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Search found 1227 matches

by digger
Thu Oct 10, 2019 10:37 pm
Forum: Engine Tech
Topic: Artificial Intelligence to Design Lightweight Parts
Replies: 30
Views: 908

Re: Artificial Intelligence to Design Lightweight Parts

exhaustgases wrote:
Wed Oct 09, 2019 5:47 pm
Just curious is that what they used to design those cracking parts on the 737NG? I still think the old slide rule dudes in the past had a better handle on stuff.
i agree we should all fly on comets
by digger
Wed Oct 09, 2019 12:26 am
Forum: Engine Tech
Topic: Artificial Intelligence to Design Lightweight Parts
Replies: 30
Views: 908

Re: Artificial Intelligence to Design Lightweight Parts

modok wrote:
Wed Oct 09, 2019 12:20 am
Must have been one of the fixed constraints.
reading the OP properly it looks like it. there must be a way to have constraints but in such a way as they arent excessively specific
by digger
Wed Oct 09, 2019 12:18 am
Forum: Engine Tech
Topic: Artificial Intelligence to Design Lightweight Parts
Replies: 30
Views: 908

Re: Artificial Intelligence to Design Lightweight Parts

I've done a lot of FEA over last 20 years I don't agree that the relatively tight scallops to clear the retainer are the optimum especially with low dress area adjacent. You shouldn't see large gradients
Is it for strength as in proof load or fatigue ?
by digger
Tue Oct 08, 2019 11:22 pm
Forum: Engine Tech
Topic: Artificial Intelligence to Design Lightweight Parts
Replies: 30
Views: 908

Re: Artificial Intelligence to Design Lightweight Parts

This is an example of what AI can do to optimize the shape of a rocker arm for a target mass. The cylindrical boss areas surrounding the pushrod cup, shaft pivot and roller axle holes are defined before AI begins. All of the other shape is done 100% by AI. Basically, it makes a simple shape like a ...
by digger
Tue Oct 08, 2019 8:18 pm
Forum: Engine Tech
Topic: flywheel to balancer weight proportion- inline 6
Replies: 45
Views: 1339

Re: flywheel to balancer weight proportion- inline 6

if you are talking the torsional deflection (twist) then its mass moment of inertia that is important, not mass.

i gather the issue may be a coupling of twist with a small amount of bending? in which case the translational mass (mass) is relevant to some extent
by digger
Tue Oct 08, 2019 5:07 pm
Forum: Engine Tech
Topic: flywheel to balancer weight proportion- inline 6
Replies: 45
Views: 1339

Re: flywheel to balancer weight proportion- inline 6

Is the consensus that the rod rotating mass is influential on the harmonics i.e it produces a similar effect to lumping the rod rotating component mass on the crank? This would theoretically increase the mass moment of inertia of the system without changing the torsional or bending stiffness thereby...
by digger
Sat Oct 05, 2019 9:07 pm
Forum: Engine Tech
Topic: Note on Weber carbs by Mr. Passini
Replies: 27
Views: 923

Re: Note on Weber carbs by Mr. Passini

on a 6 cyl i bolt the pairs of manifolds using a template and ensure the surface to mount throttles is flat/planar. then mount throttles to the manifold using a precision template to ensure alignment and position (i.e. the throttle shafts need to be as concentric as possible). this seems to be impor...
by digger
Wed Oct 02, 2019 11:10 pm
Forum: Engine Tech
Topic: Coating Air cooled pistons
Replies: 37
Views: 1068

Re: Coating Air cooled pistons

And how do you know it will do that rather than increasing the cylinder pressure and so transmitting more force to the piston? that's what detonation does? logic suggests that if you're knock limited then there's not much benefit to coated other than reducing exposure of parts to some heat but cyli...
by digger
Wed Oct 02, 2019 7:11 am
Forum: Engine Tech
Topic: When are you switching to synthetic?
Replies: 79
Views: 3038

Re: When are you switching to synthetic?

Why does everyone say that like a bandaid is a bad thing? I'm sporting a 2" square one right now that is all that remains of the 10" specimen that was protecting an abdominal incision incurred during a recent internal plumbing repair.. :? It's a cover for a cut you got when you could not actually d...
by digger
Tue Oct 01, 2019 11:19 pm
Forum: Engine Tech
Topic: When are you switching to synthetic?
Replies: 79
Views: 3038

Re: When are you switching to synthetic?

Same thing with TEL, now we have millions of water vapor makers on the streets and we are going to die by the second tuesday of next week Uh, lead has A LOT of documented and verified public health effects. No doubt some are suffering from it here! Go figure the manufacturers have figured out to ma...
by digger
Sun Sep 29, 2019 8:43 pm
Forum: Engine Tech
Topic: Service Life of Steel H-Beam Rods
Replies: 31
Views: 1354

Re: Service Life of Steel H-Beam Rods

The entire bolt sees (essentially) the same load from acceleration. Without doing any calculations, I’d guess that load is minimal, even negligible. I could be wrong. Do the math. I’m just providing some general principles. i'm not sure what you mean but whatever sinusoidal tensile load that the ro...
by digger
Sun Sep 29, 2019 6:35 pm
Forum: Engine Tech
Topic: Service Life of Steel H-Beam Rods
Replies: 31
Views: 1354

Re: Service Life of Steel H-Beam Rods

I’d agree with that as a good rule of thumb. The bolt load should be designed such that the tension in the bolts exceeds the cyclic force they are subject to during operation (thermal stress, mechanical stress) . If that is true, then the only stress cycles they see are from assembly and disassembl...
by digger
Sun Sep 29, 2019 6:19 pm
Forum: Engine Tech
Topic: Service Life of Steel H-Beam Rods
Replies: 31
Views: 1354

Re: Service Life of Steel H-Beam Rods

How many re-torques are too many ? When you mic. (measure the length of the bolt) when it is new, it will be a given length. Each time you remove the rod bolt at disassembly you measure it/them. When the bolt does not check to its original new length it is said that the bolt has yielded (to give up...
by digger
Sun Sep 29, 2019 5:59 pm
Forum: David Vizard forum
Topic: TorqueMaster cam program update
Replies: 30
Views: 1547

Re: TorqueMaster cam program update

i shall wait patiently for this to be applicable to generic (i.e any) cylinder head
by digger
Wed Sep 18, 2019 3:47 am
Forum: Engine Tech
Topic: Spring retainers and locks - mix and match?
Replies: 12
Views: 553

Re: Spring retainers and locks - mix and match?

You want the locks to be supported radially by meaty part of the retainer