Alpha to Omega
10-23-2008, 03:06 AM
#21
1.0 BAR
Thread Starter
Join Date: Nov 2006
Location: Nor Cali
Posts: 385
Re: The Joy's of Boost now with polished Pistons
I did a new compression test to day
Cyl#1
Cold 170-psi
Hot 174-psi
Cyl#2
cold 170-psi
Hot 175-psi
Cyl#3
cold 170-psi
Hot 175-psi
Cyl#4
cold 170-psi
Hot 175-psi
SWEET
Cyl#1
Cold 170-psi
Hot 174-psi
Cyl#2
cold 170-psi
Hot 175-psi
Cyl#3
cold 170-psi
Hot 175-psi
Cyl#4
cold 170-psi
Hot 175-psi
SWEET
10-23-2008, 12:08 PM
#24
1.0 BAR
Join Date: Dec 2006
Posts: 277
Re: The Joy's of Boost now with polished Pistons
Sucks man - I don't polish them either in fact we shoot with aluminum oxide to rough them up just right (120 grit).
The valve reliefs I don't worry about on my forged pistons as even though the surface of a CNC piston is "mirror" like its actually the right texture its just that you're seeing the polish of cutting fluid and tool head. But definitely don't go and polish them.
The valve reliefs I don't worry about on my forged pistons as even though the surface of a CNC piston is "mirror" like its actually the right texture its just that you're seeing the polish of cutting fluid and tool head. But definitely don't go and polish them.
. What r you on like 8psi?
10-24-2008, 06:27 PM
#29
0.0 BAR
Join Date: Oct 2005
Posts: 0
Re: The Joy's of Boost now with polished Pistons
Originally Posted by Turbocharged Innovation
actually if you go to ur local machine chop(if thyre decent) u can have them media-blast them. u dont want them polished because it will slow atomization down.
10-25-2008, 01:29 AM
#30
1.5 BAR
Join Date: Mar 2005
Posts: 723
Re: The Joy's of Boost now with polished Pistons
Do what all successful racers do - hit them quickly with some scotch-brite pads to debur them, and move to the next step in life. But then again, successful racers use FORGED slugs, so maybe you're preceding in your wrong way correctly (lol) by polishing cast pistons. I think that last ***-hattery comment makes sense.
BTW is that a B20A? That's a whole different sort of fail, for that matter.
BTW is that a B20A? That's a whole different sort of fail, for that matter.
