Don't rods usually only fail when coming up on the exhaust stroke because of coming up so fast with no real resistance and having to quick change direction? Nitrous or power output in general shouldn't kill the rods, mostly just RPM. Am I right on this? Also, sorry if this has been answered already, but how about a 100 (or even 75) shot on a 462 with a good fuel system - safe?????? Thanks all
I think you are looking at the timing retard the worng way, the way I understand it is that the nitrous is an accelerant (sp?) speeds up the burn, so you have to take out timing to prevent detonation, the torque and horsepower will follow due to better oxygenation, and more fuel. Gary
I forgot to add with hypereutectic pistions to my question above. Will they shatter on a mild 100 shot???? Also, I think you're right about it being an accelerant. With a signifigantly oxygen rich mixture it will burn quicker, so less time is needed for the flame front to travel across the piston. If it is not retarded some BTDC cylinder pressure will get out of hand.
timing yes i understanding that it is an accelerant but with too high timing and n2o there is too much pressure on stock rods and they will break, bend. I am thinking that a motor with lower timing will have less stress on its parts. As far a a 100 shot you should be alright jus make sure you have a good fuel system and maybe a colder plug depending on what you running.
This combo was ran the hypereutetic pistons. I ran .002 clearance on my pistons. They detonation sensative. THe will break on pump gas is you run into detonation problems. I know the crank should be fine but the rods are rpm dependant. What I said before about where to go with fuel pressure and jets should keep you in the clear. I think the 225 shot will be fine but I would go back to the 175 shot and play around with your fuel pressure on the small pill then move up. If you could get your hands on another Big Shot jet set so you could run the same jet on the nitrous and fuel side, that would be the ideal way to do it. If you stay under 63-6500rpm I would think if everything else in in order, you will be fine. Also if you up the nitrous to the next 275 or 325 shot, you are starting to get into the area where you need a rpm switch to control the nitrous IF you are running off a foot brake setup and WOT switch for the nitrous. Or are you just running a hand button? If you are running a foot brake and a WOT switch to bring the nitrous on, the high cylinder pressures at lower rpm from the nitrous will knock the ring lands right off the pistons. What are you running for compression, cam, and carb?
I forgot to add, I NEVER ran race gas or additives. THe Key to my combinatoin working was the Big cam with only 10.0 COMP. My cylinder pressures never got too high at too low of an rpm. I ran 32-34 degrees total timing with my nitrous.
Combination 12to 1 compression stock 850 double pumper and custom cam with around 570 lift dont remember specifics. converted stage 1 heads with stock rockers
stuff.... Can you fut a carb spacer between the carb and the plate?? It will like theadded volume but you may have to make your accelerator pump shot more aggressive. Stay on the safe side with your timing. If it asked for 6-8 for your jetting, then take out 8. Once you lean it out you may be able to get away with taking out 1-2 more degrees. Just watch your MPH and use it for a reference. You'll be amazed of the difference tuning the nitrous over adding more. Tuning the smaller shot over spraying more will mean less nitrous volume in the intake so it will run better and you should be able to stay away from "too much"/distribution problems. Depending on your cam spec and cylinder heads, you will hit a ceiling soon with how much you will be able to push thru your motor without making some type of change to the setup. With a side-to-side spray bar, you may have to hold off at the 225 shot since your spraying everything at the side walls of the intake instead of down the runners. Domintor style or custom Nitrous plates that spray font to back would be an improvement on distribution. How even is your spark plug color between the cylinders??? As long as its ok, so is the plate but keep an eye on it! :shock:
