34 replies to this topic

[Johnny D]

I'd like an arrive and drive back east. Bucket list track preferred.

I'm willing to put my money where my mouth is.

Whatever he charges for the weekend I'll wager.

I'll pay it if I lose, double it if I come out

Will cost me more than him.

He's been in the Auto biz for 40 years.

Should be a no brainer to take me up on this.

J~

[Steve Scheifler]

Funny how he forgets that unlike old carburetors and chokes (worse yet manual chokes) modern injection systems also do a pretty good job of maintaining an appropriate mixture so there isn't a lot raw fuel making its way into the pan during warmup. Meanwhile, there's a difference in expansion rates between forged and cast aluminum pistions. Our pretend race engines are cast, and possibly hypereutectic, which means among other things that they will expand LESS than most forged pistons found in real race engines (and diesels, which is one reason the rattle/slap more when cold). So in fact street cars generally run tighter clearances than real race cars, not the other way around. Even with our wannabe engines many people loosen up the bores a bit as a trade off between friction, leakdown,etc. Bearings are also often looser in race engines than modern street versions, again with trade offs but done in concert with the choice of oil viscosity.

[Steve Scheifler]

Oh, and before someone quotes something talking about how later F1 engines are warmed up before they are started due to very tight tolerances, those are as different from what we have as most things they do.

[Bench Racer]

I'm willing to beat you a free arrive and drive weekend in one of your cars. At a min. it stands for winter grade.
 
Any other taker ??
J~

Beat, we all understand the Johnny code.

 

Were in agreement, WINTER.

[Johnny D]

Beat, .

 

 

         

 

J~

[luvin_the_rings]

So which one of us is racing in 20 below? Because he's the only person who will benefit from a standing warm up at idol. 

[Steve Scheifler]

In my 40 years in the auto industry, w has always stood for weight. If it stood for winter, why would 120w-150 drag racing gear oil have a W in it....

Another internet waste of time

W is clearly a reference cold temp viscosity measurement regardless of how they originally chose the letter. (I'll go with winter) Oddly enough, it seems that gear oils follow different naming rules than do engine oils, so the weights aren't even comparable.

[Johnny D]

the American Petroleum Institute use a GL rating.

API viscosity ratings for gear oils are not directly comparable with those for motor oil, and they are thinner than the figures suggest. For example, many modern gearboxes use a 75W90 gear oil, which is actually of equivalent viscosity to a 10W40 motor oil. Multigrade gear oils are becoming more common; while gear oil does not reach the temperatures of motor oil, it does warm up appreciably as the car is driven, due mostly to shear friction (with a small amount of heat conduction through the bellhousing from the engine block).

 

https://en.wikipedia.org/wiki/Gear_oil

 

J~

[CruzanTom]

I warm up my race car in cold temperature races to get my heater working. Once the heater is going strong, my car is ready to race!

 

Thankfully, I don't do many cold weather races. I don't think I will have to worry at Sebring next week.

[LarryKing]

Also, never lug your motor.

 

You could throw your back out and you get all greasy.

[SaulSpeedwell]

"Ten foot pole"

 

% fuel dilution is "supposedly" a bigger problem with direct injection, and every DI engine I've owned has essentially confirmed that. 

 

In any case, you can help separate Internet opinion/fiction from news you can use by doing Blackstone reports on your own car, for your own usage, to establish proper maintenance protocols.  Somewhere on Bobistheoilguy (and here?) I posted a '99 SM oil analysis taken after 2 hours of time (one "National" weekend) and 4 hours of time (two weekends).  For my car, with my engine, with my oil, and my usage, and my "idling" protocol .... what it told me was there was no reason I needed change oil "every weekend".  In other words, the PPM of contaminants for 4 hours of track time were exactly twice that for 2 hours of track time. 

 

$30 and a half hour to change oil every race weekend is probably feelgood insurance for most, but I also want to make sure Sager's grandkids have as few environmental problems as possible while they are dodging bullets in Chicago.

[Steve Scheifler]

Interesting about DI, that requires a little thought. Perhaps with port injection atomization is significantly improved as the high velocity charge rushes thought the port, past stem and valve, then warms and expands rapidly into the large cylinder/chamber even as the piston comes up to squeeze it. Yea, I could see that.

Have I mentioned my favorite oil study lately? No? Then it's time. One that Ford did showed that engine wear rates were highest in the first few hundred miles after each oil change, then stabilized until the oil became contaminated or broke down significantly. Not exactly an endorsement for the "insurance" excuse.

[Argus48]

I remember my dad telling me to always warm up my car.

[Johnny D]

Here a little more to the story...

Here's Exactly How Long Your Engine Takes to Warm Up When It's Below Freezing

http://www.roadandtr...below-freezing/

 

[luvin_the_rings]

that was great, always wanted to do that.