Building a 7age.

[Delazy]

Its $80 + the cost of a sprocket...cant remeber the cost of the sprocket atm however...waiting on mime atm

[JinxD]

Bazda is in the process of doing one for me at the moment and a brand new one recut is costing me $156NZD to my door which is about $120AUD, seems like a very nice and knowledgeable guy, 7oxin put me onto him.

[Adsie]

I must have got a good deal then.

[H8CHIR6KU]

i have a few more questions.

1. i have read a few builds and some people use 4age headbolts and some use 7afe headbolts. these are different with the 7afe having different length headbolts. so what is the consensus on which headbolts to use. i wouldve thought you would use the headbolts to match the head.
2. why do so many people swap out the 7afe pistons for ae92 pistons? is it just to bump up the compression ratio? or is it more to do with the dome on the piston etc?
3. i have searched fro compression ratios with different 7age setups. but it seems everyone has different figures. what sort of compression ratio would a 7afe piston with a 7afe gasket + bigport head come out too?

[70XIN]

1. Yeah to match the head.
2. Yep, compression more than anything. With 7AFE pistons you have really really low compression (something in the 8:1 area) - only suitable for turbo - but because the pistons are pretty weak too they aren't suitable for that either haha.
3. 8.X:1, maybe in the low 9's if you're lucky. If you get some smallport pistons, you'll be up in the 11.5:1-12:1 area.

[H8CHIR6KU]

cheers man. looks like i need to put some pistons on the shopping list aswell then

actually just having a look at some acl pistons.

i notice though that they use the same part number for ge and gze pistons. anyone know what is up with that?

what pistons did you use for robos car 7oxin?

[70XIN]

Because you're looking at low-comp ACL pistons they are 'to suit' any 20mm pin 16V motor that's going to be turbo/supercharged.

As far as i know they did/do make high-comp pistons, but i've never really looked into it or cared haha.

We used 'hypatec' 4age smallport pistons in robos motor, and i must say they were excellent quality for the money (at least as good as factory toyota imo).

[R&D Mechanical]

Seamus, what do you recommend for a strong 7agte ? I am thinking about it and have a 7a engine on my way

[70XIN]

cheap rods (mine, belfab, spool, etc), GZE 8.9:1 pistons, and a good balance - BAZDA and other NZ folks all recommend the same type of setup

then ARP head studs and a stock genuine toyota HG, or TRD 0.5/0.8 if you want more compression. the head itself is all up to you

the great thing is, you don't have to spend crazy $$ to make an epic bottom end, it is a winner

[tauhu86]

If i am not mistaken the stock 7AFE gasket is 0.6mm and it's metal.
can anyone confirm this?
if it is so, using 8.9:1 pistons from a gze + 4AG head should result in some 9.2 - 9.5:1 CR?