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Search found 236 matches

by BobbyB
Wed Feb 19, 2020 4:14 pm
Forum: Engine Tech
Topic: Advantages of electric cooling fans vs mechanical
Replies: 26
Views: 901

Re: Advantages of electric cooling fans vs mechanical

A Derale 16926 fits a 1966 mustang like it was made for it. It's a fan/shroud combo. The sucker draws 20+ continuous amps, and blows like a hurricane. Zero problems with cooling on the street, and I'm even using an old Moroso electric water pump drive that spins the stock water pump! I did use the '...
by BobbyB
Wed Feb 19, 2020 2:39 pm
Forum: Engine Tech
Topic: Advantages of electric cooling fans vs mechanical
Replies: 26
Views: 901

Re: Advantages of electric cooling fans vs mechanical

Can anyone share some real world drag strip numbers from mechanical to electric fan?
by BobbyB
Tue Feb 04, 2020 3:29 pm
Forum: Engine Tech
Topic: Metering block , Missing restrictors
Replies: 34
Views: 6635

Re: Metering block , Missing restrictors

Brining back an old thread from the dead. My question is this: is there ever a time to use T slot restictors in a 4150 carb application?? I have a 830annular, 950 hp,850 demon that I modified for transfer slot restrictiors, I found you get more stable afr at low speed driving and smoother accelerat...
by BobbyB
Mon Jan 20, 2020 11:30 am
Forum: Engine Tech
Topic: run-in AFR
Replies: 10
Views: 742

Re: run-in AFR

to those who frequently run engines in on the dyno with a wideband o2 sensor in the exhaust, how rich would you say is bore wash territory? I have a number in mind, but i'm not sure If i'm being overly cautious (anything richer than low 13's with no load on the engine should be shut down) am I far ...
by BobbyB
Sun Dec 08, 2019 3:40 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 275
Views: 9295

Re: when are 3/4 grooved main bearings needed for bbc ?

CJ, Thanks so much for your sensible post on a fantastic topic. You made some points much better than I have been able to. I am super interested in what you have experienced with Clevelands using aftermarket cranks working well. What is your recommendation for oiling mods and crankshaft for a Cleve...
by BobbyB
Sat Dec 07, 2019 6:29 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 275
Views: 9295

Re: when are 3/4 grooved main bearings needed for bbc ?

I see...you don't agree so you call me names. That makes you a pussy because you wouldn't say that to my face. I understand that you don't know this so I must be wrong, and this is your way to get Mike to lock a thread which you can't dominate. You are classLESS. Hahaha, your to much! You can dish ...
by BobbyB
Fri Dec 06, 2019 2:29 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 275
Views: 9295

Re: when are 3/4 grooved main bearings needed for bbc ?

Well, did a 340 sbm with a buddy in 98. Makes about 600hp, and still turns 8k+ everytime he drives it (70 Dart Swinger street car). Just did a a pretty good twin turbo viper build for the texas mile. Again, no "oil timing issues"?!? \:D/ I'm just gonna stop there, but I will say it's quite evident,...
by BobbyB
Fri Dec 06, 2019 2:22 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 275
Views: 9295

Re: when are 3/4 grooved main bearings needed for bbc ?

Is there any way to get the paper without paying $30.00? The preview you posted is great. Thanks! SAE members are charged less. A cautionary tale: In 2011, Swartz was arrested by Massachusetts Institute of Technology (MIT) police on state breaking-and-entering charges, after connecting a computer t...
by BobbyB
Fri Dec 06, 2019 1:25 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 275
Views: 9295

Re: when are 3/4 grooved main bearings needed for bbc ?

There is at least a dissertation worth of discussion here. Multiple SAE papers discuss aspects of this set of problems. There are many theses written on aspects of these problems. That's quite a core dump. Start with SAE 750051: Mercedes discusses a V8 series from the 1960s further developed in the...
by BobbyB
Fri Dec 06, 2019 11:43 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 275
Views: 9295

Re: when are 3/4 grooved main bearings needed for bbc ?

I believe damage occurs in rod bearings at 30% (might be lower) and mains at 50%. The big issue is free air -- dissolved air levels can be quite high (about 9% by volume per bar). However, for an oil pump to accomplish this the oil bubbles need to be small. https://www.sae.org/publications/technica...
by BobbyB
Fri Dec 06, 2019 6:01 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 275
Views: 9295

Re: when are 3/4 grooved main bearings needed for bbc ?

Isn’t all this stuff just branch circuits in a simple hydraulic system...just one pump...right? No. Even the simplest hydraulic system is a 'closed' system. An engine oil system is one big leak. Oil leakage around the lifters has a much bigger impact than most realize. You can download this CRC Han...
by BobbyB
Thu Dec 05, 2019 2:08 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 275
Views: 9295

Re: when are 3/4 grooved main bearings needed for bbc ?

BobbyB: I will take a shot at your 2 questions from above. What is quality oiling? 1. Enough quality oil in the reservoir ( be it wet sump or dry sump) so that the oil pump never draws air. 2. Minimizing the amount of air introduced into the oil by proper oil pan design, baffling etc. . 3. Separati...
by BobbyB
Thu Dec 05, 2019 2:02 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 275
Views: 9295

Re: when are 3/4 grooved main bearings needed for bbc ?

Isn’t all this stuff just branch circuits in a simple hydraulic system...just one pump...right? No. Even the simplest hydraulic system is a 'closed' system. An engine oil system is one big leak. Oil leakage around the lifters has a much bigger impact than most realize. Thanks Tenxal, Is it safe to ...
by BobbyB
Wed Dec 04, 2019 7:37 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 275
Views: 9295

Re: when are 3/4 grooved main bearings needed for bbc ?

To simplify things, just think about the passage past the centerline of the crankshaft. There are different possible drillings that can create more or less drama to that point, of course. The wall of the passage is rotating about the central (longitudinal) axis of the crankshaft and so a vector com...
by BobbyB
Wed Dec 04, 2019 6:58 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 275
Views: 9295

Re: when are 3/4 grooved main bearings needed for bbc ?

A SBC and SBM can have the sump reservoir in different locations. Many SBMs have a front sump and during drag racing with a stock type pan it is more likely that the pickup opening will vortex to the surface and/or that the oil displaced to the rear will be churned by the rotating assembly. During ...