Gems cam wheel and sensor

[Vixpy1]

Right chaps, more techie stuff.

How does the later RR gems cam sprocket differ from the TVR one. I presume it has a flag for triggering the cam sensor, is it a straight fit onto the cam, anything else i should be wary of.

Also is the gems cam sensor a magnetic or optical sensor?

Many thanks chaps,

Charlie

[spend]

There are 2 different ones on the P38's sagem & bosch. They have slots cut out that sense cam phase thats all (just different shapes). There are lots of gotchas if you are planning to use a P38 front cover BTW, particularly limiting is having to use std cams and drive gear (no verniers / uprated chain or sprockets). Just a common a garden VR sensor is used (the hole or casting marks in int covers is bit of a giveaway).

[Vixpy1]

what about cutting the blanked cam sensor hole in the tvr cover and using the gems sprocket and sensor?

[GreenV8S]

You're looking at doing it properly, which is certainly the best approach if you can manage it. However, if you just want to get it working there's an easier approach. Simply cut off seven teeth from the dizzy; the remaining tooth gives you a signal that you can use to indicate the cam phase. This does require keeping the dizzy, which might not fit your plans, but it's a doddle to do and avoids a lot of work converting to a full GEMS sensor setup.

[Del 203]

Vixpy1 said:

what about cutting the blanked cam sensor hole in the tvr cover and using the gems sprocket and sensor?

Who's stolen Chaz's id ?????

[spend]

There is space in the TVR cover with the dizzy removed. As I advised dnb years ago, just cut out the blank in the cover to insert a sensor. The 'trigger wheel' just needs sticking on the front of your cam sprocket in place of the washer, space available depends on the cam gear you use (plasticine & dry assembly is your friend for depth & position of 'trigger'). The pattern you cut into it depends on the ecu you use, all you need is a 180deg differentiation for cam phase - the pretty patterns in P38's are just so that the wheel is balanced.