The V8 Owners Forum -

Hi again, I have looked through the forums but struggling to find an complete answer!
My RV8 project- blown with a 100bhp shot of nos, fed by a 4bbl atop is being built on a (as much as possible) budget as I will do all the work and fabrication myself- my simple question- bearing in mind I dont like spending money on stuff if I can help it (or it is very beneficial is):
Should I stay with my ancient dizzy (maybe get a new one) or upgrade to EDIS or MJ? (don't really know the difference between them).
Would there be much of a power increase (will keep revs below 6000 to be safe) or is the only benefit at really high revs?!?!
When I was doing my mini's a while ago we could ditch the points for an electronic unit- (possible fitment or any good with the RV8?!)

Thanks!

Just do it. Big fat reliable stable spark. Exactly what you need. Will start better, will run better will handle the NOS better.

So to go EDIS is it really just a case of- fit trigger wheel, control module & 2 coil packs? Also would I be able to wire in an Omex rev limiter with EDIS? (They only say about coil fitment)

ps is edis completely fixed timing?

No its not... it needs an ECU like megasquirt to control the timing.

here is a good guide based on the canems system which i think only does 4 cylinder but it is still relevant
http://www.canems.co.uk/pdf/ignition_manual.pdf

Rev limiting with EDIS is limited to retarding back to 10' btdc - you cannot command it to drop sparks.
Works fine on my chevy, I have a hard fuel cut if the retard doesn't catch it - which has never kicked in so far.

Not sure if MJ supports a rev limiter, MS does however. Personally I would get a MS, because you always have the option of upgrading to fuel control later - plus i suspect you will get wider support for MS.

Thanks guys, think I might just stick with a dizzy for the moment then as I am running carbs so have no need for splashing out on MS, means I have to go back to searching for a interim cover with dizzy hole tho!

2 more Q's...

Did Rover really design a whole new front cover when they went dizzyless or did they just plug the hole (ie meaning do the later serp covers have a blank which can be drilled/reamed out for a dizzy?)

and:

I havent stripped my distributor down yet but it will probably be well worn out- am I best replacing it with something like this or putting new springs etc in the old one?
http://cgi.ebay.co.uk/NEW-V8-3-9-Rover- ... dZViewItem

I would like a Mallory one or something flash but to be honest I just can't afford it!