OVERKILL
$100 Site Donor 2021
Yeah, that's not a real grade. Specs are:
So if we look at J300:
It's a 0W-8.
Yeah, that's not a real grade. Specs are:
That's a qualifying oil. They run that oil in racecars for qualifying laps only, to eek out every fraction of a horsepower, and then they drain and refill the dry sump with a heavier oil for the race when they require sustained protection.
The 0W-5 Redline that was posted.Who is 'they' and what oil are you talking about?
Interesting build and why they use a 50 weight oil. Good explanation.
I doubt the owner's would wait for the engine to preheat too. Crazy the increase in bearing clearances at these lower temperatures!
You're smarter than the average bear.Here’s a bit of rough math. Steel expands by 0.07% for every 100F.
So, in his test, he heats the block by roughly 100F, from shop at 65 to 150, and the bearing internal size grows by about 2.5 thousandths. Then he claims that the bearing clearance grew by that much “because steel doesn’t expand”.
But steel does expand, it just does so at a different rate.
So, call the crank journal 2.0 inches. With 100F increase, same as the block was heated in the video, the crank will expand by 1.4 thousandths.
So, no, the bearing clearance didn’t increase by 2.5 thousands at 150F - the actual clearance grew by 2.5 - 1.4 or about ONE thousandth.
Because he failed to measure the crank expansion, overestimates the clearance expansion by a factor of three.
That is a huge fail.
Ain't nothing "chevy" about a Donovan block or any parts installed into one. Please stop it.Dealing with expansion in aluminum blocks at sustained high HP has always been a challenge that the chevy form factor has down.
You could get Donovan aluminum small block that put out frightening amounts of power for extended intervals with zero problem (until a rod leaves the block) - and even then they can be repaired.
The chevy formula cannot be beat here.
He said Chevy form factor, not literal OEM Chevy blocks.Ain't nothing "chevy" about a Donovan block or any parts installed into one. Please stop it.
Ain't nothing "chevy" about a Donovan block or any parts installed into one. Please stop it.
How much stress are you putting on your 600plus BHP motors you run the 20 grade oil in driving around town?Tens of millions of cars with billions of miles over the last 30 years running 20 grade oils goes against his conclusions. Also, Lamborghini has not had any engine issues running 40 grade oils on the track. And it seems that many 40 grade oils thin to a 30 grade oil with hard use. I have not had issues running 20 grade oils in all sorts of 600plus BHP engines. I believe this is a poor experiment giving these conclusions.
Ali
PS
I am currently running 0W-5 in my Lincoln Navigator.
I think nearly everyone here knows you are a doctor, and a very successful one. Congratulations. Seriously.Tens of millions of cars with billions of miles over the last 30 years running 20 grade oils goes against his conclusions. Also, Lamborghini has not had any engine issues running 40 grade oils on the track. And it seems that many 40 grade oils thin to a 30 grade oil with hard use. I have not had issues running 20 grade oils in all sorts of 600plus BHP engines. I believe this is a poor experiment giving these conclusions.
Ali
PS
I am currently running 0W-5 in my Lincoln Navigator.
If I remember your previous post about running 20 grade oils in "600" plus bhp engines, you were just using the car to putt around town....correct me if I'm wrong.I have not had issues running 20 grade oils in all sorts of 600plus BHP engines. I believe this is a poor experiment giving these conclusions.
Ali
PS
I am currently running 0W-5 in my Lincoln Navigator.
Doesn't sound better at all. Just because you can bolt the heads on it, it means nothing. Donovans have a raised cam location, you can get them with different bore spacing, etc etc etc. Nothing Chevy about it at all.Since gm/chevy heads bolt right on Im going to disagree - thats the form factor thing I mentioned.
Call it "GM small block form factor" if that sounds better to you.
Man, just because he's a doctor does not mean he's an expert in every other field. It means he's an expert in his. He can afford to try things and pawn his opinion on internet message boards about his "experiments ", however skewed they may be to reflect and validate his opinion.I think nearly everyone here knows you are a doctor, and a very successful one. Congratulations. Seriously.
I think your spending power is overlooked in these low viscosity discussions. If your Navigator blows its motor I suspect you have the financial power to simply go out and buy a new one that same day, and write a check for it.
This is unlike most of us and as a consequence most of us would not consider running a super low viscosity oil in a vehicle we cannot afford to repair or replace without putting a noticeable dent in our financial resources.
Respectfully,
Scott
Doesn't sound better at all. Just because you can bolt the heads on it, it means nothing. Donovans have a raised cam location, you can get them with different bore spacing, etc etc etc. Nothing Chevy about it at all.
I can bolt LS heads on a SBF, does that make a sbf a LS block form factor???
I can bolt Poncho heads to a BBC. What form factor does that fall under???
Once you hot the aftermarket block option, "form factor" goes out the window as well as Ford, Chevy, etc.
There is no "Chevy" formula, no Ford formula, etc, once you hit the aftermarket for blocks.
One "formula" that seems to stay constant is the FANBOI formula.