Hi Brian, I have never seen a Chris Craft 45 with the 8v71t engine. They all either have 8v71n's (motor yacht) or 8v71ti's (Most all Sportfishers.) I installed Hewitt Pyrometers on my 8v71ti's. They are useful in the sense that they tell you if you are overloading your engines and give you information about the temps of each cylinder bank which can reveal over or under fueling of that bank. If you decide to install them, don't stress about mounting them before the turbos in the cast iron riser, unless its easier. I wouldn't though, because I'd always fear of a probe breaking off and going into the turbo. In marine applications, after the turbos is fine. The pyros just take longer to record the temp, but they will catch up and give the same reading. I got that from the owner of Hewitt a few years back, who also pointed out that many marine diesels manufactures locate them after the turbos. Mine run at about 690 Fahrenheit at 1900 RPM.
Do you need them? Well if your engine is turning 2300 RPM wide open throttle under full load, and you have the correct injectors, it's unlikely you are overloading your engines.
Hi Brian, I have never seen a Chris Craft 45 with the 8v71t engine. They all either have 8v71n's (motor yacht) or 8v71ti's (Most all Sportfishers.) I installed Hewitt Pyrometers on my 8v71ti's. They are useful in the sense that they tell you if you are overloading your engines and give you information about the temps of each cylinder bank which can reveal over or under fueling of that bank. If you decide to install them, don't stress about mounting them before the turbos in the cast iron riser, unless its easier. I wouldn't though, because I'd always fear of a probe breaking off and going into the turbo. In marine applications, after the turbos is fine. The pyros just take longer to record the temp, but they will catch up and give the same reading. I got that from the owner of Hewitt a few years back, who also pointed out that many marine diesels manufactures locate them after the turbos. Mine run at about 690 Fahrenheit at 1900 RPM.
Do you need them? Well if your engine is turning 2300 RPM wide open throttle under full load, and you have the correct injectors, it's unlikely you are overloading your engines.
John, thank you I am redoing all the gauges on my 45' and that one was suggested as a possible need