NITROUS OXIDE ( nos / n2o ) advice forum

has anyone ever fitted Nitrous to a BMW R1100S?

Yes we've had a couple of customers with that bike. One of them used to spend a good deal of time here but hasn't been here for a couple of months now. If you do a seach you should find some info.

Hi Trev

I did a search before I posted the question. I couldn't find anything.

Just a quickie or three! are there any issues with nitrous on a boxer twin? Strong enough?

how much will it safely take?

Wet or dry?

Avoid dry at all costs - see recent posts about a dry kit on a Viper.

I don't know what the limit is but it must be high enough to have satisfied my past customers, because I've not heard of any failures.

BMW aren't known for making weak engines, but even if we assume it's not the strongest of motors, you should still be safe to assume you can give the bike 40-50bhp without problems, or more with a controller.

It's a relatively unstressed engine for a bike, and compression not too high so should take nitrous well. A number of my bike customers have different BMW models and I'm unaware of any engine weaknesses which would cause concern for a nitrous installation.

And - I like the idea of an R1100 being able to surprise litre class race reps - and with a WoN kit, that's what you could do

That's what I figured.

I received an email from Lisa@noswizard.com today stating that you would recommend the Streetblaster 50 kit. Does this spray Nirous & Fuel into the airbox? Will it be fed from the bikes fuel pump or will it need another one?

By the way, I purchased your book some time ago and actually visited your premises with a view to fitting Nitrous to a Suzuki GT750 that I had at the time. But I decided to sell the bike and move to something that was wilder anyway. Enter the Kawasaki 750 H2! Yes, the widow maker. But mine is more so. I have just fitted huge reed valves to it and it puts out approx 120 BHP at the back wheel. Not alot these days, but not bad for a 37 year old bike.

This Nitrous just fascinates me, it amazes me how you can increase power so much, for so little money. I have a nice BMW R1100S that is just crying out for a huge power boost, just for a laugh.
Will be visiting Doncaster very shortly.

Hi Trev

What you said got me thinking. Perhaps the Nitrous would be better on my Kawasaki H2 than the BMW.

I have heard that Nitrous can present problems with reed valves, freezing etc.

Is it better to inject before or after the reeds?

My H2 has no fuel pump, would I need to fit it with one?

Thanks for the info Trev.

The main reason for the change of heart was the fact that I lost my best mate in a road accident less than two weeks ago, he was on his bike when he was hit by a car. Since this happened I no longer want to ride on the road. I am going to sell the beemer, and use the Kawasaki on the strip just for a bit of fun. It's got to be safer without cars to contend with LOL.

Mike

Sorry to hear about your friend.

I understand your thinking as I went through a similar thought process, after I had my leg smashed off in a motorcycle accident some 35+ years ago.

However, I soon learned that Drag racing a bike was potentially just as dangerous, when a high speed severe tank slapper threw me off the bike and I bust one shoulder in addition to concussion etc.

That lead me to the thought that Drag racing a car would be safer but it wasn't long before I learned that I was also wrong about that.

Despite spending many years Drag racing bikes and cars I've survived it all and I'm sure that I'd have been at greater risk if I'd continued to ride bikes on the road, so you're almost certainly taking the right path and its one I'd recommend to all bikers BEFORE they learn the dangers of riding bikes on the road the hard way.

At least with drag racing, or any racing for that matter. Yes, there is a danger element, but at least you know the risk. If you was out riding steadily on a lovely sunny afternoon, or in the case of my mate, just riding to work one morning. You tend to forget the danger of some clown pulling out of a side road directly into your path.

Anyway, my Kawasaki. I have been looking at the intakes. it's going to be a real sqeeze to feed the nitrous/fuel before the reeds. I am thinking I may have to move the carbs back a little further.

Unless I'm missing something there looks to be tons of room to me.

Do the Reed flanges stand off from the barrels by about 2" or more (at least on the underside), as it appears and if so how far are they from the crankcase and how thick is the wall of those?

My initial assessment is that the answers to all those questions should mean the Venoms could easily fit in the underside of the Reed housing but pictures can sometimes be deceiving, so I thought I'd better ask.

I am sure there would be room into the reed housing, however. The brass coloured layer you can see is the reed valve, so to tap into the housing would be the wrong side of the reed valve.

I thought that was what you were looking to try - after the Reed blocks.

How thick is the flange between the Reed and the carb adaptor?

I will measure it tomorrow, how wide will it need to be?

I was thinking a alloy spacer between that plate and the rubber carb mount, specifically for the injectors.

I would be a little worried about putting nitrous in on the engine side and fuel on the carb side. just my inexperienced thoughts, but if anything happened to my reeds, it would sure run lean LOL.

all very good points Trev.

I think that plate will be too thin, I am going to have some alloy spacers made to move the carbs back a little.

I read somewhere on the internet that it's a good idea to have seperate fuel tanks!

What are your thoughts on making a small cylindrical fuel tank that would sit just in front of the clocks, looking a bit like an old suzuki RE5. With fuel just for the nitrous system.

ha Ha reading too much on the internet can be dangerous!!!!!!

I have my engineering guy on the case for the spacers. I am thinking approx 12mm thick, would that be enoungh ??

At present I have the standard three outlet vacuum tap, but it's crap, they all are. It doesn't turn off 100% and floods my left carb (when it's on the side stand) So a tap replacement is imminent.

I thought about a pingle some time ago, but for road use I wanted a reserve. It doesn't really matter anymore.