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by Warp Speed
Fri Dec 06, 2019 9:55 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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

I think what ClassAct is basically trying to say when comparing oiling systems is that the SBC picks its feed up from the main and oils the rod jrl at around the TDC visinity before the load is the greatest on compression, that spreads the wedge and also gets the rod feed hole out of the way, im no...
by Warp Speed
Fri Dec 06, 2019 4:59 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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

With all due respect to you Classact, i will ask you this question. You have been stating (expressing) the extreme importance of the hole in the crankshaft main journal lining up with the hole in the main bearing/engine block. The question is------------WHY is this so important, what does this allo...
by Warp Speed
Fri Dec 06, 2019 5:07 am
Forum: Engine Tech
Topic: Small Diameter Wrist Pin Life
Replies: 57
Views: 4767

Re: Small Diameter Wrist Pin Life

donclark wrote:
Thu Dec 05, 2019 3:29 pm
Warp Speed wrote:
Thu Dec 05, 2019 9:55 am
donclark wrote:
Thu Dec 05, 2019 7:45 am


They are H13. They are tapered but reach full wall thickness at the point beyond the piston tower.
What's the intended usage?
N/A drag race, 9400 rpm, bore size is 4.180
I'd say that's pushing it a little. The pins we ran it that size range were a minumum .200 straight wall.
by Warp Speed
Fri Dec 06, 2019 5:02 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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 Warp Speed
Thu Dec 05, 2019 10:47 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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 Warp Speed
Thu Dec 05, 2019 9:08 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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

Right. And the leaks around the lifters is a relatively simple fix. It's a simple hydraulic system. Not uncontrolled leaks. That's crazy to claim that. I had a joker call me today and claim you can fix this junk with a dry sump. I said how so? And this dude (a self proclaimed expert) says you're su...
by Warp Speed
Thu Dec 05, 2019 6:44 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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. Right. And the leaks around t...
by Warp Speed
Thu Dec 05, 2019 9:55 am
Forum: Engine Tech
Topic: Small Diameter Wrist Pin Life
Replies: 57
Views: 4767

Re: Small Diameter Wrist Pin Life

The new pistons I have measure 1.220" between the pin bosses. The last set of aluminum rods measured 1.050" wide. Thinking of ordering the next set with a dimension of 1.180" which would give me 0.040" total clearance and support the pin a bit more. Pins are DLC coated 0.787" x 2.225" x 0.185". Any...
by Warp Speed
Thu Dec 05, 2019 5:14 am
Forum: Engine Tech
Topic: Small Diameter Wrist Pin Life
Replies: 57
Views: 4767

Re: Small Diameter Wrist Pin Life

The smaller the clearance between the rod and piston pin tower, the more support the pin has. One of the natural advantages of a piston guided design. With a rod guided strategy, you want the clearance to still be a minimum, without binding rod movement. The new pistons I have measure 1.220" betwee...
by Warp Speed
Thu Dec 05, 2019 4:58 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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

You are still wrong. Figure I out warp. The lifters don't matter. I can block the oil to the lifters and it STILL doesn't fix the issue. Damn you are stubborn. Damn you are clueless! :lol: Maybe you should try a different hobby? I will ask AGAIN, why doesn't a 351w have the same problem as a 351c, ...
by Warp Speed
Wed Dec 04, 2019 7:27 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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

Here is one fact that we can ALL agree on i am sure. The ((("MOST"))) important part of the engine to ALWAYS have quality oiling IS the main and rod insert bearings!. This is WHY making the main bearing bulkheads FIRST and TOP priority with a dedicated main oil gallery IS so important regardless of...
by Warp Speed
Wed Dec 04, 2019 4:47 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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

Oh, ok, third oil galley. Maybe Winner winner chicken dinner! :wink: Something the SBM and Pontiac engines that he references, are missing also. :-k Aka, an efficient, quality supply to the bulkhead feeds................. You are still wrong. Figure I out warp. The lifters don't matter. I can block...
by Warp Speed
Mon Dec 02, 2019 11:30 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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

RCJ wrote:
Mon Dec 02, 2019 10:38 am
If you take it one step farther, how much of the standard 180 degree groove is being used or could be eliminated.
:idea:
by Warp Speed
Mon Dec 02, 2019 9:59 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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

Dodge 340 http://www.engineprelube.com/images/366_newoilgallery-1.jpg Pontiac 400 https://ww2.justanswer.com/uploads/molurch/2009-10-23_004441_oil1.png Do we see a trend in the examples of poor OEM oil systems of the era, as referred to earlier to have a "block oil timing" problem? Various so-calle...
by Warp Speed
Sun Dec 01, 2019 3:50 pm
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 253
Views: 5861

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

Dodge 340 http://www.engineprelube.com/images/366_newoilgallery-1.jpg Pontiac 400 https://ww2.justanswer.com/uploads/molurch/2009-10-23_004441_oil1.png Do we see a trend in the examples of poor OEM oil systems of the era, as referred to earlier to have a "block oil timing" problem? Various so-called...