Don Terrill’s Speed-Talk

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My take on the topic

I agree with Walter, on a low output restricted class engine you might find gains, maybe enough to make it worthwhile ...... it sure livened up the one I played with

One piece 'stainless steel' valves ...... EV8 21-4N or EV16 21-8N ...... generally have poor 'rubbing' characteristics', not uncommon with most materials that have a fair percentage of Nickel Do the stems work as is, yes, as millions of engine attest, do they work better flash coated with chrome, ce...

I also set the 90* off the insert counterbore mic, at a touch under choke As regards 'bowl hogs' etc, or the lack of availability of, I'd maybe source a diamond lap, or use the one on your bar, and 'create' what you need from the natural wastage of cutter bits Waiting for no-existent product from 'a...

The 1" spacer between the carb and manifold on a 225 HP 289 has a 360 deg. lip and the difference between with and without it (the lip) is one of the things I know that gives the most pause for pondering about carb tuning. Tuner, approximately what is the diameter of the 289 spacer hole and what is...

IIRC ...... The 3.8 was a 90* V6, with the common SBF bellhousing pattern, built in Canada ..... 'Essex V6' (not to be confused with the English 2.5/3.0 'Essex V6') The 4.0 was a 60* V6 based on the smaller 2.0-2.9l, built in Germany ..... 'Cologne V6' I think the 4.0 has bellhousing pattern differe...

The alloy of recycled materials seems pretty random; a few of these and a few of those. Probably whatever they happen to get a supply of. Also, who knows what originally went into the materials being recycled. The foundryman's lost art Around here when I was growing up there were still quite a few ...

I think the crux of the matter is whether you're trying to bring the seat, or valve, 'in' by lapping or just trying to create a witness The former is misguided, but I'd aver we've all been tempted to do it, the latter I don't really see a problem with Different aims, different processes, different o...

All this 'holier than though' crap about lapping is just that ....... if you have a process that works for you then by all means use it Wished I had a better pic, roughed out seat, bit more needs to come off the top chamber angle : 20230119_153717.jpg [Dark band at the lower insert in the throating ...

Somewhere in a not to recent post there was a discussion about lapping valves. More of a check to see if the old valve job was still holding up If all you're trying to do is create a 'witness' then use something fine, at least 800 grit You'll get the usual opinions about 'lapping', as if it's all o...

The sleeves will actually have ripples worn into them that you can feel with your fingers on tear down.The pistons do not hang out of bottom of bore a crazy ammount ...... This time we will build with a 3.4 stroke and see what happens Are you putting the 'ripples' down to piston rock, or some kind ...

What is your application? We built and maintain a 374 cid 8.2 deck road race engine for a vintage road race customer that occasionally goes to some outlaw run what you brung events. Dart aluminum block, 3.500stroke, 4.125 bore, 5.400 rod on 2.00 crank pin,1.035 cd, dry sump oiling.. Cylinder wall a...

SRS_Chris I've always found using calipers a ballparking method at best, never had much faith beyond that, and my eyes are still reasonably ok (with reading glasses) If you're using cutters, the seat is what it is ...... if using stones I can understand the question completely, not everyone has wor...

BCjohnny wrote: I've seen plenty of references to 'Tool Steel' lifters ...... but that's all a bit generic

Anyone actually know the material specs ...... A2, D2 tool steel ? M2, M42 HSS ?

Anyone ?

Mummert thanks ....... As regards this : If I thought I could find a cutter good enough to cut those lifters I would make the heads smaller to get them a little lighter PCBN inserts will machine even hardened TSs, but you probably know this already Obviously grinding also, if you can get in ..........

I've seen plenty of references to 'Tool Steel' lifters ...... but that's all a bit generic Anyone actually know the material specs ...... A2, D2 tool steel ? M2, M42 HSS ? Also ...... I think Mummert mentioned a while back swapping the TS lifters from cam to cam, so they obviously don't bed in like ...