WikiSysop: /* Look-up */

2025-08-12T18:11:20Z

Look-up

← Older revision		Revision as of 18:11, 12 August 2025
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	* Spark plug resistance: ohms		* Spark plug resistance: ohms
	* Spark plug gap: 0.8-0.9mm (0.031-0.035in)		* Spark plug gap: 0.8-0.9mm (0.031-0.035in)

			==See Also==
			[[Jane/Projects/MC_IC-Ignitor_Research]]

WikiSysop at 18:09, 12 August 2025

2025-08-12T18:09:56Z

← Older revision		Revision as of 18:09, 12 August 2025
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	~~Standin~~		==Timing==
			The engine speed is sampled directly from the crankshaft by two pickup coils placed at Cyls. No. 1&3 TDC and Cyls. No. 2&4 TDC. The two "pickups" are VR(Variable Reluctance) type, and together are referred to as the "Pulse Generator" in Honda literature of vintage. Each pickup is a coil of wire, wrapped around a steel core. One end of the steel core is exposed to the outside of the rubber moulded casing of the pickup, toward a sheet of steel attached to the crankshaft. The other side of the steel core is a magnet with the north pole pressed against the steel core and the south pole facing away from the entire assembly. Each pickup has a coil of wire with a resistance of 330ohm +/-10%.

			As the crankshaft turns the stamped steel bolted to it approaches, aligns with, then passes the steel core of each pickup. This induces reluctance, and a voltage dip and spike into the coil. At low RPM the crankshaft position is detected at a low frequency AND low voltage. The frequency is of course directly correlated to the engine speed, velocity, or RPM. The voltage is proportional, starting as low as tens of Volts up to hundreds of Volts at high engine RPM.

			From what I have read, using two sensors is very important to preventing the engine from running in reverse, as the controller can detect which pickup is triggered first.

			==Control==
			The Ignition Controller is a TCI(Transistor Controlled Ignition) type. It is referred to as the IC(Ignitor Controller) in Nippondenso and Honda vintage.
			# Condition VR signal input from the Pulse Generator
			# Calculate Engine velocity and position
			# Calculate ignition advance (see Advance table) from velocity
			# Calculate ignition offset from position and ignition advance
			# Trigger appropriate coil's charge duration (dwell?) and ignition event

			{\| class="wikitable"
			\|+ Advance Table
			!RPM
			!Degrees Advance
			\|-
			\|At idle min<sup>-1</sup>
			\|10 BTDC
			\|-
			\|Full advance/min<sup>-1</sup>
			\|32 BTDC/3000
			\|}

			{\| class="wikitable"
			\|+ CB650SC D-F(83-85) CDI Pinout (Module side)
			\|
			! colspan=3 \| Pulse gen/pickup coils plug
			\|
			! colspan=2 \| Ign. Coils Plug
			\| \|\|
			\|-
			\|
			! 3 !! 2 !! 1
			\|
			! 2 !! 1
			\| \|\|
			\|-
			\| 3-2 Pickup -> \|\| NP \|\| Y \|\| W \|\| + \|\| B/W \|\| L \|\| 4-1 Ignition coil \|\| 12v signal
			\|-
			\| 4-1 Pickup -> \|\| NP \|\| L \|\| W \|\| - \|\| Dg \|\| Y \|\| 3-2 Ignition coil \|\|
			\|-
			\|
			! 6 !! 5 !! 4
			\|
			! 4 !! 3
			\| colspan=2 \| Tees off to tachometer signal
			\|}

			==Look-up==
			* Ignition coil primary resistance: 2.8 ohms
			* Ignition coil secondary resistance: 13.6-15.5 ohms
			* " with spark plug cap: 21-28k ohms
			* Spark plug resistance: ohms
			* Spark plug gap: 0.8-0.9mm (0.031-0.035in)

WikiSysop: Created page with "Standin"

2025-08-12T18:07:32Z

Created page with "Standin"

New page

Standin

CB650SC/Ignition - Revision history

WikiSysop: /* Look-up */

WikiSysop at 18:09, 12 August 2025

WikiSysop: Created page with "Standin"