okay, first off, i already search and found 2 different answer on these injector sizes. i just want to reverified them. are they 310cc or 345cc? this is for h22a JDM motors.

 

I'm sure this has been documented on this board. Here goes anyways and someone correct me if I'm wrong, but I believe it depends on what year the motor is.
93-96 motors(OBDI up to 96) are 345cc and 97 up Accord R and Prelude are 290cc. the 93-96 motors have to use resitor boxes as they are peak and hold. the 97-up do not, as they are saturated injectors.

 

okay thanks. just wanted to make sure they are 345cc. and yes the motor is from the 93-96 h22a that uses the resistor box.

 

yeah i had that same question so would putting those injectors in a h22a4 will be better?

 

I have a JDM h22a and i have no idea what year it is anyway to tell? A guy said it was a 96 and came outta an accord and was a red top, but who knows.

 

If you have the OEM ECU then stick with the OEM injectors. Also, their's no need to upgrade the injectors, untill you have some serious mods.

 

you cannot just add injectors. your a4 has 280 cc injectors which are a lot smaller than the 345cc's. so thinkin about it if your ecu says to run the injectors at 60% duty cycle and you add 345's you will be adding a crap ton of fuel your car doesnt need and choke it out.

if you want to add injectors you have to have some kind of tuning software.

 

Yeah, you will have no power gains from "just adding injectors". You should only upgrade injectors, when your performance mods necessitate it, and you have something to tune the bigger injctors.

 

If anything you would lose power. Running rich eats power alive!

 

Ok so its a 92 jdm H22a what injectors does it have?

 

345 cc

 

Yup, the JDM '96 H22A Motor has the 345cc injectors and thats the same year JDM H22 that I'm running.

 

345cc

 

I'm having a problem here..

All this while i'm using the lude 345cc injectors on my OBD1 H22. Recently, injector no.4 was broken. And i replaced it temporarily with the one from a CD6 accord H22.

I understand that Lude's is 345cc Peak n Hold, while Accord CD6? are they the same or different?

Prelude H22 - 345cc Peak n Hold
Accord H22 - ???cc Peak n Hold

So, what is the Accord's CD6 injector size?

 

Anybody could clarify this? as i could only found info for the Lude's injector but not the Accord CD6

 

so every one is saying the h22a obd1 uses the 345cc injectors and the obd2 uses 290, then what about the a1 through the a4 usdm?????

 

H22a4 is obd2a they are 290
Had my old ones tested
The euro r h22 is obd2 and is also 290
Obd1 h22s are 310 i thought and they had a resistor box

 

All UDSM/JDM 92-96 uses 345cc injectors while the 97-01 all uses 290cc.

 

I just bought an h22a1 with 550cc injectors and it's way too rich. Where can I buy some 345cc injectors?

 

345cc at 36psi is 310cc.
The obd2 injectors run about 54 psi which means they will flow at 310cc

 

Fuel injectors are typically rated at 43.5 psi fuel pressure unless otherwise noted. That being said, "OBD-1" ('93-96 H22A) peak-n-hold injectors are rated at 330cc. The "OBD-2" ('97-01 H22A) saturated injectors are rated at 290cc.

 

345cc Its in the FSM, I believe.

 

I am not aware of the injector size being stated anywhere in the factory service manual. I own both a '95 and a '97 Prelude service manual... both are Helms Inc. factory service manuals. I looked in the specifications/service limits and the fuel system/injector sections and found nothing about flow rates. If you know where to find the information within the service manual, please share. I have quoted a size based off of tested data from RC Engineering, TWM and default menus within engine management systems when selecting injector types.

This thread seems to be nit-picking the size by 10-15cc +/- without stating a tested pressure as I did. The pressure matters, because if the operating pressure is lower than that in which the injector was tested/rated at, the flow will be LOWER. Conversely, if you run the injector at a higher pressure than it was tested/rated at, the flow will be HIGHER.

Let's use the 330cc injector at 43 psi as an example. The factory service manual states that the stock fuel pressure regulator has an operational range of between 33 and 40 psi of fuel pressure.

330cc @ 33psi fuel pressure = 287cc
330cc @ 40psi fuel pressure = 316cc

So, this means that the factory service manual is stating that an injector size of roughly 290cc to 315cc would work just fine in a H22A1 engine... assuming the fuel pressure was kept @ 40psi.

Fuel mapping by the stock ECU will be another matter when we consider the differences between peak-and-hold injectors and saturated injectors... in addition to ohm resistance. This is another discussion all together.

 

Ok, maybe its not there then. My memory is fuzzy as to where I read it, I was certain I read it in an official capacity and didn't just read it on the 'net.


Could be totally wrong though.....
I have nothing substantial to refute your info at this point,so the thread will stand as is unless someone else has anything different to present.

 

Anyone with access to a 97-01 helms, can you see what regulated and unregulated fuel pressure is ?

I cant imgaine it being any different than an h22a1 fuel pump.