap. Essentially blowing out the spark.

But for a normal everyday use, the possibility of a longer service life may be the only gain, everything else is a waste of money IMHO.

Please correct me though as my humble knowlege of auto electrics may be flawed :oops:
Author:  drmini in aust [ Wed Jun 08, 2005 8:32 pm ]
Post subject: 
Probably right Mick, so.... why did the 850 etc have an LA12 coil and the Cooper & S an HA12??
:wink:
Author:  Mick [ Wed Jun 08, 2005 8:59 pm ]
Post subject: 
S engines did run at higher revs,
Impedance is a function of frequency as well, the higher the frequency the lower the resistance to ground. This would work a coil harder, producing more heat.

More heat? Higer compression?A competition environment in mind?
Author:  68matic [ Wed Jun 08, 2005 9:04 pm ]
Post subject: 
Snowie i say you should go back to the old chunky coils
dunno how these new sports coils relate with the old dissy etc
Author:  benjamin [ Wed Jun 08, 2005 9:19 pm ]
Post subject: 
i had a sports coil with my old 43d dissy and it worked a treat it was mounted on the clutch bit by the way. your probally better of getting a pulsar dissy cost me $40 with coil, leads and dissy and works better than the old sports coil and lucas dissy ever did :)
Author:  gafmo [ Wed Jun 08, 2005 10:35 pm ]
Post subject: 
I have been a long time user of Bosh GT40's 8)
Until I desided that the wifes daily drive required a new coil as well as lead and Plugs....Morris ran well for a While and then BUgger All :!: two week looking for the problem and $60 of a specialist to find the problem :twisted:
I I purchased a GT40R :twisted:
Author:  Stuwey [ Wed Jun 08, 2005 11:34 pm ]
Post subject:  .
Just make sure the coil isn't vibrating around too much. That sorta stuff kills 'em from thie inside out. Not cool. BTW, what on earth does IMHO mean?
Author:  willy [ Wed Jun 08, 2005 11:35 pm ]
Post subject: 
In My Humble Opinion.
Author:  Mike [ Thu Jun 09, 2005 5:03 am ]
Post subject: 
IIs more like In My Honest Opinion (but thats just my humble opinion).

The epoxy (thanks doc) coils are also supposed to stay cooler and be more resistant to moisture which increases their longevity and performance (atleast thats what the blurb says and thats what I wrote on ebay when selling my GT40T - I've got a Pulsar setup these days - though it aint doing me much good ATM as the car doesnt like me and broke its g'box).
Author:  drmini in aust [ Thu Jun 09, 2005 6:57 am ]
Post subject: 
Mike wrote:
IIs more like In My Honest Opinion (but thats just my humble opinion).

The epoxy (thanks doc) coils are also supposed to stay cooler and be more resistant to moisture which increases their longevity and performance (atleast thats what the blurb says and thats what I wrote on ebay when selling my GT40T - I've got a Pulsar setup these days - though it aint doing me much good ATM as the car doesnt like me and broke its g'box).

One design advantage of these new coils is that the HT (high tension) and LT connections are at opposite ends of the body, that's what makes them more resistant to moisture that causes spark flashover on the top of normal coils. :wink:
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