Perhaps a stoopid Q re HRC igniter boxes

[mrdidlydingo]

Right my NC30 has a HRC Igniter box the type that sits between the loom and ECU

Does this also suit NC35 ?

[mrdidlydingo]

By ECU I of course mean CDI

[micpec]

If you mean real deal HRC boxes there is a hugh difference in the NC30 ones vs. NC35 ones (the shape and the connection is for example totally different). NC30 ones are a slim tiny box where as the NC35 CDI one is a lot bigger in size and does have a bigger connection plug.

[superlite]

If you mean real deal HRC boxes there is a hugh difference in the NC30 ones vs. NC35 ones (the shape and the connection is for example totally different). NC30 ones are a slim tiny box where as the NC35 CDI one is a lot bigger in size and does have a bigger connection plug.

different plugs regardless of whether it's HRC or another make.

[CMSMJ1]

This is "just" de restrictor box and I don't think they have the same connections between '30 and '35.

Some div on ebay will buy it mate....

[Neosophist]

Doesn' the NC30 have a TCI rather than a CDI, the NC24 does.

Transisterised ignition system.

Ignition systems have evolved over the years and been called many things: Solid State, Ignitors, Breakerless ,Pointless, Distributorless, etc... In outboards they're called "Powerpacks" or "Pulse packs". They go bad about every 5-10 years and also cost a boatload (excuse the pun). Yamaha calls this a "TCI" (Transistor Controlled Ignition) or "Ignitor" pack. In autos we call them "CDI" (Capacitive Discharge Ignition), ECU (Electronic ControlUnit), or DIS (Distributorless Ignition System). I will say TCI and CDI for simplicity but .....

top7.21 ["TCI" IS NOT "CDI"]


I Repeat ..."TCI" is Not "CDI"

The differences are subtle BUT you need to understand them or BAD things can happen


To be exact TCI uses transistor switches to disconnect the coils. This causes a charged coil to collapse and "fire" the spark. This is known as "Kettering" or "Induction" effect. So, in the VISION the coils are powered up all the time except while "collapsing" into spark. The VISION coils are constantly powered up at 12+ volts but the "induction" energy stored in the coils secondary core is about 20,000volts


TCI is an "INDUCTION" ignition system


CDI systems use a different technique. While the pickup and triggering is the same, the output from a CDI ignition module is a short high voltage pulse to the coil. In a CDI system the coil doesn't store the spark but instead AMPLIFIES the pulse from the CDI unit to a much higher level. The pulse is from the CDI module is normally about 250-500volts. The CDI coil acts like a transformer and steps the voltage even higher. A CDI coil typically steps up the voltage 100:1. Do the math and you see a modern CDI coil is outputing 25,000-50,000volts (Oh-Baby).The spark coils here are wired directly to ground and are waiting for the high voltage pulse from the CDI module.

"CDI CAN KILL" :That's why there are warning stickers all over your auto engine bay. The CDI module itself can give you a WICKED shock (not just the coil) and ...the coil output can KILL YOU.



CDI is a "CAPACITIVE DISCHARGE" system


.

top7.22 [CDI vs. TCI]

The higher output voltage of a CDI module produces a much higher cooresponding coil output voltage . So, CDI produces a much hotter cleaner spark. It is the ignition of choice among race teams and now widely used for everything. The "CD" in CDI means capacitive discharge. This refers to the high voltage output of the CDI module which comes from a "mini" coil circuit of its own. The downside to CDI is the short high voltage spark pulse duration. This is better at high RPM but makes starting difficult. You will notice many CDI ignition systems that use a starting "ballast resistor" type circuit. This circuit ups the spark output in the CDI ignition for starting only. TCI produces a longer spark duration (which some might argue is more reliable).


TCI collapses an already charged coil by disconnecting it (TCI switches off briefly). These systems generally use a higher resistance type coil and are known as an "induction" or "Kettering" ignition systems.

CDI sends a brief high (200+) voltage pulse to an uncharged coil which act like a transformer and multiplies it even higher. The step up is normally around 100:1. These systems tend to use low resistance or "racing" oils.

CDI modules normally use low resistance type coils. Remember that CDI is "shooting" a voltage pulse through the coil. TCI (or induction ignitions) use (and expect) higher resistance "induction" type coils. Remember current is flowing through the TCI to the induction coils continuously and the coil is fired when the TCI shuts it off. The importance of this is:

Do Not Use a "racing" -or- low resistance type coil in an "induction" ignition (or TCI) system.
The low resistance coil will flow more current thru the TCI and produce the legendary "Hot Toaster" effect. Though it will work for awhile, you will eventually burn the TCI module out.

All info taken from Here