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Herman, good luck on your home made exhaust system. You want the temps I am experincing from my readings. These temps only reflect the hottest head bolt (degrees f) and not the actual exhaust temps so your readings may vary when you design your exhaust system. If you need to check higher temps you can buy a pyrometer. this can check temps to 2000 degrees. Found it on the internet, I think also VDO. I gave all my head temps in details in message thread "CAR FIXED and BIG QUESTION" MSG# 26879 DEC 27 2000 but I can give you these again, (MODIFIED CUT AND PASTE): I have dirven this car a total of one week at temps around 70 to 75 degrees outside temps (nice weather here). My head temp gage sensor is made of bimetal which has a thermal-electric characteristic (current flow caused by heat to move the meter movement). My sensor is installed on front top bolt nearest exhaust outlet on the number three cylinder . Generator or battery voltage has no effect on this meter. Using my temperature meter I was enlightened of our engine's heat dissipating character. I found that the amount of temperature is proportional to the position of the gas pedal. The head temperature changes drastically in tens of seconds rather than minutes; expansion changes are continueous. Temperature findings : - Idle , cold weather (55 degrees f) temp gage read steady after 3 minutes at 325 degees. - Idle , moderate weather (75 degrees f) temp gage read steady after 2 minutes at 325 degree. - With engine thermostat, engine warms to 325 in 3 minutes and stays there. Outside temp 50 degrees. Very quick warmup! At 75 degress outside temp minimum two minutes readings taken from drive from Tijuana to city of El Cajon: - Flat road, 50 mi/hr 350 degrees - Flat road, 65 mi/hr 360 degrees - Flat road, 75 mi/hr 370 degrees - Flat road, 85 mi/hr 390 degrees - Moderate Hilly road, 50 mi/hr 350 degrees - Moderate hilly road, 65 mi/hr 375 degrees - Moderatehilly road, 75 mi/hr 410 degrees - Continuous climb, moderate grade 55 mi/hr 370 degrees - Continuous climb, moderate grade 65 mi/hr 410 degrees - Continuous climb, moderate grade 70-75 mi/hr 450 degrees - Continuous climb, moderate grade 80 mi/hr 475 degrees. Found that heavy stop and go traffic, temps stays between 325 and 350 degrees. Downhill is 325 degrees. Continuous heavy city driving, take offs, passing, blowing doors the temp stays around 325 and 360. To summarize: The faster I go the hotter it gets, the steeper the hill also the hotter it gets. I guess the term "slow down" also applies to us and not only to upright engines. Also found, that leaving the heater on in moderate to warm weather, increases engine head temperature, ( I am guilty of prefering sauna temperatures inside car) because air leaks into car cabin. >-----Original Message----- >From: Herman Haustein [mailto:haustein@netvision.net.il] >Sent: Monday, January 01, 2001 11:09 AM >To: Martinez, Leon; type3@vwtype3.org >Subject: Re: [T3] re head temp >Leon , >With all this talk about head temps, you never mentioned how much do you see >(degrees F) ? >The reason I ask is I'm on the verge of a "do it myself" exhaust manifold >job. And temp's are important. >Let us know how high you go. >Herman LEON MARTINEZ martinezl@ftscpac.navy.mil 1969 SQUAREBACK EFI/AUTO SAN DIEGO AND TIJUANA ------------------------------------------------------------------- List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org