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Author Topic: Nitromethane  (Read 4913 times)

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Offline trappermike

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Re: Nitromethane
« Reply #50 on: September 21, 2015, 02:43:46 pm »
I experimented with Nitro in my 084 Hotsaw back around 1988.I was running 25% nitro with Methanol,and Amsoil mixed with it fine at 32-1. I found I really had to upgrade the fuel system for far higher flow,and had to make large increases in the fuel circuits in the carb.I also installed an NGK B9HV spark plug. Finally after increasing the fuel flow and carb circuits I got the saw so the carb adjustment screws were funtional and I could set the carb ok. Results were suprising,The saw ran great,and very cool,but always after about 60 seconds running the saw would auto-ignite and be running without the ignition(Not abnormal),so it would race and not idle down,but when you opened the throttle it carbereted fine,so I didn't worry about the racing,it pulled very hard thru the wood. Then came the trick to stopping the motor.Turning it off did nothing,first time in a panic I yanked the plug wire off to no avail,the saw stayed racing,finally I learned to turn the motor off by closing the choke and opening the throttle,worked every time.
Well after all the hard work I found that nitro was illegal in my hotsaw so all my work was in vain for that class of racing...
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Offline aclarke

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Re: Nitromethane
« Reply #51 on: September 21, 2015, 03:08:40 pm »
If you have an effective de-compression button, that will kill the motor too
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Offline trappermike

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Re: Nitromethane
« Reply #52 on: September 21, 2015, 03:16:59 pm »
I forgot to mention,very important,after every running,I drained the nitro mix out of the saw and ran a normal gas/oil mix thru the saw as soon as possible,and left some in. Nitro and alcohol will eat rubber and other things quickly.
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Offline Cut4fun .

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Re: Nitromethane
« Reply #53 on: September 21, 2015, 03:17:19 pm »
I remember having a runner run on at KY.  Nothing was killing it.    Freaked me out but somehow got it killed. Cant remember  how.

At Webster I noticed all the top guys running over with their prime bottles to flood out the saws that were running on.
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Offline Cut4fun .

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Re: Nitromethane
« Reply #54 on: September 21, 2015, 03:18:21 pm »
Quote from: trappermike on September 21, 2015, 03:16:59 pm
I forgot to mention,very important,after every running,I drained the nitro mix out of the saw and ran a normal gas/oil mix thru the saw as soon as possible,and left some in. Nitro and alcohol will eat rubber and other things quickly.

Yep always had a flush fuel for after racing. Would run it till saw bogged down then drain.
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Offline mdavlee .

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Re: Nitromethane
« Reply #55 on: April 26, 2016, 10:37:31 pm »
Finally have started playing with this nitro stuff. Had to add a little pump gas to get it to run and not run away. This was 15% nitro rc fuel and 91 e free 50/50.

https://youtu.be/dYim7Cy77pE
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Offline oldpro

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Re: Nitromethane
« Reply #56 on: November 23, 2016, 11:30:16 pm »
Well I ran 25% nitro and alky in my 084,it took a lot of work to get the fuel flow needed,I got it to run excellent and then found it was illegal here.

First of all if you ran nitro how did you get the motor to stop?
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Offline Cut4fun .

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Re: Nitromethane
« Reply #57 on: November 24, 2016, 11:38:56 am »
Held the switch in or just flipped switch off  99% of the time worked. If had a run on flood it with mix squirt bottle or plug the carb hole. 
You can see folks in the videos running with squirt cans to a run on saw of a racer.

Know of 30% in stock appearing saws.  My 4ci cube liked that best. But I was one to try and just run the same 12% or so in all the same saws.  Had like 8 ingredients in my sprint mix from Va. Called Nitrodine.
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Offline mdavlee .

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Re: Nitromethane
« Reply #58 on: November 24, 2016, 08:57:09 pm »
They can run away. I had to hold the decomp in and pull the trigger to let it die once. Switch off and it still was running away.
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Offline Cut4fun .

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Re: Nitromethane
« Reply #59 on: November 25, 2016, 10:07:33 am »
Had a run on on the 4ci at the Murray KY show after the cold start and 3 cuts  :o. Was fun trying to get her shut down.
Makey one poop-po their pants alittle.  :D
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