Author Topic: Where to put pyrometer (Read 2878 times)

dieseldunebuggy · « **on:** January 17, 2008, 10:54:05 am »

I'm making a exhaust header for my 1981 vw rabbit with dual outlets for dual exhaust. Where should I put the pyrometer in the header for a good reading?

jimfoo · « **Reply #1 on:** January 17, 2008, 11:54:47 am »

Close to the head. You will loose heat dramatically the further away you are.

dieseldunebuggy · « **Reply #2 on:** January 17, 2008, 01:49:34 pm »

Which cylinder would be the best one to put the sending unit.

jimfoo · « **Reply #3 on:** January 17, 2008, 02:32:08 pm »

I'd think #2

DonGTI · « **Reply #4 on:** January 17, 2008, 09:21:00 pm »

curious... any reason why No2?

vanagonturbo · « **Reply #5 on:** January 17, 2008, 09:25:41 pm »

Well cause Nitrogendioxide would be a really hard place to mount something solid

Oh, sorry. I would say 1 or 2 because they get the hottest. Farthest away from the oil pump and such.

burn_your_money · « **Reply #6 on:** January 17, 2008, 10:27:44 pm »

I would think #2 or #3. They always seem to crap out first in my experience. Install 4 pyros

jimfoo · « **Reply #7 on:** January 18, 2008, 06:46:04 am »

After my sand experiment, I'd say #3 gets the most air, so might run slightly cooler than #2, which is my basis for #2 over #3. Of course air doesn't have the mass of sand so it may be more equal than I give it credit for.

dieseldunebuggy · « **Reply #8 on:** January 18, 2008, 08:52:45 am »

I have ported and polished the head. Knowing that would you still say #2 cylinder over #3 cylinder.