4ag + twin webers

[shakes]

this thread is here mostly because I suck at searching...

I remember a thread floating around somewhere with all info needed to set up the dizzy and the like. Next time I come across some money I'll be building a twin weber'd 4ag with large cam's and some basic work on it. It might of been on the old forums though

would like to slowly accumulate the part's needed so if anyone can either point me to some reading on it (again because I cant find it anywhere) or wants to impart me with knowledge on what size carbs, what parts to set up a dizzy with advance and somewhere I can match up cam's to suit that would be awesome.

Cheers

Simon

[Dylan]

These links may help out :



Im using PHH40 Mikuni Solex carbs from an 18rg on mine, with a Redline manifold
For the dizzy I had a distributor made by Performance Ignition. All they require is the old drive gear and they make the rest. Cost around $550 but i highly recommend them, a few people are running this setup on the forum

[shakes]

cheer's man!!! thats set me off to a flying start.

[Hen may possibly be a nut]

I looked into this a couple of years ago.

From memory it was all reasonably straight forward (buy carbs, buy manifold, make throttle linkage etc...) aside from the dizzy.

From memory the options I heard of were:
- 4K dizzy with 4AGE drive gear and adaptor to the head (vac and mechanical advance)
- stock dizzy with programmable electronics box
- stock dizzy with ignitor from some other car (locked timing = gay)
- pull the EDIS guts out of an old Ford Escort dizzy and fit them to 4AGE dizzy and use some aditional electronics

Hen

EDIT - just checked the above links and realised I was mainly repeating them...

[Golberg]

Its also possible to still use the factory computer to run ignition. Probably the cheapest way if you know how to wire.

[ke70dave]

or get a megasquirt ecu. cheap as if your handy with a soldering iron. or still quite cheap if you buy them pre made. the MS! unassembled kit is only $139US or so, about 240US assembled.

you can get MS2 which has mroe data points and more features standard, but for what your doing ms1 will be fine. you can setup "custom" rev limits then as well, soft and hard limits. the soft limit is quite funky actually.

and run it off a bigport/smallport dizzy or gze cas.

then you can get exactly the ignition timng you want, dizzy vacuum curves are never perfect, always have compromises.

i remember my mate had a rotor with an IDA carby on it, running the megasquirt for his ignition. he ran it like that for yonks before he converted to efi.

not quite sure if MS was mentioned in those links, being american sites it prolly was...oh well

[Skylar]

There is also a thing called megaspark. It's just a megasquirt but for some reason it does spark only. Maybe it's cheaper?

[shakes]

cheer's benny, have carbs from my datto days, have manifold, throttle is easy. just gotta find a cheap clapped out bigport so i can get it all running on the shed floor and then get it built and tuned.

The EDIS sounds interesting. almost worth going aftermarket EFI if i'm going to that much effort, but interesting none the less.


trickiest but is maching down the trigger wheel which I'm sure we could still sort out easy...

who wants to donate a super cheap big port so I can have a play?

[dr1ft-pig]

if you want to run fixed timing, the module u use i think is off a falcon... its a bosch item "BIM024" is the part number, has 4 pinouts

2 of them go to earth and power and the other 2 get plugged into the standard 4age dissy, i had a pic of this somewhere that blair sent me as i originally did the setup on his car, i think he pmd me the pics, i shall have a look for them

[shakes]

I'm either going to work out mech advance (cause vac advance sux with twin webers) or edis which i'm starting to lean towards in a big way.