Header Fitment (F20B SOHC VTEC)

[Alex13mod]

What F Series Header will bolt on to this Motor with no problem? Very Similar to F22B1 on a 94-96 Accord (CD5)

[HondaFan81]

Can you remove heatshield off exhaust manifold and get a good shot of its flange/port spacing?

If it is same as F22b1/b2 then it is not compatible with F22ax/H23a1 headers. That's all I can say for now.

[Alex13mod]

I would if I was in the states, im in Kuwait. I'm ordering parts to put in my car when I get back home.

[HondaFan81]

I tried to find some exhaust port/exhaust manifold photos of this motor, no dice, spent like 15-20 minutes.

I did see many mention of it being similar to F22b1 SOHC VTEC. If that is the case, then you have the 0-00-0 exhaust port pattern and need a header for a 94-97 Accord 4 cyl application, F22b2 shares same port pattern.

Note, the intake manifolds have different port pattern than F22ax/H23ax as well, if you're buying anything related there. Again, do same vehicle application above.

[Alex13mod]

i'll be on my leave on Nov 20, so i'll see if I can take some picks and update you on this.

[deevergote]

I'm fairly certain that it's got the same head as the F22B1.
Of course, your F20B is the first one I've ever heard of... so I can't say for sure!

[Alex13mod]

If the head is the same, I know that the F22B1 Intake Manifold Bolts right on and Headgasket matches and rings. So 94-96 then would be the best choice for Headers and redo my piping the correct way with catalyst converter since NJ is being a Bitch with Inspection Sticker and Noise Polution.

[deevergote]

Yeah, if the intake manifold and head gasket are the same, then it's almost definite that the exhaust manifold is the same as well.

It's best to have a cat anyway. There are minimal gains to be had from eliminating it, and your car stinks, sounds terrible, and pollutes the air.

[HondaFan81]

From the photos, it does look like a F22b1 head or very similar design. It just seems you have a 2.0L block. I wouldn't doubt that's the setup, since Honda interchanges parts like this.

Your stock CR is 9.5:1, from my recent research. USDM F22b1 are 8.8:1. Also, I calculated that for 9.5:1 compression your piston CC is approx. -4.36 cc.

Based on the 1997cc engine displacement below and assumption you have a 85mm bore block (like F22bx), your stroke should be 88mm.

88mm stroke is present in the F20a SOHC non-VTEC. I believe Honda took that block and slapped a F22b1 SOHC VTEC head on it, both block and head share same 85mm bore, definitely doable. The pistons must be different than the USDM F22ax/bx and JDM F22B DOHC non-VTEC.

NOTE: Out of curiosity, I took the -4.36cc piston and put that into an F22ax block retaining the F20B SOHC VTEC head. You should get 10.2:1 compression!!

You can either take the F20B SOHC VTEC pistons and swap them onto an F22ax block or swap the F22ax crank & rods into your F20B SOHC VTEC block. I would do the first, as it would be easier to build, since the F22ax crank & block would match and have factory engraved information for engine bearing sizing reference.

However, I can understand your want for a 88mm stroke, if you want a more square engine build. You have the option of F22ax higher compression pistons for this build.

SPECS:

F20B SOHC 1997cc SOHC VTEC, 145ps(LEV)/148ps(4WD)/150ps


(1997 cc/ 4) / [pi * (8.5 cm/2)^2] = 8.8cm or 88mm stroke

[Alex13mod]

Thanks, i'll keep you guys updated on this build.

[Alex13mod]

Update: Its been a while since I updated this...The F22B1 Intake Manifold is a Direct Bolt on to the F20B SOHC VTEC. I wonder what other , Intake manifolds fit cause the F22B1 Intake Manifold is small compare to my F20B intake manifold.