b16a into 5th gen civic

After my timing belt snapped I thought it might be a good time to get that motor swap done I've been planning.

I havent bought anything yet and I need to get my car moving again as soon and as cheap as possible with the exception of it not being another d16z6. My car is a 94 civic ex 2 door automatic, I want to change over to a standard but I can get a b series automatic tranny for free so I'm gonna stay automatic for the time being.

My questions are...

Which b16a will take the least effort to drop into a 94 civic?
Will I have to alter/change axles to use a tranny from a b21a1?
Will the b16a exaust manifold bolt into and line up with the stock exaust?

Which b16a will take the least effort to drop into a 94 civic?
since you have the automatic tranny the b16a1 and the b16a2 will take the least effort to drop in.

Will I have to alter/change axles to use a tranny from a b21a1?
what's a b21a1?

Will the b16a exaust manifold bolt into and line up with the stock exaust?
b series parts are not interchangeable with d series parts.

since you have the automatic tranny the b16a1 and the b16a2 will take the least effort to drop in.


what's a b21a1?


b series parts are not interchangeable with d series parts.
Stop speaking.

1. 92-95 B16A is the best for you, you don't want to use a OBD 0 B16A(1) because you'll have to change a few things (distributor, injectors, various sensors), and wind up spending the same anyway.
This guy has one he is selling (B series auto tranny), good guy too, it's from a 90-91 so the plugs maybe different.
http://www.hondaswap.com/forums/index.php?showtopic=39560&st=0&#entry367147

2. The B21A1 is the old Prelude motor right? Can't use it, not the same B family, plus it's probably a POS anyway. You can either source your own auto tranny, or get a B16A auto from an importer. IMO you'd be better off getting an auto GSR for a little more.

3. Yes it will bolt up, but if you have a model withbthe cat right off the motor, you are going to have a space about 1.5' between it and hte B pipe.

2. The B21A1 is the old Prelude motor right? Can't use it, not the same B family, plus it's probably a POS anyway. You can either source your own auto tranny, or get a B16A auto from an importer. IMO you'd be better off getting an auto GSR for a little more.

that is a b20a

B21a1 is an early '90 something Prelude motor

that is a b20a
Like I said, stop speaking, it's from the 90-91 Prelude Si.

isn't the b21a1 carbeurated? or is that the years before that one

Fuel injected y0!!! B20A3 had dual side drafts.

i see.. any idea what the code is for the carb'd lude? it's gotta be pre-87 right? my buddie's got one, it's crazy stuff :lol:

ES, and the B20A in Japan, A18A1 (carbed) in the US 87, also EK1, ES1, and EF1 depending on how far back you go.

b21a1 is from the 90-91 prelude si, it is fuel injected

If i get the tranny that was designed for the sir2 b16a I should have no axle problems, correct?

I read somewhere that I will have problems with using JDM injectors with my USDM ECU, is this correct? If so what is the best course of action for me to take?

All i gotta say is...

..stay the hell away from the prelude b-series

All i gotta say is...

..stay the hell away from the prelude b-series
Exactly. It is a FAR cry from the Civic/Sol/Teg B series motors, and don't let anyone tell you it's not. Yes it says B on it, but it is more the alcoholic, dysfunctional uncle of the family.

I was told that I need axles from an integra and a custom mount for the automatic tranny, is this true?

If you aren't changing from auto to manual, no you don't.

You still need axles though.