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Old 04-22-2004, 10:32 PM   #676
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Dino,
I want to try the off road .21 buggy engine. Where can I buy one? Thanks for the PM, dude.
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Old 04-23-2004, 02:35 AM   #677
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Quote:
Originally posted by au_Nightmare
No, the first few laps the engine should be slugish and as if its too rich, as it heats up it becomes ALIVE...

Those temps you have a way too hot, what is performance like? I would richen needles.

Here is info from earlier messages.


BTW - I had air leaks from moving fuel inlet on carb (me naughty) Have you touched this?
Hi, the engine parts are un-touched. The performance of the engine is good, but as I said, the temperature is way too hot and this is before the engine is under load .. (mainly idle and low throttle)

I haven't had a chance to run the engine today, but I'll richen the LSN as Dino suggested and see what difference that makes..

It still does not sound right though? That's way too hot even for the current settings which is 4 HSN, 4 LSN..
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Old 04-23-2004, 03:00 AM   #678
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I had air leaks when I has having problems and my needles where richer then the 4/4. If I ran 4/4 it just sounded lean, I never let it run long enough to heat it to see how hot it would get . Now air leaks are fixed (my fault) everything is sweeeet

If performance is good from the second you start I would say you are running lean for sure..
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Old 04-23-2004, 05:01 AM   #679
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Quote:
Originally posted by au_Nightmare
I had air leaks when I has having problems and my needles where richer then the 4/4. If I ran 4/4 it just sounded lean, I never let it run long enough to heat it to see how hot it would get . Now air leaks are fixed (my fault) everything is sweeeet

If performance is good from the second you start I would say you are running lean for sure..
No I didn't say the performance is good from the start. This is not my first engine.

Other than air leaks, are there any other possible reasons for this?
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Old 04-23-2004, 07:21 AM   #680
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Quote:
Originally posted by GUNPOWDER
No I didn't say the performance is good from the start. This is not my first engine.

Other than air leaks, are there any other possible reasons for this?
Clogged carb. Carb not tight. Main needle seat not tight. Junk in the main needle.
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Old 04-23-2004, 08:17 AM   #681
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Quote:
Originally posted by au_Nightmare
No, the first few laps the engine should be slugish and as if its too rich, as it heats up it becomes ALIVE...

Those temps you have a way too hot, what is performance like? I would richen needles.

Here is info from earlier messages.


BTW - I had air leaks from moving fuel inlet on carb (me naughty) Have you touched this?
how about 40C ambient temp,... my D5 runs at 113C (almost constant) currently
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Old 04-23-2004, 08:43 AM   #682
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Quote:
Originally posted by dino.tw
Ok,let's compare it with D5.
Both of them are 5 port.
D5 is 2.1cc only but D21B is 3.5cc with huge torque.
D5 has 6.5mm carb. but D21B has 8mm carb(w/8mm venturi)
BUT,D21B will cheaper than D5....damn...the touring engine is really too expensive...
me want some,... me have hunger for "economical" engines, hehehe...
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Old 04-23-2004, 06:35 PM   #683
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Quote:
Originally posted by GUNPOWDER
Thanks Dino,

Does this mean it's ok for the engine to run around 140-150C in the first few laps but then it'll cool down.. Because my problem is excessive temperature even when the engine is idle or there is not much load on it..

Engine is fully run in. Removing glow plug and turning engine over by hand also feels right.
there are some possible...
1)Air cooling not well
Your body don't have air cooling hole or not enough big. you can try to run without body for a while,and if the temp is much different,that is the reason.

2)There is any air leak...
A leaking engine will lose some power,that will cause you to over lean your engine to get enough power. Check your engine;pipe's gaskets;pressure line;fuel line...If there is any laek,fix it.

3)Tyre is too small...
When the tyre is too samll,your engine will rev more hard. And more easy to over rev. It always happen on 1/8 car. A small tyre also let your car run slower and less grip. When you feel it slow,you will want to lean it....

4)your pipe is not match with your engine
the pipe has deformity or leak also will cause your engine over heat.

5)bad fuel
A bad fuel also will let your engine run not fine.

clutch has fault;bearing has fault;.....etc.Too many possible....
Make a comprehensive survey of this question. When your car is slower than others,then your engine may over heat even blown off because the first thing that you think of is to lean the main needle.....
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Old 04-23-2004, 06:38 PM   #684
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Quote:
Originally posted by orangbaligila
how about 40C ambient temp,... my D5 runs at 113C (almost constant) currently
40C

throw away your R/C equipment and go to swim.....
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Old 04-23-2004, 06:43 PM   #685
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Quote:
Originally posted by TambokGT
Dino,
I want to try the off road .21 buggy engine. Where can I buy one? Thanks for the PM, dude.
If your hand is fast,you can get the first batch from Geoff at RCX. Not much quantity as I knew. And maybe come with a pipe....
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Old 04-23-2004, 09:08 PM   #686
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Quote:
Originally posted by dino.tw
there are some possible...
1)Air cooling not well
Your body don't have air cooling hole or not enough big. you can try to run without body for a while,and if the temp is much different,that is the reason.

2)There is any air leak...
A leaking engine will lose some power,that will cause you to over lean your engine to get enough power. Check your engine;pipe's gaskets;pressure line;fuel line...If there is any laek,fix it.

3)Tyre is too small...
When the tyre is too samll,your engine will rev more hard. And more easy to over rev. It always happen on 1/8 car. A small tyre also let your car run slower and less grip. When you feel it slow,you will want to lean it....

4)your pipe is not match with your engine
the pipe has deformity or leak also will cause your engine over heat.

5)bad fuel
A bad fuel also will let your engine run not fine.

clutch has fault;bearing has fault;.....etc.Too many possible....
Make a comprehensive survey of this question. When your car is slower than others,then your engine may over heat even blown off because the first thing that you think of is to lean the main needle.....
Thanks Dino, perfection as always.. I'll be testing these on the weekend...
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Old 04-24-2004, 08:17 AM   #687
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Hey Dino,
Smitty callin'! Remember me? Anyhow, when are you going to make a Competition .21 On-road race engine?
We are racing 1/8 scale now, drunk with speed if you know what I mean?!!
Thanks,
Smitty
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Old 04-24-2004, 03:12 PM   #688
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Quote:
Originally posted by smitty
Hey Dino,
Smitty callin'! Remember me? Anyhow, when are you going to make a Competition .21 On-road race engine?
We are racing 1/8 scale now, drunk with speed if you know what I mean?!!
Thanks,
Smitty
If you go back a few pages Dino talked about it and put a pic but there still testing
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Old 04-24-2004, 05:51 PM   #689
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I saw that, but that is an Off-raod engine, not really the same.
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Old 04-24-2004, 06:09 PM   #690
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No, it was a on-road engine (I dont remember a photo but?). From memory he said ATM they are having carb problems, its back there go have a look/search

umm here is one
http://www.rctech.net/forum/showthre....21#post814426

Last edited by au_Nightmare; 04-24-2004 at 06:15 PM.
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