Forged pistons and rods...looking for recommendations

[Unreal]

And pistons are just one part of compression. You pick a cc piston. That could be 9.5 with one heads and gasket and 10.5 with different ones. Most common ls blower pistons with stock heads and gasket are around 9.7-9.8. If you want 9.5 then you open up the head chamber.

[10aSSee D]

Originally Posted by cc-rider

Yeah I'm thinking of the exact same 9.5:1 compression. I've always liked your build 10aSSee. Very similar to what I had envisioned.

I hear all the arguments for higher compression...and I get it. But I think I would like to error on the side of safety as opposed to making the maximum dyno run power possible. I run 92 octane. But sometimes need to run 91 as well. Not sure what kind of power difference I'd be looking at with a 10:1 design vs a 9.5:1 design? I know that's a tough one to answer.

With a PD blower...the whole "off boost" performance is much less of an issue. I get that turbo builds need to stay a bit concerned about this. But with a PD blower, push the throttle down and go to full boost instantly. Takes away some of that concern.

Decisions, decisions. Always a trade off to think about...

Thank you. I will always run pump gas so the lower compression makes me feel better. I could always do a pulley swap and make more power but it runs fine just the way it sits. Look forward to seeing your build.

[jamesr]

CC mines about the same combo know all motors are different. Have callies rod and wiesco pistons stock crank compression is 9.7 2.8 kb make 700/644 on 91 with meth hopefully have the 17s on and take it to track

[cc-rider]

Originally Posted by jamesr

CC mines about the same combo know all motors are different. Have callies rod and wiesco pistons stock crank compression is 9.7 2.8 kb make 700/644 on 91 with meth hopefully have the 17s on and take it to track

Nice. Very similar build. Neat to see you in that 9.8:1 ranger. What kind of boost are you running? And timing?

[jamesr]

16psi at 7200

[Yezzir600]

Want to bump this thread for some help choosing forged pistons...
Can you guys let me know what size pistons everyone has gone with?

stroke? bore? (-/+)??cc dome rings sizing?

and rods?

for example, I get lost looking at all these options:
https://www.texas-speed.com/c-3245-pistons.aspx

I have searched a few builds but have know idea how to reach an exact compression number.

Curious about your build above fldrummer...

How do I calc all that up?

Yes I know the builder/machine shop know what they are doing and will help me through this but I don't like walking into anything blind and just say yes to whatever they spit out.

I'd like to put my own shopping cart together before they ever give me their "options"

I've read endless amounts of piston brand review threads but just cant come across clear help on how to spec them out.

Shooting for a:
vicinity of 9.8:1 ratio in a stock cubic LS3 for a
conservative slightly above 600rwhp. (currently 6psi, 540-550)
keeping stock crank
getting new bearings, rods, pistons
keeping stock heads

For the power should be plenty supported since currently have:
a tvs2300 with 1:1 rear (but will be going OD with build) and 3.8" front
Stage 1 PD custom cam
all new valve train (johnsons lifter, bronze bushing rocker, dual spring, valve, high pressure oil pump, chain, did not skimp out, etc.)
FIC850 injectors, zl1 pump, ADM FPCM, 3 bar map
CAI and Kooks 1 7/8"
clutch, shaft, axles will be next

Thanks in advance

[UNRIVALED SS]

Diamond Pistons
Callies H-beam rods

Don't look back. If you run low compression the pedal will feel soft.
You just have to tune it with a touch.

[cc-rider]

Originally Posted by Yezzir600

Want to bump this thread for some help choosing forged pistons...
Can you guys let me know what size pistons everyone has gone with?

stroke? bore? (-/+)??cc dome rings sizing?

and rods?

for example, I get lost looking at all these options:
https://www.texas-speed.com/c-3245-pistons.aspx

I have searched a few builds but have know idea how to reach an exact compression number.

Curious about your build above fldrummer...

How do I calc all that up?

Yes I know the builder/machine shop know what they are doing and will help me through this but I don't like walking into anything blind and just say yes to whatever they spit out.

I'd like to put my own shopping cart together before they ever give me their "options"

I've read endless amounts of piston brand review threads but just cant come across clear help on how to spec them out.

Shooting for a:
vicinity of 9.8:1 ratio in a stock cubic LS3 for a
conservative slightly above 600rwhp. (currently 6psi, 540-550)
keeping stock crank
getting new bearings, rods, pistons
keeping stock heads

For the power should be plenty supported since currently have:
a tvs2300 with 1:1 rear (but will be going OD with build) and 3.8" front
Stage 1 PD custom cam
all new valve train (johnsons lifter, bronze bushing rocker, dual spring, valve, high pressure oil pump, chain, did not skimp out, etc.)
FIC850 injectors, zl1 pump, ADM FPCM, 3 bar map
CAI and Kooks 1 7/8"
clutch, shaft, axles will be next

Thanks in advance

Looks like you got a nice build going there. You really should look into just buying a Livernois short block. They offer 9.8:1 compression ratio forged 416 strokers for $4999 advertised on their site (maybe you can get them for less too). They build some great engines.

[Yezzir600]

Unrivaled ss: What about the specs? compression outcome?

Cc-rider: I did look into to short blocks for a while, but it looks like rebuilding my LS3 saves me a few grand, granted I could probably make some back selling mine.
I really rough summary using my ls3: $2k labor, $2k parts, $2k machine shop.
Same using a new short block: $2k+ labor, $6k for short block after accessories/shipping, - $1-2k for my LS3
Might be worth taking a close look at again.

Back to choosing piston specs...
Ls3 is Bore x Stroke 4.06 x 3.62

How do I choose a piston?
If an example description is:
"Diamond Racing's L92 forged piston sets are built for customers that want to have the ability to run an L92/LS3 cylinder head setup! Diamond offers their stroker -21cc dished piston set in a 4.065" bore size for customers wanting to use a factory L92/LS3 bore size. These pistons are intended for customers looking to run a supercharged or turbocharged application. The specs for the piston sets are listed below: 4.065" Bore, 4.000" Stroke, 6.125" Rod Length, 1.115" CD (0 Deck at 9.240"), -21cc Dish, Standard 1.5mm/1.5mm/3.0mm Ring Pack, Premium 8620 Wrist Pins Included, Top Ring Depth .260", Valve Relief Depth .175" Intake and .105" Exhaust"

How do I pick a piston? Should Piston bore be 4.000, rings size? Choosing a stroke length other than the stock 3.62?
What affect does each have on compression calculations? and how does a -21cc calc in?
I need a tutorial lol

[Yezzir600]

another example,

I'm trying to fill out a calculator like this:

http://www.diamondracing.net/tools/

How do I find these values?

IE:

Gasket Bore
Head Gasket bore diameter ?

Comp. Gasket
Compressed Head Gasket thickness ?

Block Deck Height
Centr of main bearing bore to top of block ?

Top Ring Down
Top of 1st ring to top of pistons (FLAT) ?

Chamber Volume
Cylinder Head chamber volume in CC's ?


Piston to Deck
Top of BLOCK to top of piston (FLAT) @ TDC ?

[hillshooter]

http://www.csgnetwork.com/compcalc.html

use this calculator. its simpler

ls9 is a common gasket and is .0051 thick and 4.1 bore diameter.

deck height is tricky and can vary, mine is .040.

stock LS3 heads are 68CC

[UNRIVALED SS]

The simple answer. In my mind right at 10:1 works well for FI LS on the street.
Considerations for fuel, power level, torque range , and of course cam selection and FI type.
Nitrous, SC and Turbos have their own special quirks. There are so many things to consider and I have found that it is best to take the advice from one professional that has the experience to factor all those considerations. There are a few.
Someone mentioned Livernoise and they are certainly knowledgeable and have great plans for performance. Depends on where you are in some cases. Texas, Butler if you're in Tennessee. Lots of options depending you're perticular situation.

[2010SSRSM6]

Contact Cunningham MotorSports @ 951-677-0716. They have a setup that doesn't require machining the block and all forged components that will take all you can throw at them. The crank/block would become the weak link.