Cubic Inch / Nitrous ratio...
06-27-2005, 11:35 PM
#1
Cubic Inch / Nitrous ratio... Whats is the biggest shot of nitrous per cubic inch that anyone has ran? I haven't ran much but my car has seen 250 shot on a 346 or ~70% nitrous to cube. For some reason I remember reading somewhere possibly a pro mod page where your limited to 1.xx nitrous to cubic inch
Phil
Phil
06-28-2005, 12:08 AM
#2
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we got 405 rwhp gain out of a 408 (869 rwhp total). Had it not gone too rich Im sure it would have been 475 rwhp gain on the 408.
I really think it also has alot to do with the build. Cam, exhuast, heads, intake, rpms etc etc.
I really think it also has alot to do with the build. Cam, exhuast, heads, intake, rpms etc etc.
06-28-2005, 12:34 AM
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I heard a lot that you shouldn't spray more than you make on motor. If it actually comes down to that, you should be re-thinking your comination. LOL.
It all depends on the engines ability to injest the N20 and get rid of it.
Example: Last season we sprayed 600 on a 406 CID SBC. The ET's got lower and the MPH's got bigger was we went from 300 to 400 to 500 to 600.
It all depends on the engines ability to injest the N20 and get rid of it.
Example: Last season we sprayed 600 on a 406 CID SBC. The ET's got lower and the MPH's got bigger was we went from 300 to 400 to 500 to 600.
06-28-2005, 07:41 AM
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I imagine there is a limit that you could go back and establish a ratio of c.i. to nitrous hp. It seems logical that there's only so much volume that could be injested by a motor, but really don't think the ratio would be the same for all motors. There's way too many variables of how efficient the combination is. With all that speculation said, I've got friend that sprays 900 hp of nitrous on a 632 c.i. motor 
06-28-2005, 07:42 AM
#7
My question is if you have bigger cubes why would you need to spray a ton? You can only put so much down to the ground. If a 346ci can take a 300 shot and that gets you into the 9's then a bigger cubed motor should be able to live longer by spraying less and run the same times. Notice I say should.
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06-28-2005, 08:08 AM
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i spray 250, im planning on lighting the wick a little more soon and going to 300 with my 346
you can build the biggest cubed motor in the world, but if it isnt set up right, it wont make as much power as a 346.
it all depends on the setup.
a well built 408 or 427 should out perform a well built 346 with the same shot.
but it depends how effeciant the motor is.
my little 346 out performs alot of big motors with the same spray, on motor it doesnt but on spray it does.
you can build the biggest cubed motor in the world, but if it isnt set up right, it wont make as much power as a 346.
it all depends on the setup.
a well built 408 or 427 should out perform a well built 346 with the same shot.
but it depends how effeciant the motor is.
my little 346 out performs alot of big motors with the same spray, on motor it doesnt but on spray it does.
06-28-2005, 08:30 AM
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Noyzee I agree with your statement however as we all know an iron block weighs over 100LBS more than an aluminum block so it takes more power to overcome the weight difference. There is a point where volumetric efficiency stops. The engine has to be able to take in the air charge and exhaust it while using it's potential which is where the cam duration comes in.
Originally Posted by Noyzee
i spray 250, im planning on lighting the wick a little more soon and going to 300 with my 346
you can build the biggest cubed motor in the world, but if it isnt set up right, it wont make as much power as a 346.
it all depends on the setup.
a well built 408 or 427 should out perform a well built 346 with the same shot.
but it depends how effeciant the motor is.
my little 346 out performs alot of big motors with the same spray, on motor it doesnt but on spray it does.
you can build the biggest cubed motor in the world, but if it isnt set up right, it wont make as much power as a 346.
it all depends on the setup.
a well built 408 or 427 should out perform a well built 346 with the same shot.
but it depends how effeciant the motor is.
my little 346 out performs alot of big motors with the same spray, on motor it doesnt but on spray it does.
06-28-2005, 08:45 AM
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Originally Posted by Elite_Hot_Rod
Noyzee I agree with your statement however as we all know an iron block weighs over 100LBS more than an aluminum block so it takes more power to overcome the weight differance.
my next motor will be big cubes, but aluminum. oh and N2O ready. lol
06-28-2005, 09:28 AM
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The amount of nitrous an engine can handle depends on many factors. The compent strength, how well the engine breathes and its final power RPM capability. An Engine can handle twice the nitrous at 7000rpm's than it can at 3500. ( now this does not mean everyone engines can spray more than mfg rec, because the spun their engine harder.) EXP. An engine might blow up with a 400 hp shot right off the line on a single stage, but live all year long as a 400 hp dual stage on 200hp and 200hp. Even if the second 200 is delayed just fractions of a second. This is also why big racers use multi kits, and the high final spray number is in the upper rpms not down low. There will come a time I call intake saturation, where the engine can not longer use the amount of nitrous you are injecting into an engine. And air velocity will sacrafice and you engine will make less power even thou you are dump more nitrous into the engine.
Ricky
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06-28-2005, 10:41 AM
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Originally Posted by NXRICKY
The amount of nitrous an engine can handle depends on many factors. The compent strength, how well the engine breathes and its final power RPM capability. An Engine can handle twice the nitrous at 7000rpm's than it can at 3500. ( now this does not mean everyone engines can spray more than mfg rec, because the spun their engine harder.) EXP. An engine might blow up with a 400 hp shot right off the line on a single stage, but live all year long as a 400 hp dual stage on 200hp and 200hp. Even if the second 200 is delayed just fractions of a second. This is also why big racers use multi kits, and the high final spray number is in the upper rpms not down low. There will come a time I call intake saturation, where the engine can not longer use the amount of nitrous you are injecting into an engine. And air velocity will sacrafice and you engine will make less power even thou you are dump more nitrous into the engine.
Ricky
Ricky
Most all of this makes sense. Sometimes ppl get wrapped around the axle on someone else running 500shot, and as stated above, if done in multiple stages it is easier, more productive (less destructive) but sometimes that little part is over looked. I plan on running 200 wet off the line, and a 100 dry delayed about .5 of course this may get reversed depending on track, suspensions ability to deal with the initial hits, etc...
06-28-2005, 11:12 AM
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Originally Posted by CAT3
Ricky, I just hope that saturation time doesnt hit me with 300 on an Aluminum 347
Most all of this makes sense. Sometimes ppl get wrapped around the axle on someone else running 500shot, and as stated above, if done in multiple stages it is easier, more productive (less destructive) but sometimes that little part is over looked. I plan on running 200 wet off the line, and a 100 dry delayed about .5 of course this may get reversed depending on track, suspensions ability to deal with the initial hits, etc...
Most all of this makes sense. Sometimes ppl get wrapped around the axle on someone else running 500shot, and as stated above, if done in multiple stages it is easier, more productive (less destructive) but sometimes that little part is over looked. I plan on running 200 wet off the line, and a 100 dry delayed about .5 of course this may get reversed depending on track, suspensions ability to deal with the initial hits, etc...
Ricky
06-28-2005, 11:58 AM
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Originally Posted by VINCE
My question is if you have bigger cubes why would you need to spray a ton? You can only put so much down to the ground. If a 346ci can take a 300 shot and that gets you into the 9's then a bigger cubed motor should be able to live longer by spraying less and run the same times. Notice I say should.
More N20 = more power.
More cubes + More N20 = Double the fun.
06-28-2005, 02:05 PM
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Our old 707 cubic inch pro street car had a total of 1100hp sprayed on it. You had to have the scoop sealed good, or else the nitrous would come back out at WOT.
