Boosted, Blown or doped?

[Augiedoggie]

Saw recent discussions about blowers and such. Anyone consider the easy stuff? Nitrous is a healthy boost in power and fairly simple. Methanol fuel is relatively inexpensive and fairly simple to tune. Anyone here use the less complex power adders on our small engines? What's your experience? Any opinions on the simpler modifications?

 

[Augiedoggie]

https://www.c6performance.net/catalog/images/91Ik49FS5JL._SL1500_.jpg

 

[sparkwizard]

I played around with nitrous in some race cars that didn't belong to me and I put a hundred HP setup on a 327 in a Jeep.
That application was already a mismatch of power and handling. After the first bottle finally got empty, I removed the whole mess and gave it away.
Might be fun on a kart. I don't even want to be around a mini bike with nitrous on it. Looking forward to hearing if anybody has done it and survived.

 

[Triley41395]

Don't know if it adds any extra power but I've seen them run off coleman lantern tanks.

 

[Augiedoggie]

Don't know if it adds any extra power but I've seen them run off coleman lantern tanks.

Was it the canned liquid white lantern fuel or bottled propane?

 

[Thepaetsguy]

From my perspective the hard things are buying the billet rod/flywheel. Things like the cam bearing upgrade and the spring pocket cutters. bigger valves and welding the lifter bore so it doesn’t break. Welding up the guide so the valve stem doesn’t have to ride through straight epoxy only. Boost/nitrous all of the sudden doesn’t sound so hard. Once the smog pumps making 5psi hit the nitrous.

 

[Triley41395]

Was it the canned liquid white lantern fuel or bottled propane?

Propane tanks

 

[Thepaetsguy]

just modify a junker paintball gun. You can use a Pretty big size paintball tank and there refillable at walmart. Squeeze the trigger to turn on the nitrous.

 

[sparkwizard]

just modify a junker paintball gun. You can use a Pretty big size paintball tank and there refillable at walmart. Squeeze the trigger to turn on the nitrous.

????Pretty sure they run on CO2.

 

[Thepaetsguy]

????Pretty sure they run on CO2.

Yupp I was thinking of these. But still these are just screw in paintball canisters filled with nitrous not co2.. I’d bet you could fill a bigger paintball canister full just like these little cans and screw it into the paintball gun and use the trigger as a sprayer. Edit: moto whipits

 

[massacre]

My Dad and i each built drag bikes for the 100ft.
He runs a Briggs world formula on race gas with nitrous.
Mine is an 8.90 Blockzilla on methanol.

 

[Augiedoggie]

Let's see pictures and specs if possible. I'm interested

 

[massacre]

I'll see what i can find for pics. I had uploaded a bunch of pics before the site crashed and now they are gone.
As far as specs, the world formula started out stock, but then he sent it to someone local for some work. I don't have any details on that unfortunately.
The Blockzilla is just a typical 8.90 jr dragster setup. Polar clutch setup.

 

[Augiedoggie]

I once had an itch to build a monster drag mini bike to match race against the Harley guys at the local track here.
I figured it would be fun times and a killer twin engine mini bike could run with stock Harleys for bragging rights. I toyed with the idea for a bit and abandoned it after some thought. I retired from racing to free up my weekends for play riding and fishing. I figured racing would develop into a chore again.

 

[massacre]

Methanol is a pain. Changing oil and flushing all the time gets old after a while

 

[massacre]

Don't get me wrong. Ethanol makes great power and runs cool. For a race only bike it makes total sense.
my bike makes about the same HP naturally aspirated on methanol, as my dad's bike makes on race gas and nitrous.
It's just more maintenance.

 

[Augiedoggie]

My own experience with drag car engine building and motorcycle dirt track motors has given me a few ideas to apply to our smaller engines. Many of my customers and racing buddies start out by attempting to build the fastest, world beating motor and can't afford it or build a high strung screamer which just breaks shit regularly. It's cool to be king of the horsepower race, but it comes with a price. I often suggest a bigger, lower rpm motor instead of a smaller, higher stressed screamer.
A big block stump puller will run longer than a screaming small block motor. I wonder how this applies to our smaller motors used on our mini bikes?

 

[sparkwizard]

Same. There is still no replacement for displacement. Assuming you don't kill yourself trying to build a big, cast iron monster, a larger torque monster can be geared to teach the little guys some manners. Changing sprockets on a jackshaft is easier and cheaper than swapping ring and pinions on those cars.
We have a Predator 420 on an old Wheel Horse garden tractor. It did a couple of summers on a Coleman CT200u. It would throw sand all over a pretty strong 212 on an identical frame, even carrying a battery and a rider that weighs 100 pounds more.
I know I could not handle a built 420 burning alcohol. It was scary enough that we decided it belonged on a tractor.

 

[Augiedoggie]

I was thinking more towards a big friggin Vtwin predator with a huge rear tire and long wheelbase. Big tires and healthy steering rake would help the big pig stay straight for straight line drag racing. I'm thinking a 4000rpm red line would make plenty of grins on the drag strip. I'm thinking a variable belt drive to keep cost low and still give reasonable performance. Just some of my musings.

 

[sparkwizard]

Do you watch Cars and cameras on You tube? They have a v twin Predator, methanol, turbo with snow mobile TC on a home built rail.