Honda / Acura K20a K24a Engine Forum banner
1 - 20 of 32 Posts

·
Premium Member
Joined
·
1,821 Posts
Discussion Starter · #1 ·
okay.. just to bring everyone up to speed you might want to read up on this here on one of my previous links to know or kinda get an understanding of where i am coming from

http://forums.clubrsx.com/showthread.php?t=258215


okay now with that out of the way let me try and explain the whole scenario from the start...


okay now lets start with the k20a3... heres a quote and a pic from hondata
The VTEC mechanism differ significantly between the K20A2 and A3 head. The K20A3 uses only two cam lobe profiles on the inlet.



the A3 has 2 inlet lobes and no exhaust lobes for vtec... okay with me so far.. no lets take a look at the k20a2


The K20A2 head uses three cams per pair of inlet valves on both the exhaust and inlet.


and heres a better look at the k20a2 cams



okay now here is where the dilemma and why i ask so many questions in the previous forum is to get this out of the blue... i actually have pictures now to help along with the visual aid and so forth... first lets take a look at the motor that i have here


it looks like a typical base k20a3 with the dual runner intake manifold and so forth.. upon closer inspection this is what you see



now if you also take a look on the side of the head it has the same PNA code found everywhere else on the motor



its a k20a that has dual intake runners and a grey valve cover which is kinda strange for it being a k20a... so now lets take a closer look.. someone once told me to look at the oil cap and if it say what oil to put in there.. like 5w-20 then its a us model motor but here is what the oil cap says


Now this is what has me baffled and really puzzled.. look at the lobes of this baby.. it has 3 intake lobes and none on the exhaust


now if you compare to what everyone else says and from what i found..here is a quick rundown

k20a3 has 2 intake cam lobes and 0 exhaust
k20a2 has 3 intake cam lobes and 3 exhaust
the k20 pictured above has 3 intake and 0 exhaust???

so now what does this classify the motor as?? i have been told this was a Euro Type R motor which is the equivilent of the K20a2 which does not look like it to me.. looks like a k20a2.5 or something which falls in between the A2 and the A3.... also the ecu has the code of PRC on the ecu... go figure.. help for anyone that can
 

·
Registered
Joined
·
414 Posts
Where'd you get that engine from man?

Seems like someone had a base rsx engine and maybe the k20a engine was missing some parts,so swapped over some parts.

Tell me this man,does the head have lost motion assembly springs on both the intake and exhaust side,or does it at least have the locations machined in the head for them on both sides?
 

·
Premium Member
Joined
·
1,821 Posts
Discussion Starter · #3 ·
well first off everything is complete. nothings missing.. i double checked everything with the other k20a2 motor i have... also a second thing to note is that there is no sign of the screws being tampered with... no scratch marks no nothing on the screws... everythings left untouched...trust me when i say that you can tell that no tool has touched those screws/bolts till i took them off... me and my fellow mechanics are 99% sure that the motor was never touched or opened or anything of that type... also this is not the only motor like this... if needed to be i could be 10 more of these things.. its not this was the only one the warehouse had...
 

·
Premium Member
Joined
·
7,171 Posts
nikos said:
that is a japanese k20a auto... In japan, all of the k20 motors are labeled k20a..basically like a base rsx.
so it is better than an A3 but not as good as an A2?

Could you take a picture of the intake ports? take the runners off and take a picture going down into teh valves...

Someting like this...


also where did you get the motor? Stateside, or are you overseas somewhere? and if you don't mind how much did you pay for it?
 

·
Premium Member
Joined
·
1,821 Posts
Discussion Starter · #7 ·
jon v said:
so it is better than an A3 but not as good as an A2?

Could you take a picture of the intake ports? take the runners off and take a picture going down into teh valves...

Someting like this...


also where did you get the motor? Stateside, or are you overseas somewhere? and if you don't mind how much did you pay for it?
i live in the states.. i work at a shop that orders motors all day long such as B-series and H-series and when we went to the warehouse they had a few of these K20's lying around so i picked one up.. got the complete swap with motor, 6-speed tranny, ecu, and wire harness for $2500
 

·
Premium Member
Joined
·
1,821 Posts
Discussion Starter · #8 ·
nikos said:
that is a japanese k20a auto... In japan, all of the k20 motors are labeled k20a..basically like a base rsx.
but the motor came with a 6 speed tranny already on it.. so does that mean this is a base 6speed???
 

·
Premium Member
Joined
·
7,171 Posts
xproductionz said:
but the motor came with a 6 speed tranny already on it.. so does that mean this is a base 6speed???
Does it have an LSD?

and is all of the writing on the motor in Japanese or English?
 

·
Premium Member
Joined
·
1,821 Posts
Discussion Starter · #10 ·
dont know about the lsd part...writing??. what writing.. everything on the motor is either stamped PNA or K20A and the serial number.. oh yea and also the black barcode like thing on the side of the block and the oil cap.. thats pretty much it
 

·
Premium Member
Joined
·
7,171 Posts
xproductionz said:
well.. if you look on the oil cap it says "HUILE". which in french means "OIL".. so thats what made me think its a euro motor
when you say "Euro", thats what made you think it may have been a Euro R motor? The Euro R motor I beleive is only available in Japan. It comes in the TSX chassis and is only a 2.0L motor. I'm not sure what the motor code is though...

But it has the true I-vtec (3 lobes per cam) and it also has a TSX style head with internals of the Type R nature. i wouldn't mind finding one of these heads to throw on my TSX block. I just wonder what the intake ports look like...
 

·
Premium Member
Joined
·
1,821 Posts
Discussion Starter · #14 ·
here is a closer look at some of the internal workings..

here is the intake cams and rockers


here is the exhaust cam and rockers


and here is a closer look at the code on the intake cam gear side
 

·
Registered
Joined
·
130 Posts
From the pictures, it does not look like a true i-VTEC head but an i-VTEC-E ish aka k20a3 (si/base rsx rate 160 hp)

A true I-vtec has 3 cam lobes on both the intake/exhaust cams.

Also you check for an lsd by looking through the differential (where the axels go in.)
~if you see a bar in there then it's just a normal open differntial
~if you can see straight through then it has an lsd
 

·
Premium Member
Joined
·
1,821 Posts
Discussion Starter · #16 ·
humping_dragon said:
From the pictures, it does not look like a true i-VTEC head but an i-VTEC-E ish aka k20a3 (si/base rsx rate 160 hp)

A true I-vtec has 3 cam lobes on both the intake/exhaust cams.

Also you check for an lsd by looking through the differential (where the axels go in.)
~if you see a bar in there then it's just a normal open differntial
~if you can see straight through then it has an lsd
thats what i been saying.. it looks like its better than a k20a3 but less than a k20a2.. becuase the k20a3 has only 2 intake lobes only on the intake side but this one has 3 intake lobes on the intake side... but has the same exhaust as the a3...
 

·
Banned
Joined
·
15,811 Posts
ok dude, mystery is solved

http://asia.vtec.net/Reviews/20CivicRev/

Apparently that is what you have is a motor of the Honda Civic 2.0 i-VTEC that is made and sold in Thailand. The gearbox is a 5 speed though.


The K20A used on this Civic's uses an intake-only VTEC implementation. K20As with intake-only VTEC are used by Honda on a variety of their models, CR-V, Stream and models like the JDM DC5 Integra iS and some Accords as well. These models are more rounded than the all-out hardcore performance models like the Type-Rs. For them outright performance will not be as important as a good power with good fuel economy or a strong mid-range power for e.g. At the moment, Honda has two versions of this intake-only VTEC implementation. One uses 3 rocker-camlobe pairs and the other 2 rocker-camlobe pairs, both on the intake side of course. In both versions, VTEC changes the engine between a 12V to a 16V configuration, i.e. between either 1 intake or 2 intake valves per cylinder by de-activating or activating one of the valves.

According to my conversations with the Honda R&D engineers, apparently the K20A on this Civic uses the 3 rocker-camlobe implementation. In this implementation, there are three rocker/cam-lobe pairs per cylinder for the intake side. The two rocker-arm/cam-lobe pairs on each extremity (i.e. left-most and right-most pairs) are the ones which connects to the intake valves. One of the cam lobes is flat and this 'de-activate' its intake valve during normal operation (so called 'VTEC-off' mode) where all three rocker arms works independently of each other. The other lobe works the remaining valve normally and as a result, the K20A works as if it's a 12V engine, i.e. 1 intake and 2 exhaust per cylinder. Running with only 1 intake valve active induces a swirl in the intake air-flow and helps to completely mix the air-fuel mixture. This improves the efficiency of its combustion which improves fuel economy. In addition, a 12V configuration also deliver good power in the lower rpms. After 4800rpm, VTEC engages and locks all three intake rocker arms together. Both intake valves now works according to the middle rocker/cam-lobe pair which has a higher lift and longer valve opening duration. The K20A now works as if it's a 16V engine but with a wilder, racier intake cam. This helps delivers more power in the higher rpms.
 

·
Premium Member
Joined
·
1,821 Posts
Discussion Starter · #18 ·
nikos said:
ok dude, mystery is solved

http://asia.vtec.net/Reviews/20CivicRev/

Apparently that is what you have is a motor of the Honda Civic 2.0 i-VTEC that is made and sold in Thailand. The gearbox is a 5 speed though.
nice find nikos... solved the 3 lobes on the intake part... but what gets me is this.. my motor is hydraulic power steering but there k20a is electric...the pictures they have used in the example are not the same of the manifold i have... hmm.. maybe different models perhaps.. but you think you could help me find specs on this thing compared to the other k20's?.. dang the one they tested was a fully automatic 5 speed.. no wonder the gear ratios where kinda low...
 

·
Premium Member
Joined
·
1,821 Posts
Discussion Starter · #20 ·
1 - 20 of 32 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top