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Old 12-03-2007, 06:42 PM   #1
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Default Engine dies

Once I get my mach 427 started I'll let it warm up. After about 2min. I try to give it gas and it dies. I restart and drive it with no problems and good temp readings. I'll bring the 8T back in and let it just sit and idle. When I try to go again it will die. Does this mean my tune is off? Or maybe to much gas is sittin in the engine or carb causing it to die? Thanks for any advice
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Old 12-03-2007, 07:06 PM   #2
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probably a lil too rich on the bottom ,
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Old 12-03-2007, 07:12 PM   #3
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Originally Posted by houston View Post
probably a lil too rich on the bottom ,
So I should just adjust the low end a little leaner? Sounds good. Thanks Houston. It seemed odd but is running so well. The beauty of fine tuning
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Old 12-03-2007, 09:39 PM   #4
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i think the low end is a little rich... you can left it as it is as a little richer on the low end saves the bearings... lean bottom is usually the one that kills engines...

some clarification first... how long did you leave it to idle? if it's like less than 20 secs, then should lean down the bottom end, or turn in the idle screw a little...

did you full bore the engine just after it idles? i'll blip the throttle if it idles for a while to clear the engine....

2 cents...
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Old 12-03-2007, 09:56 PM   #5
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It sounds as if the bottom is a little on the rich side. Lean the bottom out about an 1/8th of a turn. Then run the car, clear it out and let it sit for about 8-10 seconds. Once it has set for 8-10 secs floor it, if it goes but bogs then lean it another 1/8th. Then try it over again. After sitting for about 8 or so seconds and you floor it, the car should come off of the line pretty strong but not insanely. This should pretty much get you in the ballpark. If you need more help you are more then welcome to PM and I will answer everything that I can.
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Old 12-03-2007, 11:32 PM   #6
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Thanks Black and Maikaitan. I'll try it as soon as the rain stops. Maybe march I live in Portland OR. No indoor tracks here.
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Old 12-04-2007, 08:01 AM   #7
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Yeah... what Black said. Note that MOST buggy engines (when tuned properly) won't idle well for more than about 8-10 seconds. If it idles "forever" and you aren't idled up too high, it is probably too lean on the bottom. After about 8-10 seconds it SHOULD start to load up (with too much fuel, i.e. flood...) For some reason though the RB engines are the exception to this... I don't know about yours, I'm not familiar with that engine.

If you have it set lean enough on the bottom to idle for a long period of time, you won't be able to get the top lean enough for peak power without getting the temps too high! It is all a compromise.
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Old 12-04-2007, 11:02 PM   #8
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hey jg who are you ? i live in portland and a very well known racer in the area , maybe i will hook you up with a tune and some advice when we meet !
later , monty
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Old 12-05-2007, 06:22 AM   #9
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Quote:
Originally Posted by Maikaitan View Post
i think the low end is a little rich... you can left it as it is as a little richer on the low end saves the bearings... lean bottom is usually the one that kills engines...
I dont know if i agree with that.. simply because, an engine with a fatter bottom, has too much
fule in the crank, causing the piston to have to compress more fuel than optimal, means more wear on the parts.. it is better to have a slightly lean bottom end, and a slightly rich top end.. simply because you are rarely on the low end needle enough to really cause alot of damage.. as soon as you get bout 1/8th pull on the trigger.. you move off the bottom end needle, and the top end/mid takes over..
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Old 12-05-2007, 06:27 AM   #10
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direct from the Sirio website

Normally you will not damage your engine if you are running with:
the high speed needle valve set TOO RICH and
the low speed needle valve set TOO LEAN

The opposite can be very dangerous for your engine
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Old 12-05-2007, 09:28 AM   #11
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Quote:
Originally Posted by dgrobe2112 View Post
direct from the Sirio website

Normally you will not damage your engine if you are running with:
the high speed needle valve set TOO RICH and
the low speed needle valve set TOO LEAN

The opposite can be very dangerous for your engine
Thanks for that input
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Old 12-05-2007, 10:43 AM   #12
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Read this article by the late Ron Paris. It's an excellent paper by one of the best engine tuners in the world....
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Old 12-05-2007, 11:00 AM   #13
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Originally Posted by SkarTisu View Post
Read this article by the late Ron Paris. It's an excellent paper by one of the best engine tuners in the world....
Very good article. I will keep this in my file from now on. Thanks StarTisu
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Old 12-08-2007, 04:27 PM   #14
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Quote:
Originally Posted by houston View Post
hey jg who are you ? i live in portland and a very well known racer in the area , maybe i will hook you up with a tune and some advice when we meet !
later , monty
Houston, hey it's JG. I PM'd you a few days ago. I live in Gresham. PM me whenever
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