4agze pistons ina 7afe???, will they fit? Options

[StreetRacing10PS...]

I herd from a few ppl that 4agze pistons will fit in the 7afe, only thing is is that i thought the 4agze was a 1.6 and being that the 7afe is a 1.8 how would they fit?? Would the 4agze pistons be too small??

[nik]

I herd from a few ppl that 4agze pistons will fit in the 7afe, only thing is is that i thought the 4agze was a 1.6 and being that the 7afe is a 1.8 how would they fit?? Would the 4agze pistons be too small??
[right][snapback]275707[/snapback][/right]

the rods and block are shorter in the 4ag engines but stronger
both the 7afe and 4ag have 81 mm diameter pistons

[StreetRacing10PS...]

ok thanks, thats exactly what i needed to know. ill order them some time this week so when i get the turbo in and some new rods i can have it up to around 15 PSI

[nik]

ok thanks, thats exactly what i needed to know. ill order them some time this week so when i get the turbo in and some new rods i can have it up to around 15 PSI
[right][snapback]275719[/snapback][/right]

new rods and pistons and a 2mm head gasket you'll have to do the math on the displacment of the heads cc just the pistons will push from 8.5:1 to 11.0:1 (example go look at edo set up he did what you want to do) so use the gasket to lower your comp back down

also you might want to do a little work to the head if your going to 15psi nothing to bad maybe port it get a little more flow and maybe new valves

This post has been edited by nik: Apr 21, 2005 - 4:14 PM

[doGGy]

Ehm.... from 9.5 till 10.8 on stock bore to be exact.

ok thanks, thats exactly what i needed to know. ill order them some time this week so when i get the turbo in and some new rods i can have it up to around 15 PSI
[right][snapback]275719[/snapback][/right]

new rods and pistons and a 2mm head gasket you'll have to do the math on the displacment of the heads cc just the pistons will push from 8.5:1 to 11.0:1 (example go look at edo set up he did what you want to do) so use the gasket to lower your comp back down

also you might want to do a little work to the head if your going to 15psi nothing to bad maybe port it get a little more flow and maybe new valves
[right][snapback]275721[/snapback][/right]

[nik]

Ehm.... from 9.5 till 10.8 on stock bore to be exact.
[right][snapback]275724[/snapback][/right]

here is a link

http://www.6gc.net/index.php?action=members&itu=691


stock comp is 9.5:1 with stock pistons

4agze are made to make 8.5:1 or 8:1

but in the 7afe block with a 7afe head the comp goes up even with a low comp piston

in a few weeks i should know if a 4agze 8.0:1 piston in a 7afe block and 4agze head will go up or not i'm thinking it will a little probably a .5 to 1.0 increase if that happens i use a bigger head gasket to bring it to 8.5:1 or lower if possible

[Hanyo]

have we figured out how to connect the 4a pistions to the 7a rods?

I remember doggys saying something about it a while back

[Kwanza26]

have we figured out how to connect the 4a pistions to the 7a rods?

I remember doggys saying something about it a while back
[right][snapback]275819[/snapback][/right]

7A is press fit and 4AG pistons are full float. You'd have to machine the rod to full float pins instead of press...

[Hanyo]

so basically take the rod to a machine shop. and tell them to bore out the hole to hit the float pins.

[playr158]

ok we have rods covered

but where do we find the larger valves and retaining springs?

[nik]

ok we have rods covered

but where do we find the larger valves and retaining springs?
[right][snapback]276232[/snapback][/right]

the 7afe head or the 4ag heads?

[playr158]

7afe

[nik]

7afe
[right][snapback]276252[/snapback][/right]

with out doing any searching on my part get the valve diameter then length and see if any existing valve is the same if not custom time

up date
here http://www.bundy.com.au/Page1f.html
its under the nova 94-99 1.8l 7afe
there ss valves

remeber the geo, nova, corolla, and celica all got the 7afe motor

This post has been edited by nik: Apr 22, 2005 - 11:08 AM

[playr158]

just stick with new stock valves then

[nik]

just stick with new stock valves then
[right][snapback]276278[/snapback][/right]

in a 7afte set up i would leave them stock just cryo and shot peen them or polish its up to you but i would just leave them be

[playr158]

yea i really don't tend to change the size just have a 3 angle done

but shot peen is another good aspect

see i don't see why having the stock rods shot peen'd wouldn't fix the issue of them beeing week well
lets say this

i have my stock rods shot peen'd and i should be good for 200-225WHP?

[nik]

yea i really don't tend to change the size just have a 3 angle done

but shot peen is another good aspect

see i don't see why having the stock rods shot peen'd wouldn't fix the issue of them beeing week well
lets say this

i have my stock rods shot peen'd and i should be good for 200-225WHP?
[right][snapback]276316[/snapback][/right]

well i dont know. If you stick with stock rods i would shot peen them its a really good idea as for what kind of power they can handel i have no idea but at those levels i think you could be fine. Man i cant wait to get my 4340 Chromoly rods

[playr158]

well if you told me nik i would have gone in on rods with you
cause i want a set
ask then how much for a second set to be made

[StreetRacing10PS...]

Yea, I am looking at new rods too. I think I am going to have to go custom though

[Dr_Tweak]

Using 4AGZE pistons in a 7AFE will give you 11:1 compression. However, if you swap a 4AGE head on there, you'll be all set, 8.5:1 or 8.9:1 depending on which version you use. Plus the GE head is better anyway.