General Questions

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Apparently this isn't just in race cars where they can adjust the richness of the fuel. Road & Track's test of the Spyker showed that that car can shoot flames out the exhaust too.
 
They need the big carb jets for WOT, if they ran a smaller jet, they wouldn't get a large backfire/flame, and you might risk running to lean, but I dought they would do that, Leaning engine out= DNF.

But I can see where fuel mileage could play into things, say your running a 220 jet, and you put in a 190, you letting less fuel in the engine, maybe getting better mileage. Maybe it depends on the fuel to. I know for a fact that an engine running methanol will almost always backfire. Maybe something to do with air/fuel ratio?
 
You always want to run a little rich. At least rich enough to last till the end of the race.

You can always lean the engine far... faaaar out, just to the point where it's almost knocking... for some extra power... maybe 30-50 hp's worth on these engines... and that will probably gain you a few more laps on the same fuel. But i doubt any cooling system in the world could keep that kind of critter from blowing up in just one lap. A slight gain in fuel economy on the race track (where 1 lap is often 1 liter on regular cars and 4-5 liters on a race engine) isn't worth an expensive blow-up.
 
Philly
Apparently this isn't just in race cars where they can adjust the richness of the fuel. Road & Track's test of the Spyker showed that that car can shoot flames out the exhaust too.
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All cars, from what I recall, shoot flames on downshifts - but most of those aren't long enough to exit the exhaust.

opendriver19a
They need the big carb jets for WOT, if they ran a smaller jet, they wouldn't get a large backfire/flame, and you might risk running to lean, but I dought they would do that, Leaning engine out= DNF.

But I can see where fuel mileage could play into things, say your running a 220 jet, and you put in a 190, you letting less fuel in the engine, maybe getting better mileage. Maybe it depends on the fuel to. I know for a fact that an engine running methanol will almost always backfire. Maybe something to do with air/fuel ratio?
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So, in essence, burning more fuel lets the engine run cooler, hence better? I fail to see the logic, but I guess that's the way it is.

And yeah - the fuel-mileage is why I asked in the first place. Formula 1 teams run different engine-maps during safety-car periods to save some fuel, and IndyCar does that, too.
 
Metar
So, in essence, burning more fuel lets the engine run cooler, hence better? I fail to see the logic, but I guess that's the way it is.
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Running rich is not the same thing as burning more fuel. Adding fuel to the mixture without adding air is the definition of a rich mixture. The throttle adds air, it's up to the carb or injector to add fuel. Adding extra does not burn more fuel. When the air is gone, it's gone.

The extra fuel (wouldn't be any extra if it wasn't running rich) goes out the tailpipe, sometimes ignited on the way. Why the extra fuel? It absorbs heat which could otherwise lead to detonation and engine damage.
 
wfooshee
The extra fuel (wouldn't be any extra if it wasn't running rich) goes out the tailpipe, sometimes ignited on the way. Why the extra fuel? It absorbs heat which could otherwise lead to detonation and engine damage.
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Ah, I see - it's basically a cooling-measure. I guess NASCAR cooling-systems are too restricted for more advanced techniques?
 
Metar
Ah, I see - it's basically a cooling-measure. I guess NASCAR cooling-systems are too restricted for more advanced techniques?
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No, it's not so much that, it's just that with high compression, preignition is a problem because of the compression-generated heat. Extra fuel in that mixture helps avoid detonation.

The radiator and water system carries away combustion heat, the rich fuel charge resists compression heat.
 
is it possible to take out the E3/ Tokyo Game Show security with a Hummer(not a serious question, but i'm thingking of doing a real-life thing like this... either that, or sneak in, and pull the fire alarm. :D )
 
"Not a serious question" and "I'm thinking of doing a real-life thing like this" are contradictions of epic proportions.

Let's fancy for a moment, if you will, that you did indeed drive a Hummer into just the right place to take down the security system. In no time at all, law enforcement, many of whom would be plain clothes, I'm sure, would be on you at which point you'd promptly be placed in custody and if you're incredibly lucky, placed on a list awaiting extradition back to the good ol' US of A.

So to answer your question, yes, a Hummer could disable the security at E3.

Unless it's not on the main floor.

Unless Hummers can now fly.

Which I don't think is an option.

Yet.
 
superberkut
Unless you are Canadian.

What is the highest rpm that a propeller can or is recorded to handle?
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Well, I don't know any specific RPM, since that varies with propeller diameter, but I do know once the tips of the prop exceed the speed of sound propeller efficiency starts to drop. Aircraft and engine designers try to keep props in the transonic region, for best efficiency. This also goes for helicopter rotor blades.
 
What is it with people and putting fartcans on Japanese cars?

Virtually every Japanese car in Christchurch seems to have some sort of bazooka exhaust on it. :|

If it's Japanese, it'll have a fartcan on it. Whether it's a Starlet, a Corolla, a Levin, Skyline, Scooby, Lancer (not necessarily Evos...), it'll have one.

I wouldn't actually mind these exhaust so much, if it wasn't for the fact they're loud enough to make your eardrums bleed...

So why are so many people compelled to stick one on their car? :confused:
 
Bloomin' eck. To follow on from the Drag Racing theme a few pages back, I just did some conversions and a top fuel supercharger can displace 1,800 litres (110,000 ci) of air per minute!
 
Sharky.
What is it with people and putting fartcans on Japanese cars?
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They sound better than the nasal tone of so many others. But, it is strange. I, for one, would rather have the sound of a V8 in such a car. The fact that many racecars once had the exhaust system probably worked for their popularity in earlier years, but then the demand for loud cars took over.
 
superberkut
They sound better than the nasal tone of so many others.
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But the ones here don't sound better than anything, full stop. :indiff:

Here, regardless of the car it's attached to, a fartcan just makes a huge deafening roar with no aural "niceness" to it.
 
You need at least 6 cylinders to have a nice sounding exhaust. Except on a motorcycle. A 4-cylinder car owner should just give up and leave the stock mufflers on, for everybody's sake.
 
wfooshee
You need at least 6 cylinders to have a nice sounding exhaust. Except on a motorcycle. A 4-cylinder car owner should just give up and leave the stock mufflers on, for everybody's sake.
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Sorry, but this says otherwise.
le_baron_rouge_1138359816_1.jpg
 
Important questiion for me:


Does the atmosphere provides us with the same protection from the sun (radiation in general (UV)) as it did before air and atmosphere pollution?
 
just like to ask.., in car terms, what does JDM and OEM mean?? :confused:
 
Sureshot
Bloomin' eck. To follow on from the Drag Racing theme a few pages back, I just did some conversions and a top fuel supercharger can displace 1,800 litres (110,000 ci) of air per minute!
Click to expand...

How fast are they turning, and how big are the cylinders? :eek:

=drifting24/7=
just like to ask.., in car terms, what does JDM and OEM mean?? :confused:
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JDM = Japanese Domestic Market. Meaning, parts and cars available, sometimes exclusively, in the Japanese market.

OEM = Original equipment manufacturer. If I'm not mistaken, that means original parts from the original manufacturer. In car terms: Not-aftermarket.
 
kikie
Does the atmosphere provides us with the same protection from the sun (radiation in general (UV)) as it did before air and atmosphere pollution?
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It is difficult to say, because accurate measurements of UV levels before the discovery of ozone depletion were not made, hence it is difficult to say with any great accuracy just how much more UV is getting through now as opposed to before. Some things we do know are that ozone depletion has slowed and that the regions most affected by thinning of the ozone layer are expected to recover within the next few decades... (possibly).

As far as Europeans are concerned, I would have thought that the effects of ozone depletion would be minimal... not least because ozone depletion mostly tends to occur at the poles, and there is little evidence to show that regions such as Europe have experienced much (let alone a significant) increase in UV radiation exposure...
 
A couple friends and I just got jumped tonight and I'm thinking I came out with a broken nose. Anybody know the best way to treat it? I might head to the ER or something tomorrow...

I'm not expecting to get my phone back. Should insurance cover the fender that one of the guys kicked in?
 
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