ESE's works engine tuner

**F5 Dave** · 12th July 2009, 18:44

Yeah I've had my project one on breadboard for 14 years. Even made the gear linkage switch & a charge pump so no battery reqd. Filed under 'one day when there is less important things to do'.

**Skunk** · 12th July 2009, 20:01

Too many project huh Dave?

**F5 Dave** · 12th July 2009, 21:14

Too many projects & not enough arms that work atm.

**TerraRoot** · 13th July 2009, 06:40

More info on DI.

Since the most popular DI bike i can get my hands on is a aprilia sr50, i went a searching there. and found a whole sub forum doing the megasquirt thing
http://www.scooter-freaks.nl/forum/s...d.php?t=274376

okay it's only a 50, but i can't find any bigger ADI injectors anywhere, so maybe just double or triple up on 50cc injectors? arrange them around the standard spark plug and use one big air pump and fuel pump.

All the technology is out there and tested except for the ADI injector and the need to make a need head to house the spark plug and injector. easy eh?

**TZ350** · 13th July 2009, 10:20

Originally Posted by TerraRoot

All the technology is out there and tested except for the ADI injector and the need to make a need head to house the spark plug and injector. easy eh?

Please keep us posted as your project with the DI progresses.

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**TerraRoot** · 13th July 2009, 10:35

sorry if im sounding like an arm chair engineer.
just want to pick other peoples brains on how they would do it

**TZ350** · 13th July 2009, 15:27

Originally Posted by TerraRoot

sorry if im sounding like an arm chair engineer.

New ideas and arm chair engineering its all good, all interesting and DI and the engine management that goes with it, I think is an interesting idea with potential.

Sorry if I mis-read you, I was becoming concerned, that DI was about to be promoted (pushed) as an idea that Team ESE should pickup.

From experiance I know the time and effort it takes to make even the easiest idea work.

And even with DI you still have to get the air into the cylinder using all the familiar 2-stroke tuning techniques. From what I can see, the DI bit just cuts down on wasted fuel but has some potential for cooling the piston crown.

For performance, cooling the piston crown is a good idea, and worth looking into, I will certainly look into it some more myself.

Its all good, many thanks TerraRoot for your input. Team ESE.

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**TZ350** · 13th July 2009, 19:34

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More on cooling the piston crown and a little off topic.

Water is too brutal to squirt onto a hot piston crown, it causes the alloy to fracture. But in the past I have toyed with the idea of injecting nitromethane to cool the piston crown. I was going to squirt it up into the underside of the piston from below.

I figured the liquid nitro would hit the hot underside of the piston as it descended and opened the transfer ports. As the liquid nitro burst into vapor it would cool the underside of the piston crown and the vapor pressure would help eject the airfuel mixture out of the crankcase and up into the cylinder.

I reasioned, that with the motor tuned to run correctly on petrol in the ordinary way, adding nitro, as nitro is 48% oxygen 52% fuel there would be no problem as it would make the motor run slightly richer and hopefully stronger.

I did try this out once, it made the motor run hotter suggesting more power but strangly it wen't no faster. The good thing was it did not blow up so I was right about the mixture. I am not sure why it did not run stronger, maybe an ignition timing thing or compression issue. Just out of curiosity I would like to get back to it one day and get it right as I have always wanted to run a Bucket at speed around a long track like Pukekohe.

If anyone else has experimented with using nitro as a chemical supercharger in a 2-stroke I would be interested to know how it worked out.

DI and nitro could have real performance possibilities.

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**TZ350** · 13th July 2009, 20:46

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A link to the Mega Squirt manual that TerraRoot is talking about. http://www.megamanual.com/index.html

Looks interesting, could have possibilities.

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**speedpro** · 13th July 2009, 21:32

Nitro is lovely but stuff does go bang. Actually it goes BANG. I remember yakking to John Boyle about it years ago and he reckoned 10% in alcohol smoothed the idle and generally made all sorts of improvements. Nitro doesn't mix with petrol I think. There was a small rail years ago at Thunderpark that used to start on alcohol and switch to nitro. You could hear the change in the exhaust note. Robert Holden rode Bob Brown's(I think) Ducati on a Methanol/Nitro mix. Made your eyes water and your nose sting.

**TZ350** · 13th July 2009, 21:53

Nitro will mix with petrol but the problem is nitro does not like a lean situation at all and will detonate at the slightest hint of leanness and petrol does not like to be run too rich so its a difficult balancing act running a nitro/petrol mix. But methanol/nitro is much easier to use as methanol loves to be run rich.

My method was to not mix the nitro and petrol directly but to set the bikes carb up on a generous petrol setting by itself so the motor was running on the slightly rich side of the correct air/fuel ratio for petrol. Then to squirt nitro in as an extra. Nitro carries slightly more fuel than oxygen so when it is injected the motor richens up even more. Being richer than it really needs keeps things safe.

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**TZ350** · 13th July 2009, 22:06

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Nitro is a slow burner so you need extra advance. This slow burn is why you see the top fuel dragesters flaming out the exhausts.

To speed the burn rate up you can add hydrazine (Now Banned). The correct amount is 1/4 of 1% add 2-3% hydrazine to nitro and you have a very explosive mix.

Pic-1 a 60's rail dragster.

Pic-2 is what happens when you add to much H. Hydrazine The Doomsday weapon of the sixties.

The attached image is a Top Nitro Fueler staging. Thats big time Nitro, don't you just love it.

Yes, one day I will get back to trying nitro in my Bike again, just for giggles mind.

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