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What forged pistons
Posted: Mon Sep 28, 2009 8:16 pm
by hollandgalant
I want to put forged pistons in my starion 4g63 SOHC. I have a RPW stage 2 cam. Does anyone knows what pistons can be used to behold the valve clearance? I was thinking about the wiseco 9.0:1
Posted: Tue Sep 29, 2009 3:44 am
by OLD FART
SOHC motors are not interferance so if you break a cam belt nothing hits and gets bent so your choice of pistons will be fine :)
If the same thing happens in a DOHC $$$$$ :(
Posted: Tue Sep 29, 2009 7:58 pm
by Entaran
wiseco's make a shitload of noise. Rattle like bastards.
Good piston tho.
Posted: Tue Sep 29, 2009 8:18 pm
by Anchor
Can you get a cam so massive that it makes it interferance??
When i got that head off you rad i remember i couldn't put it flat as a few valves were below the bottom of the head...
OT: i used CP's.
Posted: Wed Sep 30, 2009 5:51 am
by OLD FART
Anchor wrote:Can you get a cam so massive that it makes it interferance??
When i got that head off you rad i remember i couldn't put it flat as a few valves were below the bottom of the head...
OT: i used CP's.
BUT Did the valves line up with the flycuts in the pistons ??????
Posted: Thu Oct 01, 2009 8:11 am
by docile
OLD FART wrote:Anchor wrote:Can you get a cam so massive that it makes it interferance??
When i got that head off you rad i remember i couldn't put it flat as a few valves were below the bottom of the head...
OT: i used CP's.
BUT Did the valves line up with the flycuts in the pistons ??????
No would be the answer to that unless you get custom.
Posted: Thu Oct 01, 2009 6:12 pm
by hollandgalant
OLD FART wrote:SOHC motors are not interferance so if you break a cam belt nothing hits and gets bent so your choice of pistons will be fine :)
If the same thing happens in a DOHC $$$$$ :(
But is it still non interferance when you use pistons with a comp ratio of 9,0:1 and a stage 2 cam?
Posted: Thu Oct 01, 2009 7:00 pm
by RiceThief
My understanding has been that using dohc pistons in the sohc will make it an interference engine.
Posted: Thu Oct 01, 2009 7:06 pm
by redzone
a forum member down south tried that out and they're still not interference ;)
Posted: Thu Oct 01, 2009 7:10 pm
by RiceThief
redzone wrote:a forum member down south tried that out and they're still not interference ;)
I stand corrected then, good to hear though.
Posted: Thu Oct 01, 2009 7:18 pm
by Starion VR4
redzone wrote:a forum member down south tried that out and they're still not interference ;)
I'll 2nd that... they WON'T hit on a stage 2 cam.
Posted: Thu Oct 01, 2009 8:48 pm
by Lummy
Entaran wrote:wiseco's make a shitload of noise. Rattle like bastards.
Good piston tho.
So it's the brand of the piston and not the tolerance that made the noise?
Wow.
Posted: Fri Oct 02, 2009 9:27 pm
by enthuzed
redzone wrote:a forum member down south tried that out and they're still not interference ;)
Two of us in Melbourne (same suburb too, amazing!) have used VR4 style pistons and yes this is correct. Also drops the comp ratio a bit :)
Posted: Tue Oct 06, 2009 2:26 pm
by Anchor
I used DOHC 9.0:1 CP's and a massive cam. Still no interferance. :)
Posted: Wed Oct 07, 2009 5:49 pm
by Entaran
Lummy wrote:Entaran wrote:wiseco's make a shitload of noise. Rattle like bastards.
Good piston tho.
So it's the brand of the piston and not the tolerance that made the noise?
Wow.
It's more to do with the quality of the alloy and the heat properties of it rather than the tolerances.
If the piston shrinks or expands more than another BRAND's alloy then yes, it will make less or more noise.
Metallurgy is a fun subject! So is thermodynamics :/
