Speed-Talk is running on www.Speed-Talk.com

IMPORTANT: Update your bookmarks to https://www.speed-talk.com/forum/
(Right-click the URL and select "Bookmark this link")

Search found 4828 matches

by PackardV8
Mon Jan 18, 2021 12:54 pm
Forum: Engine Tech
Topic: Ring Package
Replies: 21
Views: 669

Re: Ring Package

Walter R. Malik wrote: Mon Jan 18, 2021 9:52 am Cylinder bore preparation has a lot to do with how the thinner rings will work.
Walter, thus far, we've had no thin ring sealing problems, but just to make sure we're not overlooking a better way, what is your thin ring bore prep?
by PackardV8
Sun Jan 17, 2021 11:16 am
Forum: Engine Tech
Topic: Ring Package
Replies: 21
Views: 669

Re: Ring Package

My ex partner used to think anything thinner than a 5/64 ring had no place in a towing or high load application, never mind they are made with superior materials and technology, plus the added strength of thicker ring lands. =D> FWIW, we've modified tall-deck 427" BBC pistons for use in a couple of...
by PackardV8
Sun Jan 17, 2021 10:54 am
Forum: Engine Tech
Topic: Holley sniper on engine dyno
Replies: 17
Views: 1162

Re: Holley sniper on engine dyno

Jack you have to admit hitting the key and the engine firing right up without ever touching the throttle is pretty cool in an old car or truck. 8) Nobody will argue the convenience of efi cold starting, but if it "beat" the carb after a couple of pulls the carb wasn't tuned to its potential. Agree,...
by PackardV8
Sat Jan 16, 2021 9:21 pm
Forum: Engine Tech
Topic: Ring Package
Replies: 21
Views: 669

Re: Ring Package

When Total Seal has a market for an ultra thin ring and spacer set that fits the 5/64 grooves, despite being as expensive as hell, that tells you something. NHRA Stock rules mandate factory ring groove sizes, as do some classes of oval track racing, which is presumably why these ring “sets” were de...
by PackardV8
Sat Jan 16, 2021 8:28 pm
Forum: Engine Tech
Topic: Holley sniper on engine dyno
Replies: 17
Views: 1162

Re: Holley sniper on engine dyno

Just asking, how many EFI systems have you paid big bucks for and then a few years later were unsupported by the seller? Just buy our even-better-new-latest-and-greatest is their suggested solution. That's if they are even still in business and answering the phone. Holley has screwed us with several...
by PackardV8
Sat Jan 16, 2021 4:31 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: Stock and hopped Z-28 engines here..
Replies: 64
Views: 3080

Re: Stock and hopped Z-28 engines here..

Back in 1976 our D/S 68 Z/28 ran 116.95 weighing 3125 with driver. . . . I figured it on a chart I found online years ago at about 450 Hp to do that. Does anyone know if thats close or not accurate at all ? The calculator I use says 390 horsepower. FWIW, these as delivered were 95 MPH runners. The ...
by PackardV8
Sat Jan 16, 2021 2:35 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: Stock and hopped Z-28 engines here..
Replies: 64
Views: 3080

Re: Stock and hopped Z-28 engines here..

wwmtlineman wrote: Sat Jan 16, 2021 1:14 pm Back in 1976 our D/S 68 Z/28 ran 116.95 weighing 3125 with driver. . . . I figured it on a chart I found online years ago at about 450 Hp to do that. Does anyone know if thats close or not accurate at all ?
The calculator I use says 390 horsepower.
by PackardV8
Sat Jan 16, 2021 2:26 pm
Forum: Engine Tech
Topic: 4.365 Oil Ring in 4.370 Bore
Replies: 8
Views: 374

Re: 4.365 Oil Ring in 4.370 Bore

Math says the end gap would be .0157" greater. Also, a low-tension ring in a larger bore becomes that much lower tension.

Let's wait to see what those who've actually done it have to say.
by PackardV8
Tue Jan 12, 2021 10:17 pm
Forum: Engine Tech
Topic: polishing a crank
Replies: 16
Views: 981

Re: polishing a crank

Jack could you be more detailed of what you said "production shops have gone to micro-polishing machines" Is micro-polishing done on a special dedicated machine?? Or can micro polishing be done on a regular crankshaft polishing machine but using a extra fine polishing belt. Could you clear this up ...
by PackardV8
Tue Jan 12, 2021 10:33 am
Forum: Engine Tech
Topic: polishing a crank
Replies: 16
Views: 981

Re: polishing a crank

Interestingly, most production shops today have gone to micro-polishing machines for better dimensional control. The micropolishing does not remove a measurable amount of material. Even more interesting, they get complaints from customers that the micro-polished journals are not as pretty and shiny ...
by PackardV8
Sun Jan 10, 2021 3:02 pm
Forum: Engine Tech
Topic: Cheap aluminum cylinder head castings-Chop'N'Swap project.
Replies: 5
Views: 665

Re: Cheap aluminum cylinder head castings-Chop'N'Swap project.

An interesting project and it would be fun to work along with you. My machinist would then hate us both for once again getting into such weird shite. Any non-import engine shop junks cracked SBC heads daily. The problem with using one of those instead of the actual aftermarket castings you plan to u...
by PackardV8
Sun Jan 10, 2021 2:29 pm
Forum: Engine Tech
Topic: removing rust from cam lobes?
Replies: 5
Views: 627

Re: removing rust from cam lobes?

Too many variables to answer that question with a yes/no/maybe. Flat tappet or roller? Solid or hydraulic? Stock/street or race? New or reground? Warranty or as-is-where-is-take-your-chances-swap-meet? In the obsolete engine business, it's usually low spring pressures, low RPM and that's the only ca...
by PackardV8
Sat Jan 09, 2021 9:31 pm
Forum: Engine Tech
Topic: Piston Design Questions
Replies: 38
Views: 1046

Re: Piston Design Questions

Jack, Can you calculate the area ratio of those pistons, and the clearance that you run? Hi, David, It's been several years since that Packard V8 build went into my Studebaker pickup. The only spec I remember today is .005" deck height and a .025" steel shim head gasket. Seems tight, but it's a rel...
by PackardV8
Fri Jan 08, 2021 3:55 pm
Forum: Engine Tech
Topic: Most Power from Stock 400-509 casting?
Replies: 21
Views: 1126

Re: Most Power from Stock 400-509 casting?

In 1970 I doubt they were even worried about the performance side in mass production of the 400ci block. For true. In 1970, if you wanted performance, GM would sell you a big block. The vast majority of the 400" SBCs were two-bolt main, 2-bbl carburetor, single exhaust; just people movers, never pl...
by PackardV8
Fri Jan 08, 2021 2:51 pm
Forum: Engine Tech
Topic: Piston Design Questions
Replies: 38
Views: 1046

Re: Piston Design Questions

The clearance from piston to head is only one part of the squish velocity equation. What is of even more importance is the squish area ratio of the piston/head interface. which has a strong influence on squish velocity. And the shape of the squish area which determines the direction of the squish j...