ESE's works engine tuner

[jasonu]

Hi Guys

As some of you know I have been developing my 300cc NSR. Next weekend see's its first proper racing at Hampton downs. Its going really well except the pipes are cracking and braking all the time. They are SS no surprise. They really do cool very quickly and obviously heat fast as well. I was wondering if lagging the pipes for the first 300mm is a good idea to keep a bit of heat in there and not let them cool so fast. Will this help with the cracking yah reckon. Also could it help with throttle response. The pipes are the next thing to come but will not be made till after xmas.

Any bright ideas welcome. Cheers Rich.

I'd look at the way the pipes are mounted. Post a couple of pix would ya. Then again, I have never owned a SS pipe.

[twotempi]

Yeah, and alcohol is for drinkin'. So what have we got left? Nitromethane? Or should we go straight to nitroglycerine? Or TriNitroToluene? Oh no, that's not a liquid. Hydrazine maybe?


The early American board racers used a mixture of picric acid and ether !! In case you didn't know picric acid is the main ingredient of denonators !!! What ever you do ,don't fall off your bike !!

[TZ350]

4 cylinder, 2 stroke, supercharged and rotary valve. you will have to go to the original page to read more about this interesting engine.

http://www.pacificp.com/forum/viewtopic.php?t=11126&sid=1766b2420160ed8da626651e50f27459

and a whole bunch here on 2T hydroplanes http://www.quincylooperracing.us/index.html

[F5 Dave]

if someone released mild steel on the market for the first time today it would be hailed as a 'wonder product'

[jonny quest]

Frits, you must not have built any pipes. SS is much harder to weld than Ti. SS is simpler, but definitely not harder. Ti flows almost as good as solder.

[seattle smitty]

I'm assuming (titanium) you set up some sort of fixed or trailing back-gas apparatus, rather than weld it in a chamber . . . . (ditto the "wonder product," Dave!!).


Nitro is fun, cuddly stuff!:

"Nitromethane can detonate and cause serious harm to people and property. A single 5-gallon can of nitromethane
has a fatality range of 42 feet and can cause significant injury or damage at a range of 316 feet. A full 55-gallon
drum of nitromethane has a blast radius of 92 feet and can cause significant injury or damage up to 700 feet away
from the center of the blast."

One of the fun things is it's ability to auto-ignite. An occasional occurance in the nitro years of outboard racing was the runaway engine in the pits. Your boat is sitting on its stands, the motor attached and all the throttle and steering stuff hooked up and adjusted. You have blown up (pressurized) the fuel lines and got some fuel into the carburetor float-bowls (some were altered to be floatless, with an overflow). The fuel (you're using 25% "go-juice" in your methanol today) gets from the tank in the bottom of the boat up to the motor by one of three means: the tank is pressurized via a line from the crankcase (it has a check-valve in-line), or there is a crankcase-actuated fuel-pump, or there's an electric pump. You're ready to go, your heat is coming up, and you want to make sure the engine's going to run, and warm it up a little. Because of the safety rules, you haven't yet put a propeller on the propshaft. Your pal has a hand on the throttle, and you rope-start the engine. YOU should have had YOUR hand on the throttle, because you have already learned where to position it where your engine generally doesn't want to run away, and you should know that others may not pay attention to your instructions, and like to get busy with the throttle, thinking to help the engine clear out and run smooth.

You whip the rope through, the engine fires, your pal blips the throttle a couple of times, . . . and your open-pipe engine commences making an odd sound and slowly increasing rpm. Your pal drops the throttle, which in a raceboat closes the butterflies completely. Doesn't matter; nitro can provide its own oxygen. The pal quickly switches off the ignition. Doesn't matter; this is auto-ignition. If you cut the fuel supply, it will stop, but unless you have the third fuel option, an electric pump that you can turn off, the crankcase of your running engine is making its pressure pulses and helpfully supplying more fuel. Your pal madly grabs the nearest solid object, say a wooden oar, and shoves it against the side of the spinning flywheel while you madly disconnect a hose-clamp somewhere to interrupt the fuel flow. With the butterflies closed the engine has a hard time pumping, so it never makes real power or spins up very fast, but it IS unnerving!! With the float-bowls finally evacuated the engine goes quiet, and you can now hear all the nitro-users around you laughing their heads off. Been there, done that.

Now I ask you, with such delights, why would any real racing man want to burn the same stuff that his wife uses in her four-door sedan to take the kids to soccer practice?

[Grumph]

Smitty, they tell me adrenaline is brown...

You don't need nitro for that scenario. i was racing a Mach 3 kawa, came into the pits, switched off and it kept running - at about 7000rpm. Fuel off, ignition off and myself and two others start attempting to strangle it by squeezing the carb air inlet hoses. Eventually the float bowls emptied and it stopped.
Cause was plating flaking off the surface gap plugs and igniting the mixture.

Frits - one of the squeezers was my racing friend of the time - Mike Sinclair...Bet that never happened at GP level.

[peewee]

i had a methanol engine keep running full tilt one time. kill switch was pulled which should of prevented any juice to the plug but that did no good

[AndreasL]

To carry on about the fuelstories.

I now remember that we (me and a friend) tried nitro in his old Yamaha RD125 twin...just to see what would happend.
Yes, dynamite fule works and the sound of that little 125 was more like a 250 at low rpm and WOT. A "lot" of extra power.

Idle rpm? 7000-ish.
Kill switch? Dont bother.

Informative and fun experiance I almost hade forgotten.

[Frits Overmars]

There's an old saying: "Nitro does not add power. It multiplies it".

[2T Institute]

i had a methanol engine keep running full tilt one time. kill switch was pulled which should of prevented any juice to the plug but that did no good

Not entirely uncommon
https://www.youtube.com/watch?v=4Qtu8BiGIVA

[jonny quest]

Lol at guy in green eating his food like no big thing ^^^

[monkeyfumi]

Now I ask you, with such delights, why would any real racing man want to burn the same stuff that his wife uses in her four-door sedan to take the kids to soccer practice?

Probably because his balls have to sit directly behind the fuel tank...

[TZ350]

Developing a new pipe for the RG50 using the EngMod2T engine simulation software.

Ex port opens 85 atdc and 85% wide, Transfers 121 atdc and Inlet 95 btdc and fully open 15 btdc so the inlet has a period of 30 deg fully open.



The blowdown STA show 22 hp (at the crank) is possible.



So far I have only been able to develop a pipe that will make 20hp so a little bit of development to go.



TubMax end gas temperatures are below the detonation threshold.



The pipe design so far, the % lengths of header (FOS 34%) diffuser (FOS 68%) start of reflector section (FOS 76.4%) are close to the FOS concept.

[seattle smitty]

"Different strokes" Dept. (and, Admin, or TZ, if this doesn't belong here, it's fine with me if you delete it):


A Saturday evening party at a big hotel, during a two-day race weekend. A four-stroke guy is wandering around, sampling the food at the buffet tables and watching the ladies. He has also been watching a couple of 2-stroke guys, and has noticed that they always seem to have four or five women hanging around them, stroking their hair and chatting in a most animated fashion. Four-stroke-guy watches the pair until there is a momentary lull when there aren't any women around them, then walks up to them.

"Say, I've been watching you 2-stroke fellas, and you always seem to have a crowd of gals around you. I've been at this party for two hours, and I can't get any interest from the women; they talk for a minute, but then they wander off. What do you think I ought to do??"

The 2-stroke guys look at each other, then one of them lays his hand on the shoulder of the four-stroker:

"Well, big guy, you could try this: See that door over there? That leads to the kitchen where they make all of the chow for this shindig. You go ask 'em for a couple of good-sized raw potatoes. Take the potatoes, go to the men's room, and stuff them into your pants, your shorts. Then come out here and see how you make out."

"Hey, I'll give that a try!," says four-stroke guy, and heads for the door to the kitchen, while the 2-strokers snort and roll their eyes.

An hour later, there's another lull when the 2-stroke pals are momentarily by themselves, and the four-stroker walks up with a baffled expression on his face (the customary four-stroker facial expression??!!).

"Well, fellas, I tried that trick with the potatoes in my pants, but I still can't get women to talk to me. In fact, it has gotten worse, now they won't even come near me!!"

The two 2-strokers look at him, then one says, with exasperation in his voice, "Look, big guy . . . you were supposed to put the potatoes in FRONT . . . ."