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tprelude · 09-17-2007, 03:08 PM

Hi, I'm a rookie when it comes to cars so I need some input.
I just bought a 90 Prelude SR with a B21A1 engine and one of the values has very little compression, which we have concluded from reading on the internet that it's the piston rings and possibly the value sleeves.
What I was thinking of doing is swaping the engine for a B20A5 (90 or 91) and was wondering if anyone has done this before or if the B20A5 will fit properly without any headaches? I was also wondering if there would be any modifications that would need to be done to the computer, wiring, etc because of this swap?

1Funryd · 09-26-2007, 03:15 PM

Quote:

Originally Posted by tprelude

Hi, I'm a rookie when it comes to cars so I need some input.
I just bought a 90 Prelude SR with a B21A1 engine and one of the values has very little compression, which we have concluded from reading on the internet that it's the piston rings and possibly the value sleeves.
What I was thinking of doing is swaping the engine for a B20A5 (90 or 91) and was wondering if anyone has done this before or if the B20A5 will fit properly without any headaches? I was also wondering if there would be any modifications that would need to be done to the computer, wiring, etc because of this swap?

Yes, just swap the B20A(JDM) or A5(USDM) motor only, use all the other things like Intake manifold and all sensors and flywheel from the B21A1.

Its a direct bolt on.

Sean

09-17-2007, 03:08 PM	#1
tprelude Junior Member Join Date: Sep 2007 Posts: 1 iTrader: 0 / 0% Rep Power: 0	Engine Swap from B21A1 to B20A5 Question Hi, I'm a rookie when it comes to cars so I need some input. I just bought a 90 Prelude SR with a B21A1 engine and one of the values has very little compression, which we have concluded from reading on the internet that it's the piston rings and possibly the value sleeves. What I was thinking of doing is swaping the engine for a B20A5 (90 or 91) and was wondering if anyone has done this before or if the B20A5 will fit properly without any headaches? I was also wondering if there would be any modifications that would need to be done to the computer, wiring, etc because of this swap?

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Engine Swap from B21A1 to B20A5 Question