F20A2 carb head -> F20A4 PGM-FI

[CB3F20A2]

Hello everybody! I'm new here

So I have a 93' CB3 Accord EX and it has a F20A2 carb engine with 509tkm on it. I've been wondering if I could swap the carb head into a PGM-FI one from a F20A4. What's the main difference between these two heads and would it be just bolt on swap? I can get the whole engine + tranny + ecu + the engine harness for 200€. The F20A4 has like 480tkm on it so I though I'll just swap the head instead of swapping the whole thing. I know it's not lots of power but it's something

Btw sorry for my bad bad bad english

[deevergote]

To my knowledge, the heads themselves are identical. You should be able to swap on a PGM-FI intake manifold and injectors without removing the head (the camshaft is likely different... not sure, as we never got carbureted models in the US... I have no firsthand experience with anything but the F22A!)

The biggest issue is going to be converting the rest of the car to be compatible with fuel injection. I'm not certain, but I believe there will be a fair amount of wiring involved. You'll also likely need a new fuel pump, and possibly even different fuel lines (again, not certain... evil_demon_01 might be able to help better than I can here.) You'll also need an ECU from a fuel injected model, as well as the injector control unit.


Also, your English is fine. Better than most of the lazy Americans we have on here

[CB3F20A2]

To my knowledge, the heads themselves are identical. You should be able to swap on a PGM-FI intake manifold and injectors without removing the head (the camshaft is likely different... not sure, as we never got carbureted models in the US... I have no firsthand experience with anything but the F22A!)

Haha thanks man!

I've heard the inlet ports are differently shaped and there's a slight difference between the carb/PGM-FI inlet valve size. The camshaft is dirrefent IMO.

I'll take the fuel lines, tank and the fuel pump from the same car

[XCRN]

I actually believe the ports are the same. A lot of people buying my stuff do stinger races and one guy was telling me they all had to use carburetors for his class and he bought an F22A head and it bolted to it perfectly so the reverse would work physically as well. Your main issue is the wiring.

[CB3F20A2]

I actually believe the ports are the same. A lot of people buying my stuff do stinger races and one guy was telling me they all had to use carburetors for his class and he bought an F22A head and it bolted to it perfectly so the reverse would work physically as well. Your main issue is the wiring.

Hmm.. Could you list me the parts I need to get from the F20A4 to get the thing running. :| I'm a complete newbie with these things... I've been working on one engine swap (D15B2 -> D16Z5) on my brothers 4gen Civic, so I really don't have a clue how to swap a carburetor to an PGM-FI system. :|

Do I have to tear down my dashboard or do I have to change all the wirings? If so, I'd rather buy another CB with an PGM-FI

[XCRN]

I honestly would not know at all, I just know it bolts up. Only thing I would suggest would be an entire wire harness swap from under the dashboard and the engine bay with a fuel injected harness. Obviously the proper ECU, but beyond that I have no more information.

[evil_demon_01]

Is there something wrong with your current engine, or are you only doing it because of high km's?

The intake ports are different, The PGM head has cutouts for the injectors, where as the carb head are plain oval ports.

Valve sizes, camshaft and intake ports are different, Also IIRC the compression ratio was different yet the pistons were the same which suggests a different volume Combustion chamber.

Basically IMO the swap came down to it wasn't worth the effort to convert to PGMfi.

The Basics you need :
Engine wiring harness
Dash wiring harness
EFI fuel pump/tank with fuel return lines.
Injector unit
ECU
Exhaust manifold/downpipe with O2 sensors
Dash cluster

[CB3F20A2]

Thanks guys, I got the answer for my question: the swap ain't really worth the money and time. There's nothing really wrong with my current engine, I've just been wondering if I could swap the head to a PGM-FI one Maybe I can get the extra 20 hp out by doing something else...

[evil_demon_01]

Thanks guys, I got the answer for my question: the swap ain't really worth the money and time. There's nothing really wrong with my current engine, I've just been wondering if I could swap the head to a PGM-FI one Maybe I can get the extra 20 hp out by doing something else...

Don't underestimate the carb.
Sure the specific "Control" of EFI isn't there, but that doesn't mean all is lost.

Putting in a stage 2 camshaft will make a noticeable difference, Combine it with a rejetted carb (Or a Holley with custom adaptor plate) add an exhaust and you'll be over an extra 20 HP, and happy too.

Besides, there really is nothing quite like the sound of a Carb at full throttle

[CB3F20A2]

We'll be making a 2" exhaust with my pall next friday I've been looking for a better header but haven't really found anything that'll bolt right on.. Are there any "performance headers" out there for the F20-engine or do I have to buy a Prelude header and modify it or what :|

[evil_demon_01]

We'll be making a 2" exhaust with my pall next friday I've been looking for a better header but haven't really found anything that'll bolt right on.. Are there any "performance headers" out there for the F20-engine or do I have to buy a Prelude header and modify it or what :|

You can get a performance header for an F22, the exhaust ports/studs are the same as the F20.
Even the turbo DSM manifold fits . . .

[CB3F20A2]

You can get a performance header for an F22, the exhaust ports/studs are the same as the F20.
Even the turbo DSM manifold fits . . .

Great! I'll get my hands on one soon :3

[Accord problems]

CB3F20A2 any up dates on what you have decide to do with you're cb7 ?