Forged pistons on stock rods Hp/TRQ limitation?
Forged pistons on stock rods Hp/TRQ limitation? Soo im considering running forged 9:1 drop in pistons on the stock rods with my initial turbo setup build. I plan to build a 400+ CI engine down the road, but i want to be safe for the time being before that happens and replace the boost unfriendly stock pistons with some JE's. I currently have Katech rod studs installed and will use them with the forged pistons. What kind of HP/TRQ can the stock rods handle? I know the stock pistons are decent at 550 and can be pushed to 600, and some people have gone beyond 650. Risky **** for sure, soo with forged pistons, is 700 rwhp/trq feasible?
Yea then i have to do new rod bearings, kinda looking to try a budget/safe setup while on small cubes for ***** and grins. I will wind up using the 346 for my prerunner down the road after i put the 400+ CI motor in my car. It wont need forged rods in that, haha.
Sounds like a budget plan for disaster honestly.
Soo im considering running forged 9:1 drop in pistons on the stock rods with my initial turbo setup build. I plan to build a 400+ CI engine down the road, but i want to be safe for the time being before that happens and replace the boost unfriendly stock pistons with some JE's. I currently have Katech rod studs installed and will use them with the forged pistons. What kind of HP/TRQ can the stock rods handle? I know the stock pistons are decent at 550 and can be pushed to 600, and some people have gone beyond 650. Risky **** for sure, soo with forged pistons, is 700 rwhp/trq feasible?
8 sec potential, 12 sec slip
iTrader: (50)
Joined: Apr 2002
Posts: 4,092
Likes: 2
From: Savannah, GA
Get the forged rods right now. You can re-use them in your 400+ engine.
And for Pete's sake, dont be a tight ***! Get new bearings dude! Thats just stupid to re-use bearings when they are out anyways.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Lightweight stock rod + Heavier forged aftermarket piston = More stress on the connecting rod! Your forged pistons will be more durable, but you've effectively put more stress on the stock connecting rods. The rods would have been better off dealing with the lighter stock pistons. Plus, you will definetly have to have the rotating assembly balanced again just by changing pistons. I understand saving a buck, but you gotta draw the line somewhere. If your gonna buy the pistons, rings, pay for machine work to hone the bore for the new piston / ring combo...AND BALANCING...you might as well do the rods and get it done right the first time. If it were me, id leave it stock, or throw some rods in when changing pistons.
Lightweight stock rod + Heavier forged aftermarket piston = More stress on the connecting rod! Your forged pistons will be more durable, but you've effectively put more stress on the stock connecting rods. The rods would have been better off dealing with the lighter stock pistons. Plus, you will definetly have to have the rotating assembly balanced again just by changing pistons. I understand saving a buck, but you gotta draw the line somewhere. If your gonna buy the pistons, rings, pay for machine work to hone the bore for the new piston / ring combo...AND BALANCING...you might as well do the rods and get it done right the first time. If it were me, id leave it stock, or throw some rods in when changing pistons.
BUT that money i could use for pistons,,, i could buy a used alluminum 6.2L escalade block and start the 400+ build... 
I understand running the completely stock longblock... Many here have...
But if you have the money and the time to rip that block open anyway, how could it hurt to throw in a nice refresher of bearing, rods, etc?
I'd either build the block, or not...
But if you have the money and the time to rip that block open anyway, how could it hurt to throw in a nice refresher of bearing, rods, etc?
I'd either build the block, or not...
I'd say at the least put some good rod bolts in even if you leave everything else stock, which is what I would do. From what I've read/been told/seen/etc. the stock rod bolts are one of the most common reasons for failure of the stock shortblock.
TECH Apprentice
Joined: Jan 2008
Posts: 366
Likes: 0
From: Gladstone, Queensland, Australia
My LS2/L92 headed engine made 623 rwhp with 12 deg timing at peak torque and 11.5:1 afr nice and safe. Drove it for 2 months, raced it etc. Put it on the dyno last night and did half a dozen pulls tidying up the fuel map after installing new fuel pumps and it went bang after 10 runs spinning it to 7000rpm plus. Motor has 10.8:1 comp plus T trim and other bits had rod bolts in it stock rods and pistons. Motor never had detonation issues ran cold plugs very safe tune so had more in it just kept it 20 hp less then optimum. So yeah I found the limit. If I was building a motor specifically for boost i would run 9-9.5:1 comp forged pistons and rods arp bolts throughout lots of boost push the engine to the edge with the tune then back 20hp for safety and it will last. Fi u have to do things properly. Save ur money on ur fancy valve train, cams etc stock LS2 cam will makes power no probs with FI on low comp.
Lightweight stock rod + Heavier forged aftermarket piston = More stress on the connecting rod! Your forged pistons will be more durable, but you've effectively put more stress on the stock connecting rods. The rods would have been better off dealing with the lighter stock pistons. Plus, you will definetly have to have the rotating assembly balanced again just by changing pistons. I understand saving a buck, but you gotta draw the line somewhere. If your gonna buy the pistons, rings, pay for machine work to hone the bore for the new piston / ring combo...AND BALANCING...you might as well do the rods and get it done right the first time. If it were me, id leave it stock, or throw some rods in when changing pistons.
Bingo!
Thanks for saving me all the keystrokes !!!
Leave the long block stock in grenade mode, or build it for real and be done with it. Heavy forged slugs + flyweight stock rods = TROUBLE.
Drop the max rpm by 1k and it might live for a while.....might.
Save your $$$ and do it right.
You will save money in the long run.