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car overhead cam purpose Related Articles

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car overhead cam purpose Q&A Review

What is the biggest car in the world?

Question: “What was the biggest car ever made?” Let me show you Ettore Bugatti’s French Type 41 Bugatti Royale. This car had a wheelbase of 169 inches (429 cm) and a length of 252 inches (641 cm). In comparison the truck-like Cadillac Escalade is a small car having a wheelbase of ONLY 116 inches (295 cm) and a length ONLY 204 inches (518 cm) long. The Bugatti Royale is FOUR FEET (actually 123 cm) LONGER and has a wheelbase which is MORE THAN FOUR FEET (actually 134 cm) LONGER than an Escalade! This car was impressive! The engine for the Royale, a beautifully machined engine turned straight-8, displaced more than 12.7 liters or 779 cubic inches, more than twice the size of the Cadillac Escalade’s V-8. ONE CYLINDER of the Bugatti Royale’s straight-8 had a displacement bigger than the ENTIRE ENGINE in a BMW Mini, Honda Civic, or Toyota Yaris! Moreover, the Royale had an overhead cam design and three-valves per cylinder and was based upon the design of a French aircraft engine. Bugatti engines eliminated the problem of head gasket failure by simply eliminating the head gasket. The block and cylinder head of the big straight-8 were cast in one piece. This, however, created its own problems. In the 1930’s the valves and valve seats of an engine had to be ground and lapped on a yearly basis. As the cylinder head of the Royale, or any Bugatti for that matter, could not be removed, that required the engine to be removed from the chassis every time the valves were ground. Bugatti originally intended to build 25 Royales and sell them to European Royalty. However, the economic depression of the 1930’s intervened, and only seven Royales were ever built, three were sold, and one was destroyed. None were in fact ever sold to royals. And Ettore Bugatti notably REFUSED to sell one of the cars to King Zog of Albania because “the man’s table manners are beyond belief!”. God I like the French! Ettore Bugatti would NOT have sold a car to Donald Trump! Ettore Bugatti had integrity and style. An engine extremely similar to that of the Bugatti Royale, again a 24-valve, overhead cam, 12.7 liter straight-8 was used by the Bugatti Company to power a series of gasoline powered French railcars. Two or four of these engines were used in each of these for this purpose. Interestingly, Bugatti is best known for extremely fast, light weight, and very roadable sports cars such as the Type 35 or the lovely Type 57. And the Bugatti Royale, despite its size and weight, was designed to be driven fast and was said to have handled like a sports car. The Bugatti Royale is undoubtedly the biggest fine car ever built. P.S. It should be noted that the current car using the Bugatti nameplate is a Volkswagen and has no relationship to the legendary Bugatti other than having purchased the name.

Why are V8’s from a company like Lexus, designed so differently than V8’s from a company like GM?

Both manufacturer’s V8s are legacy designs. GM’s legacy is the pushrod V8 that they designed in the 1950s. It’s a solid and refined design that is very compact and reasonably efficient, and it has changed very gradually over time, saving GM money and development time. The last major change was the addition of direct injection for the Generation IV V8s in the 2010s. GM’s V8 is small, to fit in many different designs and fit for many different purposes. It’s a ubiquitous engine in their lineup, found in a wide variety of configurations. Toyota’s V8 comes from the 1980s, a time of massive prosperity in Japan. As a result, they designed a V8 for their luxury car with all of the features to be expected from a Japanese engine of the 1980s: variable valve timing, dual overhead cams operating 4 valves per cylinder, electronic fuel injection. The number of changes needed to bring this engine into the modern era are very small and cheap to implement, saving Toyota money and development time. This engine goes mostly into large cars and trucks, meaning that the packaging requirements are similar across all uses. So the differences in engine design date back to when and where they were designed.

What is the difference between m-falcon and m-hawk engine technologies by Mahindra?

Hi, mHawk engine mHawk engine is current gen engine from Mahindra which is the the downsized version of m2dicr Its a 2.2 liter (2200cc ) engine delivering class performance of 140bhp @ 3750 rpm and 330 Nm @ 2800 Rpm. The turbo is a VGT turbo with overhead intercooler ( the intercooler is placed in the engine head to avoid pumping looses) The engine uses dual overhead cams with 4 valves per cylinder ,and the engine is also less in weight. mflacon mFalcon petrol engine seems to have a bright future in India. Diesel powered cars are being banned and petrol engines would definitely take over for maintaining the pace of the society. Mahindra has planned a petrol version for every car by year 2020, directly pointing at the development of bigger mFalcon 1.6 L and 2.0 L petrol engines for the desired purpose. The current mFalcon engine is named G80 and it comes with a 3-cylinder configuration. The power production is 82 BHP @ 5,500 rpm and 114 NM @ 3,500 rpm. It is mated to a 5-speed gearbox, delivering great city performance and making it a decent highway cruiser for sure. The engine is lightweight, made up of aluminum and gets a plastic intake manifold. It uses low friction seals and returns a great mileage figure. There is no much difference in persona for both engines as they are best in their fuel type. Thank you. Take care

What is the largest vehicle in the world?

Original Question: “What was the biggest car ever made?” Let me show you Ettore Bugatti’s French Type 41 Bugatti Royale. This car had a wheelbase of 169 inches and a length of 252 inches. In comparison the truck-like Cadillac Escalade is a small car having a wheelbase of ONLY 116 inches and a length ONLY 204 inches long. The Bugatti Royale is FOUR FEET LONGER and has a wheelbase which is MORE THAN FOUR FEET LONGER than an Escalade! This car was impressive! The engine for the Royale, a beautifully machined engine turned straight-8, displaced more than 12.7 liters or 779 cubic inches, more than twice the size of the Cadillac Escalade’s V-8. ONE CYLINDER of the Bugatti Royale’s straight-8 had a displacement bigger than the ENTIRE ENGINE in a BMW Mini, Honda Civic, or Toyota Yaris! Moreover, the Royale had an overhead cam design and three-valves per cylinder and was based upon the design of a French aircraft engine. Bugatti engines eliminated the problem of head gasket failure by simply eliminating the head gasket. The block and cylinder head of the big straight-8 were cast in one piece. This, however, created its own problems. In the 1930’s the valves and valve seats of an engine had to be ground and lapped on a yearly basis. As the cylinder head of the Royale, or any Bugatti for that matter, could not be removed, that required the engine to be removed from the chassis every time the valves were ground. Bugatti originally intended to build 25 Royales and sell them to European Royalty. However, the economic depression of the 1930’s intervened, and only seven Royales were ever built, three were sold, and one was destroyed. None were in fact ever sold to royals. And Ettore Bugatti notably REFUSED to sell one of the cars to King Zog of Albania because “the man’s table manners are beyond belief!”. God I like the French! Ettore Bugatti would NOT have sold a car to Donald Trump! Ettore Bugatti had integrity and style. An engine extremely similar to that of the Bugatti Royale, again a 24-valve, overhead cam, 12.7 liter straight-8 was used by the Bugatti Company to power a series of gasoline powered French railcars. Two or four of these engines were used in each of these for this purpose. Interestingly, Bugatti is best known for extremely fast, light weight, and very roadable sports cars such as the Type 35 or the lovely Type 57. And the Bugatti Royale, despite its size and weight, was designed to be driven fast and was said to have handled like a sports car. The Bugatti Royale is undoubtedly the biggest fine car ever built. P.S. It should be noted that the current car using the Bugatti nameplate is a Volkswagen and has no relationship to the legendary Bugatti other than having purchased the name.

Why do 8 cylinder engines top out at a lower rpm than 4 cylinder engines?

Overhead cams help with rpm. Most v8s use rods that are on the crank shaft. The common throw a rod comes from this type of engine. Also in the factpr of rpm is the piston speed. The longer the stroke the faster the piston has to travel. Generally a V8 will have a longer stroke than a 4 cylinder. I could be wrong but i think the bore size and stroke lenght = liter. So the larger the piston the heavier it is. So bore size might play into the equation also. Just for thinking purposes…. A 2L 4 cylinder could have the same bore and stroke as a 4L V8. Tbh i have not seen many V8 that small. With the problem of not overhead cam it would be smaller suggested to have a higher rpm. There are other factors in the rpm. How stiff valve springs and the time its givin to get closed. This is ment only to give a rough means for understanding. Here is an example of a small bore small stroke V8. Its only 3L so very very small block and it has an over head cam. Car and Driver This Atom’s heart is a 3.0-liter, DOHC V-8 engine built by Hartley Enterprises in Milwaukee, Wisconsin. Race-derived components include dry-sump lubrication, a flat-plane crankshaft, forged pistons, and eight individual throttle bodies. In road tune, the engine produces 475 hp at 10,500 rpm and 268 lb-ft of torque at 7750 rpm; in race tune, it’s capable of 500 hp at 10,600 rpm and 284 lb-ft at 7750 rpm.

Given we exist because of multiple, purely random, mass extinctions, how could anyone think we humans were the/a goal of evolution?

Most people's attitude about evolution is, "Don't know. Don't care." They're fine with whatever understanding they've absorbed because evolution -- and probably other science topics -- just doesn't interest them. Based on a casual understanding of evolution it's easy to believe that evolution has a direction and a purpose. To evolve is to "develop gradually, especially from a simple to a more complex form." The evolution of life forms looks exactly like the "evolution" of the car from barely more advanced beyond a horse buggy: to this: The Tesla Model S with ,autopilot,. (Which used to be called a horse ;-) ) The auto industry has suffered mass extinctions too. Remember Oldsmobile? The 3rd largest seller in 1970s. It died out in 2004. The Duesenberg? In the 1930s they produced a 5000 pound car with "a self-lubricating chassis, twin-overhead-cam four-valve-per-cylinder inline eight-cylinder engines with a top speed of 110 miles per hour." It went extinct in 1937. I think it takes a lot of determination to work to understand how evolution ,doesn't, have a purpose, that it ,isn't, driven to perfect the various models. The difficulty is similar to wrapping one's head around the idea that the Earth revolves around the sun. It's ,still, easier to understand the sun going around the Earth than it is to understand the truth.

Is anybody taking stock V12 engines from cheap, dated, luxury sedans and fitting them into light, mid-engined kit car or rat rod configurations?

To look at this question from a different angle, consider why the Chevy LS is such a common object of engine swaps. Given its displacement and ability to make power, it’s very small and very light. It also has a ton of aftermarket support. Given its size, it’s easy to fit into or on a given chassis. The reciprocal of this is a V12 (pretty much any V12). By their very nature, V12s are long. Further, essentially all of them are at least overhead cam if not double overhead cam. This means they’re wide due to the head design. They’re also relatively rare and varied, which means there’s not a lot of aftermarket support. This means things like induction systems will be difficult to source and set up. Finally, the cars they come from are often preserved due to the nature of them being expensive in the first place, so the engines are freed up for other purposes. I’ve driven a 2004 Mercedes SL600 with a twin turbo V12. It was very impressive, but a Chevy LS is in most ways, a better engine for the purpose you’re talking about. To directly answer the question, I’m sure someone has used an old Jag, Mercedes or BMW V12 (are there any others that might qualify?) in such a project, but I’m sure they’re exceedingly rare.

Why is ethanol blended with petroleum?

It's the most natural way to enable gasoline to function properly in a high compression engine. Ethanol has a very high octane rating. It has less BTUs than gasoline but it can run on much higher compression ratios. Before ww2 cars typically had 5 to 1 and 6 to 1 compression ratios. If 1x amount of power is made in a 5 to 1 engine… then almost 2x amount of power can come from a 10 to 1 engine. Aircraft engines in WW2 had to produce as much power per pound as was possible. Pressurized anti-freeze radiators… 4 valves per cylinder… overhead cams… supercharging coupled with piggybacked turbo charging…. and… as such… much higher compression ratios were adopted. It worked. Over 2,000hp could be produced from engines previouslybonly ablrbto oroduce 1,00–1,200 hp. But to enable the super amd turbo chargers to work…the gasoline had to have very high octane strings. Much of this came from the NACA labs (precursor of NASA) and the "Hyper Engine" project of The late 1930's. For any gearhead: the "Hyper Engine" project is an oft ignored yet vital part of American ingenuity. And scientific achievement.

Are Overhead valve engines inferior to overhead cam engines since most modern cars use overhead cams?

The camshaft is incorporated into an engine for one purpose only - that is to open the intake and exhaust valves. Early side valve engines had the camshaft in the proper place - directly under the valves giving direct operation without any linkages or pushrods etc. Very straightforward. When overhead valve cylinder heads were produced the camshaft was left in the same position as in the side-valve engine, requiring an overly-complicated and sometimes unreliable pushrod and rocker system to open and close the valves. So in that respect - yes they are inferior. And they add reciprocating mass to the valvetrain, requiring stronger valve springs and limiting the rpm capability of the entire valve train. That is why most modern engines use overhead cams, except for large capacity, low-revving engines such as those used in trucks. And one or two car engines.

Is the Royal Enfield Himalayan 650 coming soon?

I am not sure about the Himalayan 650 cc . Let me explain , though some or many may disagree . The existing Himalayan is underpowered . That is one major complaint . But then few have complaints on its off roading capabilities . A bigger engine like the RE Interceptor’s would increase the vehicle weight. One major requirement of off roading is minimum vehicle weight especially when riding damp, sandy or mountainous terrain. Second the purpose is increasing the payload, without increasing the weight or improving the power to weight ratio. Yes, a 650 cc engine improves the power to weight ratio significantly as opposed to the current 411 cc . However the problem is that it adds weight to the motorcycle. If ithe bike is purpose built, the vehicle weight needs to be low without compromise on integrity . A Triumph tiger with a three cylinder engine dual overhead cam operating 12 engine valves ,weighs just 198 kgs. The Himalayan weighs 195kg with a single cylinder single overhead camshaft engine. The power/torque of Tiger is 95 brake horsepower and 79 newton metres . The difference shows up in the power to weight ratio as well, 0.5 brake horsepower per kg for the Tiger as against a measly 0.13 bhp per kg of the RE Himalayan ! Clearly the Himalayan has substantial scope for improvement. So what can be expected is improved performance from the engine with some or slight change in displacement . Perhaps a twin cylinder Dual overhead camshaft engine with four valves per cylinder? A lighter frame with lower saddle height would be a significant improvement . The purpose is making the biking experience inclusive rather than exclusive . Inclusion would allow shorter riders and women to take to off road biking . All Indians are not tall are they ? So can the power to weight ratio be improve in Himalayan ? I believe there is huge scope for improvement! Watch the video please ! Finally I ride a 500 cc RE desert storm and am short. By just removing the saddle springs alone brought the saddle height down to 775 mm. Removed the excesses , such as the rear seat solid stays and the ancient saree guard . RE is sexist and hasn’t woken up to the fact that modern women prefer to be on the saddle rather than the pillion . (For stubborn saree fans, there are scooters or cars!). Certainly these are not insurmountable engineering challenges missed by Siddhart Lal. So expect the new Himalayan to be lighter more powerful ! I am anxiously waiting to ride one before I hang up my riding boots !

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