Nitrous and hyperutectic pistons
Thread Starter
Le Mans Master
Joined: May 2003
Posts: 5,362
Likes: 3
From: Delray Beach FL
Nitrous and hyperutectic pistons
Not for my Vette, but a general motor question.
I was reading in a book on Nitrous that hyperutectic pistons should not be used on nitrous motors. I have a 350 with the following specs:
• Approximate 9:1 compression ratio
• High performance rod bolts and nuts
• High rev lifters and performance valve springs with retainers
• High volume oil pump
• Double roller timing set
• Flat top hypereutectic pistons and moly rings
• Harmonic balancer
• Screw in rocker studs
• Dart S/S Heads
• High performance stainless steel valves: 2.02 Intake; 1.60Exhaust
• Hydraulic Camshaft: .050 Duration: 230° Intake; 230° Exhaust, Advertised Duration: 292° Intake; 292° Exhaust, Cam Lift: .292 Intake; .320 Exhaust, Valve Lift: .480 Intake; .480 Exhaust, Lobe Center: 107° Intake; 111° Exhaust
• High performance bearings
• High performance head gaskets
• Four bolt main block
• Edelbrock Preformer Air Gap Intake
• Holley 670cfm Street Avenger Carb
Would it be safe to run nitrous on this motor? What would be the most you would run on it? Thanks.
I was reading in a book on Nitrous that hyperutectic pistons should not be used on nitrous motors. I have a 350 with the following specs:
• Approximate 9:1 compression ratio
• High performance rod bolts and nuts
• High rev lifters and performance valve springs with retainers
• High volume oil pump
• Double roller timing set
• Flat top hypereutectic pistons and moly rings
• Harmonic balancer
• Screw in rocker studs
• Dart S/S Heads
• High performance stainless steel valves: 2.02 Intake; 1.60Exhaust
• Hydraulic Camshaft: .050 Duration: 230° Intake; 230° Exhaust, Advertised Duration: 292° Intake; 292° Exhaust, Cam Lift: .292 Intake; .320 Exhaust, Valve Lift: .480 Intake; .480 Exhaust, Lobe Center: 107° Intake; 111° Exhaust
• High performance bearings
• High performance head gaskets
• Four bolt main block
• Edelbrock Preformer Air Gap Intake
• Holley 670cfm Street Avenger Carb
Would it be safe to run nitrous on this motor? What would be the most you would run on it? Thanks.
Melting Slicks
Joined: Nov 2004
Posts: 2,799
Likes: 2
From: Cape Coral FL
Hypers aren't recommended for heavy doses of nitrous (200+ shots), but will work just fine up to 150. Of course, this depends on the overall condition of your engine.
a 100 shot would be plenty safe
a 100 shot would be plenty safe
Thread Starter
Le Mans Master
Joined: May 2003
Posts: 5,362
Likes: 3
From: Delray Beach FL
Motor is 2 years old...has maybe 20,000 miles on it. So if I put a 100 shot on, I should be safe...cool. Just trying to get my 86 Monte Carlo SS running a little quicker.
Racer
Joined: Nov 2002
Posts: 420
Likes: 0
From: palm harbor fl
everything with nitrous is subjective,I wouldn't run more than a 100 shot max.I have friends who ran a 100 shot and destroyed their engines especially with hyper pistons,don't listen to it's safe because it is not their engine.I would also retard the timing to be safe and sneak up on the 100 shot to see if your engine can handle it,and don't get greedy.
Melting Slicks
Joined: May 2001
Posts: 3,014
Likes: 18
From: Raleigh, NC
"What's safe for my motor?"
That's a loaded question man. A 50 shot done wrong can blow one up, but the same motor might take a 200 shot forever if done right.
I wouldn't hesitate to put the 100 shot on your car. The hyper pistons are actually very strong, but they are very rigid. So rigid that just about any amount of flex will cause them to break. The only thing that would cause the piston to flex is detonation/pre-ignition/knock, so as long as you control that you should be fine.
For what it's worth, on a street car, I've never seen a nitrous fed engine fail because of the power the nitrous was making. Every single failure I have seen was detonation or knock related. Make sure you keep fuel to it, don't lean out, and don't go nuts with the timing, and I think you'll be very happy with the bottle.
That's a loaded question man. A 50 shot done wrong can blow one up, but the same motor might take a 200 shot forever if done right.
I wouldn't hesitate to put the 100 shot on your car. The hyper pistons are actually very strong, but they are very rigid. So rigid that just about any amount of flex will cause them to break. The only thing that would cause the piston to flex is detonation/pre-ignition/knock, so as long as you control that you should be fine.
For what it's worth, on a street car, I've never seen a nitrous fed engine fail because of the power the nitrous was making. Every single failure I have seen was detonation or knock related. Make sure you keep fuel to it, don't lean out, and don't go nuts with the timing, and I think you'll be very happy with the bottle.
