Well here is the reality.
The port size is something I had expected to be larger due to the displacement being higher. It is much larger then expected though, the port is 1 X's as tall as ours but about 1.5 X's wider. Here is the comparison of the exhaust port size, it is nearly exact. A20 port 4/5ths the size of F22 ... I think I did the math right. The larger diameter tube will slow down velocity... if you make a good transition there souldn't be too much problems... you might want to make a new pipe in 1.625" (a little larger then stock) diameter from the A20 flange and then up the diameter to the F22 diameter.
- F22 Exhaust Port 100%
- A20 Exhaust Port 80%
The port spacing is pretty good in my opinion. especially for the two center ports. The outer ports will require a little more work on the pipe to get it to bend in enough to meet the A20 ports.
If using an A20 flange, the header tubes can be cut a few inches from the flange and removed or rotated 90 degrees and welded back on, there is no way around modiflying the ports shape because of issues with not enough material around the ports on the A20 flange. Other things you'll need is an A20 flange preferable in the same material as the header tubes. Once you cut the F22 flange, uless you plan to use some of it as a transistion to the A20 flange it's pretty much scrap. Overall this is very doable if you have a welder, hammer, and a torch.
Next step for me is to get a F22 header to work out fitment issues... and no I'd take my custom header over the F22 one anyday... this is for you guys if you want to take this route.
Accord 1997 F22 2.2 liter EX Accord --- Fel-Pro Header Gasket : MS 95535 --- $34.00
The actual number stamped on the gasket is : 94184
* Thank god it was a complete 1 piece gasket and not the 3 piece gasket set that the A20 comes with.
It says on the back that these are the same:
- F22B1
- F22B2
- F22B6
- Engine : 2.2l , 2156cc
- 1994 - 1997 Accord
- -
- F23A1
- F23A4
- F23A5
- Engine : 2.3l , 2254cc
- 1998 - 2002 Accord
This next image makes me very hopeful since it would allow me to use all of the F22 flange...
This is about as good as I can get it...
A20 Ports with F22 Ports turned 90* & circled in white, plus extra flange material added around the F22 port.
I have the scale image on my computer... it's very very close, but you may want to lay it over an actual A20 flange or head or gasket to double check the bolt hole allignment.
300 Pixles/Inch 12 x 3.76 Inches
Here is the shrunken image.
I think prior to cutting off the flange... use the flange as support to keep the oval shape of the F22 header tubes. Cut the flange inbetween the ports, first for the outer most ports... use a torch... hose clamps... a metal bar and start working the angle of the outer two tubes to get them alligned with cylinder port #1 & #4... then remove the flange and then finally cut the header tube to scrap or use later.
Next do the inner most ports. Remove flange material between them... allign them with #2 & #3 then cut the flange off, cut the pipe segments to scrap or use later
I you choose to rotate the pieces of tubes, it will first be fit to the flange and welded as starter tubes... any minor adjustments can be made to the primaries before finally rewelding all 4 tubes to the starter tubes on the flange.
Keep in mind the lower portion of the header... in order to allign with our exhaust you need the 15* tilt. ( 15* DOWN , in our case. ) You may be able to add the majority of the downward angle of the secondary tubes by unbending the tubes where they make the near 90* bend under the oil pan. So instead of having a secondary downpipe that bends 90* degrees... you bend it 75* degrees.
For those worried about port matching, The triangle cut could be used for regular header modification... since the port heights are the same we could triangle cut the header tubes and shrink them horizontally to form circles (_) instead of (__) ovals. It will give a nice transition from the A20 port diameter to the F22 header tube diameter... then with a little bending of the #1 and #4 tubes inwards all the ports should be alligned.
From (__)___(__)_(__)___(__) to (_)__(_)(_)__(_)
At least the oil pickup is on the same side... I have a feeling though that there will still be clearance issues.
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