GM's most effecient motor

[batmang]

lol, womp!

 

[Super Matty P]

lol, moneyshot your eye!

 

[jred321]

are we talking strictly hp/liter here or is there like a correction factor due to FI? i wouldn't think it fair to compare say a 200hp 1.8l honda motor to a 276hp 2.0l evo motor. for NA motors gm sucks with their current production stuff. if we get into FI, the saab 9-2x (aka saabaru) is probably one of their top cars, making 227hp from 2.0L, or sticking with traditional american GM the supercharged ecotec at 2.2 liters making 205hp. of course this is all from my 10 mins of research

 

[Hughes412]

What I got out of the first post of this thread was what GM engine was the most efficient!
I would have to say the 350. Thats why its been around for so many years.
Although the 84 Vett only had 250 hp it had 300+ torque witch put it in the 13s. That same 350 a few
Yrs before made over 300 on regular gas and still got 20+ mpg, depending on what gears you ran and how you drove. It also is good for well over 500hp if you FI. It is the platform for all the Vortec engines now.
It is the most versatile engine that I know of, but I am a chevy guy so I might be a little biased.

 

[Mach 3.5 Turbo]

^hp per liter should be calculated irregardless of how it got that way. FI is still part of the engine, so I think it's fair game. From my boredom in class here, it looks like the saab 9-5 and the pontiac vibe GT both make about 100 hp/liter. Can anyone beat those figures in a GM car? I think Saab is mostly owned by GM, not entirely sure, but I know Pontiac is 100% oldschool GM.

 

[Stealth5]

man, when you divide out the figures, gm v6's seem to be the WORST MOTORS EVER

 

[blynzoo]

holden isn't european i don't think holden is big on hp/liter either, most of their cars are big and made to make every day power, not peak power. aussies like v8's. a pushrod v8 isn't going to win any hp/liter contests

Eh. To me australia is just Europe South. Or Europe's Leftovers.
KIDDING!

Yeah aussies got some monsters over there (they gave us the new GTO, sort of). gotta love 'em.

 

[jred321]

What I got out of the first post of this thread was what GM engine was the most efficient!
I would have to say the 350. Thats why its been around for so many years.
Although the 84 Vett only had 250 hp it had 300+ torque witch put it in the 13s. That same 350 a few
Yrs before made over 300 on regular gas and still got 20+ mpg, depending on what gears you ran and how you drove. It also is good for well over 500hp if you FI. It is the platform for all the Vortec engines now.
It is the most versatile engine that I know of, but I am a chevy guy so I might be a little biased.

GM > chevrolet/pontiac/gmc

250hp out of a 5.7 liter motor isn't going to win any contests of hp/liter, there are plenty of motors that double that efficiency. modding aftermarket doesn't count either, but even at 500hp out of a 5.7 liter motor you're not going to win anything. we aren't talking about versatility, strictly how much horsepower an engine makes for it's given size.

 

[jred321]

^hp per liter should be calculated irregardless of how it got that way. FI is still part of the engine, so I think it's fair game. From my boredom in class here, it looks like the saab 9-5 and the pontiac vibe GT both make about 100 hp/liter. Can anyone beat those figures in a GM car? I think Saab is mostly owned by GM, not entirely sure, but I know Pontiac is 100% oldschool GM.

saab is listed on gm.com, so i'd say it counts until we hear otherwise. the 9-2x is 227hp/2.0 liters, or 113.5hp/liter

 

[Mach 3.5 Turbo]

What I got out of the first post of this thread was what GM engine was the most efficient!
I would have to say the 350. Thats why its been around for so many years.
Although the 84 Vett only had 250 hp it had 300+ torque witch put it in the 13s. That same 350 a few
Yrs before made over 300 on regular gas and still got 20+ mpg, depending on what gears you ran and how you drove. It also is good for well over 500hp if you FI. It is the platform for all the Vortec engines now.
It is the most versatile engine that I know of, but I am a chevy guy so I might be a little biased.

I'm a Chevy guy too, and I even run a 350 in my truck, but I can vouch for the bad efficiency of a 350. The 350 is 350 cubic inches, or about 5.7 liters. In reality, most of them only make about 200 or at most 300 horsepower. That's a 50 hp/liter efficiency at the most. I'm not sure what the highest HP 350 ever made was, but if you're talking production numbers the 350 kinda sucks. Unless you have 570 horsepower or more in a factory application, you can't beat a pontiac vibe GT. It is a fantastic engine, however, if you don't mind paying out the ass for gas. It's a square bore oldschool V8, and you can damn near get parts for them at Wal-Mart. There's almost nothing you can't do to one of these aftermarket, and it's damn hard to break one. They leak oil on the factory floor when they put them together, and they sound like they're running on 5 cylinders due to the weird firing order (as compared to say a 5.0 Liter Ford, nice sounding engine). I personnaly agree that's it's one of the best engines ever made, but I'm a hillbilly and I like a lumpy old V8 that can double as a wrecking ball when it's finally wore out.

 

[jred321]

man, when you divide out the figures, gm v6's seem to be the WORST MOTORS EVER

agreed, and if you're sticking strictly to peak horsepower from the factory every motor they make sucks pretty much

 

[Super Matty P]

the Vibe doesn't count...thats a toyota engine..

 

[jred321]

does the vibe gt use the toyota matrix motor?

edit: i was beaten to it

 

[RyanJayG]

the original z-28's were about 80 hp/liter... not bad for 1967

btw, thats actual HP(~400), not the rated 290 hp for the 5.0L

 

[Hughes412]

GM > chevrolet/pontiac/gmc

250hp out of a 5.7 liter motor isn't going to win any contests of hp/liter, there are plenty of motors that double that efficiency. modding aftermarket doesn't count either, but even at 500hp out of a 5.7 liter motor you're not going to win anything. we aren't talking about versatility, strictly how much horsepower an engine makes for it's given size.

I thought I would put the 84 350 (5.7) down just to show that with this engine anything is possible. He asked the most efficient GM engine so I took it to be over all not just gas mileage. You could look at the ZR1 and the ZO6, The owned the road when compare dollar for dollar and performance and reliability. Yes there are cars at both times that could out perform but that came at a BIG price. Now I am no expert but I have had Dodge, Toyotas, Nissans, Fords, and Chevys, and the only one that could that my abuse was the Chevy. I had a 78, and a 97 Z28 and both ran 12s on regular gas and got great gas mileage (for the HP) until I finally broke them.
If the US didnt have all the smog restrictions on our cars there wouldnt be an import market here. Yes the domestic automakers are behind the times when it comes to 4 and 6 cylinders but thats because we got a late start on them. We are however making SOME progress. The SRT4 and 6 are good examples of that, and yes I know that came with help from the import side. Bang for your buck is also what makes them efficient! Now over all, who makes the best reliable engine, I would have to say Honda. But he did ask GM.

 

[jred321]

im writing a paper for school comparing american cars to imports and i was wondering if anyone knows which GM motor is the most efficient in terms of horsepower per liter. i think its the 4cyl they put in the cobalt but im combing all their sites to find it

that means when you divide horsepower by the size of the motor, which one wins? he wasn't talking about gas mileage, overall potential, reliability, price to get that power or anything other than strictly horsepower made/size of motor.

i don't doubt the potential of a big v8, gm or otherwise, but given most of them make only in the 200's for horsepower in stock form and they have huge displacement, they're not going to win. the 350 you're talking about would need over 570hp in stock form to win this contest, since 570hp/5.7liters=100hp/liter, which isn't even that good, but is at least respectable. to win a hp/liter contest you're most likely going to need a small motor making good power top end power at the sacrifice of down low power, as there aren't many cars out making the over 300 peak hp that would be necessary for any motor over 3.0liters.

 

[TXMazdaSpeeder]

more than likely the 2.2L ecotec, its a pretty damn nice motor.




definately not the LB9 305 TPI, best boat anchor chevy ever made