What is a reasonably safe RPM for this engine?
TECH Junkie
Joined: Dec 2005
Posts: 3,092
Likes: 11
From Dirty Harry:
"I know what you're thinking, punk. You're thinking "did he fire six shots or only five?" Now to tell you the truth I forgot myself in all this excitement. But being this is a .44 Magnum, the most powerful handgun in the world and will blow you head clean off, you've gotta ask yourself a question: "Do I feel lucky?" Well, do ya, punk?"
"I know what you're thinking, punk. You're thinking "did he fire six shots or only five?" Now to tell you the truth I forgot myself in all this excitement. But being this is a .44 Magnum, the most powerful handgun in the world and will blow you head clean off, you've gotta ask yourself a question: "Do I feel lucky?" Well, do ya, punk?"
Do I like seeing a stock lifter used at those kinds of RPM? Not really.
If I were the OP I would go up 200rpm until he felt uncomfortable with the RPM or it didn't pick up anymore.
Thread Starter
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
Again, thanks for the additional feedback. I fully understand that at some RPM there is no more benefit, depending upon cam and intake manifold.
I also have a "Super Victor with a 4150 TB" (the FAST 1400 CFM throttle body).
Honestly I don't think I am gaining much at 7000 compared to 6800 RPM and therefore am not inclined to try 7200 with the risk it entails.
I also have a "Super Victor with a 4150 TB" (the FAST 1400 CFM throttle body).
Honestly I don't think I am gaining much at 7000 compared to 6800 RPM and therefore am not inclined to try 7200 with the risk it entails.
TECH Regular
Joined: Sep 2013
Posts: 410
Likes: 0
I shifted my cam only motor at 7400rpm and it went a best of 6.38@104.5mph at 3000lbs. like that.
I even shifted it at 7200-7300 on a .93 jet when I started spraying it after I ran it N/A.
Stock 2002 LS1 bottom end with Katech bolts and a 239/247 110 custom grind.
He has a 2008 bottom end with floating wrist pins, beefier rods and way better rod bolts than my factory motor did.
I had a composite Fast 92mm manifold as well. My boss Jonathan used to turn his stock bottom end LS1 7800rpm. He had a Super Victor with a 4150 TB, our Polluter cam, LS6 sodium filled valves, 475psi of open pressure, 3/8" push rods and roller rockers. He had a T56 trans with a 5.00 rear gear and went 10.50's and 130mph at 3050-3100lbs.
He used to literally launch it off the rev limiter.
Both cars are well documented and lived a long life without breaking parts. I'd spin that thing up 200 more RPM each time until it quits picking up.
I even shifted it at 7200-7300 on a .93 jet when I started spraying it after I ran it N/A.
Stock 2002 LS1 bottom end with Katech bolts and a 239/247 110 custom grind.
He has a 2008 bottom end with floating wrist pins, beefier rods and way better rod bolts than my factory motor did.
I had a composite Fast 92mm manifold as well. My boss Jonathan used to turn his stock bottom end LS1 7800rpm. He had a Super Victor with a 4150 TB, our Polluter cam, LS6 sodium filled valves, 475psi of open pressure, 3/8" push rods and roller rockers. He had a T56 trans with a 5.00 rear gear and went 10.50's and 130mph at 3050-3100lbs.
He used to literally launch it off the rev limiter.
Both cars are well documented and lived a long life without breaking parts. I'd spin that thing up 200 more RPM each time until it quits picking up.
I would do it too... I shifted my cam only motor at 7400rpm and it went a best of 6.38@104.5mph at 3000lbs. like that.
I even shifted it at 7200-7300 on a .93 jet when I started spraying it after I ran it N/A.
Stock 2002 LS1 bottom end with Katech bolts and a 239/247 110 custom grind.
He has a 2008 bottom end with floating wrist pins, beefier rods and way better rod bolts than my factory motor did.
I had a composite Fast 92mm manifold as well. My boss Jonathan used to turn his stock bottom end LS1 7800rpm. He had a Super Victor with a 4150 TB, our Polluter cam, LS6 sodium filled valves, 475psi of open pressure, 3/8" push rods and roller rockers. He had a T56 trans with a 5.00 rear gear and went 10.50's and 130mph at 3050-3100lbs.
He used to literally launch it off the rev limiter.
Both cars are well documented and lived a long life without breaking parts. I'd spin that thing up 200 more RPM each time until it quits picking up.
I even shifted it at 7200-7300 on a .93 jet when I started spraying it after I ran it N/A.
Stock 2002 LS1 bottom end with Katech bolts and a 239/247 110 custom grind.
He has a 2008 bottom end with floating wrist pins, beefier rods and way better rod bolts than my factory motor did.
I had a composite Fast 92mm manifold as well. My boss Jonathan used to turn his stock bottom end LS1 7800rpm. He had a Super Victor with a 4150 TB, our Polluter cam, LS6 sodium filled valves, 475psi of open pressure, 3/8" push rods and roller rockers. He had a T56 trans with a 5.00 rear gear and went 10.50's and 130mph at 3050-3100lbs.
He used to literally launch it off the rev limiter.
Both cars are well documented and lived a long life without breaking parts. I'd spin that thing up 200 more RPM each time until it quits picking up.
But after cool down only cause of low piston to valve clearance.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
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