[Diy_efi] Combustion temperature for max power

[A6intruder]

Hugh,

In theory you are right, you want the highest combustion temps possible for
best power & efficiency.  In reality, the other factors that weigh in are
pre-ignition and detonation, temperature limits of your engine parts (piston
domes, valves and exhaust turbines(turbo).  I assume since EGT became a
factor you are running a turbo.

Short answer, I would just run enough water/methanol to achieve the affects
you desire.

The water/methanol injection should/could allow you to run a little more
boost and possibly some more spark further increasing your power.

Have fun.

Daniel R. Nicoson
Equipment Exchange Company
Phone:  (814) 774-0888
Fax:      (814) 774-0880

-----Original Message-----
From: diy_efi-admin at diy-efi.org [mailto:diy_efi-admin at diy-efi.org]On Behalf
Of Hugh Keir
Sent: Thursday, December 12, 2002 12:59 PM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] Combustion temperature for max power

I have been playing around with the results from my DIY wideband for some
months now while tuning my ECU and am delighted with the information it
provides. Thank you Thank you Thank you to all involved.

I have an exhaust gas temperature sensor fitted and found that things were
getting a little hot on high boost.

I have now fitted a 50% water 50% methanol injection system and find that
the exhaust gas temperature on boost can be brought way down.

The Ideal Gas Law tells us that pressure = gas temperature * volume.

Question is:

If burning fuel + oxygen turns into heat and the heat gives pressure in the
chamber to move the piston down, does it then follow that you want the
maximum in cylinder temperature before melting things to get maximum
horsepower from your engine?

If this is true, the water methanol injection needs to be used to put a cap
on exhaust gas temperatures rather than hosing the mixture in to the
cylinders.

This may then raise the question of is it best to reduce the injection jet
size or reduce the % of methanol injected to bring the temperature back up.

Thanks

Hugh


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