imho, it really depends on what you want to do with your car. if you want to go all out, then ditch the OEM carb and go for aftermarket ones (like webber, solex, mikuni or keihins). but if you only after aesthetics and psychosomatic power gains, you can try to retrofit an aftermarket tube intake and filter. it may not give you as much power as changing the carbs, but it sounds nice everytime you step on the accelerator. something like, "fwooooook...fwoooooook...fwoooooook". hehehehehe!
we've been able to retrofit aftermarket tube filters back here in the PI so it shouldn't be a problem for you guys over there. and if you got the parts from here, the whole thing would have cost you less than US$35.
4A-F never came with the gen 2 head.... doesnt really matter that much, the gen 2 head still has equal flow, just get the EFi from the old 4A-F and do some customizing, unless you want to go aftermarket carb route.
I believe it's a 7AFE head although I am going to confirm with him. I've had a couple emails with him about this head and he says it's from a 4afe engine.. but let me go over it again.
This is an email I sent Bill about this..
And this email details his reply to me.
Hi Steve,
>Ok, I've been reading that page from your site and all I can say is
WOW..
>You opened my eyes to a new shade of gray for my 4AF! The question is,
>what engine did you get this head from, a 7afe? I see you talk of one
7afe
>head having the TVIS.. which I don't want to mess with.. Also, will I
need
>to get any block work done to my 4AF for the new F head?
I'm not really sure which engine it comes from as I've never seen that
head
sitting on anything, though I've been told it's from a 4AFE of some
type.
The block you have will work fine with that head.
>Before I install the head I'm of course going to clean it up.. do a
port
>job on the intake side and port n polish the exhaust side.. 3 angle
valve
>job.. anything else? Also, I should be able to use my 244 cams with
the
>new head? Is the C/R any different with this head as well?
No, they don't need much done to them at all.
The cams you have will fit, and the combustion chamber is exactly the
same
as well.
Cheers,
Bill S.
EDIT: *I should mention that I believe that is from a 7AFE engine..*
Well considering the F heads for the 4A and 7A engine are the same, it doesnt really matter which engine it was from. Only thing thats different is the block.
right.. and apparently the 7A head had a better port design.
The only thing that I can see is the fact that the valve cover studs seem to be in different places.. so you would need to use the 7A's valve cover.. That would sit right on the 4AF block?
Last edited by |PuNiSh3R|; 01-24-2004 at 09:56 AM.
right.. and apparently the 7A head had a better port design. <- yeah well thats because its based on the 2nd gen 4A design, it has better ports, but ports dont necessarily mean flow. Sometimes making the tunnels smaller will actually increase power output, making them big will reduce flow....minus few exceptions, but a atmo engine relies on flow characteristics, unlike a forceinducted engine. Tuning a F.I engine and a N.A engine are REALLY alot different from each other, and what you do on a turbo engine, well... you wont want to do on a atmo engine, you'd just end up having a pile of shit
Well yea.. in a, F.I case you want large ports.. but in N.A small rough surfaced ports give you high velocity and turbulance so you get better fuel to air mixture.. and the higher velocity means more torque.. but as you stretch higher into the RPM band you need a larger port to draw in more quantities of air..
Which was the idea of TVIS.. small ports for low end power and as the RPMs increased the TVIS would open allowing a second intake port per cylinder for more mass flow.
Well the 4A-F isnt exactly a high revver, you get most power at around 5000rpm.... :P I'd rather go for low end on the 4A-F than a damn lawnmower civic
LOL.. well I kinda disagree.. the 4AF is a high rev'er depending on your modifications.. Stock.. no.. like you said it's around 5K... but with my 244 cams I still find useable power up to 7K.. If acceleration is needed I usually run first gear up to 7K or slightly over before I slap stick it into 2nd gear.. this way it lands second gear right into a strong part of my power band around 5K.. so no sluggish loss.. but I don't know how things will change now with the new carbs.. I'm still setting up my vacuum plenum and what not so I haven't driven the car yet..
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