Originally Posted by houston
(Post 7359629)
CHANGE THE PLUG!! :D
what engine is it? some run very well at the low temps and some don't, 1.5 gallons it should be broke in fully by now . if you are happy with the power delivery why mess with it ? ;) the runtimes tell me your tune is a little off though :) |
Originally Posted by mbx5rcr34
(Post 7359779)
i was thinking on this last weekend,my jx21 was 189f,i tried to lean it & i end-up 204f (empty tank) it will idle all day long ,i know my hsn is set ,is it fine to lean it more cause i remember the hsn is 2 out turns from close??already
the jx runs colder then the vspec. I had the same problem for a long time until i realized it was not a problem. One of the best drivers in my area runs nothing but jx's and he temps about 175 after a main. I think it has something to do with that oversized block or lightened cooling head. I would always try to lean it out to get it hotter, DONT! You will ruin your engine. If anything go in on your LSN but anything more then 3 1/8 is getting too lean. |
Originally Posted by (MRC)Scotty!
(Post 7359800)
No Offense intended toward psychoB4 at all, but he could be driving on the throttle a little to much too.. I've noticed I loose anywhere from 1-3 minutes depending on how hard I am driving.. Obviously the harder I drive it the lower the run time gets.. Only a few engines like the low 200 range, most are sirio based.. I run a Extech .24 on my truggy and it stays around 200 most of the time, and I get near 12 minutes w/JP6 pipe. But I have run it dry in 8.5minutes before.. I was driving really hard and was upside down more than usual..
Very true Buddy and NO offense taken. I drive my Buggy hard, and really I try to drift it around most turns. The Losi rear is so light and soft that I can throw the weight around like my drift car. thats how I been driving me buggy hahaha. But If I drove my buggy harder MRC, wouldnt that bring the temps up also?? I have to time myself this weeknd see how many mins Im getting per tank. |
Can anyone explain Venturi's and why they are used? My Engine has 2 and Id like to know why and what I can do with them. Thank you
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Originally Posted by PsycoB4
(Post 7360381)
Can anyone explain Venturi's and why they are used? My Engine has 2 and Id like to know why and what I can do with them. Thank you
everything is about air flow in these little engines. The silicon ramp, rounding off the bottom of the sleeve, the fangs on the ports etc. |
Originally Posted by dreaux
(Post 7360474)
the shape of it funnels or streamlines the air through the carb. I guess you could call it the venturi affect or something.
everything is about air flow in these little engines. The silicon ramp, rounding off the bottom of the sleeve, the fangs on the ports etc. |
Originally Posted by PsycoB4
(Post 7360478)
ok so what does me going from 8 to 7 or 7 to 8 etcc do and why does what make what faster and better. :smile::smile:
if you have a jx, speed or vspec the 7 is money. |
Smaller venturi for longer run times is right. Usually get less power too, but your track usually determines what venturi you want to use. Sometimes even makes you faster if you don't control throttle trigger as smooth as you should LOL.
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Originally Posted by Cadimman
(Post 7360540)
Smaller venturi for longer run times is right. Usually get less power too, but your track usually determines what venturi you want to use. Sometimes even makes you faster if you don't control throttle trigger as smooth as you should LOL.
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Originally Posted by PsycoB4
(Post 7360618)
Now if you change the Venturi, do you have to Re-tune the Engine? Since you are drawing more or less air?
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Originally Posted by PsycoB4
(Post 7360618)
Now if you change the Venturi, do you have to Re-tune the Engine? Since you are drawing more or less air?
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Originally Posted by JAMMINKRAZY
(Post 7361238)
Yes you will have to re-tune. That is in fact the purpose of a venturi. Running a smaller venturi will require a leaner setting, thus it will give you better runtime. The smaller the venturi the better the runtime, but the lesser the top end of the engine(bottom end is not affected much). If you find you can sacrifice a bit of top speed, running a smaller venturi will get you more mileage.;)
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Originally Posted by PsycoB4
(Post 7361302)
thank you sir
Edit: Never mind I see you are running the OD engine and JP-4. I would think a 7mm should be plenty in a buggy. |
Originally Posted by JAMMINKRAZY
(Post 7361356)
Not a problem. Which engine are you running? What are you running it in? What general size are the tracks you are running on? What pipe are you running?
Pipe I have the ofna 086 or the Jp-1, just bought the Dynamite 007ht was told it was the same as the jp-1... Buggy is a losi 2.0 and track size idk normal? 30-40 sec laps |
Originally Posted by PsycoB4
(Post 7361365)
Right now I got the OD SS .21 I think it is Superb. Very Smooth And easy to tune. Love it! 1.5 gallons and runnin strong 200F 206 max so far.
Pipe I have the ofna 086 or the Jp-1, just bought the Dynamite 007ht was told it was the same as the jp-1... Buggy is a losi 2.0 and track size idk normal? 30-40 sec laps |
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