[jthblues]

I hope an easy one...does anyone know of how hot the typical exhaust pipe gets? A Range is fine...I'm thinking about buying a Temp Guage from a friend and want to know how hot Harley Pipes typically run...I guess a rich set-up would be less hot vs. a lean set-up...

Thanks for the answers...any idea on the temps the pipes get?

[CD]

Are you referring to an EGT guage? The EGT range is pretty wide depending on idle to high RPM and is flow sensitive. In other words, for tuning purposes an EGT guage is commonly used to lean out engines such as air cooled aircraft engines thar run at a constant RPM to just below peak EGT. This gets the engine close to a 13:1 air to fuel ratio. Most times this is used on air cooled aircraft. By properly setting the mixture you get a cooler running engine, less wear, lower temps and extends your range. Bear in mind that with any RPM change you then have to re-adjust the mixture.

In a fixed metered sytem like a carbureted or EFI bike where changes are not readily made on the fly, the guage is less usefull but, can provide information during tuning.

An AFR guage like Dyno Jets or similar will give you real time air fuel ratio readings via a multi wire oxygen sensor. This is far more usefull for tuning over an EGt guage IMHO.

[hotroadking]

Have to agree, Daytona Twin Tech makes a system with a o2 sensor that reads the information from the sensor and adjusts the fuel curve. Pretty sweet stuff amazing how you can take a part designed to reduce emissions and improve performance huh.

Otherwise a dyno with the afr reading is the best bet.

[CD]

Originally Posted by jthblues

Thanks for the answers...any idea on the temps the pipes get?

That depends on the RPM and the mixture at that RPM. Any other RPM will be a different temp. As far as the actual temp, we used to trim at 350-450º EGT on air cooled aircraft engines.

If you are wanting to use this guage for reference at a given RPM, remember, the reading of the mixture is valid at that RPM point and that throttle setting. Otherwise, it is strictly a novelty guage.