7a-ge - Toyota Nation Forum : Toyota Car and Truck Forums

Ukrainian102 · 01-07-2005, 07:56 PM

Hey. I have a 7A-FE in my 95 Corolla. I've been reading corollaperformance.com again, and I'm really interested in making it into a 7A-GE.

I'm wondering where I could get Toyota's G heads. Probably I would have to go to a junkyard and get then out of a 4A-GE. Anywhere I could buy them new?

Anyway I was also wondering how much work this would be. I have no experience taking out or taking apart engines, so I'm wondering if I could do it with some tools and a Haynes repair manual. Or is it too difficult a job for me to attempt?

Also, how much would fuel economy decrease and how much hp/tq would I gain with this mod?

Any input is greatly appreciated.

Flashmn · 01-07-2005, 08:05 PM

just get one from a junkyard... finding one new, well you could ask toyota, but... that would be big bucks.

Pineapple · 01-07-2005, 08:19 PM

It more then cut and paste. How good you're with wiring? You'll need ECU and other sensors from the 4A-GE. Just swap a 4A-GE.

Kwanza · 01-07-2005, 08:19 PM

Quote:

Originally Posted by Ukrainian102

Hey. I have a 7A-FE in my 95 Corolla. I've been reading corollaperformance.com again, and I'm really interested in making it into a 7A-GE.

I'm wondering where I could get Toyota's G heads. Probably I would have to go to a junkyard and get then out of a 4A-GE. Anywhere I could buy them new?

Anyway I was also wondering how much work this would be. I have no experience taking out or taking apart engines, so I'm wondering if I could do it with some tools and a Haynes repair manual. Or is it too difficult a job for me to attempt?

Also, how much would fuel economy decrease and how much hp/tq would I gain with this mod?

Any input is greatly appreciated.

If you've never taken apart an engine... this project may not be the best start because there is a degree of wiring involved, along with parts swapping. A haynes manual isn't gonna help you much either... It's not extremely difficult... but you wanna learn things and see watch the steps before you simply jump in.

I have a 4AGE head I can sell BTW, but you'll need more than that.

fredk · 01-07-2005, 09:33 PM

better off getting a entire 4age motor, manifolds and all

Ukrainian102 · 01-07-2005, 09:52 PM

Aright I think I'll pass on this for now. Thanks for the info.

Btw, a 4A-GE would be a lot less torque than a 7A-GE.

Jake25 · 01-07-2005, 10:40 PM

you'll need 4age belts

and a porsche 924 pulley

or is it the other way around.

***Tercel GTS*** · 01-07-2005, 11:48 PM

the valve reliefs on the pistons are different also, G heads have a wider valve angle therefore making the edge of the valves go deeper into the cylinders. The pistons may hit them.

xiao_sq · 01-08-2005, 12:18 AM

this will help a bit ^______^ http://www.club4ag.com/faq%20and%20t...20and%207A.htm

Pineapple · 01-08-2005, 12:47 AM

Quote:

Originally Posted by Tercel GTS

the valve reliefs on the pistons are different also, G heads have a wider valve angle therefore making the edge of the valves go deeper into the cylinders. The pistons may hit them.

I think its the opposite. Wide valve angle creat a higher chamber which the valve won't go as deep and has lower CR with the dished piston on the 7A-FE.

Flashmn · 01-08-2005, 03:07 AM

as far as I know, the pistons will hit the valves.

micro214_kp61 · 01-08-2005, 09:41 AM

Quote:

Originally Posted by Jake25

you'll need 4age belts

and a porsche 924 pulley

or is it the other way around.

nope.. it's the other way around. Porsche 924 timing belt and 4A-GE pulley!

another option is GATES timing belt.... T111-116 teeth, T107-117 teeth, T140-118 teeth

Ukrainian102... what i heard is that tuning would be hard to maximize the power of the said hybrid. the 7A-FE bottom end might not be strong to rev high enough that it can go with the high revving parts of the 4A-GE head. you have to figure out how to make the bottom end capable to rev like your head. i hope i didn't confuse you more.. hehehe

Jake25 · 01-08-2005, 01:05 PM

sure the torque in the 7A-GE Will be more, it was build for torque

but the 4AGE will for surpass it in HP...

Kwanza · 01-08-2005, 02:01 PM

Quote:

Originally Posted by Flashmn

as far as I know, the pistons will hit the valves.

Nope... pineapple is right... the 7AFE pistons are dished and the compression chamber size in the 4AGE head is significantly larger. There will be a compression loss and the valves won't hit.

Flashmn · 01-08-2005, 02:05 PM

Quote:

Nope... pineapple is right... the 7AFE pistons are dished and the compression chamber size in the 4AGE head is significantly larger. There will be a compression loss and the valves won't hit.

Have you tested it? Because the 4A-GE pistons have cuts in them for the valves, as the valves are at a larger angle, thats the problem and thats why they would hit.