Mk1 16v Project

[DaveMack]

sorry for the thread hijack but how the hell are pistons forged? how do they knock them into place? :S

Poured into moulds and then machined ... maybe.

Dave

[Preen59]

Poured into moulds and then machined ... maybe.

Dave

Mmmm not exactly....

Forging is the term for shaping metal by using localized compressive forces. Cold forging is done at room temperature or near room temperature. Hot forging is done at a high temperature, which makes metal easier to shape and less likely to fracture. Warm forging is done at intermediate temperature between room temperature and hot forging temperatures. Forged parts can range in weight from less than a kilogram to 170 metric tons. Forged parts usually require further processing to achieve a finished part.

Basically you can make a denser part than with a casting process. Which makes the grain structure tighter, and therefore stronger.

[Valver.]

Small update, decided to go to forged 82.5mm pistons.

I figured with all the other work i'm doing, i'd be crazy not to.

Any suggestions on a particular brand?

I would fit Wossner 11.5:1 - they are by far the best quality and price now and this is a better compression for a road car (mine detonated with any reasonable timing and pump fuel...). Bildon sell them for good money, but they are assholes...

You can by them direct but the Euro is hardly a star performer at the moment

I may have missed it, but what have you done with the rods? Reason I ask is that they're perfectly good balanced up and not worth the expense of upgrading (although the Scat ones are now very cheap).

[Preen59]

I would fit Wossner 11.5:1 - they are by far the best quality and price now and this is a better compression for a road car (mine detonated with any reasonable timing and pump fuel...). Bildon sell them for good money, but they are assholes...

You can by them direct but the Euro is hardly a star performer at the moment

I may have missed it, but what have you done with the rods? Reason I ask is that they're perfectly good balanced up and not worth the expense of upgrading (although the Scat ones are now very cheap).

Thanks for the advice. Although I have been told that it's better to take the material off the head and or block than to use High Comp pistons due to the fact that the high crown spreads the charge and can cause detonation and make the charge burn time longer. What's your take on that? Or due to the Head design, is it better to run high comp pistons? Also, i was thinking of only going 11.0:1, or would 11.5 be ok? In my experience my last 8v engine had 11.0:1 comp and it would detonate if i wasn't careful about the fuel/ignition.


I've got CRS Chromoly H beam rods out of the states for it. Rated for 600HP, shot peened, stress relieved brass little ends honed for floating pins ARP 3/8 L19 bolts etc etc and they were 300 bucks landed at my door. It was cheaper to do that than to bring my old rods up to scratch.





Thanks for the advice.

[Preen59]

OK.. this is what i've found so far to be the best prices for brands i trust..

Bildon Motorsport
Wössner 16v forged- US$549

Drag Performance (Ebay)
Custom JE 16v forged- US$600

Both come with rings, pins and clips..

I'm assuming Bildon will do wossner custom comp for me..

This Drag Performance mob will do any bore size any comp ratio in JE's for that price.. The only thing is that I don't know if the JE's price is for coated or uncoated.. And i haven't asked yet..

[WABIT]

well get it happenin mate, the only way your gonna know is if you ask questions mate

great progress BTW

dom

[Preen59]

well get it happenin mate, the only way your gonna know is if you ask questions mate

great progress BTW

dom

Hahaha, yeah i'll email the guy tomorrow. And thanks man.

[Valver.]

I'm assuming Bildon will do wossner custom comp for me..

Wossner will make anything for you www.woessner-kolben.de/ and I would definitely run the correct pistons rather than decking the hell out of the block or head - meaning you have wrecked them for any future work, especially if you do a gasket and have to shave the head again!

[Valver.]

P.S. Nice rods

[Preen59]

Wossner will make anything for you www.woessner-kolben.de/ and I would definitely run the correct pistons rather than decking the hell out of the block or head - meaning you have wrecked them for any future work, especially if you do a gasket and have to shave the head again!

Ok thanks for the link. Yeah i figured as much about the comp, but wanted a third opinion.

Not sure whether to go with Woessner or JE yet, i'll email this bloke doing the JE's for a good price and see what he says about the coating.

P.S. Nice rods

Thanks. Not bad for the price.. Just a little cheaper than carillo's. .