Unofficial Royal Enfield Community Forum
Royal Enfield Motorcycles => Bullet Iron Barrel => Topic started by: Mid Mod on March 23, 2021, 04:19:57 am
-
My bike has the Bosch blue coil installed and runs fine. The problem is that it's jammed in tight and the tool box is rubbing a hole in it on one side and it’s rubbing a hole in the battery on the other side.
What are my options?
-
It should be mounted in the clamp on the rear fender behind the frame tube. It should not be touching anything.
Has it been moved?
-
I think it’s too low in the clamp but the regulator and rectifier are above it and prevent it from being pushed up
-
The paint has worn through and the case is corroding.
-
Move it, you have an incipient failure and you'll be buying another $50 coil soon if you don't.
Paint it gloss black & mount it below the fuel tank on the frame, near the plug. The Bosch is (I believe) epoxy filled so it doesn't care about orientation. Practicality is the driver here, you can't allow vibration to eat into the coil body or spark lead. Short spark leads are good, a couple of wires to the coil are cheap.
-
How much space is available above the coil? You should be able to loosen the support clamp, then slide the coil up and inch or so, then retighten the clamp.
-
There should be space there for that coil to have room. That is its proper place in factory trim. The BB coil is known to fit in the stock location.
If not, something else has been moved to a wrong place that impinges on the coil.
-
I’m wondering if this is the stock location for the regulator and rectifier. This is looking under the saddle seat from the rear.
-
Yes, for easy access & cooling.
My red bike has them neatly attached vertically just behind the tool boxes. Very tidy, but tough to access.
-
I’ll try to push it up. It needs to move up just over an inch. If it doesn’t go I can flip it so the wires are at the bottom, that should allow it to be pushed up enough.
-
Well in reality you can fit them anywhere, the early BMW coils used to hairline crack the bikes ran terrible in the wet, l bought one once as a bike with unknown fault a magnifying glass and new coil soon cured the issue.
-
Yes, if you have to, you can re-locate the coil.
It is a good idea to have it somewhere where air can blow over it for cooling.
-
I'm not finding anything that tells me this isn't an oil-filled coil. IF IT IS, it won't like being upside down. The oil is an insulating as well as cooling medium, and the windings that were at the bottom covered up with oil will now be exposed. They will not be cooled and the insulation factor is reduced.
A "potted" coil (epoxy or other solid) doesn't care about orientation, but on the Summit speed part site most of the coils are oil filled, even the pricey ones. Check with Bosch before putting your $50 coil upside down.
-
12v Ignition Coil Moto Guzzi / Bosch# 00012 superseded # 9 220 081 083 ( this coil is claimed to be resin filled, 50KV )
-
Good to know about the oil covering the windings. I’ll see if it slides up. If not I’ll have to start digging in to things. I have to remove the starter solonoid too.
-
I'm not finding anything that tells me this isn't an oil-filled coil. IF IT IS, it won't like being upside down. The oil is an insulating as well as cooling medium, and the windings that were at the bottom covered up with oil will now be exposed. They will not be cooled and the insulation factor is reduced.
A "potted" coil (epoxy or other solid) doesn't care about orientation, but on the Summit speed part site most of the coils are oil filled, even the pricey ones. Check with Bosch before putting your $50 coil upside down.
Just curious: Why would an oil-filled coil be only partly filled?
I don't recall ever hearing warnings about never mounting coils upside down.
-
The air space is for expansion when the oil gets warm or hot, a solidly oil filled case would hydraulic the top off. There is no way to know exactly how much airspace exists inside without taking it apart. Normally on oil cooled apparatus the expansion space is engineered to keep the expected pressure values low enough to not challenge the seals under predicted conditions. The expectation is that they will be mounted near vertical, so the windings are low in the case so as to be kept covered. The oil is both insulator & cooling medium. A lack of oil reduces the winding/case insulating magnitudes and decreases cooling ability for the winding area exposed.
Potted (amazingly like tar...) or epoxy filled windings generally have larger cases to produce greater surface area for cooling, as the heat transfer is via conduction, not convection. Unlike conduction, convection physically allows warm fluid to move, carrying away heat. Potted windings are very vibration resistant as the wire within is entirely surrounded & supported, not just suspended in a can of oil. Both can work well in proper application.
-
These two look interesting for under $30. The 5.5 ohm wouldn't need a ballast resistor.
https://www.denniskirk.com/emgo/ignition-coil-24-72404.p2001764.prd/2001764.sku
https://www.denniskirk.com/emgo/12v-5-5ohm-ignition-coil-24-71522.p2001761.prd/2001761.sku
-
I do like that second one you have listed.