Anyone have an article on what would be the best compression ratio for a nitrous motor??any advice would be very helpful! thanks
What do you mean by best? The lower the CR the safer it will be, the higher the CR the more power you’ll get. It’s pretty comparable to A/F ratios… rich = less power, safer; while lean = more power, unsafe.
ok maybe I should rephrase what i was trying to say…what would be the ideal compression ratio for a nitrous motor…stick with the stock 9.2:1 or bump it up or go lower? the motor is going to be sprayed on all the time,it will just be there if I need it.
What size shot? Wet or Dry? Do you have any means of tuning?
At 9.2:1 that seems safe, but it depends on the above questions. Going lower will always help, like I said, for reliability.
Tuning can go along way. It would be wise to invest into cam gears, and colder spark plugs for starters. Depending on your year, look into either TurboEdit (90-91) or Uberdata (92-93) for a free standalone.
EDIT: I’m thinking you mean’t that you WON’T always be using it, and that it will only be there when you need it. In that case, you might be able to get away with just retarding the timing. It just depends on your engines health.
Ideally you would want the highest C/R you can get with a dished piston. The best Nitrous piston i have used was the CP 11:1, which has a very small dome. With these and the 75 shot i was able to make 293 to the wheel and the motor was quite healthy for awhile.To play it even safer go with a 10-10.5 piston. Just make sure to go with a piston that has alot of material around the valve relief, which is the weakest part of a piston. Rough edges will also burn up instantly, so make sure they are nice and smooth before assembly.
josh
ps: nitrous likes to break things, especially bearings. I dont know how big of a shot you are running, but anything over a 125 will last a lot longer if you use two kits. Bringing it in “softer” will be less of a shock to the rotating assembly.
nitrous loves compression, the higher the better. the higher the compression the more likely you will need race gas.