ESE's works engine tuner

[husaberg]

Large pilot jet did not help.
Large main jet did not helped either.
The engine run rich for the first two laps, then really good for four laps,
but the race ended on the sevent lap.

In March 11 1995 - I promised to the 'GOD of POWER' to never ever again
racing with a fan cooled engine.

Whats the class fuel rules?

[Viking]

Whats the class fuel rules?

Pump gas - unleaded.

[wobbly]

Sadly I have absolutely no compassion for you what so ever.
There is absolutely no excuses for that to happen, if its mad rich everywhere, then another element of the tune is 100 Km away from being optimum.
You only have fuel, ignition and timing to look at.
That amount of detonation would have dropped the EGT a huge amount, you could have easily stopped before it created havoc if you were watching the gauge connected to a fast probe.
Tough love buddy.

[Viking]

Sadly I have absolutely no compassion for you what so ever.
There is absolutely no excuses for that to happen, if its mad rich everywhere, then another element of the tune is 100 Km away from being optimum.
You only have fuel, ignition and timing to look at.
That amount of detonation would have dropped the EGT a huge amount, you could have easily stopped before it created havoc if you were watching the gauge connected to a fast probe.
Tough love buddy.

I have no compassion myself for me. The race was the last for the season,
in a support class for a competiton in European Championship,
so nothing to lose for me as my Swedish race season was already over.

I raced the engine the whole season without any trouble.
In winter time the ambient air temperature is -10°C or lower, and includes snow-smoke, that gave enough cooling.
The race in springtime of March had air temperature of +10°C with no snow particles in it.
It´s a two cylinder engine, with the cooling fan on the right side blowing diagonally
over the heads and trough the cylinders fins.
Airflow around the left halves of head and cylinder on the engine left side are limited.
The overheated piston shows the main damages diagonally on the left side.
The right cylinder piston of the engine has no damage at all.

I only use EGT during testing, never in race events.
It did not came as a surprise, I knew that the warm weather would be a problem for my engine...

[husaberg]

Pump gas - unleaded.

What Wob said, but Does your rules allow for e10 or suchlike?
Alcohol buys you leeway both in tuning latitude as it tolerates mixtures being ballpark as long as its over-rich, its also very forgiving into adding lipstick to a thermal pig that a AC2T engine is.

If it this class they are a bit more open than you may think

24-25 International Snowmobile Racing Rules Copyright 2024 VINTAGE OVAL RACING COMPETITIONFUEL REGULATIONS
NOTICE: It is advisable for all competitors to have their fuel tested at the event, before competing.
1. A contestant appealing a fuel disqualification must bear the expense of the fuel analysis and handling.
2. Allowed gasoline and lubricants:
a. Only a commercially available pump gasoline that complies with these rules is allowed. (The term “pump gasoline” includes fuels dispensed
from service station pumps and racing fuels that are commercially available in fuel cans and drums.) The gasoline may be mixed with
petroleum, vegetable, or synthetic based lubricants. The use of oils, fuels (including gasohol), and additives that provide power-boosting
characteristics are forbidden.
b. Only motor fuel compounded of standard pump gasoline and an acceptable lubricant are allowed. Additives that produce power more than
that produced by standard pump gasoline and petroleum base oil shall not be permitted. The list of unacceptable additives includes, but is
not limited to, alcohol, nitrates, and other oxygen bearing compounds.
c. No competitor or driver’s pit personnel shall possess power boosting additives or agents upon the race premises of the sanctioned event.
Violations of this rule shall subject the violator to severe disciplinary procedure.
d. Aerosol cans of ether are allowed at sanctioned races for starting purposes. No driver will be allowed to carry such cans on their person or
their snowmobiles during the race.
e. Driver statements as to their fuel components will be binding and may be verified by various fuel tests. Drivers must allow officials to test
their fuel at any time.
f. Youth Oval Racing classes, commercially available gasoline that is reformulated with up to 10% ethanol is allowed, the exception being “Big
Track” competition for 120, 206 and 200 base class sleds. 120/206/200 and all oval junior classes must use legal fuels containing no ethanol.
FUEL TESTS
WARNING: Gasoline, lubricants, additives, and fuel test reagents are all potentially hazardous materials. Anyone handling them should be aware of
the hazards and act accordingly. Race Rules Committees and ISR establish these guidelines and recommended test procedures, but do not assume
liability for injury or death caused by the handling of these materials.

[F5 Dave]

Sounds like a good case for an intelejet and plug egt back in. Twist more fuel in.

[Viking]

What Wob said, but Does your rules allow for e10 or suchlike?
Alcohol buys you leeway both in tuning latitude as it tolerates mixtures being ballpark as long as its over-rich, its also very forgiving into adding lipstick to a thermal pig that a AC2T engine is.

If it this class they are a bit more open than you may think

E10 gasoline did not exist in year 1995 in Sweden,
and as I mentioned there was no cooling problem in normal winter weather during the whole racing season.
The engine had good power, so I put my effort in suspension work and focused to be a better rider...

[Viking]

Sounds like a good case for an intelejet and plug egt back in. Twist more fuel in.

Case closed in 1995.
Engine retired.
My future was to go liquid cooled.

[Wos]

Case closed in 1995.
Engine retired.
My future was to go liquid cooled.

Viking!

May i ask which compression ratio and exhaust timing your engine has?

And your ignition/ timing is from interest too.
Fix ignition? Timing Curve? Values of timing?

Ignition without failures and constant when pickup, coil, cdi hot in race?

Grüße Wolfgang