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Old 12-16-2001, 03:10 PM   #1
xivera
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Forgive me, I'm stoopid...
What are the differences between a JDM angine and a USDM engine?
And, what's the deal with the RHD setup vs. LHD setup?
I'm toying with the idea of swapping a B20 into my Civic and a 4G3ET (turbo Eclipse) into my Mirage. Both of these engines have JDM counterparts.
Somebody break it down to me please...
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Old 12-16-2001, 03:22 PM   #2
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JDM motors:

More Horsepower (usually)
Different smog equipment
wiring harness and ecu are located on the other side of the engine compartment and interior

USDM

Less horsepower
Smog equipment is different
harness and ecu is on the drivers(LHD) side of the car

Someone help me make this list more complete please.
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Old 12-16-2001, 04:48 PM   #3
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Quote:
Originally posted by 91zc
JDM motors:

More Horsepower (usually)
Different smog equipment
wiring harness and ecu are located on the other side of the engine compartment and interior

USDM

Less horsepower
Smog equipment is different
harness and ecu is on the drivers(LHD) side of the car

Someone help me make this list more complete please.
I think thats about it 91zc?
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Old 12-16-2001, 07:43 PM   #4
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JDM spec engines can sometimes run more compression, some are unavailable in USDM vehicles e.g. B16A1, H22A powered Type S, while ECU's are generally calibrated for higher octane fuel.
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Old 12-16-2001, 09:03 PM   #5
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Quote:
Originally posted by 91zc

Smog equipment is different

Someone help me make this list more complete please.
different headers & exhausts

Quote:
Originally posted by Worshp
JDM spec engines can sometimes run more compression

higher compression ratio


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Old 12-16-2001, 09:05 PM   #6
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Quote:
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higher compression ratio
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Old 12-17-2001, 07:09 PM   #7
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Is that it!? Alright, thanx guys...
Is it safe to say that most JDM engines (+ trannies) have less mileage on them? I had read somewhere that they forfeit their cars earlier than us... or something...
Help!?
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Old 12-17-2001, 07:20 PM   #8
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Quote:
Originally posted by xivera
Is that it!? Alright, thanx guys...
Is it safe to say that most JDM engines (+ trannies) have less mileage on them? I had read somewhere that they forfeit their cars earlier than us... or something...
Help!?
i wouldn't take it as gospel, plus speedo's are, more often than not, wound back. Also, depending on the area the engine came from, the distance travelled may not be reflective of actual engine running time in traffic situations.
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Old 12-17-2001, 09:09 PM   #9
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Quote:
Originally posted by Worshp
i wouldn't take it as gospel, plus speedo's are, more often than not, wound back. Also, depending on the area the engine came from, the distance travelled may not be reflective of actual engine running time in traffic situations.
Cool... a little disheartening but, I can deal with that.
Thank you much!
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Old 12-17-2001, 09:47 PM   #10
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Quote:
Originally posted by xivera

Cool... a little disheartening but, I can deal with that.
Thank you much!
As long as you don't go buying an engine just based on milage, you'll be fine.

Like anything that you don't know the history of, it pays to do the health checks first
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Old 12-18-2001, 01:16 PM   #11
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Well the diffrence for example between a Prelude Type SH(USDM) motor and a Prelude Type S(JAP) is that the Type S motor has diffrent pistons and cams.
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Old 12-18-2001, 06:11 PM   #12
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Quote:
Originally posted by eightysix
Well the diffrence for example between a Prelude Type SH(USDM) motor and a Prelude Type S(JAP) is that the Type S motor has diffrent pistons and cams.

the whole valvetrain is different, not just cams.
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