What is the advantage for having "Quadracam" (4 camshaft) against DOHC or SOHC?

Question

p.s. I have 2003 Kia Carnival (Sedona) V6, 2.5 Liters, 32 valves, "Quadracam" engine

Correction please, engine has 24 Valves (not 32).

Answer 1

Advantages:
Higher revving, better flow, more torque, faster throttle response, possibly better fuel effficiency

Disadvantages:
More prone to high cost repairs, regular maintenance more critical, higher initial cost

Answer 2

I have a 89 toyota corolla sr5, DOHC. It's a 4cylinder, and therefore can only fit two cams. As others have said, one cam for the intake, one for the exhaust. All engines have a minimum of 2 valves per cylinder, one for exhaust and one for intake (gas and air mixture coming in). I'm not sure how it has 32 valves, I can't think of any combination of valves that makes 32 with a V6, because 3 intake and 2 exhaust is 30 valves, 5 valves per cylinder times 6 cylinders is 30 valves. It is more breakable parts, but much better performance, and slightly better fuel economy when compared to a single cam head. Our toyota gets 31 mpg AVERAGE, and it's carbureted. Fuel injection is more economical because the gasoline/air mixture gets shot directly into the cylinders. Carburetion decreases fuel efficiency, it dumps gas vapor into the intake manifold, and some of it clings to the manifold inside, which (if hot enough when the engine return to idle) will ignite, causing the commonly known occurence of a backfire (fuel igniting back into the manifold and out the top of the carb). I have actually seen a ball of flame literally shoot out of my Datsun 510 when I'm working on the carb. I had the hood off and put a small burn in the garage ceiling 12 feet above my head, that's when I decided to pull it off and discover the choke was closing, but not the carb exit point (basically a flap of metal that opens and closes based on throttle input and amount of fuel being used). So to answer your question, you get better performance, with better fuel economy, and more money to spend on engine head repairs. (more parts to remove, more time in labor, more parts to take care of, the list goes on) If you have (or plan to get) this car, Kia's are known to become a POS after 70,000-125,000 miles, so invest in an extended warranty when your intial warranty expires. Make sure it will cover repairs, powertrain, and possibly even maintenance. A warranty, even if it only covers 75%, will save you a lot of money down the road. My opinion, buy a Nissan, Honda, or Toyota. Unless you decide to get a truck, then get a diesel Ford. Diesel may cost more per gallon, but the fuel efficiency is exponentially greater (10city/15highway with a V8 Gas, roughly 20-25city/25-30highway V8 diesel, with a twin turbo).

Answer 3

If you have a "V6" engine, of course you will have at least two cams (DOHC) - on for each cylinder head. The bigest advantage of having two cams for each head - one for the intake valves and one for the exhaust (as your car does) is that the timing of each cam can be adjusted to improve performance. Many cars dynamically adjust the valve timing on each cam as the RPM changes to optimize performance.

Answer 4

ok well first off if its called a carnival, you probably arent in the U.S., so im not sure if the warrantees are the same where you are at. if it is, heres my theory.

they wanted more moving parts to break, for the dealers to make more money off of. im not being a smart@ss here either. just wait til you start getting close to that 100,000 mile warrantee is getting close to being over. things will start breaking at exponential rates. and then you start finding out that kia wont cover this, that, and the other under the warrantee. and then you find out the parts have to be shipped from korea and cost a fortune.

Answer 5

that just means its DOHC on both sides of the engine... it being a V6, the advantage is that you have one cam working the intake and one working the exaust, basically means, you dont have to wait as long to take off when you floor it

Answer 6

the advantage is to the car maker. it will cost you a butt load more to fix it