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Search found 196 matches

by leahymtsps
Tue Dec 10, 2019 5:35 am
Forum: Engine Tech
Topic: 2 BBC rear main seal questions
Replies: 6
Views: 397

Re: 2 BBC rear main seal questions

It will depends on how flat the edges of the cap to block mating surfaces are. When I block prep a BBC I'am very careful not round these surfaces when deburring. At one time I had a employee prepping the blocks, we had a rash of leaks, I always put the seal in flush, I got rid of the employee and t...
by leahymtsps
Mon Dec 02, 2019 6:28 am
Forum: Engine Tech
Topic: when are 3/4 grooved main bearings needed for bbc ?
Replies: 272
Views: 7459

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 leahymtsps
Fri Nov 01, 2019 7:06 pm
Forum: Engine Tech
Topic: Smaller mains sbc
Replies: 14
Views: 948

Re: Smaller mains sbc

Little Mouse wrote:
Fri Nov 01, 2019 10:07 am
tenxal wrote:
Thu Oct 31, 2019 8:41 am
I'm using a 2.450 crank cut down to 2.300 in a Dart SHP block with no issues. Make note of the oil holes being centered, as mentioned by BLOCKMAN.
Shp block has 2.45 mains how did you accomplish this ?
Clevite MS-1110H bearings

Tom
by leahymtsps
Wed Aug 21, 2019 7:14 am
Forum: Engine Tech
Topic: Crank failure
Replies: 74
Views: 3297

Re: Crank failure

Steve, I have seen one before that a customer brought in. He had used a 9 keyway crank sprocket and you could see the indentation of all of the cutouts all the way around the crank and that was exactly where it broke. Same deal as someone else mentioned, not enough chamfer on the sprocket to allow ...
by leahymtsps
Fri Jul 12, 2019 7:17 am
Forum: Engine Tech
Topic: Woodruff key question...
Replies: 28
Views: 1029

Re: Woodruff key question...

Thanks for the tip guys. I'm going to keep an eye on the balancer bolt for tension. I think I'll look into doing something like you guys suggested and see what I can come up with to use a different system for the fuel pump and alternator drives over the off season. I run a MSD crank trigger... so t...
by leahymtsps
Thu Jul 04, 2019 6:40 am
Forum: Engine Tech
Topic: Cranking pressure up and DCR down - How to ???
Replies: 20
Views: 994

Re: Cranking pressure up and DCR down - How to ???

The other part of the equation is do all gauges read the same? :)
[/quote]

I've got 2 testers with different length hoses and they can read 15 lbs. +
difference, depending on cu. in of the engine being tested.

Tom
by leahymtsps
Tue May 21, 2019 6:34 am
Forum: Engine Tech
Topic: cranking compression and gear reduction starters
Replies: 12
Views: 1289

Re: cranking compression and gear reduction starters

The calculator I used gave a bit less at 158psi but similar engines I've built crank 200+ psi on stock starter, which is why I suspect the gear reduction starter plays a role. Cranking speed can have a big effect on cranking compression. People have been circumventing cranking compression rules by ...
by leahymtsps
Mon May 13, 2019 7:06 am
Forum: Engine Tech
Topic: No valve cover breathers?
Replies: 20
Views: 1558

Re: No valve cover breathers?

Morning Jay, The way you are describing it is it has a breather on the tank and is venting, but the way I'm telling it is there was no breather on the tank. The tank had a line that should have run to a breather but he ran it to the v/c instead, completely sealing the system less the leaks. I've see...
by leahymtsps
Sun May 12, 2019 7:14 am
Forum: Engine Tech
Topic: No valve cover breathers?
Replies: 20
Views: 1558

Re: No valve cover breathers?

MadBill wrote:
Sat May 11, 2019 11:08 pm
Warp Speed wrote:
Sat May 11, 2019 8:12 am
..That was the way it was done in the early 90s.
Do you jest Warp, or do I misunderstand the OP? It reads to me that there is no path to atmosphere for blow by gases... #-o
Morning Bill
That's exactly the way he had it, completely sealed and not vented to atmosphere.

Tom
by leahymtsps
Sat May 11, 2019 6:25 am
Forum: Engine Tech
Topic: No valve cover breathers?
Replies: 20
Views: 1558

Re: No valve cover breathers?

A few yrs. back I had someone bring in a BBC with no breathers and a 12 fitting welded into the
valve cover. I asked what the fitting was for and the response was

"I run the vent line from the oil tank to the v/cover to keep it sealed up!"

Needless to say it had several leaks.

Tom
by leahymtsps
Tue May 07, 2019 6:33 am
Forum: Engine Tech
Topic: Dart SHP block questions
Replies: 13
Views: 1008

Re: Dart SHP block questions

Lizardracing wrote:
Mon May 06, 2019 9:42 pm
Are they all 1 piece rear main seal?
No

Tom
by leahymtsps
Fri Apr 12, 2019 6:49 am
Forum: Engine Tech
Topic: Dry Sump Suction lines
Replies: 9
Views: 658

Re: Dry Sump Suction lines

Personally I use Brown and Miller and they claim you should use their braded stainless especially if more than
20". I do know there are some running their hi - temp non stainless below 15".
Some in Nascar are drawing up to 28" with the oil pump.

Tom
by leahymtsps
Wed Apr 03, 2019 5:56 am
Forum: Engine Tech
Topic: Pulling truck engine "again" BBC
Replies: 127
Views: 13137

Re: Pulling truck engine "again" BBC

Randy [/quote] You may already know and I am not sure if it makes a difference but there are 2 Q16's and 2 VP 113's the standard ones are oxygenated with Ethanol based ETBE and the ones marked Q16-REG VP113-REG are Oxygenated with Methanol based MTBE. [/quote] Morning, The reason for the 2 different...
by leahymtsps
Tue Apr 02, 2019 6:23 am
Forum: Shop Equipment - For Sale or Wanted
Topic: Wanted: Bore Gage
Replies: 13
Views: 1597

Re: Wanted: Bore Gage

In looking over the two side by side, the Mitutoyo requiring three shafts to cover .75" - 6", where Sunnen can do it all with one would be the deciding factor for us. Jack, exactly what Sunnen gauge will measure from .75" - 6"? It takes me 3 and they require 2 different setting fixtures 6000 -.740 -...
by leahymtsps
Thu Mar 28, 2019 6:29 am
Forum: Engine Tech
Topic: before/after 383 dyno results
Replies: 492
Views: 29142

Re: before/after 383 dyno results

VP blue is C12. VP blue is a spec fuel for some dirt classes in the north east is what vp tells me. Randy DIrt specs VP D-12 as their spec fuel for BB modifieds. It's dyed yellow though, not green like the C-12 is here. According to VP, it's the same fuel, just a different color per Dirt's request....