Good Nitrous Cam or Not
#1
Teching In
Thread Starter
Join Date: Feb 2003
Location: Chicago
Posts: 19
Likes: 0
Received 0 Likes
on
0 Posts
Good Nitrous Cam or Not
I just got done installing a tr230 (230/224 .575/.563 111 LSA) I was thinking of spraying a 75-100 shot of wet nitrous. I was wondering if this cam will be fine with the nitrous application or should i keep it N/A.
#5
Originally Posted by tuff
Good motor cam but not a good nitrous cam.It will still work but not as good.You need more exhaust duration.
#6
TECH Junkie
Join Date: Aug 2002
Location: Fort Collins, CO
Posts: 3,726
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by #41
kk, dont mean to jack your thread or anything, but what exactly makes a cam good for running nitrous?
If we assume that the goal of the nitrous cam is to trade some unusable torque (Limited by tires/suspension/track conditions) for usable horsepower, and open the exhaust valve earlier due to the increased burn rate, then choosing a nitrous cam is easy. You generally look for a cam with a larger exhaust duration then intake duration. It's typically anywhere from 4 - 12 degrees larger.
The choice of your duration difference is determined by your application. If you're only going to spray your motor a couple of times at the track each year, then it would be beneficial to choose a cam that would work better in a N/A situation, as that is where your car will spend most of it's time. If, however, you're building a car that sees more track/trailer time then street time, you can go with a cam that has about 8 - 12 degrees more duration on the exhaust side.
A good nitrous cam would be something like TSP's 231/237 cam, or MTI's 232/236 cam. It would also be advantagous of you to put either one of those cams on a 114 lobe seperation. That is, however, if you're going to spray a lot. If you're only going to put a few bottles through your car a year, you should stick with an N/A cam.
Trending Topics
#8
Launching!
Join Date: Nov 2003
Location: Denton/ Cypress, TX
Posts: 243
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by KingCrapBox
One of the main effects of nitrous is an increased burn rate, and because of this, the exhaust valve opening can occur slightly earlier then in a strict N/A application. Because the burn of nitrous/fuel/air is completed sooner, the pressure inside the cylinder begins to get smaller sooner inside of the combustion chamber, so the exhaust valve can open earlier without a loss of power. To make the exhaust valve open earlier, all you have to do is select a larger exhaust lobe and if you want, add a little lobe seperation angle, perhaps to 114 instead of 112.
If we assume that the goal of the nitrous cam is to trade some unusable torque (Limited by tires/suspension/track conditions) for usable horsepower, and open the exhaust valve earlier due to the increased burn rate, then choosing a nitrous cam is easy. You generally look for a cam with a larger exhaust duration then intake duration. It's typically anywhere from 4 - 12 degrees larger.
The choice of your duration difference is determined by your application. If you're only going to spray your motor a couple of times at the track each year, then it would be beneficial to choose a cam that would work better in a N/A situation, as that is where your car will spend most of it's time. If, however, you're building a car that sees more track/trailer time then street time, you can go with a cam that has about 8 - 12 degrees more duration on the exhaust side.
A good nitrous cam would be something like TSP's 231/237 cam, or MTI's 232/236 cam. It would also be advantagous of you to put either one of those cams on a 114 lobe seperation. That is, however, if you're going to spray a lot. If you're only going to put a few bottles through your car a year, you should stick with an N/A cam.
If we assume that the goal of the nitrous cam is to trade some unusable torque (Limited by tires/suspension/track conditions) for usable horsepower, and open the exhaust valve earlier due to the increased burn rate, then choosing a nitrous cam is easy. You generally look for a cam with a larger exhaust duration then intake duration. It's typically anywhere from 4 - 12 degrees larger.
The choice of your duration difference is determined by your application. If you're only going to spray your motor a couple of times at the track each year, then it would be beneficial to choose a cam that would work better in a N/A situation, as that is where your car will spend most of it's time. If, however, you're building a car that sees more track/trailer time then street time, you can go with a cam that has about 8 - 12 degrees more duration on the exhaust side.
A good nitrous cam would be something like TSP's 231/237 cam, or MTI's 232/236 cam. It would also be advantagous of you to put either one of those cams on a 114 lobe seperation. That is, however, if you're going to spray a lot. If you're only going to put a few bottles through your car a year, you should stick with an N/A cam.