Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

Cam and pistons for Big HP

Thread Tools
 
Search this Thread
 
Old 05-23-2004, 07:55 AM
  #1  
yak
TECH Fanatic
Thread Starter
iTrader: (15)
 
yak's Avatar
 
Join Date: May 2004
Location: SE Wisco
Posts: 1,393
Likes: 0
Received 3 Likes on 1 Post

Default Cam and pistons for Big HP

Hello all, I am in te final stages of planning my summer build. I am going to have a 382 lunati stroker with a LSX intake and 90mm TB, TEA stage 3 heads. My question is this; what sort of cam should i be looking at to make 500 hp NA to the wheels? I would like a streetable cam because I will be driving the car everyday. I would also like to keep a rather low CR because I will be going supercharged next year. Is there a cam that will give me good numbers with and without the supercharger and should I use the Lunati Pistons or get new ones? Thanks
Old 05-23-2004, 11:48 PM
  #2  
TECH Resident
 
someday's Avatar
 
Join Date: Apr 2003
Location: here, ny
Posts: 859
Likes: 0
Received 0 Likes on 0 Posts

Default

ur not gonna get 500rwhp with low compression, if ur gonna go with a supercharger, plan for it now, get the right heads/cam/pistons now, instead of having to buy a 2nd set of pieces later on... how r u lowering the compression, with the heads, or pistons? that will decide what to buy... also depends on how much boost u plan on running too... more boost = less compression
Old 05-23-2004, 11:51 PM
  #3  
jrp
SN95 Director
iTrader: (16)
 
jrp's Avatar
 
Join Date: Jul 2003
Location: Valencia, Ca
Posts: 10,755
Likes: 0
Received 4 Likes on 4 Posts

Default

Originally Posted by someday
ur not gonna get 500rwhp with low compression, if ur gonna go with a supercharger, plan for it now, get the right heads/cam/pistons now, instead of having to buy a 2nd set of pieces later on... how r u lowering the compression, with the heads, or pistons? that will decide what to buy... also depends on how much boost u plan on running too... more boost = less compression
exactly what i was going to say
Old 05-24-2004, 02:11 AM
  #4  
yak
TECH Fanatic
Thread Starter
iTrader: (15)
 
yak's Avatar
 
Join Date: May 2004
Location: SE Wisco
Posts: 1,393
Likes: 0
Received 3 Likes on 1 Post

Default

Well, I was planning on a D type ATI and running more than 8psi of boost. possiblly upwards of 15psi when I race it. If i were to use S3 LS6 heads on a 382ci I have a number of ways of relieving compression, heads, pistons, and a larger gasket? which method is more economical?
Old 05-24-2004, 02:14 AM
  #5  
jrp
SN95 Director
iTrader: (16)
 
jrp's Avatar
 
Join Date: Jul 2003
Location: Valencia, Ca
Posts: 10,755
Likes: 0
Received 4 Likes on 4 Posts

Default

i'd used dished pistons myself to lower the compression, then run head studs, a stock gasket and unmilled heads.
Old 05-26-2004, 10:12 AM
  #6  
yak
TECH Fanatic
Thread Starter
iTrader: (15)
 
yak's Avatar
 
Join Date: May 2004
Location: SE Wisco
Posts: 1,393
Likes: 0
Received 3 Likes on 1 Post

Default

what sort of cam should I be using? I dont want to go mechanical roller (high maintinance) thinking hydrolic roller. I dont know anything about duration and LSA. I want to go no higher than .690 lift. Any suggestions?
Old 05-26-2004, 11:33 AM
  #7  
TECH Addict
iTrader: (15)
 
LOnSLO's Avatar
 
Join Date: Sep 2002
Location: Gainesville, GA
Posts: 2,538
Likes: 0
Received 0 Likes on 0 Posts

Default

.690 lift? That's a tall order for a hydraulic lifter. Like said above, plan everything ahead of time, and don't make any changes as you near completion. It will create big probs down the road. If you want a good blower cam, then check in the FI section.
Old 05-26-2004, 06:14 PM
  #8  
TECH Fanatic
 
DenzSS's Avatar
 
Join Date: Nov 2001
Location: Kansas City, MO
Posts: 1,248
Likes: 0
Received 0 Likes on 0 Posts
Default

In general (remember...GENERAL) you want to go with a wide LSA and a short duration/high lift. You want to get that intake valve closed quickly to maintain low end torque on a centrifugal. Don't go with a high duration camshaft. You don't need it.

To give you an idea...we're making over 750rwhp/750rwtq with a hydraulic roller 427. The camshaft is a little old 224 single duration cam on 114LSA. That is seriously detuned with around 10psi boost.




All times are GMT -5. The time now is 11:40 AM.