Ok, so i have a thought and i cant find an answer. can i put a 1.8l 7afe block in my DLX with the stock 4afe head, and just not use the knock sensor and run off the stock 4afe ECU. i know the rev will be slightly lower but i will work on that later.
Im actually not sure what i need to do to use the stock ECU. im just looking for a mild torque increase without redoing the computer setup as my DLX is gonna get the euro treatment for a different looking corolla till i can get the money for a 1.8L 20v setup
from what i heard the only the 4ag head can swap over to the 7af block, but the 4af doesn't fit ether the 4ag or 7af from what i've heard. like i said from what i've heard the distributor is the only thing that needs to be used from the 4af, i heard the 7af uses the same one, i'm hoping donald or someone will chime in to help on this cuz i'm not sure and donald and bunch of others have done 7afe swaps
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90 Geo Prizm: 4afe 3 speed auto 227k miles, gone to scrap R.I.P CJ
ahh i see, i saw that on google but i dont always believe what i see on google lol. so basically i can use a complete 7afe on the stock 4afe wiring harness.?
mounts and transmission would be the same.. wiring harness, ecu different. and you'll have to rewire the whole car... not worthy on my opinion ( had to give up that idea). but a guy told me that the 2nd generation 4afe is a straight swap..
mounts and transmission would be the same.. wiring harness, ecu different. and you'll have to rewire the whole car... not worthy on my opinion ( had to give up that idea). but a guy told me that the 2nd generation 4afe is a straight swap..
now thats what im intrested in. i have read that the second gen 4afe has better power numbers and a better head design with better cam profiles. anyone else what to comment on this. cause if this is the case i will straight up buy one next week and get it rebuilt and swap it in.
year for year the 4afe and 7afe heads are identical.
if you want to use the 4afe head from your year on a later year 7afe block... there's no reason why you couldn't.
if you really want to have fun use the 4afe pistons in a 7afe with the 4afe (from your year) head... that way you'll have higher compression, more displacement, and you can run the stock electronics.
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1) 2004 IS300 Manual/LSD/Sportdesign 2) 2010 Corolla S 5 speed 3) 1986 MR2 "MK1.22" 5sfe/s54 swap 3) 1995 Ford Explorer 4x4, TT/AAL/custom shackle lift, 31"s
year for year the 4afe and 7afe heads are identical.
if you want to use the 4afe head from your year on a later year 7afe block... there's no reason why you couldn't.
if you really want to have fun use the 4afe pistons in a 7afe with the 4afe (from your year) head... that way you'll have higher compression, more displacement, and you can run the stock electronics.
so a quick recap, using MY 1st gen 4a head, on top of a 7a block, using stock 4a pistons will let me use the stock wiring harness and ECU. i hope thats the truth cause that would be EPIC
if the 4afe head can fit the 7afe block then y can't the 4age head fit the 4afe block when the 4age head fits the 7afe block? cuz from what i've seen on these forums i have seen that everyone says the 4age head will not fit the 4afe block. you could always go to the local parts store and look and at both the 7afe and 4afe head gaskets and see if they are the same
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90 Geo Prizm: 4afe 3 speed auto 227k miles, gone to scrap R.I.P CJ
Last edited by jordanangel; 05-18-2011 at 02:30 AM.
^^ what he said lol. i just want to drop the bigger block in though. not a ge head. dont really wanna swap for that motor as i heard it dosent have as good of low end torque when compared to the 7afe.
OMG you guys are stupid or don't know how to read.
the 4age head WILL fit on a 4afe block. there's no issue there.
the fact is that you DON'T want to do it because the 4afe uses much lower compression pistons. The cylinder chamber on a 4afe is smaller and the piston is dished..... you throw a 4age head, which has a larger combustion chamber, on a dished piston 4afe block and you're sitting at like 7.0:1 compression.
it will bolt together but it won't run well. there's a difference there.
anyone who has said a 4age head won't fit on a 4afe block is stupid. sorry.
the 4afe has slightly less dished pistons than the 7afe (probably due to the 7a's longer stroke).... so if you use the 4afe pistons you'll increase the compression. Since the early 4a and 7a combustion chambers, I would assume, are essentially the same size you wouldn't see a loss in compression using the 4afe head on a 7a block.
almost all of the wiring is through sensors located in the head (or pieces attached to the head).... the computer is smart enough to compensate for the slightly larger displacement.... but if you're concerned just get an aftermarket adjustable FPR and raise pressure a couple PSI.
this stuff isn't rocket science.
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1) 2004 IS300 Manual/LSD/Sportdesign 2) 2010 Corolla S 5 speed 3) 1986 MR2 "MK1.22" 5sfe/s54 swap 3) 1995 Ford Explorer 4x4, TT/AAL/custom shackle lift, 31"s
The Following User Says Thank You to toyotaspeed90 For This Useful Post:
OMG you guys are stupid or don't know how to read.
the 4age head WILL fit on a 4afe block. there's no issue there.
the fact is that you DON'T want to do it because the 4afe uses much lower compression pistons. The cylinder chamber on a 4afe is smaller and the piston is dished..... you throw a 4age head, which has a larger combustion chamber, on a dished piston 4afe block and you're sitting at like 7.0:1 compression.
it will bolt together but it won't run well. there's a difference there.
anyone who has said a 4age head won't fit on a 4afe block is stupid. sorry.
the 4afe has slightly less dished pistons than the 7afe (probably due to the 7a's longer stroke).... so if you use the 4afe pistons you'll increase the compression. Since the early 4a and 7a combustion chambers, I would assume, are essentially the same size you wouldn't see a loss in compression using the 4afe head on a 7a block.
almost all of the wiring is through sensors located in the head (or pieces attached to the head).... the computer is smart enough to compensate for the slightly larger displacement.... but if you're concerned just get an aftermarket adjustable FPR and raise pressure a couple PSI.
this stuff isn't rocket science.
thanks man, glad to actually get a solid answer. looks like i need to start getting a 7afe block built from the ground up.
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