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B20A Swap
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B20A Swap
Gonna put another B20A in my other lude. It's a 90 b21 engine but I need to know what connectors or components are OBD1 THAT I need to save.
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Re: B20A Swap
B21a1 to B20a5/A Swap - Write up - Honda Prelude Forum : Honda Prelude Forums
^^ this should get ya nice n confident.
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Re: B20A Swap
Most people who do this swap keep the b21 manifolds and just use the b20 block and head. There is no issue with the wiring/connectors using this method. The only real issue with this method is the b21 intake manifold runners don't align perfectly with the b20 head ports. You might be able to port match these, but you'll want to be careful doing that. It's easy to remove too much material and really mess up the air flow even more than it would be if you left it alone.
That's a decent write-up you posted Mike. I wish Sean would go in and remove the conflicting information in it though. It's a little confusing the way it's written IMO.
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1991 Prelude Si ALB 4WS 2017 Ram Rebel Last edited by luzer; 02-17-2015 at 11:54 AM. |
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Re: B20A Swap
That write up was pretty good. I noticed that it said to get a different water tube if you're going to manual. That's a little overboard. I just cut a few inches off with my saw zall and only took a minute and cost nothing.Gotta swap it cause after a week after changing oil it turns black plus it goes through a quart a week. Gas went down in price but oil hasn't caught up yet.
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Re: B20A Swap
Cutting the water pipe is a solution for that, but make sure you have a good hose clamp on there. Since you cut the pipe there's no longer a flare on the end. So in theory the hose could slip off the end of the pipe. Remember that the cooling system is under pressure at operating temps.
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1991 Prelude Si ALB 4WS 2017 Ram Rebel |
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Re: B20A Swap
I wonder if the intake gasket is the same? If not, I guess I'll use a b20.For some reason there was a mention of difference.
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Re: B20A Swap
Yes, there is a difference in the intake manifold gaskets between the b20 and the b21. In my first post I mentioned a difference in the b21 intake manifold runners and the intake ports on the b20 head. I'm not sure which gasket would work best for this.
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1991 Prelude Si ALB 4WS 2017 Ram Rebel Last edited by luzer; 02-17-2015 at 06:52 PM. |
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Re: B20A Swap
Maybe I'll go to the parts store and order both to see what the difference is.All I know is the b20 intake gasket will fit the head.
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