Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

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Do any car batteries come dry with the electrolyte in a separate container?

Small batteries for Motorcycles and Lawn Tractors are typically sold with the electrolyte in a separate bottle and must be added to the battery at home before installing it. I've never seen a "dry" car battery - they always seem to be full of…
JPhi1618
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Scooter: Motor goes off when accelerating

A friend wants to sell me a scooter for a very cheap price. It is a Chinese model (Qingqi QM125T-10M). Probably a 125cc machine. He tells me that the scooter worked fine and he used it to go to work every day until he lost the key. The scooter was…
Elmue
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What is the efficiency delta between rotary and modern four-stroke engines

Background There is a lot of opinion out there regarding the efficiency delta between wankel rotary engines and four stroke engines of various configurations (forced induction, etc). This delta, whatever it is, seems to be a debate of how much. …
DucatiKiller
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What exactly is a "knurled piston"?

Recently I came across the term "knurled piston" and I don't know what it means. What is a knurled piston? What is the difference between that and a normal piston? Why should you use a knurled piston rather than a regular piston (or not, as the…
Max Goodridge
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Where can A/C condenser be located other than in front of radiator?

1953 F-100 w/ 428 Cobra Jet FE motor. I want to spare my grill and avoid putting the condenser in front of the radiator. Plus, it's already a beast to cool in hot weather, and I live in hell. (It's hot here.) Any other locations for the condenser…
ClayHoon
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How do I get more power out of a rotary engine?

Background I'm looking at a few cars for a track day car that I can abuse. One of the vehicles I'm considering is an older Mazda RX7. The primary reasons being that it has a rotary engine as well as the curb weight, which is very low. I like the…
DucatiKiller
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How do you plan an engine build?

What must be accounted for when building an engine for performance applications? How do you methodically plan a build? Take for instance a stock Small Block Chevy. Budget I understand with an endless budget you will be working with top engine…
Jonathan Musso
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Do straight/short pipes burn out valves?

I have heard that straight/short/custom pipes can burn out valves on an engine. However, with a 4-cylinder Ford Model A engine, I have been told this is not the case because it has such low compression. If there is any validity to…
Jonathan Musso
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My subaru legacy will not boost

I drive a Subaru Legacy Turbocharged GT 2008 model with an EJ20 engine. When I press hard on the acceleration to boost the tachometer upon reaching 4-5 thousand RPM's it starts jerking and there is no acceleration. However, if I accelerate slowly I…
Jamuel
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Engine starter just won't stop starting

I have a 98 Toyota privia and upon starting it the starter just keeps going. This only occurs in drive and neutral. The vehicle also starts in any gear. When I start in park the starter keeps spinning until I shift then it stops: same as neutral.…
Dee
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Computing Wheel Torque From Engine Torque

It seems possible to obtain engine torque and RPM from a truck CAN bus. I'd like to estimate tractive force at the wheels given these two values. How should I go about computing torque at the wheels? Wouldn't I need gear ratio, which doesn't seem…
user1889776
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How is this pavement optimized to suppress water splashing?

In my experience driving through the rain at speeds above 100 km/h results in a cloud of sprayed water behind the car, like so: However, I encounter more and more recently repaired road sections where the pavement is virtually immune to…
Dmitry Grigoryev
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Leaking Fuel Injector Seal

I recently had to remove the fuel injectors and fuel rail to clean out the EGR ports on my Honda Accord. The EGR port was all clogged up with carbon build up. I replaced all the old o-rings, cushion rings and injector seals with new ones. One of…
William
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What exactly is a piston?

Here is a diagram of a disk brake. Notice that there is a piston (in red): This is a piston, most commonly used inside the internal combustion engine: Image 1 Source: http://sjam4uphysics.pbworks.com/w/page/38936885/Regenerative%20Braking Image 2…
Max Goodridge
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1982 Yamaha Virago - Several things are wrong and i'd like to repair myself

Several things have happened in the past couple days and I would like to know what could possibly be wrong before I take it all apart. Engine dies after letting off the throttle while on the road. When I try to accelerate the bike it almost feels…
Josh Hamberlin
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