Rubber Duck· Premium Member
I'm getting ready to build my first LS engine and thought I'd look for any words of wisdom from the group since this forum seems to have the most experience with the LSAs. I've built several small block and big block chevys but this is my first LS. I've been reading several posts and am a little concerned about my cam choice for one and need to size the injectors. I'm thinking ID1300s for the injectors. Also I'm trying to decide between a 3" and 3.25" upper pulley for the supercharger. I'd like to be able to run on 93 pump gas but am planning on adding a flex fuel sensor to allow for E85. Also I'm hoping by going to a 3.825" stroke instead of a 4" stroke the stock piston oil squirters will work.
For starters, I looked at the Lingenfelter 900hp crank HP on 93 octane pump gas engine to get ideas and would like to get somewhere in that neighborhood. I've changed things enough that the engine will be a little unique.
-4.065 bore x 3.825 stroke (Same bore and stroke as COPO 396)
-LS9 Block and LS9 CNC Heads
-Callies Magnum 3.825 Stroke 8 CTW crank
-Callies Ultra I beam 6.125 Rods
-JE Pistons 8.9:1 with ceramic coating
-Total Seal Rings (second ring "gapless")
-BTR Stage 3 torque cam
-BTR Shaft Rockers
-Johnson 2110 Lifters
-Katech LS9 Head Studs
-Katech Timing Chain
-LS9 Head Gaskets
-Kong 2650 LSA Superchager
-ZL1 Supercharger Cover
-ATI balancer (8.66 SC Pulley)
FWIW - The rotating assembly arrived today from Callies so now I have most of the parts.
First just a comment on a Jones (Mike Jones) camshaft; you really@Rubber Duck
Cams, Cams, Cams - I'm second guessing the recommendation from BTR on their Stage 3 torque cam. I'm trying to decide on a direction and would like to get your thoughts.
My goal is 900chp on 93 octane (was originally going to mimic Lingenfelter's 900chp crate motor)
The cams on the table
BTR Stage 3 Torque (currently have)
.610/.600 valve w/1.7
Lingenfelter GT22 (used in 900chp crate motor)
.588/.595 valve w/1.7
Jones Cams recommendation
244/259 @ .050
.637/.612 valve w/1.7
Hasn't spec'd a cam but didn't like the BTR cam for my application.
Just to refresh
LS9 block/LS9 CNC heads
Callies/JE rotating assembly with center counter weights
3.825 stroke/4.065 bore (397 CI)
1 7/8 long tube headers
Kong 2650 with Kong 112mm throttle body
T56 Magnum - close ratio
3.42 rear gears
Going in a 3500 lb car used mostly for street with some autocross and drag racing
can't compare his cam lobes against other camshaft manufactures
lobes by simply looking at just the typical valve events.
Mike does not generate his lobe profiles, particularly his
open and closing ramp velocities, nor his flank rates the
same way others do.
Did you fill out the spec sheet for a cam online with Mike?
If so, can you cut and paste it with your next post. . . .
Also, are the cylinder heads ported, or stock?
Usually Mike asks you for the cylinder head flow.
If you gave him the flow numbers, what were they?
Also, Mike gives you the ICL. . . What is it?
And how much advance is ground into it?
Your interested in making ~900 rwHP.
At what engine RPM?
Are you going to have a problem with a rough idle?
Just a couple of parting comments:
With a 3.825 stroke and a 2.165" valve, the cylinder heads
will really have to flow well. Even with a 2.204" valve, you
would be right on the verge of meeting the engine cfm demand.
Finally; this 244/259 @ .050 exhaust duration tells me
that Mike feels there is a problem with the exhaust side
of the cylinder head.
Please understand; Here I am not attempting to be negative
about your build, I am just attempting to point out where you
might desire to focus moving forward..