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Search found 755 matches

by jsgarage
Wed Feb 08, 2023 6:00 pm
Forum: Engine Tech
Topic: Power doesn't matter, valve springs ?
Replies: 27
Views: 832

Re: Power doesn't matter, valve springs ?

Last thing I heard, T Willy moved into assisted living in Carson City, NV after auctioning off all his invaluable cam stuff a few years ago. Marco still lives in n. NV.
by jsgarage
Thu Jan 26, 2023 3:32 pm
Forum: Engine Tech
Topic: 5/64 rings - 60/40 valve split heads
Replies: 9
Views: 543

Re: 5/64 rings - 60/40 valve split heads

Can't help much on cast ring ring mods- it sound like grinding sawed silicon wafers flat prior to printing and cutting computer chips off them. But a few companies make steel ring-spacers to go from your last-century 0.078" ring grooves to modern thin rings. Some spacers are even grooved for gas pre...
by jsgarage
Thu Jan 26, 2023 3:15 pm
Forum: Engine Tech
Topic: Oil & Coolant Temp Correlation; Oil Sump vs. Bearing Temp Coorelation?
Replies: 4
Views: 293

Re: Oil & Coolant Temp Correlation; Oil Sump vs. Bearing Temp Coorelation?

Sometime later in the last century, a major oil company published a paper on that. They were working on documenting the value to customers of synthetic oils, so they instrumented a small block Chev with temp sensors in at least two cam bearings (easy) two main bearings (almost as easy) and two rod b...
by jsgarage
Wed Jan 25, 2023 4:17 pm
Forum: General Tech
Topic: Hobbs Switch Adjustable?
Replies: 3
Views: 270

Re: Hobbs Switch Adjustable?

I adjusted one for an '80s Ford A/C. You'll have to kluge a tee fitting up to apply pressure with a gauge, to see what the effect is, turning the screw either way. Do not expect it to be linear- 1/8 turn might vary 1 lb while 1/2 turn might be 4 lbs.
by jsgarage
Wed Jan 25, 2023 4:08 pm
Forum: General Tech
Topic: Shelf Life of Zero Clearance Sealants
Replies: 4
Views: 257

Re: Shelf Life of Zero Clearance Sealants

Used to work for a NASA contractor and was present when they were scrapping two sealed cases of 8 oz red Lock-Tite. NASA requires an 'expiration date' on EVERYTHING liquid, probably including water. I asked to help by carrying the stuff out to my car. Used it for raffle prizes at car clubs and never...
by jsgarage
Mon Jan 23, 2023 10:14 pm
Forum: Engine Tech
Topic: Mating Two V8's, ( Freight Train) vs. Harmonics
Replies: 34
Views: 1458

Re: Mating Two V8's, ( Freight Train) vs. Harmonics

Can't remember now-its been quite a while. The Ford GT-90 cocept car had a V-16 with two V-8 blocks welded together but the details of the build escape me.
by jsgarage
Tue Jan 17, 2023 3:33 pm
Forum: Engine Tech
Topic: Timing chain tensioner
Replies: 8
Views: 519

Re: Timing chain tensioner

Porsche has tried maybe 12 different varieties of hydraulic-loaded cam chain tensioners on their 911s over the years. Most serious racers lock them solid with a bolt because they are just not reliable. Conditions inside the crankcase are awful for that mechanism. I'd look for a better design or just...
by jsgarage
Wed Jan 11, 2023 4:53 pm
Forum: Engine Tech
Topic: 1206 std pushrod location
Replies: 18
Views: 729

Re: 1206 std pushrod location

Something that's bothered me a little since the '60s: why do many engine builders let the intake gasket manufacturer dictate the size of an engine's intake ports? Is there really any deep science in the sizes & shapes they provide? Or is it just that the gasket provides a convenient stencil? If that...
by jsgarage
Sun Jan 08, 2023 2:59 pm
Forum: Engine Tech
Topic: OEM Non Roller Rocker Arm to Valve Tip
Replies: 24
Views: 614

Re: OEM Non Roller Rocker Arm to Valve Tip

And speaking of Jack's "first principles", what OD is the 318 valve stem you're thinking about using? Seems like you'd have more margin to play with before running off the end or digging in with a BBC's 3/8" valve stem, and practically none using a go-fast LS's 7mm stem OD. My Ford uses 5/16" OD Mil...
by jsgarage
Sat Dec 31, 2022 5:33 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: Vacuum advance units VC31? VC25? VC221? What does this mean?
Replies: 20
Views: 662

Re: Vacuum advance units VC31? VC25? VC221? What does this mean?

The nice thing about Ford distributors is, units 1957-1982 (approx) fully interchange including internal parts. The bad part is, NONE of the piece-parts are available separately from anyone, so do NOT lose any! I am unaware of any listing that tells you what results come from what parts. Many pricy ...
by jsgarage
Fri Dec 30, 2022 3:04 pm
Forum: Engine Tech
Topic: FT cam, Lobe Spec
Replies: 11
Views: 673

Re: FT cam, Lobe Spec

Ford, back in the late 60s/early 70s in their short-lived OHO Newsletter (Off-Highway Only- predated SVO) mentioned releasing some 80" base-radius lifters for racing. They didn't specify what the advantage was supposed to be, but in the announcement Ford cautioned that the lifters were only compatib...
by jsgarage
Fri Dec 30, 2022 2:52 pm
Forum: Engine Tech
Topic: Pontiac SD4 801 Head and Valvetrain Parts
Replies: 11
Views: 884

Re: Pontiac SD4 801 Head and Valvetrain Parts

Huffacker Engineering did some work on the 4 cyl SD during GM's attempt at the under-2 liter class in road racing. Unfortunately, one of my friends that got one of the 3 or 4 tube framed SD Fieros only kept the body/frame/suspension.
by jsgarage
Fri Dec 30, 2022 2:41 pm
Forum: Engine Tech
Topic: AN vs 45 degree fittings
Replies: 22
Views: 932

Re: AN vs 45 degree fittings

Aerospace AN fittings are red or blue-anodized 6061 aluminum, or shiny stainless steel (may be 413-alloy; can't remember now). Both weld well, as long as you're not concerned about losing the original 3000 psi (>4000 psi burst) pressure rating. A couple of the ss in my stock are welded as-received f...
by jsgarage
Fri Dec 23, 2022 3:30 pm
Forum: Vintage/Classic/Historical Engine Tech
Topic: Neat one came in for a build
Replies: 12
Views: 1347

Re: Neat one came in for a build

(Bigchief) Still running the blower? If so, I'd suggest not running the lightweight crank.

I agree with Bigchief- I think you'll snap the nose off a lightweight crank driving a Jimmy from there.
by jsgarage
Fri Dec 23, 2022 12:52 pm
Forum: Engine Tech
Topic: Light weight wrist pins ?
Replies: 22
Views: 946

Re: Light weight wrist pins ?

I remember Grumpy Jenkins having problems when shortening pins in his hi-rpm SBCs. In his book, EVERY TIME he shortened pins, he got broken parts. Never did explain it, he just stopped shortening them. 'Course that was 50 years ago