high compression & nitrous on ka24de?

[uncle_louie83]

well...ive given up the turbo project because i found out the lady is pregnant a few months ago...and it sunk in that i am not going to be able to spend that kind of money anymore so i sold what turbo **** i did have....and now im thinking of putting SOHC pistons into the motor...later down the road get a set of good cams...but for now i was just going to do the stock sohc pistons and some nitrous...the motor is totally rebuilt...every gasket and seal...but we all know if i put in the sohc pistons im gonna have to tear it apart again. BUT i have stock nissan bearings, stock rods, stock dohc pistons and all the other stock **** in there. How big of nitrous can i go. I had a VLSD in and i have a stage 5 clutch. How well can a rebuilt engine handle say 100 shot....or 150 shot...or 200 shot? i know 150 and 200 is alot to go with but what if? and how well will the nitrous react when i change over to the sohc pistons? i heard high compression and nitrous get along well...so i need some info since ive never built an NA motor before...

lewis

p.s. its stock valve train too

[Veriest1]

The sohc pistons willyield approximatly 11.2:1 compression. You'll need to run high octane gas in order to preven detonation. If you want to run nitrous on top of it you'll need race gas... like112 octane depending on the shot size. A sohc equipped DE should keep you entertained long enough to wait on thecams andothergoodies.

Basically nitrous motors have the same requirements as turbo motors. High comp is a no no.

[uncle_louie83]

why is it that i keep hearing that nitrous loves high compression...i meen to me it doesnt make sense because ive never used the stuff....im used to turbo'd cars but thats gonna have to hold for a long time. So if i wanna use nitrous should i X out the high compression pistons and just use the stock ones?

how big of shot can a stock motor handle? with proper fuel/timing tuning that is?

lewis

[Veriest1]

From the nitrous FAQ zerothread?id=116962

Quote »Q: Can high compression engines utilize nitrous oxide?A: Absolutely. High or low compression ratios can work quite suitably with nitrous oxide provided the proper balance of nitrous and fuel enrichment is maintained. Nitrous kits are used in applications from relatively low compression stock type motors to Pro-Modifieds, which often exceed 15 to 1. Generally, the higher the compression ratio, the more ignition retard, as well as higher octane fuel, is required.

Q: Can service station fuel be used for street/strip nitrous oxide applications?A: Yes. Use of a premium type leaded or unleaded fuel of 92, or greater, octane is recommended for most applications. Many nitrous systems are designed for use with service station pump gas. However, when higher compression or higher horsepower levels are used, a racing fuel of 100 octane, or more, must be used. [/quote]Like I said, you'll need race gas on a high comp motor. Without race gas you'll need to pick one or the other. If it were me I'd choose the SOHC pistons since it's basically just a pop them in and forget about it deal whereas the bottle will need to be refilled on occasion.

[Veriest1]

Woot! Double post!

Quote »Q: Why nitrous?A: Forced induction guys will always give us hell because we have to turn ours on, but that’s the beauty. Nitrous is GREAT for a daily driver. You can drive a 350hp car around every day making 27mpg and go to work/school/mall/etc. and have fun. Go to the track, flip a switch, BAM, 150 more horses. Now you’re racing with ~500hp on a car that can be driven daily with confidence. Also, you can run higher compression. Nitrous loves high compression motors. Nitrous motors generally make the best street cars because of this. With turbos or blowers, sure you can turn down the boost or pulley down, but even then, you still have a hot air charge (even with an intercooler, the air is hot enough to cook an egg) and most blown motors have low compression. Low boost on a low compression motor=no fun[/quote]That's basically just saying why people like nitrous on high compression motors. Same as people who like nitrous one boosted cars. More timing and more octane.

[Thee 240sx Owner]

buddy of mine ran a 90 shot for about a year untill he stuck the turbo on the car... but he said he didn't noticed a difference till he got to a 90 shot.. he said 50 and 75 felt like a bump compared to a 90 shot which he said threw him a bit

[mackdaddy240]

You're the first person I've seen on here that lived this close, I'm in Pittsburg KS, I can say from experience that its safe as long as you run really good gas. I run 100 octane with my de with e pistons, and shoot a 50 shot. Like he said its a little kick but not much. I've never tried spaying more then 50 since I dont want to damage the engine, but it doesnt detonate with good gas, and its good for 14s with steet tires, and open diffMy ka24de is for sale right now too if you know anybody that wants one, its has been rebuilt about 8,000 miles ago and has quite a few mods.only $600 ! tell your friends to buy it.

[InsanityInc]

Nitrous doesn't "love" high compression. Idiots will tell you that because they think that a cooler intake charge is equivalent to lower cylinder temperatures, which is completely false. Nitrous gives you MUCH MUCH higher cylinder temperatures and pressure, since you're burning more gas and have more stuff in the cylinder.

[uncle_louie83]

hey mackdaddy...send me an email to [email protected] so we can talk about your 240...i can have it sold fast.

lewis

[pregmantis]

maybe bout 100shot will be ok, You dont necesarliy need race gas but it will help. I think what they mean by nos likes high comp is that nos really amplifies the power. nos allways does but I think you get a better effect as you raise comprssion.