Building a 7age.

[rthy]

Am i allowed to do a dodgy and used a press pin with a smallport piston?

edit:
4AGE 100kw/Smallport Pistons use 20mm floating pin
7AFE Pistons use 20mm press pin

[Matt]

When i did my 7a with 20v pistons, it was pressed in... Was advised by the machiner not to put a circlip on it...

[rthy]

did you get the piston piston machined to fit the pressed gudgeon pin?

[Matt]

I paid the machiner $30 to do them for me, not sure if machining was required or not....

[rthy]

Thanks, did you have any issues with it?

just need to sort out the pistons then will blow tyres..... UP

[Adsie]

Mine uses stock 7AFE rods and 20V pistons. The pins are pressed into the rod and the piston can move. Pistons do not need to be modified.

[rthy]

i wonder if the smallport 16v are different to 20v ones?
But i have seen 16v pistons used on 20v blocks - then again donno if any mods are done.

[willa]

Have any of you guys used ca18 pistons in your 7a builds? I recently heard of someone who did, not sure on what c.r it ended up with though

[Matt]

20v pistons can easily be interchanged with 16v... so my pistons didn't need modifying...

[Delazy]

Without crunching numbers.. Something Sam Q might do if you ask him too...

Ca18 pistons are often used in smallport 16v 4.5ag builds...ie 83mm bore, offset ground crank...often resulting in higher compression that standard ae92 pistons...

From memory when robbo/seamus built his 7ag 16v they used smallport pistons and resulted in a high comp motor with little ability to wind timing into it (stock ecu)

using ca18 pistons would result in high compression again (in theory)...a 83mm bore with the less than ideal rod stroke ratio of the 7a could be asking too much...

I'm definitely no engine building expert, so don't take it as gospel...just selection of information I've retained over the years and knowledge from having my own motor built...