wanted - dimensions of a gems rover v8 cam sprocket

[dnb]

Or one from a Bosch will do...

I am most interested in the distance from the centre to the mid point of the cam position sensor. A drawing would be excellent.

Thanks.

[spend]

What do you really want Dave, I've got both cam sprockets lying around (well in a box that I know where to put my hands on ) as well as several 'open' timing covers (the inters certainly have a cast 'blob' showing the cam centreline as well as the casting for the sensor) on shelves.

[dnb]

What I really want is the means to draw and make a cam trigger disc designed to use the intermediate cam cover drilled to take a short hall sensor in the standard position.

Sounds like you have all the bits to make this easy - I didn't want to take either of my v8s apart.

[spend]

Just to help the thought process is this for the TVR with the vernier sprocket as I guess the clearance to the cover is the most tricky ( the casting boss for the sensor retaining screw throws a spanner in the works IIRC). I'll have a look later & fetch the bits inside.

at least a geriatric dementia'd mother means I can have oily bits in the kitchen small mercies

[dnb]

Thanks

Yes, it's a vernier duplex pulley, so the clearance to the trigger disc is a parameter to be determined. My cam sensor is shorter than the standard one - I know it fits in the engine, but haven't estimated the depth the disc needs to sit at yet.

Next stop, individual cylinder fuel trims & ion sensing closed loop feedback on the ignition...

[spend]

I'll have to do that tomorrow on an engine block with the cam gear & Intermediate cover. I don't think the later cam gears get you anywhere since their cover is a lot shorter and the cam nose / dias / length totally different.. . Luckily Bernie wanted Cliffs old vernier replacing so I have no problem coating that in plasticine Its no sweat there are 3 blocks stood flywheel side down outside the front door whilst I engineer Pontiac silly fluid dampers onto serp pulleys & trigger wheels in spare moments ....

[dnb]

Sounds like fun.

I thought the early GEMS RRs used intermediate timing covers, but used the different cam with short nose. The radial distance from the cam centre to the sensor must be the same regardless of the cam. This is tricky for me to measure without taking the cover off, and I'm trying to avoid that given how many pieces the car is in at the moment!

[spend]

Don't know OTOMH BH, I have both GEM's & Bosch cams + sprockets + front covers (leftovers of lumps I've rescued blocks from) but don't recall either being anywhere as deep as inter versions. Water pumps are the same but the crank pulleys / belt etc are just so much closer to the block - hence the timing cover squash I guess. If you put me on the spot the only differences I can recall twixt Gems & Bosch variants was the trigger pattern in the cam area, the oil filter angle & the crank sensor at the flywheel end.