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That’s usually been my thought process as well.
Surprising result from HPL use
- Thread starter loneryder
- Start date
Placebo Effect....
Triple_Se7en
$50 Site Donor 2024
I've spent years brisk walking in both the high temp heat and low temp cold. My oxygen fight not only occurs in very warm weather, but also very cold weather.
But then you get less power. So in response you put your right foot down harder, so as to burn the same amount of gas (so as to get the same amount of power).
What you say would be correct for WOT. If the engine lived at WOT, then power output drops as temperature goes up, and less fuel would be consumed (but in turn accomplishing less work).
It's not about oxygen, at least not in that context. Maintaining a set speed requires a given amount of power to overcome vehicle weight, wind resistance, rolling resistance, etc... This requires slightly higher throttle opening to ensure enough oxygen to burn enough fuel to make said power. Therefore, fuel delivery does not change. What does change is pumping loss. Since the throttle is slightly more open, there's slightly less intake vacuum and thus less power lost when the pistons have to draw against that vacuum on the intake stroke. Aside from that, warmer air is less dense which means there's less wind resistance against the vehicle. It's the same reason a car gets better fuel economy at higher altitude than at sea level.
I think you guys are correct regarding WOT.
I was thinking about "back in the day" (30-35 years ago) racing snowmobiles in northern WI and MN. If it got really cold out (-20 / -30 F) we would have to step up to the next size of main jet, or the engine would run so lean it would burn a hole in the top of the piston. Saw it several times. In that case, was certainly always running at WOT for extended periods of time.
So, how does that actually work? Let's say we are at sea level. If the temperature changes from +90 F to -30 F, isn't there still 20.9% oxygen content in the air?
Another question I am pondering in my mind. My cousin has a '95 F-250, 7.3L PS. Turbo, but no intercooler. When he is in NC or WI and the temperature is, say 35 F, he says when he pushes in the clutch to shift, the boost gauge will stay up a bit, then he shifts and accelerates, it builds much faster. In south FL during the summer, 95 F and humid, he says when he pushes in the clutch, the boost gauge instantaneously drops to zero. Then he shifts and accelerates, it takes longer to build boost back up. Is that somehow related to all this as well?
I was thinking about "back in the day" (30-35 years ago) racing snowmobiles in northern WI and MN. If it got really cold out (-20 / -30 F) we would have to step up to the next size of main jet, or the engine would run so lean it would burn a hole in the top of the piston. Saw it several times. In that case, was certainly always running at WOT for extended periods of time.
So, how does that actually work? Let's say we are at sea level. If the temperature changes from +90 F to -30 F, isn't there still 20.9% oxygen content in the air?
Another question I am pondering in my mind. My cousin has a '95 F-250, 7.3L PS. Turbo, but no intercooler. When he is in NC or WI and the temperature is, say 35 F, he says when he pushes in the clutch to shift, the boost gauge will stay up a bit, then he shifts and accelerates, it builds much faster. In south FL during the summer, 95 F and humid, he says when he pushes in the clutch, the boost gauge instantaneously drops to zero. Then he shifts and accelerates, it takes longer to build boost back up. Is that somehow related to all this as well?
SammyChevelleTypeS3
$50 site donor 2023
Well, our experience with HPL motor oil is not a surprise , but still a pleasant outcome. I am on about the 3rd or 4th oci with HPL products and have to say I am very pleased. No shocking miracles or anything but happy to say the least with the HPL product line I am using so far. Started out on the 2018 Honda Accord 1.5 GDI-T engine with HPL 0w20 SCEO. Then moved to 0w20 PPPC and now using 0w30 PPPC.
Since using the HPL oils, the engine seems to be getting cleaner each oci. It was looking very dark quickly with every other oil used on the dip stick shortly after each change. Once moved to HPL the oil seemed to take longer to get dark after the first 1 - 2 oci. Now it takes at least 2000mi to 2500mi to even start to get darker using the HPL. I am running the HPL PPPC 0w30 now for the first time. Planning a 4000mi to 4500mi oci with it. Just took a nice 300mi round trip in the car and it ran smooth and got 43mpg on interstate in cruise doing between 75mph to 80mph. We have seen as much as 45mpg to 49mpg before with 0w20 but so what... The car warms up much faster and so far the fuel dilution has slowed it seems. Plan to check/verify the fuel in oil % this oci with a sample going off to OA labs.
Since using the HPL oils, the engine seems to be getting cleaner each oci. It was looking very dark quickly with every other oil used on the dip stick shortly after each change. Once moved to HPL the oil seemed to take longer to get dark after the first 1 - 2 oci. Now it takes at least 2000mi to 2500mi to even start to get darker using the HPL. I am running the HPL PPPC 0w30 now for the first time. Planning a 4000mi to 4500mi oci with it. Just took a nice 300mi round trip in the car and it ran smooth and got 43mpg on interstate in cruise doing between 75mph to 80mph. We have seen as much as 45mpg to 49mpg before with 0w20 but so what... The car warms up much faster and so far the fuel dilution has slowed it seems. Plan to check/verify the fuel in oil % this oci with a sample going off to OA labs.
