punsun + nos

[meadejones]

does anyone know how to install a nitros system on a 25hp punsun?

[coachgeo]

You may know this already..... or your just assuming Nitrous is what you add just like a petrol engine. But just in case.....

Nitrous is NOT what you want to boost diesel!!!

The company's that sell nitrous kits for diesels are in a large part just feeding mail ego that was conditioned thru their petrol life to think that Nitrous is what you GOTTA HAVE or your balls are tiny.

Now in Petrol world.... the laws of chemistry/combustion do show Nitrous is a PRIMARY effective fuel enhancement. Bully Dog and the like are selling to folk who 'ass..u..me' ; like a petrol engine, Nitrous will give them.... ah I mean their diesel engine bigger balls as well. If the Customer wants it..... give it to them... make money of a fool. Granted they also sell it to folk who dont care about their balls, but assume the same path is followed for petrol as what you follow with a diesel..

Why they dont just tell them the truth..... is a good question!!! cause it is SIMPLY NOT TRUE that adding nitrous (alone) to a diesel will give you much boost. Laws of chemistry/combustion..... nope..... notta.. you dont start with Nitrous... and unless your running in competitions down a drag strip with intent to win major events .... you never will need a secondary fuel enhancer that Nitrous will give you.

For a diesel .... the laws of chemistry/combustion state that PROPANE is the primary fuel enhancer. Cheap turbo.... add propane. (and a EGT gauge)

[dethmachinefab]

If you have extra fuel to burn, nitrous will provide the additional oxygen to burn it. It has other benefits in a turbocharged set up, as it can "light" a large turbocharger, getting it spooling and making boost by creating the needed drive pressure. But in a diesel you must be very careful as one benefit, the cooling of the intake charge can go so far as to cool the fuel/air charge below the point of compression ignition. When this unburt fuel/air charge hits the exhaust manifold or the exhaust gasses/flame from another cyl it explodes, very violently destroying parts.

Have fun and post video!

[meadejones]

well the drags is the direction i want to go. my last run was in a petrol engine car and did 7.8 on the 1/4 mile. i want to see if i can build a bike that i can have fun with at the drags. so propane added would be a better way to go? how would i go about setting that up? if it is the better choice that is the way i will go.

[dethmachinefab]

I don't think that engine has near enough strength to handle any real increase in power. You read of plenty failures with no modifications at all.

Look into the 3cyl liquid cooled engines for higher performance builds.

[coachgeo]

dethmachinefab is right... first you must choose a more robust engine. Then how you set up propane injection (fumigation) for your engine is a good bit determined by what type of injection (DI, IDI, Common Rail) and also if your turboed and/or using an intercooler.

[espe]

We've build a crazy diesel dragbike at the technical skool some thirty years ago.
The engine was a JLO 2-stroke diesel that we took from a 2 wheeled Holder tractor. We trimmed the flywheel down to almost half the original thickness and unhooked the regulator. On the intake we mounted a closed plastic box with a volume of app. 2 litres. On this we mounted an airhose which in turn was feeding the air in from a small compressortank and a pressure regulator that could deliver air with a pressure from 0.5 to 8 bar. the fittings of the hose and regulator were all 3/4". The pressuretank was filled up to 8 bar and the regulator adjusted around 1.5 bar.
It would run like hell as long as the pressuretank could deliver compressed air. originally the engine had to be cranked by hand but this was far too dangerous! We made a special electric starter that 2 people held against the take-up axle. As it kicked in it normally inmediatly revved up to about 1500 to 2000 revs. At full throttle it went up to almost 8000 revs. Also it looked and sounded like all hell broke loose! The muffler went ruby-red, it fogged up the complete skoolyard, all the welds teared up and you defenitly had to wear a kidney protector! After the second run the skool director banned the build for safety and environmental reasons.

[Blunt Eversmoke]

We've build a crazy diesel dragbike at the technical skool some thirty years ago.
The engine was a JLO 2-stroke diesel that we took from a 2 wheeled Holder tractor. We trimmed the flywheel down to almost half the original thickness and unhooked the regulator. On the intake we mounted a closed plastic box with a volume of app. 2 litres. On this we mounted an airhose which in turn was feeding the air in from a small compressortank and a pressure regulator that could deliver air with a pressure from 0.5 to 8 bar. the fittings of the hose and regulator were all 3/4". The pressuretank was filled up to 8 bar and the regulator adjusted around 1.5 bar.
It would run like hell as long as the pressuretank could deliver compressed air. originally the engine had to be cranked by hand but this was far too dangerous! We made a special electric starter that 2 people held against the take-up axle. As it kicked in it normally inmediatly revved up to about 1500 to 2000 revs. At full throttle it went up to almost 8000 revs. Also it looked and sounded like all hell broke loose! The muffler went ruby-red, it fogged up the complete skoolyard, all the welds teared up and you defenitly had to wear a kidney protector! After the second run the skool director banned the build for safety and environmental reasons.

GODDAMMIT!! A ILO 2-smoke diesel in a bike is a wet dream of mine (right next to a Lanz Bulldog hot bulb chopper ), and you have built one THIRTY YEARS ago, and with such winsome mods at that! Ooooh, the jealousy

[espe]

Jo Blunt,
I only wish we would have filmed it! But back in the days almost nobody had a camera and if they did it took pricy super 8 films.
Ill never forget the roar though.
For my current first experimental build I also wanted to get a compact two stroke. But they are really hard to find nowadays.
( A lanz hotbulb chopper mmm.. That would be something, wouldn"t it )

[Blunt Eversmoke]

Jo Blunt,
I only wish we would have filmed it! But back in the days almost nobody had a camera and if they did it took pricy super 8 films.
Ill never forget the roar though.
For my current first experimental build I also wanted to get a compact two stroke. But they are really hard to find nowadays.
( A lanz hotbulb chopper mmm.. That would be something, wouldn"t it )

Fun aside, your "boost bottle" charging system would make for nice, light and efficient brake energy recuperation: Replace brakes with small but efficient (multi-stage) air compressors, and have them fill up your boost bottle when you brake. Spend the compressed air when extra power is needed, during on-highway acceleration when passing trucks or somesuch. Way lighter than batteries, electro motors and generators, and arguably more fun, too