EGT location question, Jake? Options

[SpecialK]

My '73 (carbed/Web 86 cammed 2.0L) will be sporting 4 EGT probes and 4 CHTs (one for each cyl., got one hell of a deal on them plus I read the "dropped valve seat" post (IMG:style_emoticons/default/icon8.gif) ). I've got one Westberg combo EGT/CHT gauge and a 4-way switch. The mfg. says to mount the EGT probes 6" from the exhaust port, but I'm running heat exchangers. If I mount them at the end of the heat exchangers just before the muffler flanges will I render them pretty much useless for tuning purposes, or is the temp drop at that end of the exchangers insignificant (again, for tuning/monitoring purposes). I'm afraid if I install them up by the heads, they'll be vulnerable to road debris, i.e. - semi retread rubber (A.K.A - road gators), critter's, assorted crap that flies out of Redneck's trucks w/o tailgates, etc...

Also have an A/F gauge I was going to install, but that would probably just be overkill (IMG:style_emoticons/default/rolleyes.gif)


As always, any input is greatly appreciated (IMG:style_emoticons/default/beer.gif)

Kevin

[Slowpoke]

What's important with EGT probes placement, is their location. If it's too close the the exhaust valve, you get good measurements but short probe life. Too far from the exhaust valve you get good probe life and low readings. I've never heard of probe placement closer than 2-4 inches. If the instructions say to place them 6 inches away, I think that is kind of far away, so, either they are lower quailty probes, or/and, the gauge is calibrated for their placement that far away. Do you have fast acting probes? Can you use a better quaility probe closer to the exhaust valve? All good questions to ask the company that made it. ALso, check with them to see if you can cut the wires going to the probes. Lower quaility instruments don't allow you to JUST SHORTEN any leads to the probes. This makes for a sloppier appearing installation. (IMG:style_emoticons/default/smile.gif)