After Market Ecu's And Crank Trigger Wheel Assemblies

[Chris Wilson]

I am going to run a Motec M800 on my new RB26 engine build, and over here in the UK someone has logged scatter of up to 10 crankshaft degrees from the stock CAS sensor. I was therefore considering using the CAS as just a cam position sensor, and using a crank trigger wheel for crank position, with a dedicated sensor. Have many here done that, and if so, are they willing to show how they designed the set up? I know Hugh Keir in the UK used the 18 OS Giken clutch to flywheel bolt heads as a 18 "tooth" trigger, but I think I prefer a front mounted assembly. Thanks.

[Johanz]

here's mine. custom made crank pulley with intergrated trigger wheel. using ABS(antilock-braking system) sensor as pickup sensor. no chance to snap post-installation pic. too tight in there. will post up a pic once i have the chance...

take note that at the time of snapping pic, the "missing tooth" has not been cut as the pulley has not been installed on engine... cant determine TDC yet...

now running smoothly.

hope it helps...

Edited September 12, 2007 by Johanz

[Chris Wilson]

here's mine. custom made crank pulley with intergrated trigger wheel. using ABS(antilock-braking system) sensor as pickup sensor. no chance to snap post-installation pic. too tight in there. will post up a pic once i have the chance...

take note that at the time of snapping pic, the "missing tooth" has not been cut as the pulley has not been installed on engine... cant determine TDC yet...

now running smoothly.

hope it helps...

Thanks for that, a nice bit of machining, but are you not concerned about running an in lijne 6 with no crank damper? Cheers.

[Johanz]

Chris, I'll worry about that when the engine fails.

here's another way of installing the trigger wheel.

Edited September 14, 2007 by Johanz

[T04GTR]

ok. in order to get a clean rpm signal with my autronic smc. i had to use a crank trigger. its a 3 tooth trigger. basicly 3 windows machined into the crank pully. with a 3 wire hall sensor. and works a treat. still using the factory cas for 1 cyl sync.

the sensor is mounted off the oil pump sump blots on a bracket. and the windows are about 20mm wide and 4mm deep.