Single or Dual Carb
CRX586
03-12-2002, 03:46 AM
I'm still trying to figure out which engine I have... the serial reads D15B (no number after that). There is no mention of VTEC on the engine...
I know that its SOHC and 16v. How can I determine if its single or dual carb....
"the D15B came in both single and double carb'ed SOHC versions, the dual-carb version delivering as high as 105ps in the CRX 15X"
FROM http://asia.vtec.net/article/d15b/
Anyone know where this engine came from (car/country). Doesn't seem like they were sold in the US market, I could be wrong...
I know that its SOHC and 16v. How can I determine if its single or dual carb....
"the D15B came in both single and double carb'ed SOHC versions, the dual-carb version delivering as high as 105ps in the CRX 15X"
FROM http://asia.vtec.net/article/d15b/
Anyone know where this engine came from (car/country). Doesn't seem like they were sold in the US market, I could be wrong...
Setanta
03-12-2002, 06:25 AM
Look and see how many carburettors are on it :finger:
We got the D15B twin-carb here - it has twin keihin carbs on it (both single barrel carbs). It was rated at 98bhp down 7bhp on the JDM spec engine. The carbs will be facing back towards your firewall and there will be a black, oval airfilter box with them parallel to the firewall. Single cam engines had the air filter box on top I think (they did on our 3G Civics anyway). The civic also had a 4-2-1 exhaust and a different cam profile apparently.
We only got this engine in our Civics - our CRXs "only" had the ZC as it's engine.
Hope the info helps.
We got the D15B twin-carb here - it has twin keihin carbs on it (both single barrel carbs). It was rated at 98bhp down 7bhp on the JDM spec engine. The carbs will be facing back towards your firewall and there will be a black, oval airfilter box with them parallel to the firewall. Single cam engines had the air filter box on top I think (they did on our 3G Civics anyway). The civic also had a 4-2-1 exhaust and a different cam profile apparently.
We only got this engine in our Civics - our CRXs "only" had the ZC as it's engine.
Hope the info helps.
Moppie
03-12-2002, 06:52 AM
CRX586 What you've found is the specs for the JDM 15x CRX, or the almost base model 2g CRX.
If whats printed under your name is correct you have a USDM CRX Si, in which case its not carberated, but Fuel Injected. ;)
If whats printed under your name is correct you have a USDM CRX Si, in which case its not carberated, but Fuel Injected. ;)
CRX586
03-12-2002, 06:03 PM
Ok... for now my profile has been updated since I don't really know what engine I have... the car is originally an HF - put in a SI engine a few years ago, or at least that's what I thought they did, but apparently not! I've learned a lot since then... :D
So I'm running an ECU from an US SI on my D15B with who-knows what tranny. CRAP. Just get me a b16a already.
I'll check the carbs when I get home (out of curiousity).
So I'm running an ECU from an US SI on my D15B with who-knows what tranny. CRAP. Just get me a b16a already.
I'll check the carbs when I get home (out of curiousity).
Moppie
03-12-2002, 07:16 PM
Well as far as I know there was no Carberated 2g CRX sold in the US.
(maybe a base base model??)
And if you have an Si engine then its deffinitly not Carb'd.
And If your running an ECU, then its most deffintly not Carberated. :D
(altough the Carb'd cars did run a small ECU for ignition advance (dont ask why)
What you should be looking for is the injection set up. Find if its multi point, or Programed Fuel injection.
Easy to tell, as it should be printed on the inlet manifold.
OR just look for the Fuel injectors, the P-FMI has 4 and the Mulitpoint only has 2.
Also take a look at the frount of your engine. On the left hand side right where the g/box bolts up is a small flat area. Clean any crap of it, and staring you in the face will be the engine code.
It should read D16y something.
(maybe a base base model??)
And if you have an Si engine then its deffinitly not Carb'd.
And If your running an ECU, then its most deffintly not Carberated. :D
(altough the Carb'd cars did run a small ECU for ignition advance (dont ask why)
What you should be looking for is the injection set up. Find if its multi point, or Programed Fuel injection.
Easy to tell, as it should be printed on the inlet manifold.
OR just look for the Fuel injectors, the P-FMI has 4 and the Mulitpoint only has 2.
Also take a look at the frount of your engine. On the left hand side right where the g/box bolts up is a small flat area. Clean any crap of it, and staring you in the face will be the engine code.
It should read D16y something.
EF6_CR-X
03-13-2002, 06:46 AM
Originally posted by Moppie
And if you have an Si engine then its deffinitly not Carb'd.
And If your running an ECU, then its most deffintly not Carberated. :D
(altough the Carb'd cars did run a small ECU for ignition advance (dont ask why
My Dual Carb CRX is wired up like a christmas tree, it sure has an ECU. The whole thing is 'dynamic' it has an oxygen sensor, EACV, and auto mixture control, and a whole heap of other sensors and too many vacum lines to count, the carbs are soo friggen complicated, it may as well be injected really.
But in saying that, if you pull the ECU fuse out it still goes:)
The ECU is basically for emissions control.
And if you have an Si engine then its deffinitly not Carb'd.
And If your running an ECU, then its most deffintly not Carberated. :D
(altough the Carb'd cars did run a small ECU for ignition advance (dont ask why
My Dual Carb CRX is wired up like a christmas tree, it sure has an ECU. The whole thing is 'dynamic' it has an oxygen sensor, EACV, and auto mixture control, and a whole heap of other sensors and too many vacum lines to count, the carbs are soo friggen complicated, it may as well be injected really.
But in saying that, if you pull the ECU fuse out it still goes:)
The ECU is basically for emissions control.
EF6_CR-X
03-13-2002, 07:32 AM
To be honest I don't see why someone would go to the effort of importing the dual carb D15B engine as it has very similar performance specs as the US Si.
Here is a pic of my engine bay in my CRX
http://files.automotiveforums.com/uploads/345490enginebay.jpg
Here is a pic of my engine bay in my CRX
http://files.automotiveforums.com/uploads/345490enginebay.jpg
Setanta
03-13-2002, 07:45 AM
I don't think anyone was suggesting it :)
I miss the twin-carb though - the car was fun... but it was going to get ZC'd anyway :) Now I don't care one way or another :)
I miss the twin-carb though - the car was fun... but it was going to get ZC'd anyway :) Now I don't care one way or another :)
SkyNex721
03-13-2002, 07:46 AM
Originally posted by Moppie
Well as far as I know there was no Carberated 2g CRX sold in the US.
(maybe a base base model??)
OR just look for the Fuel injectors, the P-FMI has 4 and the Mulitpoint only has 2.
There were no carberated 2g CRX's in the US.
Si - MPFI
Dx -DPFI
Hf - MPFI
All of them were Programmed Fuel Injection
Multiport had 4 injectors and the Dualport had 2 injectors.
Well as far as I know there was no Carberated 2g CRX sold in the US.
(maybe a base base model??)
OR just look for the Fuel injectors, the P-FMI has 4 and the Mulitpoint only has 2.
There were no carberated 2g CRX's in the US.
Si - MPFI
Dx -DPFI
Hf - MPFI
All of them were Programmed Fuel Injection
Multiport had 4 injectors and the Dualport had 2 injectors.
Moppie
03-14-2002, 12:35 AM
Originally posted by EF6_CR-X
My Dual Carb CRX is wired up like a christmas tree, it sure has an ECU. The whole thing is 'dynamic' it has an oxygen sensor, EACV, and auto mixture control, and a whole heap of other sensors and too many vacum lines to count, the carbs are soo friggen complicated, it may as well be injected really.
But in saying that, if you pull the ECU fuse out it still goes:)
The ECU is basically for emissions control.
Its just like an Alfa im putting back together at work at the moment.
It has an ECU, but it dosnt do much. Mostly just runs the timing advance, and some environmental fuel controls.
If you trace most of those vacum lines very few of them actualy go any where. They tend to be things like idle speed step up controlers, and cold idle controlers, etc etc etc. All of which are run of engine temp, and vacum pressure. And have no input from the ECU. :cool:
But your right about it being complicated, Iv pulled the head off an 88 prelude, which is far worse. It took as long to reconnect all the vacum lines as it did to bolt the head back down, and bolt the carbs and exhaust back on. (forunatly most are moulded into a spefic shape and lenght, so have limited placed they can go)
My Dual Carb CRX is wired up like a christmas tree, it sure has an ECU. The whole thing is 'dynamic' it has an oxygen sensor, EACV, and auto mixture control, and a whole heap of other sensors and too many vacum lines to count, the carbs are soo friggen complicated, it may as well be injected really.
But in saying that, if you pull the ECU fuse out it still goes:)
The ECU is basically for emissions control.
Its just like an Alfa im putting back together at work at the moment.
It has an ECU, but it dosnt do much. Mostly just runs the timing advance, and some environmental fuel controls.
If you trace most of those vacum lines very few of them actualy go any where. They tend to be things like idle speed step up controlers, and cold idle controlers, etc etc etc. All of which are run of engine temp, and vacum pressure. And have no input from the ECU. :cool:
But your right about it being complicated, Iv pulled the head off an 88 prelude, which is far worse. It took as long to reconnect all the vacum lines as it did to bolt the head back down, and bolt the carbs and exhaust back on. (forunatly most are moulded into a spefic shape and lenght, so have limited placed they can go)
Setanta
03-14-2002, 01:20 AM
looks like we got a simplified version - but it was the approx 100bhp version. No ECU, little in the way of wiring and the engine bay wasn't as cluttered as the CRX in that pic. Then again - ours wasn't JDM - it was built in Japan for the Aussie market :)
CRX586
03-15-2002, 02:17 PM
CRX586
03-15-2002, 02:21 PM
1. The car is originally an HF, which means is had MPFI (still there). I did the swap about 2 years ago thinking that I was getting a US Si engine.
2. The engine code reads D15B. No number after that.
3. I switched out the original ECU for one from an SI. This moved the redline up and might have improved acceleration.
I just want to know what the stats are for this engine. Is it possible to have a non-carb D15B? Did any US cars come with this engine??
Thanks for the help! :D
2. The engine code reads D15B. No number after that.
3. I switched out the original ECU for one from an SI. This moved the redline up and might have improved acceleration.
I just want to know what the stats are for this engine. Is it possible to have a non-carb D15B? Did any US cars come with this engine??
Thanks for the help! :D
CRX586
03-15-2002, 07:12 PM
Damn, why aren't those photos showing up??? :confused:
CRX586
03-15-2002, 07:14 PM
Setanta
03-17-2002, 06:02 AM
Originally posted by CRX586
Damn, why aren't those photos showing up??? :confused:
Geoshitties doesn't let you link pics - that's why :)
Damn, why aren't those photos showing up??? :confused:
Geoshitties doesn't let you link pics - that's why :)
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