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Originally Posted by ntsqd  Sort of off topic, but why are you getting vapor lock with EFI?
This should not be happening. Just like coolant, fuel's boiling point also goes up with pressure. That combined with the constant cycling of fuel through the system should eliminate any possibility of vapor lock.
If you are getting vapor lock with EFI then I would say that you are leaning out in those conditions, which would drive the engine's temperature up considerably.
Is the FPR on the opposite end of the 62's fuel rail from the supply end?
If you can operate consistently and reliably at 200 I'd say that's a good thing. The OE's didn't increase the operating temps of late models because they couldn't cool them lower, they increased to operating temps because there is more efficiency to be found there. So long as things like ring gaps don't close off and stuff doesn't melt, a higher operating temp isn't a bad thing. |
Interesting. I'm not having any problems, I was just saying that vapor lock is why that fan is there. My understanding was that underhood temp increases after shutdown and heat soaks the fuel rail. I could be wrong about the reasons but my understanding is that the fan is for vapor lock.
You're right, OE's raised the operating temp. Not sure about efficiency but emissions are better at higher operating temps. In most cases OEMs did this on engines with aluminum heads, which reject heat a lot better than iron heads. That isn't ideal for best power and it is common to swap 180 degree t-stats and lower the operating temperature for cooling fans on late model performance engines (very common on the LT/LS series of engines). However my goal was to reduce my pre-rebuilt engine's mild detonation tendency by attempting to keep the head/combustion chamber somewhat cooler (fortunately I don't have any detonation post rebuild, and I run a J&S Safeguard knocksensor to make sure it stays that way).
As a side note I know that I'm not running lean, I have an Innovate LM-1 wideband O2 in the front of my dual entry/dual exit cat (so it's like putting it in an x-pipe to see exhaust from both banks of cylinders)
