NITROUS OXIDE ( nos / n2o ) advice forum

Hi,

how are you dealing with this?
I have a CR of 12:1 and am going to run up to 100hp on a ZX9R engine if all is well.

But will this work with high CR?
What CR are you running and how much N2O?
How much ignition retard per 50hp and what AFR?

So this is basicly a "where are the limits" Question.

Greetings Thomas

Detonation is the limiting factor and avoiding that depends on the following;

1) Compression, the higher the better as long as you don't suffer detonation up to a certain level of nitrous but after that lower compression is better.
2) Fuel octane - the higher the compression the higher the fuel octane you will need to use.
3) If using high compression and high octane fuel and you still suffer from detonation, then retarding the timing (BY WHATEVER IS NEEDED), is the only solution.

Is your model/year fo ZX9R known for having strong pistons?

I mention it because I run a ZX12R and have kept the nitrous to 50bhp (may go to 75) because the pistons aren't reputed to handle too much.

Octane is very important but to much is just as bad as too little,now I know that most think i am going over board here as no one know one wants to challange this but its really a matter of your engine and the heat it makes. This is where understanding fuel distilation and RVP comes into play and so many people use the wrong fuel and I was one of those till i understood things better. Why do you think VP makes 30 plus blends? If your lookinng at a fuel that says good for turbos...run the other way.. vaporization at what temps things like that...are you reading RON/ or MON there is a differance...pulsing also helps so much with the timing also and smoother response on your motor....

Here is some reading for everyone,and it backs what I learned and have been trying to say
http://www.vpracingfuels.com/page469659 ... on15613263

Once again just a crazy american trying to help...Oh Steve switched to the new NOS fuel by Sunoco and had great results.....


I suggest everyone read this when you get time....

Hi guys,


Its the 2001 year. 900 E2.
I dont know how strong the pistons are. It will be a step by step tuning anyway.

Also Fuel will be step by step starting at the fuel station with V-Power.

I´ll read the link Johnny like all your posts on the Forum


Greetings Thomas

Hi Thomas - nice machine, great bikes fom Kawasaki at that time (mine is a 2001 ZX12R).

I don't know if there is a good forum available for the ZX9R, but may be worth finding out if your bike has strong pistons as some other Kawasakis from that period are known to have weak pistons - 100bhp may be taking a risk.

I also suspect the clutch may not have much reserve strength on that bike. Muzzy do some good aftermarket gear for Kwaks, or follow Trev's advice and have your metal plates surface ground then shim to maximise spring pressure.

The german forum is crap
Still looking for a good one.

If i like the engine and kart with some N2O i may spend some money on aftermarket parts like pistons, Ignition clutch and so on.
At least i found out that the gearbox isn´t as week as the previous model

Greetings Thomas

Was talking to Tim Blakemore a while back, now he was saying a ZX9 motor should take 300BHP ok with no mods, he was talking of course about turbo charging, but BHP is BHP, and as long as the ignition timing is where it needs to be there should be no reason why you cant add more than 100 BHP of gas, especially as you will have lost the ram air system that was integral with the bikes fairing.
Tim also has a tuning shop specialising in kwaks, so would be a good source of tuning parts, and he's also a very helpfull guy and quite free with info, and being sponsored by kawasaki should tell ya something about the guy....

The only concern i would have using 100+ of gas on these engines is that they use nikasil lined bores and i have heard of this peeling off with nitrous use. Now whether that is caused by nitrous is another issue, and i dont know the answer. Ive not heard of it happening on these engines (9 or 12) and as a racer i know a few running gas regularly but not with such a large hit.

I would certainly have a chat with Tim as ive found him very helpfull, and if anyone knows what these motors can take he's ya man

Steve

Steve,you brinng a very good point up on the nickies as they say...I have done exhusting research on this and what i know is for small amounts there donbt seem to be many issues as long as the motor is run afterwards and the liners are in good shape now what a large amont is relitive to bore i guess but i would say there shouldnt be a isses as even Bretts Porshe is with nickies we would have to ask but I know a Lambo here that had nickies and hurt pistons melted them but didnt hurt the liners but when i spoke to the engine builder they usally put sleves in the when they go for high horsepower turbo and nitrous...

What happens is and this is from the sourse...if moisture..aka water and nitrous under combustion forms nitric acid and this is what can cause stripping of the coating....

I have of as late as last week had more conversations withthe 2 leading coaters here in the states and a long time 2 and 4 cylce sleve and bore repair manager of 30 plus years in the industry who has worked there in England and here in the states setting company and running them....I dont think small amounts will harm and I dont think large amounts will as long as you dont water inject and proper maintace is done...but most racers do like to shut it off and start it again when they get back at the track....if its driven i dont there is a proble...I will be doing this but with special 6061T6 liners installed so if i do have a problem i dont need to have the whole block stripped and redone...

Again some very usefull info there Johnny. Its not something I'd bothered to follow up on as none of my engines are nikasil lined

So there ya go Thomas, you should be able to run in excess of 100BHP with no worries.

Tim blakemore can be found here http://www.timblakemoreracing.co.uk/

Steve

Ha ha,

that sounds good

Thanks guys