reality on H22 engines

[beastfromeast]

Can someone, please, tell me what is the real difference between a U.S. h22 engine vs a japanese model. I have heard that injectors are bigger, or there is no rev limiter, one has top speed cut off the other one not... I'm confused. I want to buy one but I don't know the differences because everybody i asked always contradict each other and so whatever.......

Thanks in advance.

Peace y'all, Raph...

[praxis]

Japanese engines are less restictive than American versions. As far as I know, you will be better off with a Japanese version...unless you are planning on passing an emissions test.

[drift]

Originally posted by praxis
Japanese engines are less restictive than American versions. As far as I know, you will be better off with a Japanese version...unless you are planning on passing an emissions test.

another lie.

japanese motors have higher compression.

[beastfromeast]

so that's it, japanese engine only have higher compression?
do they have more hp or more torque?
is there another difference because it's about 800$ to 1000$ more expensive.

thanks again Drift and all the others who answer...

Peace y'all, Raph...

[SleeperTeg]

Drift throwing down the knowledge and puttin' the liars to bed once again.....

Keep up the good work, Drift.

IMO - Get the USDM engine and add hicomp pistons of your choice. Are you going FI?

[mellowboy]

Originally posted by drift



another lie.

japanese motors have higher compression.

I don't think thats true. For b16 its the same compression. I'm not sure about H22's but i know for sure that the SIR and USDM b16's have the same compression from what i read. So not ALL japanese motors have higher compression.

[Moppie]

Drift, as always is right.

The only diffrnce between a JDM and USDM H22 is compression. oh and the fact that it has to get shipped all the way from Japan, and becuase of the extra few hp, they are in higher demand. Hence the higher price.


The JDM and USDM B16a is a differnt story.

The 1st gen (160hp) JDM B16a like the one in my car which was never sold or made avliable in the US had a CR of 10.4:1.
The 2nd and 3rd gen JDM B16a made 170, but used differnt Cams, OBD I and OBD II ECU's and a CR of 10.6:1

The USDM B16a use's a differnt set of cams again, and a differnt ECU but useing either OBD I or OBD II depending on year. They do however have the same CR and hp as the 1st gen JDM B16a.

All the engines should meet US emissions laws. After all the current Japanese Laws are currently tougher than any of the US laws, and Japan has always been ahead of the US in this regard.
The only engines you might have any trouble with are the early B16a's which thanks to thier age might not meet the requirments. maybe. if your unlucky.

[mellowboy]

Originally posted by Moppie

The JDM and USDM B16a is a differnt story.

The 1st gen (160hp) JDM B16a like the one in my car which was never sold or made avliable in the US had a CR of 10.4:1.
They do however have the same CR and hp as the 1st gen JDM B16a.

Yeh what i meant was the first gen b16. I know the compression rates and HP are the same as the us specs.sir2 is a different story. My point was not ALL jdm engines are higher compression than the U.S. model.

[Moppie]

Originally posted by mellowboy


Yeh what i meant was the first gen b16. I know the compression rates and HP are the same as the us specs.sir2 is a different story. My point was not ALL jdm engines are higher compression than the U.S. model.

And my point was that the 1st gen B16a is not the same as the US version. It only shares a block, head and crank and rods.

[praxis]

no... more like :eshooter:

'again'? :what:

I don't believe that a JDM engine will pass US emissions. A JDM build up will have less restrictions than that of a US version. Do JDM ECU's communicate with all the same emmissions sensors as that of a US version?

And I think it's worth the 20 extra horses:

[drift]

Originally posted by mellowboy


Yeh what i meant was the first gen b16. I know the compression rates and HP are the same as the us specs.sir2 is a different story. My point was not ALL jdm engines are higher compression than the U.S. model.

actually it does in a way... the SiR I motor wasnt offered here in the states, so it cannot be a basis for comparison. as for the SiR II motor, the static compression ratios may be the same, but dynamic compression is different since the JDM SiR motor runs more advanced timing to produce 170hp, whilst the USDM B16A runs retarded timing that only produces 160hp.

[drift]

Originally posted by praxis
I don't believe that a JDM engine will pass US emissions. A JDM build up will have less restrictions than that of a US version. Do JDM ECU's communicate with all the same emmissions sensors as that of a US version?

And I think it's worth the 20 extra horses:

first off, most JDM motors will pass most states' emission requirements... only CARB states will it not. this is due to compression... the higher compression combined with lower octane fuel will create lean detonation, which will trigger the knock sensor and force the ecu to run more fuel in combination with timing retard. it's not a "degree of retard"... it's a set retard point that creates more hydrocarbons in the exhaust due to unburnt fuel.

JDM ECU's have all the same sensors as USDM ECU/motor combinations... it would be retarded to add/subtract sensors as it would require Honda to have different versions of wiring harnesses for just one assembly line... not very efficient. plus, JDM ECU's are plug and play, therefore debunking the thought that JDM motors have less sensors.

lastly for the "extra 20 horses", because of poorer grades of fuel here, the 20 "extra horses" will never be realised if used in America due to our low grade fuels. the "20 extra horses" come from more efficient combustion and optimised ignition timing... it's not borne of thin air.

[Moppie]

There you have it.

Drfit as always is right. In fact right about now he is your god! and you should all bow down and worship him. :smoker2:


Now, wheres that add to favorites button, this is one of those threads that could be very very usefull.

[mellowboy]

Originally posted by Moppie
There you have it.

Drfit as always is right. In fact right about now he is your god! and you should all bow down and worship him. :smoker2:


Now, wheres that add to favorites button, this is one of those threads that could be very very usefull.

Yeh i guess so . Oh well, on the bright side i've gain more knowledge :finger:

[super 96 accord]

The JDM has a speed limiter.

Oh, and the JDM has closer gear ratios also.