Don Terrill’s Speed-Talk

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...

'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...

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

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...

I'd use a woodruff key cutter ......

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...

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...

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

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

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 ...

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...

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...

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...

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...

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