outtacontrolsol

I live in England and drive a JDM '91 CR-X 1.5x
For those of you that don't know, it is a non-VTEC 16 valve carburated D15.

I was curious if anybody had any knowledge on whether or not it would be feasible to swap a D16Z6 into the car and retain the carbs.

I am working the angle of swapping the carb manifold straight onto the motor along with the distributor and wiring the VTEC to either an RPM switch or a manual switch. I have looked into this and all I haved found are people swapping the ZC engine to carbs.

Thanks in advance.

civic_loner22

is the crx rhd??

outtacontrolsol

yes

hondamark35

VTEC works because the ECU can shift parameters for fuel and ignition on the fly when it effectively changes cam profiles.

to make this work properly with a carbed motor you would need to duplicate this function/adjust-ability. now i don't know much specifically about the original carb you're wanting to use, but i would imagine you would need a 3 circuit carb (idle, low speed, high speed) set up to add enough fuel at the VTEC crossover. i'm guessing expert/guru level carb tuning experience would be required. you may be able to compromise on the ignition timing and set it to work well in both low lift and VTEC conditions. i'm not really sure how much this changes so it may or may not work.

it really starts to make sense to have a non-VTEC D15 head ported and built to flow as well or better than the Z6 if you want to keep the carbs. that or convert to EFI. the third option you're asking about seems to be the most difficult and most complicated route. and i doubt the results are worth it.

outtacontrolsol

Its funny you mention the "3rd option" because it is the only one I have successfully seen accomplished. The distributor had be be custom-made and retrofitted for the setup to work. I had forgotten that VTEC was more than simply flipping to a high cam. Without an ECU to moniter fuel and ignition curves, it is going to be downright impossible to accomplish my goal within my budget and patience levels. Cars are cheap here, I'll just buy a CR-X SiR and save myself the hassle. I like getting 40mpg too much anyways. Thanks for advise.

Thread close/

civvy

Do better than that: Use the Z6 head with the Y7 valve gear!

I'm building a 1300cc (D13B2) Carb'ed.

It's just a case of mix n' matching OE parts.

Prelude 2.0L Carbs; Z6 head; Y7 Bisi Cam; Header etc.

It's basically a bike engine, rev it up!

Retain the Honda ethos!

Retain the economy!