Questions tagged [engine-theory]

Use this tag when asking questions about the theory of engines. Do NOT use for practical problems, only theoretical questions

24 questions with no upvoted or accepted answers
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82 views

Is there any advantages of the mounting side (left or right) of the motor in a FWD vehicle?

Almost every FWD I have dealt with has the engine on the left side and the transmission on the right. Hondas with the D17 Engine has it the opposite which made me curious. Does the mounting side of ...
3
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2answers
94 views

Do Diesel Injectors Usually Group Fire During Cranking?

While I was doing a virtual compression test on my friends 2010 Peugeot Partner II 1.6 Turbo Diesel I hooked a probe up to an injector so I would have a reference point to know which cylinder is which ...
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0answers
94 views

Would a camless engine need a starter motor?

In theory, if you had a working camless engine with fully variable valves... Would it be possible to just have the engine start itself by choosing the most appropriately placed cylinder at the time ...
2
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1answer
42 views

Gasoline glow engine mechanics

I own a wide array of model engines. Typically those engines are either glow engines using nitro fuel, spark engines using gasoline or "diesel" engines using "kerosene". However I ...
2
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0answers
302 views

Does an oxygen sensor's lambda value represent the same when running on LPG?

I have converted my car to LPG, and i've been tuning it today with a wideband lambda controller. It runs pretty okay, but i'm not yet satisfied. The weird thing is, it accelerated best when the ...
2
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0answers
32 views

How to analyse engine oil analysis results?

I got an engine oil analysis done on my 1991 CAT 3116 with 124,000k miles on it. I received a sheet of what I presume to be the result of some kind of spectrometry. As I'm not an analytical chemist, I ...
2
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0answers
133 views

What would happen if you tried to start an engine with the cam gears meshed

What would happen in the case that someone tried to start an engine like this: My guess would be, if the starter has enough torque to overcome the strength of the cam gear teeth, it'd wreck the cam ...
1
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1answer
39 views

How does Honda ensure the all the pins and holes are lined up when VTEC is activated? Shouldn't they interfere?

If the outside rocker arms are actuated by a different cam profile than the middle rocker arm, how could these pins ever line up? Isn't it likely that the initial outside pin forces itself against the ...
1
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1answer
299 views

Engine braking in an automatic: Does it save fuel?

This is a question more to satiate my curiosity than something I want to apply in practice. It's also my first question here, so apologies in advance if I'm doing anything wrong. I've recently ...
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2answers
1k views

Differences between drive by wire and drive by cable

What are the main differences, advantages, and disadvantages of using a drive-by-wire versus drive-by-cable system?
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0answers
28 views

Optimizing temperature and spark for horsepower

I recently completed a heads+cam project on my car to increase horsepower. I ended up falling about 50hp short of my goal, and am looking for every little knob I can turn to eek out that last little ...
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0answers
65 views

Pencil Coil Operation

Pencil coils are very small. Do they operate on the CDI Principle? I thought that CDI was not good on lean mixtures which are good for fuel economy? Do they operate on the accepted Inductive Discharge ...
0
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1answer
41 views

Camshaft valve clearance and fuel consumption

Does the clearance between the camshaft and the top of valve tappets (AKA lifters AKA shims) affect fuel consumption? I am asking because it seems to me like the lesser the spacing, the more the cam ...
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2answers
58 views

Effect of same engine but with slightly less capacity (cc) and hp

There's a vehicle whose engine is 1332cc which produces 94 hp in its home country. It was recently launched in my country with the same engine, but they downsized it to 1299cc (91 hp) for tax benefits....
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43 views

Why do Tri-Y Headers give more low end torque and struggle at top and why 4-1 Headers give better top end torque?

Everywhere i read says Tri-Y is better for bottom end and that the 4-1 is better for top end. Why exactly is that? I thought Tri-Y would have more top end "breathing" and make more torque at ...
0
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1answer
55 views

Is it true that crankshaft counterweights help with extending the life of the main bearings?

I have heard that use of counterweights in crankshafts also help with bearing life because "counterweights reduce peak main bearing inertia loads". Is this true? If its true how does that ...
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0answers
52 views

How does engine braking mapping work?

Some recent cars and a lot of bikes can change engine mapping and change engine braking electronically. For instance, my bike is not an automatic bike, so it has mechanical gears and I am able to ...
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48 views

How to design an exhaust pipe to increase scavenging at specific RPMs

Good day all. I'm looking for advice on an exhaust design problem. It is easy to find videos explaining exhaust scavenging, but how do you control it? Surely there must be some physics that can be ...
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99 views

Cleaning ground rotor magnets dust and particles after rotor assembly damage

I happen to have an FZ8 motorcycle which is famous in warmer climates like Greece for a very serious failure (along with FZ1 and R1) in the rotor assembly. In many cases the glue holding the magnets ...
0
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1answer
174 views

Car struggles to pull off up hill

Could anyone help with another issue/potential issue I have? When I am parked on a hill, facing upwards, I put my car into first gear and when I pull off it feels as if I am towing something heavy, ...
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0answers
60 views

Does an engine with lower viscosity oil require less warming up?

I have always seen that an engine should be driven gently (low throttle, low revs) for about 15 minutes after starting, in order to bring the oil up to temperature and lubricate the engine properly. ...
0
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0answers
50 views

Which vehicle came with the most different engine cylinder configurations?

A question that cropped up in a discussion today... Most vehicles sold come with one or two different engine cyinder configurations, for example and inline-4 and a V8. Quite a few have three, and a ...
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2answers
313 views

2014 Jeep SRT 6.4L oil filter was too small - what kind of damage?

What possible damage could my engine incur from having an oil filter installed that is smaller than the suggested size? I have damage but I’m interested to hear what this forum has to say about it ...
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2answers
759 views

Could a wind turbine work for a car?

Could I attach a little fan to power a motorcycle alternator to be more efficient then running off the engine? Attach any where facing the wind on the vehicle to increase mileage from eliminating ...