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Old 16 Jan 2008, 03:32 am
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Default b20 with a b18b?

i have a stock 98 civic auto and my question is can i install a b20 long block with a b18b1 short block on a auto civic? i know u can do this with a manual but with an auto can i?? i will use this for my daily driver no racing i just want a little more juice under the pedal. plz help guys thanks
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Old 16 Jan 2008, 03:46 am
Join Date: Oct 2007
Posts: 37

the difference between a long and short block engine is just how complete it is. the biggest difference you will find between the auto or the manual is just if you have a fly wheel or a flex plate. so yes if you can do the stick, the automatic should not be a problem.
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Old 16 Jan 2008, 04:02 am
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Posts: 167

So I'm assuming you are wanting a B20 block with a B16B head attached? That will be an awesome motor, good peak HP from the civic Type-R head with good bottom end grunt from the B20!Like the above post, yes there will be little difference between manual and automatic, the only problem I could see is the ECU module. It would be best going to Hondata with your application and have them custom program a ECU for you. Also I know of a shop out in Cali that does these kinds of swaps quite regularly, and they are very helpful. Check em out at Hope this helps.
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Old 16 Jan 2008, 04:16 am
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well my answer for this is pretty similar to your first answer but the b20 and b18b ar the same size the trans axles and every thing bolts right up but the b20b makes 160 ft lb of torch so its a little beefyer so you might need a beater torch converter another thing to look in to is you might need a b20 ecu
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Old 16 Jan 2008, 04:31 am
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Join Date: Oct 2007
Posts: 246

You have your terminology messed up. A short block is the block without the head, the long block is the short block with the head. So I'm not sure if by short block, you really meant the head? But either way, the B20 is just a bored out B18B1 engine (i.e. 84mm vs 81mm pistons). They have the same crankshaft, same rods, and most of them have the same exact head.To answer your other question, yes you could swap in either engine into your car; as long as you have all the parts to do it. You'll need a new B-series transmission, because your stock one won't bolt up to the B20 or B18B1 engines. You will also need axles for an automatic B-series, a rear mount bracket fro ma B-series engine, a driver's side mount & bracket from a B-series engine, and an automatic ecu from a non-vtec B-series.
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