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Messages - WConley

Pages: [1] 2 3 ... 78
1
FE Technical Forum / Re: Quench
« on: March 31, 2024, 09:45:16 AM »
My untouched Ford cammer block was way off square when I had the shortblock rebuilt.  One deck was 0.026" off, so I believe what Brent is saying. 

I also worked in a Ford engine plant.  The maintenance on the big machines was minimal at best!  Often we had parallel machining lines and when one went down we would scrounge used spare parts from the other one to get running again.

2
FE Technical Forum / Re: valve float @5000
« on: March 30, 2024, 11:56:23 PM »
Quote from: machoneman on March 30, 2024, 03:16:31 PM
Hey, Bill! Can you repost a few of your SOHC spring vids again? They were so cool and with the passage of time, I'll venture newer members never saw them.

Sure!  Give me a couple of days to get some family out of town and then dig the videos up.

3
FE Technical Forum / Re: valve float @5000
« on: March 29, 2024, 10:10:11 AM »
Quote from: PetesPonies on March 29, 2024, 12:43:16 AM

Amazing what just a 1/16" of extra squeeze will do for you  :) Good info for people to use as research!!

What's probably happening is that he's getting closer to coil bind at full lift.  My work years ago on the SOHC valvetrain showed how this quiets down the surging motion of the spring coils at high rpm.  I found that setting up for around 0.050" from coil bind at full lift gives you the full benefit while staying safe.  The NASCAR guys run about 0.003" from coil bind  :o :o

4
Non-FE Discussion Forum / Re: Calliope Engine Project
« on: March 16, 2024, 08:47:45 PM »
For small misalignments, beam couplings are really good.  They have no backlash and they're quite stiff in torsion:


5
Non-FE Discussion Forum / Re: Calliope Engine Project
« on: March 15, 2024, 10:08:57 AM »
They had some really cool machinery at Ford's EMDO (Engine Manufacturing Development Operations) Building, where most of that original stuff was made.  Gun drilling stuff like that was a breeze for those guys. 

When I was there they were experimenting with super high speed gun drilling of 5.0 block oil galleries.  The ceramic drills had 5,000 psi coolant coming out the tips, and they would run the length of the block in under three seconds  :o  It was exciting when things went pear-shaped though.  The room walls and ceiling looked like someone had been tossing grenades in there.

6
Non-FE Discussion Forum / Re: 390 on the run stand (not mine)
« on: March 13, 2024, 07:39:24 PM »
Quote from: Heo on March 13, 2024, 04:46:30 PM

Found picture



That's nice!!  Good detail work with the mill to get that pocket in there  :D

7
FE Technical Forum / Re: oil gallery
« on: March 11, 2024, 11:20:42 PM »
I'm not sticking my head out on this one!!  8)

It seems that there isn't a bad answer here as long as you're methodical...

8
Non-FE Discussion Forum / Re: Calliope Engine Project
« on: March 11, 2024, 11:15:06 PM »
Super cool!  Glad it's working out so well  ;D

9
FE Technical Forum / Re: Who Made this Rod?
« on: March 07, 2024, 07:54:32 PM »
A high performance fastener, like a 12-point, will in general have more bearing area than a socket head cap screw.  The hardware store six-point Grade 8 you're comparing to isn't suitable for a critical application.

I don't care about showing people that I'm right.  All I care about is keeping people reading this forum from getting bad information.  In mechanical engineering practice, you will not see socket head cap screws used in critical, high performance joints.  They are inferior to the external Torx or 12-points that are in all of the specialty / racing / military / aerospace applications.  Those are what you want.

10
FE Technical Forum / Re: Who Made this Rod?
« on: March 07, 2024, 10:56:48 AM »
Forgive me Jay, but I need to flex a bit.  This has turned into a pretty nerdy argument, but I don't want people reading this thread to come away with dangerous information.

Yes a standard inch-series steel socket head cap screw has roughly 20% higher tensile strength than a typical grade 8 bolt.  A big reason for that is so the head doesn't explode when you try to torque it.  (The internal hex drive wants to split the bolt head.)   You can't use anywhere near that strength to generate clamp load in the joint.  The small head limits the maximum clamp load too. 

Take that same 20% higher tensile steel and put a proper external Torx or 12-point head on the screw, or even a standard external 6 point hex head.  Then put it on a dynamic fastener "Junker" test machine.  The results will blow away the original Allen cap screw. 

I have a few qualifications too:

- Masters Degree in Mechanical Engineering - Machine Dynamics.
- Passed the Professional Engineer License Exam (which was full of questions about fasteners).
- Cylinder Head Systems Engineer at Ford.  A BIG part of my job was high performance fasteners.  No, you will never find an Allen socket head cap screw holding down a modern automotive cylinder head.
- 35 years experience in machinery design.
- Oh yeah, I'm a very experienced machinist too.  A big part of my current business is building prototypes of my designs using manual mills and lathes, as well as my Haas CNC mill.



11
FE Technical Forum / Re: Who Made this Rod?
« on: March 07, 2024, 01:45:52 AM »
Quote from: frnkeore on March 06, 2024, 08:46:12 PM
Allen (SHCS) are 13% stronger than grade 8 bolts.

Frank - That's not correct.  The "strength" is in the material, not the bolt head shape.  I can buy Allen head socket cap screws made out out of Nylon.  Jay is right about the cracking issue, plus the internal hex drive / thin walls cannot handle the drive torque needed for good clamp load in a high performance application.  The bearing area under the screw head is also too small to support much clamp load.

You'll never see these six-point socket cap screws in any critical machinery application where they are required to maintain a high clamp load.  That's why I'm really puzzled by those rods...




12
FE Technical Forum / Re: Who Made this Rod?
« on: March 06, 2024, 07:37:00 PM »
In my opinion, Allen head screws do not belong anywhere near a connecting rod.  You won't even find those on a lawnmower!!  You can't get anywhere near the torque / clamp load needed for heavy use. 

Makes me scratch my head about what these were intended for.  The rest of the rod looks pretty stout, but the fasteners  ??? ???

13
Non-FE Discussion Forum / Re: Lazy sunday
« on: February 27, 2024, 07:41:15 PM »
Quote from: cjshaker on February 27, 2024, 03:17:26 PM

Yep, those are power line insulators. Got a collection of them myself. Kids today would probably think they're butt plugs.

I see some "knob-and-tube" insulators from old house wiring.  My house is from 1927, and that's what they did back then.  You hammer in the "knobs" to run wires along the ceiling joists, then drill holes and put ceramic insulator "tubes" to pass wires through the joists.  Then you drop down the walls to switches and outlets.  It was cotton insulated wire, with no separate ground!

We had to completely re-wire our house when we bought it.  Don't even get me started on replacing galvanized pipes and clay sewer lines...  >:(

14
Non-FE Discussion Forum / Re: Strange thunder
« on: February 27, 2024, 07:32:14 PM »
I live next to Long beach airport.  Boeing used to maintain a repair depot there for the B1-B.  They would replace the huge (truck tire-sized) Teflon pivot bushings for the airplane's swing wings.

I had a friend at Boeing who would tell me when a B1-B was going to be flying out.  They would usually leave in the evening at full military power (afterburners blazing).  Man the noise and the sight of those shock diamonds in the exhaust was something to behold!

15
Non-FE Discussion Forum / Re: Lazy sunday
« on: February 26, 2024, 01:44:11 PM »
Quote from: FrozenMerc on February 26, 2024, 01:18:35 PM
Tonka, one of the best things to ever come out of the great state of Minnesota.


I have fond memories as a kid of my green Tonka dump truck.  That thing had a hard life!  One day my mom was coming home from shopping in her '71 Ford Country Squire wagon.  Going down Parade Hill Road, she got passed by my Tonka dump truck - loaded with my sister's Barbie dolls - on fire!

The truck lived on quite a while after that.  My butt assumed the same color as my Tonka fire engine later that evening  ::) ::)

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