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You hear that that the DOHC is more efficient, and it is, but not because of the cams. It is more efficient as it has hemispherical combustion chambers.
No, a DOHC engine has pentroof combustion chambers. Hemi's are old school 2-valve technology.
A big heavy V8 with 4 times more cams, double the valves and two turbos has a car running in the 11s, while the tiny, lightweight LS6 with no forced induction from 2002 has the Corvette Z06 at the time doing the same. Glad BMW finally caught up.
But in all seriousness GM already has a lighter, smaller engine already making way more power, and probably costing less as well.
One key difference? BMW sells all of its cars worldwide. Know how cars are taxed in many worldwide jurisdictions? Displacement. Corvette isn't sold worldwide in appreciable enough numbers to care about that. BMW has to make more from less if it wants to sell everywhere it does.
One key difference? BMW sells all of its cars worldwide. Know how cars are taxed in many worldwide jurisdictions? Displacement. Corvette isn't sold worldwide in appreciable enough numbers to care about that. BMW has to make more from less if it wants to sell everywhere it does.
Physical size isn't always a main consideration.
You bring up a great point, and one that has a lot of bering on why I think the base model will likely have the smaller displacement dohc.
According to the codes inside the leaked key fob, the MEC may make its way into markets around the world that the Corvette hasn’t competed in before. Is a right hand drive in the works.? Would Europeans buy it with the Lt1? I don’t know, but I think it’s more likely to compete on the world stage with the dohc.
You may not care about that, but I’m sure GM does.
Only detail I have been able to find is Wikipedia so take this with a grain of salt.
You are misunderstanding the chart.
The HP and Torque numbers mean those numbers are reached at the RPM given in the chart.
It doesn't have anything to do with Engine redline in the slightest.
You bring up a great point, and one that has a lot of bering on why I think the base model will likely have the smaller displacement dohc.
According to the codes inside the leaked key fob, the MEC may make its way into markets around the world that the Corvette hasn’t competed in before. Is a right hand drive in the works.? Would Europeans buy it with the Lt1? I don’t know, but I think it’s more likely to compete on the world stage with the dohc.
You may not care about that, but I’m sure GM does.
Wasn't that the plan with the Cadillac ATS, CTS & CT6? Maybe GM has learned its lesson - no one outside of the good old USA gives a sh*t about GM cars, and that isn't going to change, so making a car for the world markets and pricing it at that level (if GM had gone after Infinity & Lexus with its cars and Acura, Infinity with its smaller SUV's, it might have had a shot at building its Cadillac brand, but in many ways GM management still thinks it is 1975 and GM is the market), such that the people in the USA won't buy it is a fools errand.
One key difference? BMW sells all of its cars worldwide. Know how cars are taxed in many worldwide jurisdictions? Displacement. Corvette isn't sold worldwide in appreciable enough numbers to care about that. BMW has to make more from less if it wants to sell everywhere it does.
Physical size isn't always a main consideration.
Most first world countries have gotten away from displacement tax, probably realizing its idiotic considering a 5.7L Corvette gets better gas mileage than a 2L S2000.
Physical size is a concern and should be for a sports car aimed at handling - you can mount the engine lower and closer to the center of the chassis for ideal weight balance and center of gravity.
If anything GM should be looking at a camless drivetrain with electronically controlled valves at this point.
Most first world countries have gotten away from displacement tax, probably realizing its idiotic considering a 5.7L Corvette gets better gas mileage than a 2L S2000.
Physical size is a concern and should be for a sports car aimed at handling - you can mount the engine lower and closer to the center of the chassis for ideal weight balance and center of gravity.
If anything GM should be looking at a camless drivetrain with electronically controlled valves at this point.
You can't do that. F1 cars have cams. The valve springs are replaced with air.
The newest version of that 4.4l bmw engine you show makes around 617hp. And it’s rival AMG 4.0l biturbo hot v makes over 600hp ,weighs about 460lbs, and the grocery getter they stuff it in smokes the Z06.
Whats your point again?
How much do they weigh fully assembled...? LT4 fully assembled is 520lbs and makes 650hp/650ft/lbs. Show me how much that 4.4l 617hp engine weighs fully assembled.
Don't understand the desire to have a lower performance (weight, size, reliability, power density, etc) engine, so that the engine can seem 'advanced'. What a strange priority!
For a lot of companies the DOHC engine is used for image/status. The engine used needs to meet the need of the car. To me the LT does that in spades for the Vette.
You hear that that the DOHC is more efficient, and it is, but not because of the cams. It is more efficient as it has hemispherical combustion chambers. What the multiple cams do is allow the engine to rev. It gets rid of the lifters, pushrods, and rockers allowing for better valve control and higher revs.
The Cadillac DOHC engine is confusing. The specs show it reving to only 5000 - 5500 rpm. To take advantage of its efficienties it needs to rev out to 8000 rpms at least. If you are restricting it to 5500 then you may as well have on OHV.
But with the higher revs you are basicly having to ring its neck to get it going. You will also have higher maintenance and upkeep costs not to mention higher repair costs.
For the way 90% of Corvette owners use their car, the LT is more than sufficient. For the boy racers, they can wait a couple more years to get their image engine.
The DOHC supercharged engine in my Mercedes sedan has a 5,800 RPM redline.
The OHV NA engine in my Z06 has a 7,000 RPM redline.
It's fun shifting at 7,000 RPM into 5th gear at 160 MPH in my OHV Z06. I can't do that in my Mercedes.
Wasn't that the plan with the Cadillac ATS, CTS & CT6? Maybe GM has learned its lesson - no one outside of the good old USA gives a sh*t about GM cars, and that isn't going to change, so making a car for the world markets and pricing it at that level (if GM had gone after Infinity & Lexus with its cars and Acura, Infinity with its smaller SUV's, it might have had a shot at building its Cadillac brand, but in many ways GM management still thinks it is 1975 and GM is the market), such that the people in the USA won't buy it is a fools errand.
Last year(2017), GM sold more vehicles in China than they did in the good old USA. The Buick Lacrosse and the Cadillac CT6 is history in the good old USA, but both will continue to solder on in GM's China manufacturing facility.
Ford and GM dropping their sedans in the USA is a result of not being competitive in that market in the USA. Other manufacturers will keep building/importing sedans for the USA market. SUV's are indeed the hot ticket in the USA, but there is still a large market for sedans.
You are misunderstanding the chart.
The HP and Torque numbers mean those numbers are reached at the RPM given in the chart.
It doesn't have anything to do with Engine redline in the slightest.
Correct, but that is the peak power, just wasting your time going ant further.
Last year(2017), GM sold more vehicles in China than they did in the good old USA. The Buick Lacrosse and the Cadillac CT6 is history in the good old USA, but both will continue to solder on in GM's China manufacturing facility.
Ford and GM dropping their sedans in the USA is a result of not being competitive in that market in the USA. Other manufacturers will keep building/importing sedans for the USA market. SUV's are indeed the hot ticket in the USA, but there is still a large market for sedans.
And the cycle repeats itself w the domestic OEMs abandoning market segments because of profitability until there reaches a point where the supply meets demand and so imports end up making the money.
Seen this movie before.
Last year(2017), GM sold more vehicles in China than they did in the good old USA. The Buick Lacrosse and the Cadillac CT6 is history in the good old USA, but both will continue to solder on in GM's China manufacturing facility.
Ford and GM dropping their sedans in the USA is a result of not being competitive in that market in the USA. Other manufacturers will keep building/importing sedans for the USA market. SUV's are indeed the hot ticket in the USA, but there is still a large market for sedans.
This is partially true, but misleading. GM's presence in China consists of 10 joint ventures w/ Chinese entities, and 2 wholly foreign-owned subsidiaries. The #1 "GM" selling car in China is the "Baojun" of which GM owns only 44%.
The vehicles selling very well in China are not the models it sells in the US. The cars more similar to US models are built by a 50/50 GM-SAIC consortium, and they are not selling in large numbers. Moreover, GM financial agreements with these Chinese entities are so generous, the margins are so thin, they don't contribute all that much to the corporate bottom line.
12-29-2018, 09:06 PM
