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Misc: Ignition Best Place for a Coil


Dave61

Well Known and Active Website User
VOC Member
Just finished timing up my Grosset Ignition which has now got me wondering where to site the coil.
Looks like there is plenty of room under the Mag Cover but I can`t see any neat way to mount it.
Any suggestions on where to put my coil,helpful or otherwise,gratefully received.
Cheers
Dave
 

stu spalding

Well Known and Active Website User
VOC Member
I put one of my twin lead coils on a bracket on the frame tie, F47, in the cut out under the fuel tank. There again I'm not sure how big the Grosset coil is. Food for thought. Cheers, Stu.
 

Oldhaven

Well Known and Active Website User
VOC Member
The above picture shows that it is possible to make a bracket that sneaks under the mag cowl gap using the case bolts. That install also uses the mag mounting stud, though depending on the individual machine, some finagling is required.

I don't think Bob Larmour is on the forum, but he came up with a clever bracket to hold a coil on the cylinder head. Depending on the coil mounting arrangement this might work and it makes for a short run for the plug wires . It could even be incorporated into the commonly used steering damper bracket. There aren't many places to hide a coil on our spare machines, as the D coil mount shows.

043 (Medium).JPG044 (Medium).JPG
 
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vibrac

Well Known and Active Website User
VOC Member
I stick my BTH coils on a bracket on the sidecar/crash at mount with a bolt through a rubber hose that just fits the hole and swells up as the bolt is tightened
 

Dave61

Well Known and Active Website User
VOC Member
The above picture shows that it is possible to make a bracket that sneaks under the mag cowl gap using the case bolts. That install also uses the mag mounting stud, though depending on the individual machine, some finagling is required.

I don't think Bob Larmour is on the forum, but he came up with a clever bracket to hold a coil on the cylinder head. Depending on the coil mounting arrangement this might work and it makes for a short run for the plug wires . It could even be incorporated into the commonly used steering damper bracket. There aren't many places to hide a coil on our spare machines, as the D coil mount shows.

View attachment 26539View attachment 26540
Hi Oldhaven,
I like what David posted that you'd done under the mag cowl, so I'll have a go at that.
Cheers
Dave
 

Oldhaven

Well Known and Active Website User
VOC Member
Here is a Norton dual points ignition under my Rapide cowl. This picture is from an earlier time using the same technique. The tabs leaving the cowl through the gap have to be ground down a bit, but those 2 big coils fit fine. I used SS strips for the brackets, and I could remove the entire coil, ballast resistor and condensor package as a unit in five minutes with tool kit tools to get at the points. It is hard to see the rear mount unless you magnify the picture, but it is fitted to a long nut/standoff (used elsewhere on the twins, I forget the part number, maybe G72), on the lower mag stud to allow the cowl edge to pass by the bracket.


 
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Dave61

Well Known and Active Website User
VOC Member
Here is a Norton dual points ignition under my Rapide cowl. This picture is from an earlier time using the same technique. The tabs leaving the cowl through the gap have to be ground down a bit, but those 2 big coils fit fine. I used SS strips for the brackets, and I could remove the entire coil, ballast resistor and condensor package as a unit in five minutes with tool kit tools to get at the points. It is hard to see the rear mount unless you magnify the picture, but it is fitted to a long nut/standoff (used elsewhere on the twins, I forget the part number, maybe G72), on the lower mag stud to allow the cowl edge to pass by the bracket.



Thanks for that Oldhaven,
It's only a small coil I need to find room for so I should be able to use a variation of what you've done no problem.
Really helpful.
Cheers
Dave
 
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Oldhaven

Well Known and Active Website User
VOC Member
One more option. If you are willing to either desecrate an original part, or buy a new Taylor, (not made in China), cowl from Vincent Spares, you can mount the coil directly to the cowl as this ignition user did. He is using a QD disconnect for the small wires so he can remove the cowl if he wants to.

cowl in.jpgcowl.jpg
 

Dave61

Well Known and Active Website User
VOC Member
One more option. If you are willing to either desecrate an original part, or buy a new Taylor, (not made in China), cowl from Vincent Spares, you can mount the coil directly to the cowl as this ignition user did. He is using a QD disconnect for the small wires so he can remove the cowl if he wants to.

View attachment 26548View attachment 26549
That wouldn`t be too bad Ron, my cowl is a new one so I wouldn`t be messing up an original part, I`ve not done anything to my Vinnie that can`t be undone & not modified any original parts.
Really useful ideas, just miffed I seemed to have had a lack of imagination coming up with an idea !
Cheers
Dave
 

bmetcalf

Well Known and Active Website User
VOC Member
Hi Bruce,
My mag cowl is an alloy one, but if I could use industrial strength glue on a couple of bolts it would work well as a heat sink for the coil.
Cheers
Dave
My studs are screwed into a strap with tapped holes to give more area for the epoxy to grip to. The same could apply to your approach.
 

vibrac

Well Known and Active Website User
VOC Member
All smart ideas but I just don't think the leading edge of a rain & crud storm is the best place for wiring and electronics however if you want it to look a bit standard and you don't go out if the forecast is wet it's acceptable. When function beats form however as in serious riding or racing high up is best.
I know it is possible to fit the standard BTH coils under the cowl with the supplied brackets as I saw it done on a new installation 2 weeks ago but it's a lot of firkeling about and is not an out of the box job
 

Dave61

Well Known and Active Website User
VOC Member
All smart ideas but I just don't think the leading edge of a rain & crud storm is the best place for wiring and electronics however if you want it to look a bit standard and you don't go out if the forecast is wet it's acceptable. When function beats form however as in serious riding or racing high up is best.
I know it is possible to fit the standard BTH coils under the cowl with the supplied brackets as I saw it done on a new installation 2 weeks ago but it's a lot of firkeling about and is not an out of the box job
Sound advice Tim,
The coil Francois supplies is pretty small and I`m going to put a shield or deflector to give some protection & if it fails I`ll have the recovery service to fall back on.
Cheers
Dave
 

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