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Old 02-12-2007, 06:34 PM   #16
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Its an ok amount I cant really tell inside but when I take it out... BLUEEE !!! and theres fuel spattering out the exhaust...I could tell by the resedue on the body!!!!! Not as much fuel as before ,, but Im pretty much through breakin it in and the pinch is amazing!! It lacks a little on punch but that could be my slipper I had it 5 turn on breakin think Ill move it to 3 now..
Already retightened my diff. Also top end at WOT passes stutters a little topping out.. Suggestions?
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Old 02-12-2007, 07:56 PM   #17
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bump!
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Old 02-12-2007, 09:22 PM   #18
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If I richen it more it bogs upon throttle! So I left it there.. Refer to the post above this one for more info any suggestions will be greatly appriciated!
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Old 02-13-2007, 01:02 AM   #19
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I don't know if the RTR slipper is any different than the kit slipper, but five turns out sounds about right.

If your truck is spitting fuel out of the exhaust, and accelerates hard but bogs on top....that sounds like it might be too rich. It doesn't cut out and then surge over and over again, right?
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Old 02-13-2007, 08:32 AM   #20
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Right! Top end bogs but it is way strong through mid range... only when it tops out it blaaaahhhs a little!!!
And it Idles kinda high when I pull back up and temps are in 230 to 245 range after a few WOT passes
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Old 02-13-2007, 08:42 AM   #21
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Aaron is right, especially if raw fuel is spitting out of the exhaust. I don't know much about the .15 sized engines, is 240 temps normal, depending on where he is measuring at?

The best thing I was told to tune for was to get that nice trail of blue smoke, but no raw fuel spitting initially and go from there. and always set that HSN first.

There is some good tuning info I believe on a few of the magazine websites.
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Old 02-13-2007, 09:01 AM   #22
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I set it by my HSN At IDLE, this is when I see the fuel coming out my pipe....when I reach 180 degrees I take it outside put it on the ground and blip the throttle around for a few and pull it up by that time tempsmove to 200 or so ,,,,Then I throttle it a little wilder running a few medium to WOT strait passes at about 35 feet then come in the temp will be 225ish and I do it again and pull it in to check anditll be 235 to 240 ish....
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Old 02-13-2007, 11:11 AM   #23
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Trying to remember here the way I did it. Easier with my cheat sheet in front of me. If I remember correctly, there is a pinch test you can do to set our LSN correctly. I believe you pinch the fuel line and you should hear the engine rev up gradually for I think about 5 to 10 seconds (its one of the two). If it revs up right away, I believe that means its set too lean.

When in doubt, the factory settings are always a good way to start over.

Also, do you notice any bubbles in your fuel line?
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Old 02-13-2007, 11:43 AM   #24
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I do recall seeing one or to tiny bubbles but they go away.. Factory settings wont let it start I read aout it a little on most carbs 3 for the HSN and 1 1/2 turns from flush on the LSN right now I set 2 1/2 HSN and 2 21/4 LSN from closed... How is the Idle supossed to sound RPM wise the way I have it If I turn it up any more it will want to move should I Idle it down a little?
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Old 02-13-2007, 11:57 AM   #25
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Aaron is probably going to help you more with that.
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Old 02-13-2007, 12:22 PM   #26
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Well I appreciate you giving it your all man thanks!!
All I really need to know is what a good Idle temp should be cause maybe my Idle temp is to high causing the temps to rise fast after a few passes!!
my take off isnt quite there and bogs a little on high end!
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Old 02-13-2007, 12:23 PM   #27
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There is no "most carbs should be close to..." setting. The old Picco .12 carbs were sometimes less than two turns out, the MGT motor (I think) the LSN is five turns out, etc. All carbs are different, all engines are different. Don't pay any attention to wives' tales like that.

At the same time, some fuels don't produce much smoke. Tune for sound and performance, not for smoke or smell or anything else.

If your engine is very strong from low rpm through the midrange and then bogs on top, it's gotta be too lean. Temperature doesn't mean much at that point; if you're not letting the engine warm up for a good five minutes of easy running up and down the street, it could lean-bog at 170 degrees, haha. Run your truck for a few minutes to bring the engine completely up to temperature, and make sure there's fuel in your tank (not running close to empty) before you start making adjustments.

Speaking of temperature, unless you're using an Exergen (or one of those little Tempgun.com units) don't even worry what the numbers say. Some tempguns are so far off it's scary. Use a water dropper or dab some spit on the engine head. If it sits there and sizzles, your engine is in the 210-220 range. If it instantly jumps off, it's hotter. If it sits there and hangs out, it's probably 200 or lower.

If the engine is sputtering and blowing smoke and fuel at WOT (hence the bogging), then you need to lean the HSN. That wouldn't explain why the engine runs crisply through the rest of the RPM range though. If your HSN was too rich, it shouldn't accelerate very hard.

The LSN trick with the fuel tubing: pinch the fuel tubing leading to the carburetor while the engine is idling. After 7 seconds or so, the idle should start to climb. If it idles up immediately, you are too lean. If it sits there and runs for a long time, you're too rich. This method isn't very scientific, but it will get you in the ballpark.

Idle can be subjective. Technically, your idle should be set at any point lower than when the car starts to creep forward. Personally, I like my idle so low that the engine is about to die...haha.
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Old 02-13-2007, 01:25 PM   #28
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do you think that the 240 to 250 mark is to hot?
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Old 02-13-2007, 01:33 PM   #29
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"Too hot" is subjective.

1) The engine should be able to withstand that temperature.
2) 240-250 with a too lean LSN and too rich HSN will hurt the motor.
3) Depending on your temp gun, those numbers might be WAY off.
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Old 02-13-2007, 01:46 PM   #30
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great info there Aaron. Didn't know there are some fuels that don't really throw off smoke. I use Byrons exclusively as its one of the best.

By the way Lowgeared, what fuel are you using? I had a heck of a time trying to tune an engine when using a RTR style fuel. Just wouldn't hold a tune.
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