20v head n a 4af

[NZAE92]

Hey
im thinking of puttng a 20v head onto my 4AF will it work?
if it does work what are some pointers to work on?
what sorta time am i looking at to put it in?
oh wil it actully bolt on?? (the main part)
what sorta hp gains are we thinking?
will it make itquicker off the mark
and is it really worth it??

any help will be much appreciated
cheers

P.S. sorry for so many questions

[canadianae92]

Originally Posted by NZAE92

Hey
im thinking of puttng a 20v head onto my 4AF will it work?
if it does work what are some pointers to work on?
what sorta time am i looking at to put it in?
oh wil it actully bolt on?? (the main part)
what sorta hp gains are we thinking?
will it make itquicker off the mark
and is it really worth it??

any help will be much appreciated
cheers

P.S. sorry for so many questions

-It will work mechanically but you also would need the 20v electronics
-uh pointer= don't do it
-um time... lets see you have wiring to do, do you know how to do that? It won't run on the 4af computer and the electronics would be a headache by the way. I doubt the factory fuel pump will deliver the fuel requested by the 20v ecu but i don't know.
-the head will bolt on to the block
-Well hp... lets see I imagine the 20v g head would flow better than the F head and it is designed for performance... at high revs, which your block/internals isn't designed to do... I don't know the specifics of 4af block internals but toyota had a different mind set when designing that engine compared to the 4age. I also don't think you will have the compression to make the extra fuel/air worth two shits(as in using it to its potential even) since your engine has likely been "well used" and even if it wasn't..... I guess the power you could expect could really vary depending on which 4af/e you have and its condition, you would be lucky to see 15 whp anywhere in the rev range.
-No, not enough to matter. Your car is fwd if you want to be "quicker off the mark" more power won't do that for you. Less weight and less rearward weight transfer(stiff rear suspension compression) matters more for launching a fwd. Your car would suffer terribly in cornering though and be pretty iffy.
-Nope, I don't know why you'd just want a 20v head anyways, just buy the whole motor harness and trans. That way you have the proper matching compenents and a platform for future refreshing and upgrades.

I haven't slept in a day and something hours so yea everything I said isn't perfect btw, probably lots of spelling and grammer errors.

You shouldn't be asking this question because I know its been asked before and actually I have responded to a question like this somewhere on some forum or in person. Do your research man /facepalm. Learn before you go and throw your money away or wreck your car.

[Donald]

Like canadianae92 said, it would be a lot easier to just do a complete engine swap, instead of the head.

To do just the head swap will require you to also swap the wiring, ECU, fuel tank, alternator, power steering pump, intake manifold, exhaust manifold, probably the oil pump, and the crank shaft pulley for the timing belt.

From what I have been told, the 20V is actually slower off the mark than the 4A-FE (less bottom end torque), although it starts making up for that when you hit about 4000 RPM.
It might be better than the 4A-F off the mark, but not by much.

[NZAE92]

thanks for that
and suprisingly there were no spelling mistakes
umm i think an engine swap would be great any way will need to save up a little bit more for the engine swap hmmm .thinking. 4AGZE or blacktop
i know the blacktop is better speed wise but the agze has the forced induction

[eage8]

the 4AF carbureted intake manifold won't fit on the on the 20V, the easiest way to go would be to get a double mikuni carb set up that I've seen on a bunch of AE86s. I'm pretty sure that fits a 20V head but that costs a whole lot but you wouldn't need an ECU.

you'd also need a 20V or modify a 16V 4age header to fit.

bottom line it's cheaper just to buy a full swap. I got my silvertop for $850 with an uncut harness, ECU, and c56 transmission.

[Rookie_One]

head will fit on the block, thats about it

and anyways, it wont improve the performance a lot, why?
block will not resist a engine turning at more than 7000RPM
4A-FE are low-comp, so you need to change the pistons