What's the difference between the JDM B20A and the USDM B20A5? - Honda Prelude Forum
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Old 07-05-2002, 02:27 PM   #1 (permalink)
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What's the difference between the JDM B20A and the USDM B20A5?

Exactly as the topic suggests. Any and all answers will be appreciated! Thanks!
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Old 07-05-2002, 02:43 PM   #2 (permalink)
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Use the search option! This question has been asked over and over now.
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Old 07-05-2002, 02:57 PM   #3 (permalink)
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Quote:
Originally posted by Preyluder89
Use the search option! This question has been asked over and over now.
How true! The search function does list topics asking this exact question - over and over, yet not a one recieves a full answer.

I need more than engine specifications.
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Old 07-05-2002, 03:13 PM   #4 (permalink)
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Quote:
Originally posted by AgentPrelude
How true! The search function does list topics asking this exact question - over and over, yet not a one recieves a full answer.

I need more than engine specifications.
Fine, I'll spoonfeed you!! Here, I performed a SEARCH, and this was this first thing I can across. It covers peak hp @ specific rpm and peak torque, CR, etc. :
JDM b20a torque numbers...
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Old 07-05-2002, 03:19 PM   #5 (permalink)
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Let me restate what I said previously.

I need more than engine specifications.

I need answers to questions that can be found in this unanswered post.

JDM B20A Swap

I need possible differences between the USDM B20A5 and the JDM B20A, other than numbers. For example, are the manifolds and ECU's interchangeable, etc...

Thanks!
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Last edited by AgentPrelude; 07-05-2002 at 03:22 PM.
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Old 07-05-2002, 03:30 PM   #6 (permalink)
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Alright, I didn't know you wanted those kind of specifics. Without the Exhaust Gas Regulator, the motor cannot pass emmision, not even the US-spec B20A5. As far as I know, you can use the exhaust and intake manifold that comes on the B20A, and still pass emmisions. Iceman has the US tranny working w/ his J-spec B20A, and he hasn't had a problem yet. I remember hearing someone say the US ECU is compatible w/ the B20A, but I'm not sure on that one. I'll ask around. Sorry for the confusion.
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Old 07-05-2002, 03:38 PM   #7 (permalink)
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Out in good ol' Kansas, we don't have any emissions requirements that I'm aware of. I've never had to have one in the past three car's I've owned. Maybe it's just a large population thing, like So Cal or Dallas.

Thanks for your answeres they are very helpful.

I'll be ordering a JDM B20A next week to replace my B21A1. I'm guessing the B20A5 and the B21A1 share the same ECU so my current B21A1 ECU should be compatible with the JDM B20A engine. Furthermore, It's to my understanding that the manifolds for the B21A1 will work with the JDM B20A. Correct?

Thanks a million, again!
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Old 07-05-2002, 04:12 PM   #8 (permalink)
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yes, both manifolds will work. The ecu also works, along with the tranny. everything bolts up perfectly... i recommend changing the flywheel, distributor, timing belt, waterpump, plugs, wires, etc on the new engine. everything will interchange. let me know if you need any help with the install... i have done 3 engine swaps so far. if you b21a1 is running, i am interested in buying it. high mileage or not. i will be building a one-of-a-kind motor, and i need a spare b21a1 for parts. Let me know asap, i am looking to buy within 1 month.
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Old 07-05-2002, 04:39 PM   #9 (permalink)
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Iceman -

Sounds good. I'll be finding out Monday if I'm doing the swap or not. The timing belt went out on it and there might be valve damage, and if that's the case then I'll take the opportunity to have the swap done. I was quoted on having the valve job at 600-900, and I just don't think it is worth having it done on a B21A1 that will probably start burning oil like all the others.

As of 118,000 miles, it doesn't burn any oil, but it has ALWAYS ended up being a quart low when I have the oil changed every 2,500 - 3,000 miles.

But I'll definitely post the outcome Monday.

Where do you recommend the purchase of a JDM B20A engine, Iceman? Thanks.
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Old 07-05-2002, 09:03 PM   #10 (permalink)
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Quote:
Originally posted by iceman2001
... i recommend changing the flywheel, distributor, timing belt, waterpump, plugs, wires, etc on the new engine. everything will interchange......
What do you mean change them? from JDM to USDM? if so why?
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Old 07-05-2002, 09:27 PM   #11 (permalink)
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i recommend taking off all those parts from the b21a1 and put them on the b20a. The reason for this, is because you have no idea how worn down, or if those part even work that are coming with the b20a. The flywheel should be changed, because it makes your shifting more smoother if you have a usdm auto tranny. i recommend getting a NEW TIMING BELT and NEW WATER PUMP. all the others can be changed over.

I got my engine from a place called japan motors. i think the site is japanmotors.com or japanmotor.com - im not sure. very good people, the engine was in perfect condition. i will look for the phone number.

How much for your motor? I will buy if the price is right.
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Old 07-05-2002, 09:34 PM   #12 (permalink)
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Thanks for the reply again and the references, if you can find the number that would be great.

Does it matter what year JDM B20A I purchase? I've heard that the USDM 90-91 tranny's aren't interchangeable with the USDM 88-89 tranny's. I'm afraid there's a possibility that my Auto-SS from my '91 B21A1 transmission won't be compatabible with the JDM B20A motor.

Lemme talk with the mechanic when he looks at it Monday, I'm not even sure if I'll need the swap if the valves aren't bent. I'll let you know. See ya!
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Old 07-05-2002, 09:59 PM   #13 (permalink)
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Thanks for your infor Iceman. Neither http://www.japanmotors.com/ or http://www.japanmotor.com/ brings you anywhere to a company that sells JDM motors. So yeah, a site and number would be great.
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