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Old 05-31-2004, 10:33 AM   #11626
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Quote:
Originally posted by GlennCauley
Hi all,

I need some help figuring out an engine issue.

Serpent 710
new 2106 NovaMega SX12 3P-SS
#5 glowplug
Standard head shim included with engine
Sidewinder Fuel 20% nitro, 12% oil (old fuel from last season)
H2503 HARD .12 Adjustable Inline Shark Pipe Set

Engine has only had 4~5 tanks of fuel through it before my first race weekend, so I think it is probably not fully broken in.


Engine temp was high during the raceday, and fluctuated a fair bit during runs. Temp was anywhere in the range of 240~290C.
Engine was very sensitive to high-speed needle (HSN) changes.
We had to richen the HSN nearly 2 turns to get the temp down.
I could not make 5 minutes runtime. Even during a day of racing, the engine would occassionally seize up with the piston at TDC (due to pinch I think). I tried different plugs... no major changes.
I tried different LSN settings and idle screw settings... worked out fairly well.

The major problem I was having was during my main.
Every single time I pitted for fuel, I would go around 3 corners, and then the engine would flame out in the same spot.
I tried to rev the engine higher to stop this from happening, but it kept happening.

Some gave a tentative answer, but I want to ask around to see it if makes sense. Since the engine is still very tight and running hot, after fueling when the cold fuel reached the carb (at approximately the same spot on the track), the cylinder would contract a bit due to the sudden temp change and stall the engine.
Does this make sense?

Can anyone offer any suggestions why temp is so high, runtime is so low, and engine keeps stalling a few corners after fueling?

Please help...
Glenn, the engine could over-heat due to many reasons but certainly it would not be ready for race-tune after only 4-5 tanks. At this stage, you should still be running VERY rich around the track (i.e. as part of the break-in process if you choose to do it this way) so I hope nobody leaned it out for this race.

The engine is dying because it is over-heating. I also hope that you meant DegF above. At 290 DegF it is already too hot (imagine what the max temp is when it is actually running around). At 240 DegC I will be surprised if you haven't damaged the engine!

I think you're also running with you MaClaren shell and not a VDS Lola so cooling can also be an issue if not tuned or done correctly.
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Old 05-31-2004, 10:54 AM   #11627
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Default Re: Re: Texas Biggie 2004

Quote:
Originally posted by PSI Racing
I just read that report.
I'm glad to see Team Serpent is still doing good here in the US.
Is Ralph Burch racing at the Texas Biggie?
I didn't see his name on the list.
Is he still racing Nitro?
What company is he racing for now?
I heard he was racing for Kyosho now, but I don't think that's been confirmed.
RALPH BURCH IS RACING AT THE REEDY RACE IN CALI....
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Old 05-31-2004, 11:23 AM   #11628
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Quote:
Originally posted by GlennCauley
Hi all,

I need some help figuring out an engine issue.

Serpent 710
new 2106 NovaMega SX12 3P-SS
#5 glowplug
Standard head shim included with engine
Sidewinder Fuel 20% nitro, 12% oil (old fuel from last season)
H2503 HARD .12 Adjustable Inline Shark Pipe Set

Engine has only had 4~5 tanks of fuel through it before my first race weekend, so I think it is probably not fully broken in.
[....]
Please help...
I'm having similar problems of the engine running pretty hot - I was going to have a look at the MSN, too, to see what effect this has. One thing Rene suggested was if after richening the engine further, the temp still remains high, I should add a 0.1mm shim which would help to lower the running temp.
As my engine isn't fully run-in yet, I also asked if that was anything to do with it....he said the effect would be small.

I'll be back at the track this week to see if I can get mine sorted out.

My car would also cut out quite easily after pulling away from the pits, but I found that I needed to lean-out the bottom end a bit more to stop it from doing this - but now I've only got 1.25 turns out on the LSN As I say, I'm going to give the MSN a look to see how that affects thing.

Cheers,Mark.
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Old 05-31-2004, 01:05 PM   #11629
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Default Re: Re: Re: Texas Biggie 2004

Quote:
Originally posted by SERPENTFREAK69
RALPH BURCH IS RACING AT THE REEDY RACE IN CALI....
With which car?

Is there somewhere where we can get live updates?
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Old 05-31-2004, 01:06 PM   #11630
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Quote:
Originally posted by markp27
I'm having similar problems of the engine running pretty hot - I was going to have a look at the MSN, too, to see what effect this has. One thing Rene suggested was if after richening the engine further, the temp still remains high, I should add a 0.1mm shim which would help to lower the running temp.
As my engine isn't fully run-in yet, I also asked if that was anything to do with it....he said the effect would be small.

I'll be back at the track this week to see if I can get mine sorted out.

My car would also cut out quite easily after pulling away from the pits, but I found that I needed to lean-out the bottom end a bit more to stop it from doing this - but now I've only got 1.25 turns out on the LSN As I say, I'm going to give the MSN a look to see how that affects thing.

Cheers,Mark.
Look who just "woke" up!
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Old 05-31-2004, 01:24 PM   #11631
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Quote:
Originally posted by Sow&Steady
Look who just "woke" up!
Going to sleep soon, more like
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Old 05-31-2004, 01:46 PM   #11632
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Default Re: Re: Re: Re: Texas Biggie 2004

Quote:
Originally posted by Sow&Steady


Is there somewhere where we can get live updates?
Brandon McNally Won 200mm .12 touring with his new 710!

They are just starting the 1/8th hoping for a sweep for the Snakes.
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Old 05-31-2004, 01:56 PM   #11633
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Quote:
Originally posted by GlennCauley
Hi all,

I need some help figuring out an engine issue.

Serpent 710
new 2106 NovaMega SX12 3P-SS
#5 glowplug
Standard head shim included with engine
Sidewinder Fuel 20% nitro, 12% oil (old fuel from last season)
H2503 HARD .12 Adjustable Inline Shark Pipe Set

Glenn, could you give me an idea of how many turns out you have the LSN and HSN?

Cheers, Mark.
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Old 05-31-2004, 01:59 PM   #11634
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Default Re: Re: Re: Re: Re: Texas Biggie 2004

Quote:
Originally posted by PUNISHER
Brandon McNally Won 200mm .12 touring with his new 710!

They are just starting the 1/8th hoping for a sweep for the Snakes.
KEEP US UPDATES!!
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Old 05-31-2004, 02:55 PM   #11635
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Quote:
Originally posted by GlennCauley
Hi all,

I need some help figuring out an engine issue.

Serpent 710
new 2106 NovaMega SX12 3P-SS
#5 glowplug
Standard head shim included with engine
Sidewinder Fuel 20% nitro, 12% oil (old fuel from last season)
H2503 HARD .12 Adjustable Inline Shark Pipe Set

Engine has only had 4~5 tanks of fuel through it before my first race weekend, so I think it is probably not fully broken in.


Engine temp was high during the raceday, and fluctuated a fair bit during runs. Temp was anywhere in the range of 240~290C.
Engine was very sensitive to high-speed needle (HSN) changes.
We had to richen the HSN nearly 2 turns to get the temp down.
I could not make 5 minutes runtime. Even during a day of racing, the engine would occassionally seize up with the piston at TDC (due to pinch I think). I tried different plugs... no major changes.
I tried different LSN settings and idle screw settings... worked out fairly well.

The major problem I was having was during my main.
Every single time I pitted for fuel, I would go around 3 corners, and then the engine would flame out in the same spot.
I tried to rev the engine higher to stop this from happening, but it kept happening.

Some gave a tentative answer, but I want to ask around to see it if makes sense. Since the engine is still very tight and running hot, after fueling when the cold fuel reached the carb (at approximately the same spot on the track), the cylinder would contract a bit due to the sudden temp change and stall the engine.
Does this make sense?

Can anyone offer any suggestions why temp is so high, runtime is so low, and engine keeps stalling a few corners after fueling?

Please help...
Had the same thing with my engine I thought it was my fault by running it to fast/to lean but my bodyshell wasn't cut out proper so the engine wasn't cooled by the ridewind and got up in temp. Mine ran near the 150 Deg. Celsius so I did shorten it's lifespan but now my temps are at 100 to 115 deg. Celsius and the engine is ballistic ( or is it the car ).

Tried an other fuel with less nitro( 16% ) and more oil but it sucked big time. I run tornado 25% with no headshims in my mr 12 now and it works fine. Motor stopped eating glowplugs aswell.

Ran it for about 2 lt and the car is fantastic. Really enjoy driving this car. It improved my drivingstyle for both 1/8 and 1/10 scale fairly in the short amount of time of having the 710 ( 2 Weeks)
The only thing now is to get the most out of the car setup wise.
Ran it with the stock setup but with red springs upfront and the rearballdiff loose. Still had a slight push on turn in of throttle sometimes but the booklet is helping a lot and not only works for the 710 but for all the cars.
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Old 05-31-2004, 03:16 PM   #11636
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hi, just wanted to tell that I just got my helios and wow this thing its awesome, I still have to go through the manual, but at first glance this thing its what I was looking for . ooh and it does look very cool with the drop down thingy.
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Old 05-31-2004, 03:17 PM   #11637
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At what temps do you guys run your engines?
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Old 05-31-2004, 03:28 PM   #11638
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Quote:
Originally posted by rodrigo1508
At what temps do you guys run your engines?
For my Rody Tuned RB, at around 110 degC.

My old 5-port JP goes to about 125 DegC, maybe more
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Old 05-31-2004, 03:28 PM   #11639
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Default Hey rice...

That's a real cutie you have there in your avatar!
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Old 05-31-2004, 03:30 PM   #11640
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Default Re: Hey rice...

Quote:
Originally posted by TurnNBurn
That's a real cutie you have there in your avatar!
Obviously you're NOT talking about my avatar!
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