HI there I know this has been discussed before, but most threads were old and the threads were never really updated with working results.

I am looking to build a high comp NA CA18DE motor, why? because i have built 400whp CA18/CA19DET's, we no longer have a race track in my country, so most of my driving in on windy roads and nowhere to really accelerate past 180kmph.. and i want do experiment with Carbs and NA tuning etc.. I have a CA18 registered in my car and changing engine numbers in my country is a pain in the ass to say the least..

So i am going to buy an extra head and port, polish and build the valve-train and carb setup, sort out the distributor issue and then buy some high comp custom pistons and do quick rebuild/refresh with the new pistons and head/carbs/distributor setup..

(not selling any of my turbo bits, so if it sucks, i can swap it all back easily - plus my turbo seals are gone and my manifold is leaking - so i need to replace these bits anyway sometimes very soon)

I have seen that people that have done this or started the swap have used a distributor in place of the Crank Angle Sensor, my questions is which one? Subaru? Mitsubishi? Nissan??

What is involved in swapping in a distributor instead of the Crank Angle Sensor? do you simply remove the rotor shaft that goes into the cam shaft from the CA18 Crank angle sensor and fit/weld it onto a distributor? In that case most any distributor should work?

I am also guessing that this will allow you to eliminate the AFM? and you would jsut use a MSD and coil for spark tuning??

I didnt want to bump other people threads that were from 2006, so i started this one to hopefully get some clear answers..

I have found a set of 4A-GE 20v Throttle Bodies for dirt cheap, but dont know of a cheap/easy way of eliminating the AFM without buying a haltech etc, and i've been down that road already and would get some giggles out of tuning with no ECU..

Ideas, comments and opiniosn welcomed, but i am going to do this :)

I always steer at this photo and wonder how he is running it with the CAS and no Air Flow Meter??

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cas fires stand alone spark only ecu
maf only needed for fuel injection
spark can run of cas(cam angle senser)
or crank trigger cas(crank angle senser)

If you can lay your hands on one, you'd be better off to try and find a 4 port head. It'll make you sidedraft to head manifold less complex.

Use a mitsubishi sigma dizzy, off a 2.6 astron motor these dizzys run retarted opposed to advanced so the opposite of most dizzys, so you get a gear made up for the dizzy to match the exhaust cam gear and run it off that with a bracket, eliminates any form of computer, just fire it up!

thanks guys,

@tommo73 - thanks, was thinking of getting a AEM or similar ignition control unit.. just didnt know how the AMF would come into play

@A14force - i have been trying since 2002 when i first got into ca's to source a 4 port CA head locally, it's seems we only got JDM 8 ports..

@TUF-110 - I think I may go this route, need to find the dizzy and have a look at it and the CAS

thanks guys and keep the advice coming :)

Have you managed to find a Twin Sidedraft Carburetor manifold? Very interested to hear (literally hear) how the engine goes. Good luck with it all, keep the updates coming.

iam using the 8 port head with the bottom section of the stock manifold with the butterflies, i will be taking the butterflies out and seal the holes up. Then I will get an aluminum flange cut to mate to the CA18 lower inlet flange and tap it with the bolts for the webber to bolt to.. I'll weld a bracket for the throttle and other bits to the lower manifold too..



this is a photo from the sites photo album...

my main concern now is space to fit a distributor where the CAS is as i only have about 4" between the cover and radiator, finding a ignition only management system for reasonable costs seems to be difficult so using the CAS seems out of it..