Over on eBay is a C6 Corvette Z06 whose LS engine was modified to have a flat-plane crank layout. As there are all kinds of rumors about the next generation C8 Corvette that may or may not have a similar setup, I wanted to check this out further!
Traditionally, GM’s small-block engines have utilized a cross-plane crank configuration where the crankshaft rotates 90 degrees between cylinder fires. This keeps the engine running smoothly as there is a constant rotation of the crank because the cylinder is firing during every 90-degree rotation. One of the benefits of V8s with a cross-plane crank is they can provide a large amount of torque beginning at lower RPMs.
A flat-plane crank can be found in many European exotics like Ferrari although Ford used the design in its Mustang Shelby GT350. Flat-plane cranks are designed to rotate 180 degrees between cylinder fires and consequently, they make their torque at higher RPMs. The redline is higher with flat-plane cranks with some going to 9,000 RPMs or higher. The Ford Mustang Shelby GT350 has a redline of 8200 RPMs compared with 7000 RPMs on the standard Mustang GT.
Obviously, there’s more to it than that, but I hope that’ll serve as a quick overview. One of the side-effects of a flat-plane crank is the sound they make when revving at high RPMs and that’s another reason why a Ferrari sounds so good at speed.
So now to jump back to our regularly-scheduled post. Here is a black Corvette Z06 that was fitted with a flat-plane crank and it can rev up to 8250 RPMs. The Z06 was set up to be a track car with LG coil-overs and StopTech brakes. The custom built engine provides 560 hp and 450 lb-ft of torque.
But it’s the sound that we want you to hear. The seller made a video of the Z06 coming and going on a deserted stretch of road and it provides a great soundtrack as to what a Corvette might sound like with a flat-plane crank. We get to hear the car revving and doing some drive-bys at higher-rpms:
We’ve heard from a few that perhaps the Corvette team should go with a flat-plane crank for the C8 Corvette for the higher redline, and one of the interesting patents that GM received recently was a two-stage turbo that would offer more torque at lower RPMs. So perhaps, but I’m not sold on that idea at all.
While I like a good sounding Ferrari as much as the next guy, I think I prefer the big sound that Corvette V8s are known for. What are your thoughts on a flat-plane crank for the Corvette? Let us know in the comments below.
Source:
eBay via RoadandTrack.com
Carbuzz.com
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I vote for the flat crank! Somebody in my part of town has a GT350 that can be heard some nights wailing down the highway – no doubt about what it is. Go for it, Corvette!!
Absolutely go for a flat – plane crank! This sound really adds to the already 100 mile per hour look just sitting at the curb! Truly High Performance!
I vote for a flat plane crank. They sound much better and they they seem to rev quicker.
A flat plane crank sounds great, but can and often have vibrational issues. Check out some posts by Mustang owners who have such a motor on their forums. Most of those vibrations occur around 1,800 RPM, an RPM that many long distance cruise at.
I too like the traditional Corvette ground-pounding sound.
Really, ?? a flat plane crank fires every 180 degrees??? Do the math.. A V8 with 90 degree banks fires every 90 degrees whether cross plane or flat plane crank. All cylinders, of a four cycle engine, have been fired in two revolutions, 720 degrees, of the crank?..
Oops, should be no question mark after the last word…
180 degree headers would have been less expensive.
I love the sound of the flat plane crank!
Karlos, the v-angle of the cylinder banks is irrelevant. You’re correct that all cylinders will have fired after two rotations of the crank, but a V8 with a cross-plane crank is going to have one cylinder firing every quarter (90 degree) rotation of the crank, while a V8 with a flat-plane crank is going to have two cylinders firing every half (180 degree) rotation of the crank. So 8 cylinders divided by one firing at a time every 90 degrees equals 720 degrees ([8/1] * 90 = 270), and 8 cylinders divided by two firing at a time every 180 degrees also equals 720 degrees ([8/2] * 180 = 270).
Essentially, when a V8 uses a flat-plane crank, each cylinder bank is acting like its own inline 4… it’s as if you have two inline 4 engines running simultaneously off the same crank.
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