OK, First off, I have been working with this alky thing for over a year now. Last year I had it dialed in pretty good, then winter came, and it was just impossible to get jetted properly.
Since that point in time, I have forgotten what I had jetted it at, and of course I never wrote it down either.

I still have all my old jets, but they were jets of which I drilled myself, and once again never wrote down their sizes.
I lost my numbered bits, so I can't even measure what they would be. So this is gonna be a game of higher and lower, instead of numbers. Kinda like cards..lol

First problem....I had it running awsome the day before yesterday in the garage. It started right up, reved freely, and no bad bogs that I noticed. Then 18 hours later, I went back at it, and the thing would not start for the life of it....Just about wanted to, but wouldn't. When it finally did, it sputtered a bit and wouldn't idle quite right at all. Playing with the air fuel screw didn't seem to make it any better, although I was able to make it worse going in both directions, so I know it's in the ballpark.
The needle is a 95, and in the richest position. the main is drilled out to be even with the opening.... meaning no ridge inside the jet itself.... The pilot is close to the biggest I could drill it without losing the tip if you know what I mean. Air fuel screw about 1 and a half turns out.
When I rode it, it seemed to rev nicely, with a noticeable power increase....but would backfire a bit upon deaccelleration. More so at lower rpms. After holding it open for a length of time, it lost all power, like it was starving, so I modified the petcock to allow more fuel. Will see if that works today.

So basically, with a backfire on the down rev, this indicates to me lean?? And If so, it seems I'm pretty much up there in jets as it is... I'll be more certain today.

Next thing is nitrous....If you need double the alky as gas for a rule of thumb, would you then need to double the size of fuel jet in your fogger too? With gas, if I wanted to increase 1 jet size for gas, I'd just go up 1 nitrous size and up one fuel size.....now for alky it would be up 1 nitrous size, up 2 fuel right? Hopefully I'm richer than not when I fire it the first time on alky....lol It's a NOS fogger system, if anyone else is running this setup with alky, what jets are you shootin?

Last but not least, Whats the easiest way to transfer N2O from my bigger bottle to my little one? Seems as it is now, I can only get about 700 PSI in it, but then again neither are at 90 some degrees either.. Just a thought I'd be interested in looking into.

Hiopefully this isn't too much for you guys... (the rambling) and someone will be able to help out.
Thanks again

 

What carburator are you using?

 

Sorry, I thought my sig was updated, but I remember after I did all that work, Some kind of error occured and I lost it.

I'm running the TM45, ported intake, Head porting, 13_1 comp piston, Nitrous (haven't shot it on alky yet), airbox removed, Uni filter on the end of the intake tube, Oh and this is probibly important as well....I do have an Air Fuel guage installed, but from the looks of things I'm almost off the charts lean or it doesn't read the same with alky as it does gas. The latter I would presume. Also running the yoshi slip on....stock cams and valves.....manual tensioner....etc. etc. I think thats more than enough to get what I need.

 

TheChosenOne I'm only going to give you general answers to your questions.
As far as jetting goes, you sound lean to me. What do the plugs show. If the plugs show white your rich. If they look dirty, your lean with alky.

As far as nitrous goes. You can't double the size of the jet because of Pi. You want to double the flow of the jet. I personally would not screw with this. Just call NOS up and ask some questions. If your off just a bit with your fuel pressure your going to burn it up. I would just call NOS up and ask them point blank what fuel pressure to run and what jets to run. Then set it and forget it.
BTW, you can make more power if you run a nitrous system on gas while your engine runs off of alky. Then again you need a dedicated tank and fuel system to do this.

As far as the tank thing goes. Freeze the little tank over night in a freezer. Get the big tank as hot as you can by either putting it in the sun or do the hairdryer trick or whatever.......... I usually did nothing and it was fine. Put the large tank up high and the little tank down low and turn on the valves.

Hope this helps a little.
Presssure mean nothing. You need to weigh the tank while empty. Put it on a scale and fill the tank to the tank weight + the nitrous weight. In other words, if your 2 1/2 lb tank weighs 5lbs empty; put in on the scale and fill it to 7 1/2 LBS total.
DON'T GO OVER THIS WEIGHT. YES, YOU CAN, BUT DON'T!!!!!! If the bottle gets in the sun you will be in for a big suprise if the bottle pressure goes above the rupture disk rate!!! [img]i/expressions/face-icon-small-shocked.gif[/img]

 

I guess it never dawned on me to call NOS directly. Thats probibly the best bet all around. Thanks for enlightening me. I just got back from a little tear..... Before hand I upped the pilot jet size to another unknown size.....but bigger is the main thing....and it seems to idle a bit better, and a little less bog. I am still experiencing the slight popping when slowing down, mainly shortly before it reaches idle when gearing down. I'll have to try a size bigger on the main and see what it does. overall, it runs pretty decent so far, and I think it won't be long before it's dialed in spot on. I am using a strawberry scent as well as redline top end alky lube. Still makes ya dizzy if you aren't careful with the garage door...lol

Any input on the air/fuel guage would be appreciated if there is any.... But for now I think I might have another problem to combat.....seems like my thermostat isn't working as it should or somethng, as My colling system appears to be pressureing up and forcing a leak from the hose connections on the rad. And yeah they is tight....Something doesn't make sense, a closer examination is in order.
Thanks

 

Good thread guys.

As far as the air/fuel meter, if your meter is a wideband you should still be able to use it with Alky. The stoich for methanol is 6.47 and ethanol is 9.00 however you can always use lambda for any fuel combo, mix, blend etc. A good power lambda would be .82-.85 whereas stoich has a lambda value of 1.0. I am not sure what a/f meter you have, hopefully it will give you lambda readings.

 

Lamwhadda? lol...I think I follow. Mine is a Faze multi LED guage, and I'm using a single wire (i know.....) bosch wideband o2 sensor. The LED's can be converted to a voltage reading, and that will tell me...