ive just finished removing the rats nest....and the nikki carb...for the dellorto is coming.and 1 question on this (12a engine)..all the stuff on the rats nest plugsa into a main line...and everything is unplugged xept 1 plug going into the back of the alternator...is this for anything...cos i really dont want to leave this massive bunch of wires and colored plastic bits in the car cos of 1 plug.....so what is it and what are my choices.do i cur or get .i need none of it


also, the vaccuum advance on the distributor, should i just plug the hoses..or can i remove the whole vaccum advance thing..silver cylnder shaped things on the distributor:L)
thanks Paul

 

oh man, did you use pratch's write-up? or just have at it. you dont just pull it all and plug. a few things have to be re-routed, especially the vaccum advance. i'll try and find a pic of my setup and show you.

 

It's not hard at all. You simply unplu all that stuff, but keep the alternator plugge in (of course). You need vacuum lines for the dizzy. I think the intake amnifold should have connections for that (mine does, but it's a Mikuni type). That's all. So now you drive the car awhile like that, with all those loose connectors. If everything works: take the loom out (the engine part that is ) and cut everything off except for the alternator and oil pressure sensor. Retape the left overs to a wiring loom. There you go. Done.
Now i might forget something here, the whole stuff is so easy I might not think of some details. But I think anybody should be able to figure this out.

 

ok , thanjks for the inp0ut...but , i need no vaccuum advance,..,.,.dellorto doesnt require it.....

so can i remove the vaccuum advance


cheers,

Paul

 

I don't want to sound stupid, but as far as I know vacuum advance is always needed? (well as long as you aren't going turbo, were you might need retard).
The vacuum advance has nothing to do with your carb, it's about the ignition. The higher the revs, the earlier the spark must be there, to cope with the fact that it takes time to burn fuel. Since the higher RPM's would otherwise mean that the fuel would be burned beyond TDC (or Wankel equivalent) and therefor not have time to fully burn the fuel.
So you DO need vac. lines to the dizzy!

 

nah, you don't need vaccuum advance. i haven't used that on my 81 for 3 years. and my REPU isn't using it either. BOTH use dellorto 48 DHLA but same goes with any carb on a rotary.

the distributor has centrifugal advance that will advance the motor just fine.

 

there is a difference between wath you "need" and what is "usefull"... Again, without vac. advance, the engine will run, but it's there for a reason, you know. Centrifugal advance isn't enough.
Also again: it doesn't really matter whcih carb you have, as carb and ignition are two different themes (although they of course influence eachother)
Since you don't use vac. advance since three years, it's obvious it works without, so if you prefer it that way, just fine. But I'd like to put a car like that on the dyno and see what happens in high rpm zones, as well as low rpm. And compare it to a stock ignition. At the same time, I'd like to see figures about fuel consumption and emissions.

 

go ahead and dyno all that rotary emotions and let all us know how it comes out.

racers (like I) get rid of vacuum advance, eliminate another point of failure. and with aftermarket carb there is not a good useful vacuum source to use, seeing that the stock manifold to carb plastic plate is not used.

advance is set using max centrifugal advance. rev it to 5k and set leading to 18, trailing to 10 and you're done. centrifugal advance really IS enough.

none of my rotaries need smog so that's not an issue.

MPG? what's that?

yes, i do agree vacuum advance was there for a reason. but what reason was that????

 

ok, and that cannister like thing on the passenger side right behind the shock...i removed that as well......doesnmt seem to be hurting much......


but, my vaccuum advance isnt plugged in.....car seems to run fine.....no problems.....so ..i can remove the two shiny cylindrical pieces attached to the dizzy then.....

oh ya, one other thing./.in my engine..i have 4 throttle like cables......1 obviously is the throttle, another is choke...and the 3rd is cruise.....so whats the 4th.....

one comes from a device right behind the drivers side shock tower.....and the other..which i think is cruise comes from the passenger side right up against the firewall....thanks for all the help, im just trying to clean up my engine bay

thanks,

Paul

 

I'm not sure how the Dellorto is set up, but I kept my charcoal cannister with my Weber set up. It adsorbs fuel vapor (which is a good thing).
Plus- I do not have the vacuum advance set up on my Dizzy either. There is another port on the manifold that is blanked off that could be used (??)

Anyway- I found this website has the original Racing Beat install manual for Dellorto's...Have FUN!

http://www.gruntled.com/Dellorto/Catalog.html

 

Ooops...wrong link. Here is the install procedures:

http://www.gruntled.com/Dellorto/12AInstructions.html

 

Ooops...wrong link. Here is the install procedures:

http://www.gruntled.com/Dellorto/12AInstructions.html

By the way Racing BEat is quoted saying this:

"NOTE: Distributor vacum advance is not used with this intake system."

 

well, ok then, no vac. advance...