Ideal DCR / SCR for centrifugal setup
05-12-2012, 08:46 PM
#1
Ideal DCR / SCR for centrifugal setup I am looking for some advice as to a target DCR for a centri blown setup.
It seems there are many recent threads with higher static compression setups, getting some impressive numbers.
Here are some details aiming for:
-Pump fuel w/meth injection
- LS6 - 347 forged setup
- Brute Speed Blower cam
- LS6 heads
- Most psi the D1sc can throw at it
- Huge intercooler
- Street use only
So i enter the information for Diamond 11503 pistons for example and get a static Compression ratio of 9.747 and a dynamic CR of 8.569:1
3.905 bore
64.45 cc chamber heads
0.051 head gasket
-0.007 piston to deck
0.044 quench
is this dynamic compression tolerable?
I mean, having 10+:1 static Compression ratio, with their cam choice, could still only yield them a 8.5:1 Dynamic compression, no?
Or is this LOW?
It seems like higher compression is the way to go?
What is the Ideal DCR?
Thank you everyone for your input
It seems there are many recent threads with higher static compression setups, getting some impressive numbers.
Here are some details aiming for:
-Pump fuel w/meth injection
- LS6 - 347 forged setup
- Brute Speed Blower cam
- LS6 heads
- Most psi the D1sc can throw at it
- Huge intercooler
- Street use only
So i enter the information for Diamond 11503 pistons for example and get a static Compression ratio of 9.747 and a dynamic CR of 8.569:1
3.905 bore
64.45 cc chamber heads
0.051 head gasket
-0.007 piston to deck
0.044 quench
is this dynamic compression tolerable?
I mean, having 10+:1 static Compression ratio, with their cam choice, could still only yield them a 8.5:1 Dynamic compression, no?
Or is this LOW?
It seems like higher compression is the way to go?
What is the Ideal DCR?
Thank you everyone for your input
05-13-2012, 11:49 AM
#3
Correction. Since the Compression Height of the Piston is 1.310".
I have calculated that the Piston to Deck clearance is 0.006", not 0.007" out of the hole.
Giving a Static compression of 9.662 and
DCR of 8.496 using a 0.051 Gasket
DCR 8.683 using a 0.041 MLS gasket
SCR 9.879 using 0.051 MLS
I have calculated that the Piston to Deck clearance is 0.006", not 0.007" out of the hole.
Giving a Static compression of 9.662 and
DCR of 8.496 using a 0.051 Gasket
DCR 8.683 using a 0.041 MLS gasket
SCR 9.879 using 0.051 MLS
Last edited by vmapper; 05-13-2012 at 12:09 PM. Reason: added 0.041 gasket
05-13-2012, 11:53 AM
#4
Not much talk of dcr when it comes to forced induction. I have read for NA applications you don't want to exceed 8.75 for pump has, not sure how meth effects that number.
If you want to spin that d1 to its maximum potential I would keep the compression under 10:1. Your proposed build sounds perfect to me and with your choices I don't see why you won't make 800+rwhp!
If you want to spin that d1 to its maximum potential I would keep the compression under 10:1. Your proposed build sounds perfect to me and with your choices I don't see why you won't make 800+rwhp!
05-13-2012, 06:00 PM
#5
800rwhp? woah! That would be beyond my expectations.
Though this is put through a T-56 and soon to be 9" rear, I was thinking it would only get into the low 700's.
I guess Im not going to worry too much about Dynamic CR, unless someone else chimes in to say this build will not work otherwise...
Though this is put through a T-56 and soon to be 9" rear, I was thinking it would only get into the low 700's.
I guess Im not going to worry too much about Dynamic CR, unless someone else chimes in to say this build will not work otherwise...
05-13-2012, 06:08 PM
#6
800rwhp? woah! That would be beyond my expectations.
Though this is put through a T-56 and soon to be 9" rear, I was thinking it would only get into the low 700's.
I guess Im not going to worry too much about Dynamic CR, unless someone else chimes in to say this build will not work otherwise...
Though this is put through a T-56 and soon to be 9" rear, I was thinking it would only get into the low 700's.
I guess Im not going to worry too much about Dynamic CR, unless someone else chimes in to say this build will not work otherwise...
I went with what SCR Bob/Speed Inc both recommended as they've never steered me wrong before. I have little clue about the dynamic. It raises a good question for sure. I would also be surprised if you hit 800rwhp. I am thinking more along the lines of low to mid 700's with those heads and cubes even with the filter off.
