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Search found 889 matches

by BCjohnny
Wed Aug 10, 2022 3:15 am
Forum: General Tech
Topic: How are rod/main bearings made?
Replies: 8
Views: 194

Re: How are rod/main bearings made?

Hi BCJohnny, "Interestingly some production applications now use a heavier duty Tri-Metal in the rod, and Al/Sn in the more lightly loaded cap" very interesting indeed. Are those trucks, gasoline, diesel ??? Dan ....... I don't do much 'modern' stuff if I can help it, but the one I've come across i...
by BCjohnny
Sat Aug 06, 2022 7:43 am
Forum: General Tech
Topic: How are rod/main bearings made?
Replies: 8
Views: 194

Re: How are rod/main bearings made?

'Tri - Metal' type bearings usually have the main 'bronze' (usually copper/lead) layer cast (or more recently sintered) onto the steel backing, and a 'flash' plating of a Babbit type material over the whole shell The plating is sometimes omitted in certain HD applications as, being that it's also pl...
by BCjohnny
Thu Aug 04, 2022 2:38 am
Forum: Engine Tech
Topic: Longevity of flat plane crank engine?
Replies: 14
Views: 632

Re: Longevity of flat plane crank engine?

fabr wrote:What was/is the reasoning behind the C8 Vettes going with a flat plane crank?
I'm with the other posters ........ I'd say it likely has more to do with marketing than engineering

The trade offs for a 'street' engine are hardly insignificant ....... JMO
by BCjohnny
Wed Aug 03, 2022 1:33 pm
Forum: Engine Tech
Topic: Longevity of flat plane crank engine?
Replies: 14
Views: 632

Re: Longevity of flat plane crank engine?

Assuming you’re talking about a ‘flat plane’ V8 crank …... If the harmonics are kept in check (dampening) and the fundamental design is good I don’t see any issues over the average expected lifespan of a particular application Why should there be ? ...... there’s more to it, but a FP crank is essent...
by BCjohnny
Thu Jul 28, 2022 3:07 pm
Forum: Engine Tech
Topic: Bearing tangs
Replies: 25
Views: 843

Re: Bearing tangs

I'd use a woodruff key cutter ......
by BCjohnny
Thu Jul 28, 2022 5:00 am
Forum: Engine Tech
Topic: Bearing tangs
Replies: 25
Views: 843

Re: Bearing tangs

In a freshly assembled, correctly clearanced engine, I doubt there's much need for tangs However we've all pulled engines apart, core or for rebuild, where without the presence of tangs the bearings would likely have spun and the whole thing relegated to scrap ....... most evidenced by the tang slot...
by BCjohnny
Wed Jul 27, 2022 2:52 am
Forum: Engine Tech
Topic: Ever seen 8 rods disintegrate at once?
Replies: 23
Views: 1669

Re: Ever seen 8 rods disintegrate at once?

FWIW ..... and assuming the rod has been correctly identified ...... IMG_3812b-Large-300x225-circle.jpeg Absolutely no personal experience, but I for one certainly don't like that type of 'pinned' rod The ability of those four little pins to resist the ability to fret or be torn out of relatively so...
by BCjohnny
Fri Jul 15, 2022 3:40 pm
Forum: Engine Tech
Topic: How far can a piston be run above deck?
Replies: 26
Views: 1688

Re: How far can a piston be run above deck?

Agreed Walter ......

As long as the rings don't come out of the top of the block, and the 'gasket' holds, I wouldn't worry about much

I thought Kaase put that to bed years ago with the EM thing
by BCjohnny
Thu Jul 14, 2022 2:11 pm
Forum: Engine Tech
Topic: Speaking of welding cast iron
Replies: 22
Views: 1413

Re: Speaking of welding cast iron

SchmidtMotorWorks wrote:Molasses sounds too expensive, maybe some mixture of oil and tar?
Linseed oil used to be (is?) commonly used, not sure of price, hence cost effectiveness, these days

With the 'added value' of machining, hence sale of a finished product, maybe the margin is there for most things
by BCjohnny
Wed Jul 13, 2022 2:14 pm
Forum: Engine Tech
Topic: Speaking of welding cast iron
Replies: 22
Views: 1413

Re: Speaking of welding cast iron

I spent about 1,000 times that to build my home foundry, never poured iron Those 'steel toe cap sandal guys' do well with what they've got ....... Is that molasses added to the moulding sand ? I'd have riddled the lining sand first, and then shovelled the rest in The cope and drag look a bit Heath ...
by BCjohnny
Thu Jul 07, 2022 3:44 am
Forum: Engine Tech
Topic: Site issues
Replies: 22
Views: 1012

Re: Site issues

I run Linux too, although it's Ubuntu, on various laptops ...... can't be doing with Windows I use FF & Brave mostly, downloaded IIRC Opera specifically to try to cure the 'problem', but it didn't All the privacy settings are as tight as they can be, so maybe this is having an affect Luckily I'm not...
by BCjohnny
Mon Jul 04, 2022 1:57 pm
Forum: Engine Tech
Topic: Site issues
Replies: 22
Views: 1012

Re: Site issues

Try a different browser, maybe the scripts are not working right Yeah ...... first thing I tried ...... no discernible difference between FF, Brave or even the other one I installed specifically to try to cure the 'problem' For me I doubt it's a browser thing, simply doesn't happen anywhere else th...
by BCjohnny
Sun Jul 03, 2022 1:01 pm
Forum: Engine Tech
Topic: Site issues
Replies: 22
Views: 1012

Re: Site issues

Either copy and paste it before you post, or write it out on Libre/Office/Word and copy and paste that if it's a long tome Saves the temptation to chuck the whole lot outta the window when it gives you the finger ......... #-o Personally I'm more concerned about the interminable delays in loading pa...
by BCjohnny
Mon Jun 20, 2022 3:09 am
Forum: Engine Tech
Topic: Valve Stem Tip Height
Replies: 28
Views: 947

Re: Valve Stem Tip Height

If you're absolutely wedded to the valves , and the don't have separate hardened tips, you need to get some length out of them You've several alignment issues but you need to first re-establish the relationship between the stem end and the shafts, which IMO is the most critical, and deal with the o...
by BCjohnny
Sun Jun 19, 2022 4:20 pm
Forum: Engine Tech
Topic: Calculating journal bearing oiling requirements
Replies: 49
Views: 1572

Re: Calculating journal bearing oiling requirements

mag2555 wrote: ...... other then excess oil from too much rod side clearance ......


Unfortunately as an accurate statement it's pretty much discredited these days

This article outlines currently perceived wisdom on the subject