a stupid nitrous question

Draven · Post by **Draven** » Fri Feb 09, 2007 4:52 am

hey i was just wondering if i up the compression in my motor to say 10.5-1 or12.5-1 would i still be able to run 75 to 100 shot on forged rods and pistons

J-Villa · Post by **J-Villa** » Fri Feb 09, 2007 5:07 am

higher compression bad for turbo or nitrous...or at least what i have been always told

teamliviD · Post by **teamliviD** » Fri Feb 09, 2007 5:30 am

you can make a lot more power with high compression, but its very hard and unsafe for the motor thats why everyone runs low compression pistons. so to answer your question, on a DD, no, it would not be ok.

tooslow · Post by **tooslow** » Fri Feb 09, 2007 10:46 am

low compresion is good for turbo or sc because you are blowing hot air in there so there is more chance for detonation
but with no/2
you are basically cooling the air alot so with higher comp you don't have too worry about detonation so high compresion can be run with no/2.

Post by **racer12306** » Fri Feb 09, 2007 12:52 pm

the more compression the better, as long as the components can handle it.

there is almost no limit to compression when using nitrous as long as you have the correct fuel for it.

Draven · Post by **Draven** » Fri Feb 09, 2007 4:28 pm

ok im looking into geting the modern rebuild kit and a zex wet system is that good enough fuel oh and by the way i might want to mention that i am running an rt so the timing as advanced alot more i know the internals will be fine with the eagle rods and pistons im just wondering because i need to know where im going with my car so that i can start building it now since it is broke down right now

Post by **racer12306** » Fri Feb 09, 2007 10:09 pm

you will need to retard the timing in some way.

unsuper man · Post by **unsuper man** » Sat Feb 10, 2007 3:41 am

direct port or stfu.

drag cars run high comp on HIGH boost motors. so yes, you can do it on a nitrous motor easily and safly.

SGT BRAD · Post by **SGT BRAD** » Sat Feb 10, 2007 11:26 am

ok let's ask a question here. do you want to spend the money on an ignition and timing retard? do you want to hassle with the wiring? do you want to spend an extra 500-600.00 for the direct port kit? i submit that we're getting some bad advice here for non-race cars. if this car is your daily driver and you don't have any alternate transportation then take the tried and true advice from the nitrous sages. stay with a simple install and less than a 50 shot along with less than 10.5:1 compression. are you going for an all-out race motor? go 12.5:1 pistons, direct-port, timing retard, etc and have a bunch of replacement parts for each time it blows up.

Draven · Post by **Draven** » Mon Feb 12, 2007 2:04 pm

well i went to the experts on this one i went to zex themselves and here is what they told me

Jon, there shouldn't be any problems running nitrous on any high
compression engine as long as you have met the ignition timing and
octane requirements for the engine.

Thanks, Hadley @ Comp
Cams

so to me that says i can run 12.5-1 pistons and run the nitrous on pump gas and stock timing i think

Post by **racer12306** » Mon Feb 12, 2007 2:12 pm

i would think you might want a little more octane when on the juice. thats just me though.

SGT BRAD · Post by **SGT BRAD** » Mon Feb 12, 2007 2:25 pm

Draven wrote:well i went to the experts on this one i went to zex themselves and here is what they told me

Jon, there shouldn't be any problems running nitrous on any high
compression engine as long as you have met the ignition timing and
octane requirements for the engine.

Thanks, Hadley @ Comp
Cams

so to me that says i can run 12.5-1 pistons and run the nitrous on pump gas and stock timing i think

if you're not going to listen to any advice then go ahead and put the nitrous to her. based on the note from zex you will not meet their specs b/c you have no timing control. plus, the motor may not detonate if you are running 100+ octane race gas, but it sure will on 93 pump gas. that is unless you're just going for a 35 shot. ask any race shop what they think about running 12.5:1 on pump gas. most will tell you that it'll go up in smoke without a tight dyno tune. add nitrous to that and well...

quicksilvr · Post by **quicksilvr** » Mon Feb 12, 2007 3:10 pm

SGT BRAD wrote:if you're not going to listen to any advice then go ahead and put the nitrous to her. based on the note from zex you will not meet their specs b/c you have no timing control. plus, the motor may not detonate if you are running 100+ octane race gas, but it sure will on 93 pump gas. that is unless you're just going for a 35 shot. ask any race shop what they think about running 12.5:1 on pump gas. most will tell you that it'll go up in smoke without a tight dyno tune. add nitrous to that and well...

What he just said. It would be pretty foolhardy to run 12.5 comp on pump gas and spray N2O. I would say if you are not going to use anything to retard your timing, the most you could do would be 10.5 comp, 50shot, two heat range colder plugs...and at least 93 octane pump gas.

Sure, forged internals won't break as easily as stock stuff....but you still don't want to be detonating the crap out of them on a regular basis.

Post by **racer12306** » Mon Feb 12, 2007 4:35 pm

ok, atleast im not alone in my thoughts.

when i get my monte done it might only be a 600hp motor (in one of my dreamed up configurations), but it will run on pump gas. and then one of my options is to run 150 - 200hp nitrous system and use 112 or so as the enrichment fuel. rather than straight pump gas or straight race gas.

ragek23 · Post by **ragek23** » Sat Feb 17, 2007 2:39 am

found this if u still want to go with the 12:1 with nos.

http://cranecams.com/index.php?show=bro ... 4&prt=2011

Draven · Post by **Draven** » Sun Feb 18, 2007 2:20 pm

ive decided im just going to go with 9.2-1 comp and nitrous now i just got to order the parts and i am going to retard timing also does any one know how much i should retard timing it would be aprrecited ill be running 91-93 octane in my car and the rest will be stock other than internals and also how big of a shot can i run with the set up out of curiosity

ragek23 · Post by **ragek23** » Sun Feb 18, 2007 5:45 pm

well with the stock internals ppl usually run 50-75 shot with no issues. I am sure with the JE pistions at the 9.2-1 comp you could prolly run 100 but i would run 75 for durablility