Nitrous buildup, need advice
Thread Starter
Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
Nitrous buildup, need advice
I'm planning a 400 based 420ci motor, 4.155 bore, 3.875 stroke. Compression ratio around 10 or 10.5-1. I'd like to run a 100 shot or an occasional 150 shot of nitrous. The car gets MAYBE 6000 miles a year, all street. What kind of rotating assembly would you guys recommend for this kind of duty?
Would I need to go all 4340 or is that overkill? I don't mind spending the money if necessary, but I'm gonna have a bunch of other costs too. I want to run a 6" rod, so I'll be getting close to the top of the cylinder. Do I need to be real particular on compression height, rings and quench? I've never built an engine with nitrous in mind before, so I'm a big-time newbie :D
Thanx in advance, all advice is greatly appreciated :cheers:
Would I need to go all 4340 or is that overkill? I don't mind spending the money if necessary, but I'm gonna have a bunch of other costs too. I want to run a 6" rod, so I'll be getting close to the top of the cylinder. Do I need to be real particular on compression height, rings and quench? I've never built an engine with nitrous in mind before, so I'm a big-time newbie :D
Thanx in advance, all advice is greatly appreciated :cheers:
Safety Car
Joined: Aug 1999
Posts: 4,862
Likes: 118
From: Texas
Re: Nitrous buildup, need advice (Caboboy)
If you run a 6" rod you will have narrow ring lands that will be suseptable to breaking if you get detonation. A shorter rod wil give you a thicker, more durable ring land.
Le Mans Master
Joined: Oct 1999
Posts: 9,713
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From: Sachse Texas
Cruise-In I Veteran
Cruise-In II Veteran
Re: Nitrous buildup, need advice (Caboboy)
For a 100-150 shot, I would not take the Nitrous use into too much consideration. It is always better to build it better than you think you will need though. Look to your overall expected horsepower with and without the nitrous and pick components built for the horsepower. If you are planning on getting 700 horsepower, then you may want to seriously consider getting the better forged components.
Thread Starter
Le Mans Master
Joined: Mar 2002
Posts: 5,889
Likes: 2
From: Castro Valley Calif.
St. Jude Donor '03 thru '26
Re: Nitrous buildup, need advice (Vette92)
thanks guys. i'm gonna go with a shorter rod than i wanted to ( 5.85 instead of 6), just to make sure i've got enough compression height. weisco & je have both told me they'll make a piston that will hold up.
thanks for your insight :seeya
[Modified by Caboboy, 3:39 PM 7/27/2002]
thanks for your insight :seeya
[Modified by Caboboy, 3:39 PM 7/27/2002]
