IDoSeaDoo
Well-Known Member
Hey guys, I recently bought a set of Koso EGT gauges for my 787 Challenger. I plan on tuning all my skies with this gauge, but currently am starting with my boat. I have a fresh rebuild on this motor, pressure tested to hold 10psi. Standard bore, with some chamfering of the case and cylinders. I just basically cleaned up the casting marks and smoothed some edges. The probes sit about an inch away from the Y-pipe gasket and are right in the center of the port. When I fired the engine up, I get a reading that my Mag cylinder runs quite a bit hotter than my PTO. Like 100degF hotter. I feel that this is worthy of action. This persists through all bands of RPM and I was not able to tune it out with needles. I haven't taken carbs apart yet, but did look and see that the linkage was adjusted. Judging with the eye up close to the carb, they seem identical, but is there a better method of verifying? Is it common to have one cylinder run this much hotter? What's an acceptable differential gradient? Would pop-off pressure affect the fuel delivery at all RPMs?
Thanks!
Thanks!