Does anyone have an idea why Honda made the H22A1 injectors larger then the A4? Also, does anyone know conclusivly what the H22A1 units are rated at? Several sites list different rates:

http://www.robietherobot.com/s...e.htm (says 345cc)
http://www.accordinglydone.com/data/injectors.php (says 325cc)
http://go.mrgasket.com/pdf/dfi.pdf (page 14 says 325)
http://www.allmotorhonda.com/t...r.htm (says 345cc)

I have seen one place, I can't find the link currently, that said the A1 injectors were 375cc. I am just really curious about this & searched & I keep finding different results.

 

Should be 345cc

And the reason is that one series is saturated and the other are not. Can't recall which is which.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LudeFanatic &raquo;</TD></TR><TR><TD CLASS="quote">Should be 345cc

And the reason is that one series is saturated and the other are not. Can't recall which is which.</TD></TR></TABLE>

I know that one set is peak & hold & one is saturated, but flow rate shouldn't need to be adjusted for that should it?

 

From what I understand that is why the flow rate was adjusted.

 

H22a1 is peak and hold. Not sure why they went to saturated with the a4 considering peak and hold is supposed to have a faster response time.

 

A1/A = 345cc peak and hold
A4 = 290cc saturated

 

Thanks for the clarification Blake.

Do you happen to know why the adjusted the flow rate on them?

Honestly the different flow rates are not that much different (prolly not a huge difference anyway) but still curious.

Thanks

 

i honestly dont know. I mean they could have ran different fueling maps on the a/a1 ecu's then maybe they found out how to run a smaller injector and be just as efficient. I dunno, just a guess.

 

5gs run a bit more fuel pressure iirc.

345cc is pretty big, and you don't really want an injector any bigger than you need when you're thinking like an OEM and want to do all you can to ensure good drivability, emissions, etc.

 

so many injector threads this week,lol. I have no idea why honda switched to a 290. Thinking like a company: if you can get the same results with a less expensive product, why not. that's my best guess.

 

I agree, I was mainly wondering why start out so big since it seems excessive. I also wanted to clarify the flow rate since there is differing info out there on the web.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by A Blue Lude &raquo;</TD></TR><TR><TD CLASS="quote">5gs run a bit more fuel pressure iirc.
</TD></TR></TABLE>

Yep.