B18A Intake Manifold on A20A

[Swap_File]

Here are more pictures:

B18B Intake against A20A3 Head


A20A3 Intake Side of Head

[carotman]

If the A20A1 head didn't have those holes for the injectors, it would be impossible for us to do the EFi conversion without swapping the heads. (which is a big pain in the butt)

There are some differences in the heads but the intake and exhaust ports are just the same.

[smufguy]

aside from the Exhaust valve length (longer on the A1) and the different camshaft profile (not sure abotu the cam gear) the head is the same between the A1 and a3.

[newaccorddriver]

ive just got my intake mainfold gasket and ive compared it to the B16A2 intake manifold ive got. apparently only 5 of the holes actually match up... ive got to drill 5 other holes, is that normal? all the ports match up though, but why does the gasket have holes between the runners when theres nothing flowing through them?

[Bglad420]

Bolt holes probably..........

[speedpenguin]

just read this whole thread. good info!
i'm switching to EFI early this spring, so just to clarify for my feeble mind, can i take this to mean i can use the B18 (instead of the A20A3) intake manifold when i do the swap? sounds like an awesome idea.

[smufguy]

yes speedy you can do it. just gotta splice some wires or just swap the sensors themselves, but as you know, ur not gonna have much low end.

[speedpenguin]

i thought the B18b gave you a gain in low end

[w00tw00t111]

Not to totally switch this subject but, since I'm wanting a good powerband for drag racing *1/4 not 1/8* then what would be best for our cars? Higher Low end so that you get power*and for that matter torque* off the line or is having a slight delay until you reach 3500-4000 and then just make sure that when you upshift you land back in the powerband more preferable. I've wondered the same thing about cars w/ root blowers vs. turboed. The blower is going to be making max boost from the moment you lay your foot on the peddle where as the turbo will *most likely* make much higher peak hp but, it will take it much much longer to get there...Which is better for drag racing? I mean it seems like both have their advantages as well as disadvantages.

Thanks hopefully this can somewhat clear the air as to what's better for our cars depending upon what you'll be doing w/ it.

[Accordtheory]

The blower is going to be making max boost from the moment you lay your foot on the peddle where as the turbo will *most likely* make much higher peak hp but, it will take it much much longer to get there...

That's not the way I understand it to be, I have always understood boost to be a function of rpm with superchargers. In other words, boost increases with rpm until you have some type of bypass valve open. When you floor the pedal, you don't have the same amount of boost at 1500rpm as you do at 5500. However, I haven't built anything with a supercharger..yet. I imagine all of the variables can be played around with.
With a turbo, you have nothing, then that nice evil whistling, then tirespin. When you engage the next gear, your turbo is still pushing whatever boost your wastegate is set to, provided you know how to shift and have a blow off valve. A turbo will always put down more average power over the powerband than a supercharger for other reasons too. When I say powerband, I mean the rpm band between shifts under maximum acceleration, not necessarily street driving.

[sporkHSP]

With a turbo, you have nothing, then that nice evil whistling, then tirespin.

then you sir need better tires.

[newaccorddriver]

then you sir need better tires.

slicks arent practical enough.

to keep this thread back on the topic i have a question. i got a B16A intake manifold and im pretty sure there is a drop in low end power. what im wondering is, will having a turbocharger compensate the power thats lost in the lower rpms?

[gfrg88]

whats up with everybody and lower rpm's???

with turbo i think your going to lose even more lowend, but it also depends what kind of turbo you get....

[Sporno]

so i im going to the junkyard this weekend and alll i need to get is the B18A intake manifold and the fuel rail and im good to go. how much do u think its gonna cost for those parts?

[247shuer247]

bumpity bump

[CHAR POW]

yes speedy you can do it. just gotta splice some wires or just swap the sensors themselves, but as you know, ur not gonna have much low end.

smufguy do i understand you have a header for sale ?