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Old Dec 26, 2005
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Different K20's

Well like i have been saying over and over again i have the dang k20a from a JDM type S... getting tired of defending what i have and so forth and yad yada.. so to recap heres a look at my engine code



as you can see its a k20a but it doesnt have the PRB code like the type R does .. it has a PNA...

now take a look inside the head



for those of you who can understand the pic.. there are 3 lobes on the intake side and 1 on the exhaust side... heres a closer look at the cams on the intake side of mine


people keep saying that it is the civic si which is bull cause the SI has 2 lobes on the intake and 1 on the exhaust.. heres a close look at what the intake came look like on the si



k... now thats out of the way.. bet you are thinking.. what gives.. there is no such thing as a jdm type s... well.. if i can find the japan site again i for sure can show you on there site that is shows a jdm type r and a jdm type s.. but this will have to do for now




if you read the IVTEC section.. look for my setup which is"3 intake and 1 exhaust"... then scroll all the way across to the left to see what type of motor it is.....
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Old Dec 26, 2005
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nice post...
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Old Dec 26, 2005
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umm good find?
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Old Dec 26, 2005
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NO its not JDM Type S















J/k
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Old Dec 27, 2005
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Yeah good find and good way to prove your point
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Old Dec 27, 2005
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u have the same TQ numbers as the Si but at 4k instead of 6k. nice....
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Old Dec 27, 2005
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"Odyssey" k20a @ 161tq - very good for # for 2.0L!
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Old Dec 27, 2005
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Soudnt the engine you have out of a JDM S have 3 intake lobes and 3 exhaust lobes? You have more of an economy head witout true VTEC.
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Old Dec 27, 2005
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so basically you might as well have got a k20a3 and had the same hp?
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Old Dec 27, 2005
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interesting.... why did you go with this motor?
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Old Dec 27, 2005
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^^^ I would think more hp more torque and probably responds better to mods
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Old Dec 27, 2005
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you ain't gotta lie Mike, we like even though you got a jdm k20a3. hahaha LOL j/k mane I know your telling the truth.
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Old Dec 27, 2005
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Originally Posted by DaddyFatSacks
Soudnt the engine you have out of a JDM S have 3 intake lobes and 3 exhaust lobes? You have more of an economy head witout true VTEC.
The JDM Type S, is our Base RSX. So, in short, no, he shouldn't have 3 on both sides.
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Old Dec 28, 2005
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Originally Posted by whitevic
The JDM Type S, is our Base RSX. So, in short, no, he shouldn't have 3 on both sides.
well power wise the jdm type s has same numbers as the the SI and the BASE.. but if you wanna get "technical" then they are 2 totally different motors... what i dont get though how is it that they put out the same numbers as the SI and BASE but yet the motor itself is entirely different.. 3 intake lobes and 1 exhaust... 11.5:1 compression.... yet the SI and BASE have 2 intake lobes and 1 exhaust and the compression is what like 10:1 or 9.5:1 or something like that???.. but yields same power... hmmm.. i'll get down and dirty with more info on that when i do the head swap
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Old Dec 28, 2005
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Originally Posted by Spoolin
so basically you might as well have got a k20a3 and had the same hp?
i could have but i wouldnt have that k20a jdm block... the block has a higher compression.. it has 11.5:1 versus the k20a3 10:1 or 9.5:1 or something like that
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Old Dec 28, 2005
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all Japanese motors don't have a number after the letter. Hence, all K20A-series motors are stamped "K20A". it does not mean you have a type R block, it does not mean you have 11.5:1 compression.

JDM Integra GSR engine block code is B18C. NOT B18C1. The JDM DC2 Integra Type R engine block code is also B18C. NOT B18C5.

because the B18C-GSR has the same code as the B18C-R does not make the GSR a Type R. Same goes with the JDM 160 ps type S motor having the same engine code as the JDM 220 ps type R motor.

In fact, if you look at the specs on the Honda Japan website, you will see that your compression is in fact, not 11.5:1, but 9.8:1 ... noted here

Originally Posted by DaddyFatSacks
Soudnt the engine you have out of a JDM S have 3 intake lobes and 3 exhaust lobes? You have more of an economy head witout true VTEC.
Some of you don't seem to understand that there is NO "BASE" RSX in Japan. The BASE model "Integra" (RSX) is called the Type S. The Japanese Integra Type S is NOT a special edition version of the Integra, but is their base/standard model. They only have Type S and Type R. USDM has Base and Type S.

Essentially, his motor is technically not a motor found in the US. it is the same as a normal base RSX K20A3, except it has 3 lobes on the intake cam. His block is most likely the same as a K20A3.

Last edited by aznboysrfr; Dec 28, 2005 at 01:26 AM.
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Old Dec 28, 2005
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Originally Posted by Kyle23
u have the same TQ numbers as the Si but at 4k instead of 6k. nice....
his motor having the same TQ at lower RPMs is due to the dual-runner plastic intake manifold
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Old Dec 28, 2005
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haha... i see someone found the japan site for me.. lol.. but what i dont get is that when the shop did the voulme test with the block before i put it in my car, they determined that the compression was somewhere between the 11 - 11.5 range
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Old Dec 28, 2005
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Originally Posted by xproductionz
haha... i see someone found the japan site for me.. lol.. but what i dont get is that when the shop did the voulme test with the block before i put it in my car, they determined that the compression was somewhere between the 11 - 11.5 range
do you still have the data?

who knows. If they did the compression tests before actually running the motor, it might've have been clogged with carbon ... perhaps the need to start the motor and blow it all out could've been good, if that wasn't already the case.

when I first started up my engine, it was clogged as ****. Took a solid 2-3 minutes of cranking to get it to start up ... first start up was HELLA slow too. You could hear the individual explosions, placed about 1/2 second apart for like 3-4 seconds before speeding up to a 1700 rpm cold-start idle. Not to mention the gunked up ****-smoke filled the entire shop full of nice white/gray smoke.

cliff notes: carbon build up = higher compression readings (which u should already know)

If you do a simple compression test, I'm sure you'll be able to tell by the numbers. I would like to do one on my motor myself.
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Old Dec 28, 2005
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Originally Posted by aznboysrfr
all Japanese motors don't have a number after the letter.
No one ever gets that, on clubrsx.com they told me i was wrong when i said that. Damn haters

Its good to know there are some people around with brains in there heads not rice.
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Old Dec 28, 2005
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if you want the japanese site the JDM integra Type-S here is the link

http://www.honda.co.jp/auto-lineup/integra/

you can rep me now or later hehehe
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Old Dec 29, 2005
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Originally Posted by aznboysrfr
do you still have the data?

who knows. If they did the compression tests before actually running the motor, it might've have been clogged with carbon ... perhaps the need to start the motor and blow it all out could've been good, if that wasn't already the case.

when I first started up my engine, it was clogged as ****. Took a solid 2-3 minutes of cranking to get it to start up ... first start up was HELLA slow too. You could hear the individual explosions, placed about 1/2 second apart for like 3-4 seconds before speeding up to a 1700 rpm cold-start idle. Not to mention the gunked up ****-smoke filled the entire shop full of nice white/gray smoke.

cliff notes: carbon build up = higher compression readings (which u should already know)

If you do a simple compression test, I'm sure you'll be able to tell by the numbers. I would like to do one on my motor myself.
they didnt do a compression test.. they did a volume test.. they took the head off and worked with just the block... im trying to sort through all my junk to see if i can find the volume #'s again
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Old Dec 29, 2005
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good find
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Old Dec 29, 2005
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Originally Posted by varner88
when i first saw this motor a year ago i was confused and wondered why it was a k20a but then i realized it was from the jdm type-s and yes the compression on them are 11.5 or very close to that they sell this motor on plan B for 2800 bux full swap with 6 speed tranny and everything that u.s type s has except 160hp instead of 200hp
the compression on the jdm type s is 9.8:1. read again.

there is no need for that high of compression on that motor
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Old Dec 29, 2005
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hmmm very interesting..
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Old Dec 29, 2005
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Originally Posted by varner88
when i first saw this motor a year ago i was confused and wondered why it was a k20a but then i realized it was from the jdm type-s and yes the compression on them are 11.5 or very close to that they sell this motor on plan B for 2800 bux full swap with 6 speed tranny and everything that u.s type s has except 160hp instead of 200hp
well well well.. look who it is..
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Old Dec 29, 2005
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Originally Posted by aznboysrfr
the compression on the jdm type s is 9.8:1. read again.

there is no need for that high of compression on that motor
thats the part i dont get... number wise... or factory wise it says its 9.8:1.. or whatever... but voulume tests on my motor says it to be high 11's... dont know if its mine or what.. but go figure
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Old Dec 30, 2005
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^ not sure what to tell you. It's not anywhere in the 11's as far as compression goes.

There's no way Honda would rate the K20A - JDM Type S at 160ps if the compression was 11.5:1 AND there is 3 lobe vtec on one of the cams.

11.5:1 would give a pretty decent bump in hp, as well as the 3 lobe. Honda would've rated it at 165-170hp if the compression was that high.

Frankly, I don't see why USDM Base RSX's are still rated at 160 HP since they don't have 3 lobe vtec on the intake ... as far as I know. They should be rated at 155 HP or so.
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Old Dec 30, 2005
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Originally Posted by aznboysrfr
Frankly, I don't see why USDM Base RSX's are still rated at 160 HP since they don't have 3 lobe vtec on the intake ... as far as I know. They should be rated at 155 HP or so.
funny you should say that, with the new HP rating system, they are 155 HP
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Old Dec 31, 2005
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Originally Posted by aznboysrfr
^ not sure what to tell you. It's not anywhere in the 11's as far as compression goes.

There's no way Honda would rate the K20A - JDM Type S at 160ps if the compression was 11.5:1 AND there is 3 lobe vtec on one of the cams.

11.5:1 would give a pretty decent bump in hp, as well as the 3 lobe. Honda would've rated it at 165-170hp if the compression was that high.

Frankly, I don't see why USDM Base RSX's are still rated at 160 HP since they don't have 3 lobe vtec on the intake ... as far as I know. They should be rated at 155 HP or so.
k.. check this out....

then explain this to me..

why is it that the base rsx and civic si have
9.8:1 compression
2 intake lobes and
1 exhaust lobe
puts out what about 160hp


then why is it that the jdm type s is
9.8:1 compression
has real vtec on the intake side of 3 intake lobes
1 exhaust lobe
and puts out the same hp of 160...

so the jdm type s has real vtec on the intake side yet has the same hp as the USDM... why waste all that money????
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