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10 votes
Accepted

Why don't all diesel engines have throttle plates?

tl dr: By adding a throttle plate, it creates the vacuum needed to draw in gasses from an EGR valve. Since diesel engines are designed to run lean, they don't need throttle plates to run. They ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
9 votes

3 rings vs 4 rings pistons: which design is better?

There are trade offs, so no clear answer here. First of all, just to be anal and clear something up ... what you have is actually a 4-ring and a 5-ring piston. The oil control ring at the bottom ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
8 votes

Is anyone working on a battery-powered motorcycle (a real one, not a toy)?

Yes, there are a few Zero Motorcycles have quite a few models that are available for purchase right now. They are up to 67HP and a 197 mile range. Harley Davidson has a model that should be ...
DucatiKiller's user avatar
  • 32.9k
8 votes

Can you recognise this motorcycle?

I believe it's a '41(?) Harley Flathead.
Emmet Vassar's user avatar
8 votes
Accepted

What is a "Z" frame?

A "Z" frame refers to a modification done to what would otherwise be a straight framed vehicle. Here is an image of two frames (done via 3D printing) of what the difference would be: the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
6 votes

Why don't all diesel engines have throttle plates?

Anti Shudder Valve Not a direct answer, but one engine component that many people confuse with a throttle plate on a diesel engine is called an "anti shudder valve". This looks exactly like a ...
JPhi1618's user avatar
  • 13.3k
5 votes

How to not hit the car in front whatever the car?

Once you have driven a few cars for a while you will get used to knowing from walking up to a car and getting in just how big it is. But until that time you can use some useful tricks: parallax: if ...
Rory Alsop's user avatar
  • 18.6k
4 votes

What is the name of this part? (motorcycle)

It's called the "Lower Fairing". It can be seen in the following image: Part Number: 800085775 - Lower Fairing, LH (#19) 800085774 - Lower Fairing, RH (#20)
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes
Accepted

Position of brake calipers different between wheels

I don't believe there is a special placement in consumer vehicles. Most are designed with space in mind and ease of servicing. With the energy being transferred from the spinning rotor to the ...
CharlieRB's user avatar
  • 9,035
4 votes
Accepted

New steering invention

Is this a good idea for a car? I'll cut to the chase - No, it's a crap idea. It's not like a car where there's all kind of ridiculous connections that can all go bad and where the chances of 1 thing ...
motosubatsu's user avatar
3 votes
Accepted

What causes imbalance in vapor seen between dual exhaust tail pipes?

Most "dual" exhausts aren't true dual exhausts. They are dual tipped exhausts. This means there's one pipe coming back from the engine, then feeds into a muffler and then out to two separate tips. ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
3 votes

Can you recognise this motorcycle?

I believe it's a Harley WLD from 1941 or '42. It is clearly their 740 cc engine
nomind's user avatar
  • 131
3 votes

How to not hit the car in front whatever the car?

As said in the other answers, each car is different, and it's mostly experience, if you don't have these little electronic helpers. But I have one trick: Watch the light cones of your front light. As ...
sweber's user avatar
  • 7,057
2 votes

How to not hit the car in front whatever the car?

Every single car is different, most of them have different steering angle, different turn radius, etc. So it's all about getting used to it. But sometimes it doesn't work, especially on a long base ...
Arturs Bolsunovskis's user avatar
2 votes

Anything wrong with this custom brake caliper design?

You assume that the piston fully retracts into the caliper when you release the brake. But that's not true. When the pad wears, it becomes thinner, and the piston moves out to compensate. But when ...
sweber's user avatar
  • 7,057
2 votes

Is anyone working on a battery-powered motorcycle (a real one, not a toy)?

In addition to Zero and Harley there's Brammo. Due to their light weight electric motorcycles compare better as far as range their Internal combustion counterparts than electric cars do. Most will ...
Eric's user avatar
  • 564
2 votes
Accepted

A very simple circuit to supress 12v pulses from illuminating some LEDs

Credit to @Andrew Morton for this answer; which he is happy for me to submit. I simply used PA Soft to disable the checks in the Light Control Module (LCM) by going into "module coding" (or similar?) ...
Toby Wilson's user avatar
2 votes

Advantage of criss-crossed U-bolts

The criss-cross helps prevent the bracket from turning when installed. If they were just straight up and down, the bracket would tend to walk, causing it to turn. With them criss-crossed, it has a ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes
Accepted

What to use to replace rivet on floor jack rear wheel assembly?

Another option is to find a hardened sleeve that goes through the frame and hole with a smaller diameter bolt that is just to hold it in place. See: The orange bit is the sleeve, then as long as ...
Solar Mike's user avatar
  • 34.7k
2 votes

What is the reason for this flimsy scooter engine cover?

What is the purpose of this design? Judging by some other Honda Beat images online, it looks like its primary purpose is to protect the internals from the rear wheel slinging mud. It makes more ...
Zaid's user avatar
  • 39.2k
2 votes

3 rings vs 4 rings pistons: which design is better?

Use the piston from the "newer" design ie most recent - the engineers most likely made changes to reduce or avoid certain issues.
Solar Mike's user avatar
  • 34.7k
1 vote

What is this key hole used for, it is located under my hand brake(See the attached picture)

Shift lock My 02 Nissan had one. Someone rear ended me once, I couldn't get the car into gear from P. Turns out, the lock became engaged, needed to use my car key to unlock
Sam S's user avatar
  • 44
1 vote

Things to Consider While Installing a Radiator

Here's a rather obscure topic to focus on, but still relevant; Clamps. Considering which type of clamps you're going to use is necessary based on what material(s) are present in the cooling system. If ...
NitrusInc's user avatar
  • 773
1 vote

Is anyone working on a battery-powered motorcycle (a real one, not a toy)?

Yes, Zero Motorcycle for one. They had several at the last Harley Davidson show up in Phoenix Arizona. These things are fast! Great acceleration. And very good range. Just do not make the sound of a ...
spicetraders's user avatar
  • 1,533
1 vote

How to not hit the car in front whatever the car?

With today's car designs, you need to "know where your corners are." Blind spots are preventing you from seeing how much space you really do have immediately around your vehicle, so you need to ...
tlhIngan's user avatar
  • 12.2k

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