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Search found 234 matches

by j-c-c
Fri Dec 13, 2019 1:00 am
Forum: Engine Tech
Topic: Engine oil temps
Replies: 55
Views: 1919

Re: Engine oil temps

So this question makes me wonder, underside piston oilers with the main purpose of cooling the piston, would seem to benefit from lower temp oil, sio why or maybe how common is it to use a separately plumbed off the main supply and then externally Air to oil cooled for the piston spray circuit? The ...
by j-c-c
Sat Sep 07, 2019 10:21 pm
Forum: General Tech
Topic: This can be dangerous
Replies: 15
Views: 1214

Re: This can be dangerous

Okay for the airing up, but what if it decides to go while installing it? But drivers will drive along side feet away, for miles on end, of a fully load 18 wheeler semi, in the heat, doing 70mph, windows open, but not me. Its also my belief often reported "explosions" during a large truck fire, are...
by j-c-c
Tue Sep 03, 2019 5:28 pm
Forum: Engine Tech
Topic: What's the ideal injector trajectory angle?
Replies: 39
Views: 1639

Re: What's the ideal injector trajectory angle?

I just read Dollar Tree (iirc) has to pay $1.2M in restitution in new york state for selling motor oil that "isn't appropriate of any engine manufactured after 1930" I think is what it said. When money is involve people will cheat and lie about anything. But in all fairness, since that is likely le...
by j-c-c
Tue Aug 27, 2019 12:30 pm
Forum: Engine Tech
Topic: Titanium solid lifters
Replies: 12
Views: 1073

Re: Titanium solid lifters

Like my Gold rocker arms? :shock:
by j-c-c
Mon Aug 26, 2019 12:53 pm
Forum: Engine Tech
Topic: What's the ideal injector trajectory angle?
Replies: 39
Views: 1639

Re: What's the ideal injector trajectory angle?

Its hard for me to understand how pointing an injector in a performance application at the back of a valve with injector 3-4" away with say a 80% duty cycle and state the goal is max atomization. Seems more like valve cooling and drip injection upon valve opening, which might work fine, but with a d...
by j-c-c
Thu Aug 22, 2019 2:01 pm
Forum: Engine Tech
Topic: Which high performance marine engine builders are at the forefront
Replies: 8
Views: 673

Re: Which high performance marine engine builders are at the forefront

I would thought this would be an interesting topic and informative as to the unique? issues these engines deal with.
by j-c-c
Mon Aug 19, 2019 7:26 pm
Forum: Engine Tech
Topic: Why haven't we moved to higher DC voltages?
Replies: 37
Views: 1402

Re: Why haven't we moved to higher DC voltages?

Interesting, I suspect over time the "V" thresholds have lowered, as more lawyers arrive.
I also wonder if the "35" was chosen intentionally as if they had chosen say "11" as the threshold.
Somebody wants this idea to go away?

Somebody should have caught my blatant/stupid "w*V" miss type. #-o
by j-c-c
Mon Aug 19, 2019 1:07 pm
Forum: Engine Tech
Topic: Why haven't we moved to higher DC voltages?
Replies: 37
Views: 1402

Re: Why haven't we moved to higher DC voltages?

I believe the use of "shock" is rather subjective here. Accidentally shorting out the terminals on a fully charged Group 24 battery will "shock" anyone nearby, with noise, surprise, light flash, heat,etc, that they will not care much about whether they actually conducted any electrons thru their bod...
by j-c-c
Mon Aug 12, 2019 4:31 pm
Forum: Engine Tech
Topic: Why haven't we moved to higher DC voltages?
Replies: 37
Views: 1402

Why haven't we moved to higher DC voltages?

Not a direct "engine" issue, but certainly engine related, and the automotive world has been stuck on 12 v for over 50 years after saying goodbye to 6V.. I can't think of many reasons why we haven't moved up to say 24, 36 or even maybe 48V. I mean wiring costs, less weight, loom size, better connect...
by j-c-c
Sat Jun 29, 2019 8:32 am
Forum: Chassis / Suspension / Body
Topic: Pad 4 Wheel Scales use
Replies: 5
Views: 571

Pad 4 Wheel Scales use

Two questions: 1. How sensitive are the weights measured realtive to the scales being level? I mean are we talking a2 lbs or 20 lbs or more with how much off level on say a 3000 car? Additionally, is it water level the goal, or all the scales on the same plane a more important goal? 2. On the 15" Al...
by j-c-c
Wed Jun 19, 2019 7:20 pm
Forum: Engine Tech
Topic: Why not?: Flywheel as crank position sensor
Replies: 48
Views: 2657

Re: Why not?: Flywheel as crank position sensor

That strategy isn't limited to diesel engines. I have a fuel-injected single cylinder Honda motorcycle engine, and a two-cylinder 180-degree-crankshaft Yamaha motorcycle engine (thus having an uneven firing order), which only have a crank sensor. Any engine with an uneven firing pattern - V-twins, ...
by j-c-c
Thu Jun 13, 2019 8:54 pm
Forum: Engine Tech
Topic: Why not?: Flywheel as crank position sensor
Replies: 48
Views: 2657

Re: Why not?: Flywheel as crank position sensor

Our diesel Generators for decades use flywheel teeth for the electronic governors, they only run 1800rpm, but the FW is a rather large gear, tooth count I don't know. Not sure accuracy is that critical, if there are dropouts or whatever, but they are reliable.
by j-c-c
Sun Jun 09, 2019 7:22 pm
Forum: Engine Tech
Topic: Simple Tunnel ram Question
Replies: 317
Views: 14024

Re: Simple Tunnel ram Question

Wait, I did the math, 180m/s is nearly 400 mph, is that correct? :shock:

But that's in pure vacuum, with zero friction assumed, so we are in the real world not close to that, and gravity "contribution" mentioned is fairly close, correct again?
by j-c-c
Tue Jun 04, 2019 3:36 pm
Forum: Electric & Hybrid Vehicle ** NEW **
Topic: Freightliner (Daimler) predicts end of diesels in big trucks,,!
Replies: 27
Views: 2041

Re: Freightliner (Daimler) predicts end of diesels in big trucks,,!

First thing the trucking industry ought ant to do before total prime power electrification, install roof top solar on every dry freight style trailer, with batteries, incorporate trailer regenerative braking and short term power boost while moving, power grid tie end stations at terminals or when tr...
by j-c-c
Tue Jun 04, 2019 3:25 pm
Forum: Engine Tech
Topic: New look for Speed Talk, coming soon
Replies: 71
Views: 4442

Re: New look for Speed Talk, coming soon

Forget Everything I ever said about you, I was just kidding. :lol: