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07-08-2002, 01:32 AM
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#1
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Registered User
Join Date: Feb 2002
Location: Salem, va
Posts: 853
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BOOST/NOS/COMPRESSION
I am putting togethor a 355 and im going to run around 10-12 psi boost aftercooled, and 100-150 nos. What compression pistons do I need and which pistons to go with? I have 6inch rods. This is a stock headed car with a cc306, and full exaust. Thanks for the help.
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1995 MYSTIC Z28
M6
T-TOPS
CHROME Y2K VETTE WHEELS
VORTECH S-TRIM
AFTERCOOLER
CC306 CAM
1.6 RR'S
HOOKER LT'S
MUFFLEX 4"
CHASSIS ENGINEERING 8 PT.
HARWOOD 2.5" COWL HOOD
NITTO 275-40-17 DR'S
__________________
95 Mystic Teal Z28
357 ci, cc224/236, Vortech t-trim
http://hometown.aol.com/boostfed95z/myhomepage/profile.html
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07-08-2002, 05:47 AM
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#2
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Moderator
Join Date: Dec 1969
Location: Buffalo, New York
Posts: 10,806
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You are going to have a problem with your setup. To run 10-12psi + N2O on pump gas you want a CR <9:1. The biggest dish I have seen is -21cc which will give ~9.75:1 with stock CC volume. I would get a set of -21cc pistons and pray a lot! Alternatively, only run the N2O with race gas.
Rich Krause
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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"
__________________
'95 Z-28 383: Procharger, nitrous, etc. BBC 27T race car. "Every man dies, not every man really lives" William Wallace (Braveheart)
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07-08-2002, 09:47 AM
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#3
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Registered User
Join Date: Oct 2000
Location: Omaha, NE
Posts: 1,862
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Rich, I remember seeing a -31 cc dish somewhere. If it wasn't 31, it was low 30's.
__________________
***99 Corvette FRC, STS TT install beginning Feb. 10th, 2006.
***94 Formula, Forged 357, Turbonetics T-76, FAST, 98+ front clip, should be over 600rw after the tune. SO STAY TUNED (pun intended)
***96 Impala SS BBB: tint, tunes, and twenties... the trifecta!!
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07-08-2002, 01:10 PM
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#4
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Moderator
Join Date: Dec 1969
Location: Buffalo, New York
Posts: 10,806
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Quote:
<font face="Verdana, Arial" size="2">Originally posted by Jesse_Boyer:
Rich, I remember seeing a -31 cc dish somewhere. If it wasn't 31, it was low 30's.</font>
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Jesse: thanks for the info. If that's the case, I say "go for it"with the caution that some pistons with alarge dish have weak crowns.
Rich Krause
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'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"
__________________
'95 Z-28 383: Procharger, nitrous, etc. BBC 27T race car. "Every man dies, not every man really lives" William Wallace (Braveheart)
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07-08-2002, 10:11 PM
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#5
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Member
Join Date: Sep 2001
Location: Lewiston, ID
Posts: 732
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keep the quench (piston-head clearance @TDC) tight, polish the chambers and piston crowns, maybe even get a ceramic coating on the crowns. That'll help avoid detonation. (also polishing the chambers will increase cc a bit)
Lastly, having a cam with a later intake valve closing point will reduce cylinder pressures.
__________________
1977 Camaro - 350 finally runs!
'86 Camaro SC - no engine/700-R4.
'92 LeBaron - all family owned, great driver, 52mm TB, more mods coming...
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07-08-2002, 11:22 PM
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#6
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Registered User
Join Date: Feb 2002
Location: Salem, va
Posts: 853
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Thanks for the help guys. What pistons would you recommend and where to get them? A website? THanks
------------------
1995 MYSTIC Z28
M6
T-TOPS
CHROME Y2K VETTE WHEELS
VORTECH S-TRIM
AFTERCOOLER
CC306 CAM
1.6 RR'S
HOOKER LT'S
MUFFLEX 4"
CHASSIS ENGINEERING 8 PT.
HARWOOD 2.5" COWL HOOD
NITTO 275-40-17 DR'S
__________________
95 Mystic Teal Z28
357 ci, cc224/236, Vortech t-trim
http://hometown.aol.com/boostfed95z/myhomepage/profile.html
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07-09-2002, 07:53 AM
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#7
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Moderator
Join Date: Dec 1969
Location: Buffalo, New York
Posts: 10,806
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Quote:
<font face="Verdana, Arial" size="2">Originally posted by BOOST FED 95Z:
Thanks for the help guys. What pistons would you recommend and where to get them? A website? THanks
</font>
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http://www.jepistons.com/automotive.asp
Rich Krause
------------------
'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"
__________________
'95 Z-28 383: Procharger, nitrous, etc. BBC 27T race car. "Every man dies, not every man really lives" William Wallace (Braveheart)
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07-09-2002, 01:00 PM
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#8
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Registered User
Join Date: Oct 2000
Location: Omaha, NE
Posts: 1,862
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Anyone do a search for -31cc dish pistons? I know its been discussed before on this site. Maybe they were custom.
__________________
***99 Corvette FRC, STS TT install beginning Feb. 10th, 2006.
***94 Formula, Forged 357, Turbonetics T-76, FAST, 98+ front clip, should be over 600rw after the tune. SO STAY TUNED (pun intended)
***96 Impala SS BBB: tint, tunes, and twenties... the trifecta!!
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07-09-2002, 01:07 PM
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#9
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Moderator
Join Date: Dec 1969
Location: Buffalo, New York
Posts: 10,806
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Quote:
<font face="Verdana, Arial" size="2">Originally posted by Jesse_Boyer:
Anyone do a search for -31cc dish pistons? I know its been discussed before on this site. Maybe they were custom.</font>
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http://www.jepistons.com/pdf/2002-je4-13.pdf
Rich Krause
------------------
'95 Z-28 383 with Vortech, nitrous, etc.
"1FASTZ28"
__________________
'95 Z-28 383: Procharger, nitrous, etc. BBC 27T race car. "Every man dies, not every man really lives" William Wallace (Braveheart)
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07-09-2002, 08:01 PM
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#10
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Member
Join Date: Jan 2002
Location: trimble. ohio. u.s.a.
Posts: 139
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21cc dish on 355 lt1 is about 9.1 to 1.21cc dish on 383 lt1 is about 9.7 to 1
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07-10-2002, 01:05 PM
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#11
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Registered User
Join Date: Sep 2000
Location: KC; Where grandma drives in the left lane
Posts: 1,967
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Why are you using a 306 for that setup?
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