Will a RWD SR20 distributor fit a FWD engine?

[Jon]

I seriously doubt the 50mm disc will fit in the SER dist... tolerances 
are pretty close. The picture of the RWD dist. looks like a completely 
different drive end from the SER unit. It looks like it was meant to be 
gear driven, where the SER unit is directly driven from the end of the 
cam. There is a roll pin, so you might be able to change ends, but my 
guess is the thing still won't fit. Probably cheapest/easiest answer is 
to get the VEMS disc, but I don't like the idea of 24 pulses (12 per 
crank revolution)... I think that isn't enough to get accurate timing. I 
would probably make a signal divider of some sort. Something like a PIC 
and a D flip-flop would work nice and you could divide the signal down 
to whatever you like. What is the max frequency the VEMS can handle? You 
could also talk to some folks who etch metal and see if they could make 
you a disc to do whatever you want.

Jon Davis

Ben Fenner wrote:
> I'm still working out the details of my engine management project. I've 
> been having trouble figuring out the cam/crank angle sensor problem. The 
> ECU can not handle 360 pulses per revolution that the stock CAS disc 
> creates. There is a solution. New disc are created with less holes.
> 
> Here is an example of a stock disc (mine):
> 
> http://www.supercars.net/gallery/132464/1497/645195.jpg
> 
> 
> Here is an example of the new style of disc:
> 
> http://www.vems.co.uk/VEMSTrigger/newdisk.jpg
> 
> 
> The problem is, these discs are available either through the VEMS crowd, 
> or AEM for RWD SR20DET distributors only. The RWD discs are 50mm, where 
> the FWD discs are 54mm. If I could fit a RWD distributor on my engine, 
> then I will have solved my problem. I'm askign if anyone knows if the 
> distributor from a RWD engine will fit mine, and if so, are there any 
> RWD distributors that still have a rotor and actual distributor, as all 
> the new RWD units I see are mearly a CAS, and that is it.
> 
> This is what I mean:
> 
> http://images.channeladvisor.com/Sell/SSProfiles/22001081/Images/2/NS37%20Overall.jpg 
> 
> 
> That will not work for me, as I still need to use my stock ignition. 
> So... Am I in luck? Will a RWD unit fit my FWD engine?
> 
> 
> -Ben Fenner
> 1994 Black SE-R (going VEMS, then turbo)
> 1994 Black SE-R (with sunroof)
> +----------------------------------------------------------------------+
> The mailing list home page is http://www.se-r-list.org/
> To modify your subscription, go to http://lists.deskmedia.com/se-r/
>