4afe Engine Mods

[quattro]

Sam Q,

 

Do you know if the 4ag valves fit in a F head? I'm sourcing out parts for the F head.

 

Thanks

[quattro]

does a 16v 4ag crank and flywheel fit in a 4afe block? thanks

[Sam_Q]

the 4age valves are quite long compared to the 4afe ones, why would you want to swap though?

 

 

 

the cranks can be swapped but only if you have the same big end size

Edited November 6, 2008 by Sam_Q

[quattro]

the 4age valves are quite long compared to the 4afe ones, why would you want to swap though?

 

 

 

the cranks can be swapped but only if you have the same big end size

 

I'm sorry, I don't understand. please explain further about the big end side.

 

I found ferea valves for 4age and wanted to place that insted of making a thinner neck of the valve which I think is dangerous and might break.

[Sam_Q]

well I don't off-hand know the size of the big end journal on the crank for the 4afe engine. I am fairly sure that they are 40mm which is the same as an early bigport 4age. Changing to that crank should be as simple as a straight swap and it would be a very worth-while upgrade as its a far superior model.

[Hiro Protagonist]

well I don't off-hand know the size of the big end journal on the crank for the 4afe engine. I am fairly sure that they are 40mm which is the same as an early bigport 4age. Changing to that crank should be as simple as a straight swap and it would be a very worth-while upgrade as its a far superior model.

 

There's a picture somewhere on Toymods (I think a page taken out of the 4AFE/7AFE Engine manual) that lists critical dimensions of the bottom end for the early and late 4AFEs (they changed significantly) and the 7AFE. I'm trying to dig it up now.

 

*EDIT: found them

 

 

 

Edited November 7, 2008 by Hiro Protagonist

[quattro]

nice read

[AE80Rollaguy]

good write up!!

[Sam_Q]

a bit more info on here

 

http://www.rollaclub.com/board/index.php?s...=25087&st=0

[quattro]

alright :y:

[quattro]

ok just got my internals. I'm doing a 4ag bigport block internals on a 4afe block.

same bore, so that means i don't have to rebore :) yey!

crank is 8 bolts so I can use aftermarket flywheels :( and got my exedy tripuck clutch :bash: thank god :hmm:

also got my new ecu and control module :y: ... all this work in 4 days I hope... plus plus... break in :D

 

still looking for valvesprings :D

 

ill keep you updated

[Sam_Q]

if you like I can sell you half of my stock 4age valve spring set or half of my 4age trd set. The reason why half is because I will only be upgrading the intake.

[yohann]

hey mate

I'm looking forward to see what comes out from your project cause i might do the same thing

I'm just not sure yet thow

cuase almost every thing youive done is going to cost me **** loads of cash:|

[quattro]

hey mate

I'm looking forward to see what comes out from your project cause i might do the same thing

I'm just not sure yet thow

cuase almost every thing youive done is going to cost me **** loads of cash:|

 

 

actually... for me, its not that much. i got 4age internals for $100 dollars(crank piston conrod lightened flywheel).

exedy - $300

20v st intake for $100

microtech ecu and indash control module - $900

happyness... priceless :P

 

 

i had to save my allowance to buy those :D but hopefully its worth it. ....plus my saving

now I'm broke... christmas is coming :jamie:

[Sam_Q]

how are you going to adapt that intake manifold?

 

you have to be carefully with the intake port angles, even though the 20v and the FE head have a very simular upright port angle the 20v head has the intake face machined so that theres less angle change between the manifold and the intake port angle. What this means is that when adapted the 20v manifold will need to be facing much more upright on the FE head than what it would on the 20v head. Confused? well I can do a drawing if you like