1996 Silverado K1500 Fresh Meat

[Gasoline Fumes]

Can you plug in a block heater? Preheating as many fluids as possible would help. Block/coolant heater, oil pan heater, trans pan heater, etc.

[aerohead]

TESLA is using PENTOSIN ATF-9 for 20,000-rpm motors, which actually has a higher viscosity than the DEXRON-III ( 7.5 cSt, to as low as 5.5 cSt, vs 7.0 cSt )
----------------------------------------------------------------------------------------
The upcoming PORSCHE/RIMAC Bugatti Tourbillon electric motors operate at up to 24,000-rpm.
SAE testing of automatic transmissions found that they can survive on as little 4.0 cSt kinematic viscosity, which would qualify as 'unobtainium'.
We ought to keep are ears to the rails, and look for technical bulletins regarding Bugatti's 'engineered from the ground up' ATF specifications, and any 'caveats' that would limit its use in earlier hypoid gear applications.

[aerohead]

Next time you're near a late model pickup, take a peek inside its wheel wells. And compare that to late model passenger cars.
This wheel-house 'volume' reduction vs Cd, is something shown to reduce drag, in both wind tunnel and CFD investigations.
Since, like a belly pan, they don't 'show', designers have embraced them to gain efficiency, without risk to sales, and aerodynamic engineers have license to dial in 'optimums', allowing just enough for 'wheel flop' and snow chain install / removal clearance.

[vteco]

Originally Posted by aerohead

TESLA is using PENTOSIN ATF-9 for 20,000-rpm motors, which actually has a higher viscosity than the DEXRON-III ( 7.5 cSt, to as low as 5.5 cSt, vs 7.0 cSt )
----------------------------------------------------------------------------------------
The upcoming PORSCHE/RIMAC Bugatti Tourbillon electric motors operate at up to 24,000-rpm.
SAE testing of automatic transmissions found that they can survive on as little 4.0 cSt kinematic viscosity, which would qualify as 'unobtainium'.
We ought to keep are ears to the rails, and look for technical bulletins regarding Bugatti's 'engineered from the ground up' ATF specifications, and any 'caveats' that would limit its use in earlier hypoid gear applications.

Wow, esoteric stuff aerohead. Re ATF.. I like seeing practical testing, like I mentioned elsewhere (trying to reduce my non-aero posting in this thread):
https://ecomodder.com/forum/showthre...tml#post697244

[vteco]

Originally Posted by aerohead

Next time you're near a late model pickup, take a peek inside its wheel wells. And compare that to late model passenger cars.
This wheel-house 'volume' reduction vs Cd, is something shown to reduce drag, in both wind tunnel and CFD investigations.

Will definitely be thinking about this when I get the truck back from repairs. Also spats, and wheel covers.

[Logic]

Originally Posted by Piotrsko

Not to be distracting: I am under the inpression that the larger lift was to open the valves sooner with a longer chance to blow the mixture straight out the exhaust during the increased overlap. On a huffed engine, you run smaller lobed cams

Don't you mean smaller DURATION cams, so that there is less valve overlap between the exhaust and intake stroke?

[vteco]

Either way, I won't be changing cams....

[Piotrsko]

Originally Posted by Logic

Don't you mean smaller DURATION cams, so that there is less valve overlap between the exhaust and intake stroke?

If you read the specs published with the cam, the duration automatically changes with the lift, kind of the point. Overlap can sometimes remain the same based on the start point of the opening when you grind the blank. Overlap calculations are above my paygrade. The top fuel people have massive cams, but they do not idle at 800 rpm because the flows, having mass, interfere with each other at low speed and you huff raw mixture sometimes burning, out the exhaust, which is rather exciting. See "zoomies" at night drags. More exciting is huffing hot exhaust out the intake which is why the roots blower is chained to the vehicle. Turbos just generally grenade the engine compartment. Prolly wouldn't notice that in an econo box.

The real trick with cams is calculating the effects of the changes and whether or not they improve your situation. Everyone I knew guessed and hoped. Luckily you can swap a cam between races if you can tolerate leaks & a wee loss in efficiency

[vteco]

I drove the Silverado for twenty minutes today to the mechanic who will repair the fuel leak. On the way I was able to try out the Torque app on my cellphone with the new bluetooth adapter in the truck.

The drive was mixed hills with curves at 35-40, and one couple mile long level and straight stretch at 50 mph.

Overall trip mpg was ~17. Realtime mpg was quite interesting.

The trip mpg started dropping below 17 on the 50 mph straightaway, and this was strongly reflected in the real-time reading.

Trip mpg actually then recovered and increased to 17.6 by the time I got to the driveway -- this on the 5 mile up-mountain section!

Pretty obvious then that aerodynamics are holding mpg back even at relatively low speed of 50 mph.

Really looking forward to deleting that outside sun shade at the front of the cabin to see what that does, as a first step.

Also looking forward to getting the truck back for lots of planned changes.

[freebeard]

Pretty obvious then that aerodynamics are holding mpg back even at relatively low speed of 50 mph.

Have you seen this?