Craw's Racing LO206 on Alcohol

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Craw's Racing LO206 on Alcohol

Postby snd93 » Tue Feb 20, 2018 9:54 am

Craw's Racing LO206 on Alcohol with standard N/OD clutch with purple spring. Float level is set to Briggs specs. Engine almost cuts off after burnout even when I toggle and roll the car back. Any clue what I can check? I've ran a 206 before on gas and it did not bog down.

I have the biggest pilot jet in it and the air bleed 1/2 turn out and it still try’s to hunt for a consistent idle. It surges 400-600 RPMs and makes it hard to stage consistently.

https://www.youtube.com/watch?v=islVfl4nYho
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Re: Craw's Racing LO206 on Alcohol

Postby jtracr » Tue Feb 20, 2018 10:22 pm

Well being that most run the lo206 as a "spec" engine most don't run them on alky. When converted, did you put a 28mm or convert the stock carb? I have seen a few run the 28 on alky and work ok, but IMO if you had it working well on gas stick with the rules and run it on gas.
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Re: Craw's Racing LO206 on Alcohol

Postby L5 RACING » Thu Feb 22, 2018 12:32 am

First thing I would have done was to call Fred. He will help you. What's your temperatures after or before burnout. Your probably way to rich. These little motor love to be hot. Where did you get your jet kit and needle from.
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Re: Craw's Racing LO206 on Alcohol

Postby snd93 » Thu Feb 22, 2018 9:32 am

I called Fred and he said it was the clutch still being engaged after the burnout, but it isn't. Even after I toggle the switch the rpm's stay low. It has the stock carb with the alcohol kit that Craw's uses. They installed and built the engine and sent it too me that way.

I talked to Al yesterday and he told me to check the float level. I did that last night. It was a tad bit low so I raised it. I checked the needle and the clip is in the second notch from the top.

The engine also varies RPM's like its hunting. (Almost like its too lean) But I have the biggest pilot (42) that I have in it. I fired it up last night after changing the float level and it still hunts. 2600-2900 rpms. That seems too big of a swing too me.
I then pulled the alcohol carb off and put my stock gas carb on it from my back up 206. Swithched to gas and fired it up. It still hunts 400-500 rpms so I thinking its not the carb.

Temps are 220-230 before burnout. 245 during staging. Engine will run all day at 250-260 at idle on alky. 325 on gas.
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Re: Craw's Racing LO206 on Alcohol

Postby L5 RACING » Thu Feb 22, 2018 8:16 pm

I got a local friend of mine that just changed his 206 to Alky I could ask him what's his stage idle and temps at. He has not ran it down the track yet. Also in the mean time I would take the clutch off and try that.
Let's go fast and be safe at it. Thanks to Ken Dabney, TintMaster, Mike George, Wayne Thornton and Thornton Motorsports for all there help guiding me into this new sport.
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Re: Craw's Racing LO206 on Alcohol

Postby teamvortec » Fri Feb 23, 2018 8:56 am

I have only ran gas but seen others on here and some of the Facebook pages and they usually run around 170-180. TO me that sounds better since with Alky you are going to run cooler. If I remember correct on guy was running a 40 main and 137 pilot if that helps you. When you switched over to gas carb where did you set the mixture screw and are you sure that carb is clean and not stopped up?
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Re: Craw's Racing LO206 on Alcohol

Postby jtracr » Fri Feb 23, 2018 1:12 pm

Hunting idle usually is lean, lean will also be too hot. IMO the temps are too high for ALKY, at those temps fuel will evaporate before it hits the engine and cause hunting. When you first fire it before temps climb, does it hunt then? If not then it is temp causing it.
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Re: Craw's Racing LO206 on Alcohol

Postby snd93 » Fri Feb 23, 2018 4:09 pm

Cleaned the carb really well and made some more adjustments on the air bleed last night and got it much better.
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