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This P-51 Mustang replica flies with a Honda Odyssey engine

The legendary WWII P-51 Mustang fighter ranks right up there with hot dogs, baseball, and apple pie. So sought after is the original Mustang that one of the 200 or so airworthy P-51s left will run you at least $1.5 million. That's why there's a thriving replica market with three-quarter-scale aircraft like this Titan T-51D Mustang. It looks every bit the part until you crack open the cowling and find not a howling Rolls-Royce Merlin V12, but the V6 from the Honda Odyssey minivan. To be precise, the Titan T-51 uses Honda's J35A6 60-degree SOHC V6. It's one version of the ubiquitous J-series engine, found in the Odyssey minivan as well as the Honda Pilot. Other variations of the Ohio-built powerplant pull duty in the Accord and several Acura models. But why a Honda V6? Titan Aircraft president John Williams says the company began production of the T-51 with a Rotax 912F four-cylinder boxer engine, but its 100-horsepower output wasn't cutting it for customers. They wanted "more power and more noise." So the search began for a lightweight, easily-packaged V6, leading first to a Suzuki 2.5-liter with 160 hp. "Our guys still wanted more power, so the next choice was either going to be a Chevy V8 or a Honda V6. The Honda is a little bit lighter and from a V6 standpoint, it's a brute. In the Honda Pilot or the Odyssey, it's rated from 240 to 250 horsepower," Williams explains. Converting the V6 to an airworthy powerplant requires minor modifications, such as swapping the stock engine control unit (ECU) for an aftermarket one. Car-specific parameters for things like anti-knock sensing and rev limiters simply don't work well in the air. "You don't want your timing retarded when you're trying to clear a tree," Williams chuckles. With a hotter Acura camshaft and exhaust modifications, the naturally aspirated Honda engine makes about 300 hp in the T-51D, Williams says. The V6 mates to a custom gearbox designed to yield a 2-to-1 reduction for the propeller. Rather than the original Mustang's crankcase oil, the Titan's nosecase uses automotive gear oil. And while the engine can obviously use regular unleaded from any gas station, it runs well on the 100-octane low-lead aviation fuel commonly found at airports. The T-51 is a kit airplane that buyers can build themselves for less than $100,000. And like most kit manufacturers, Titan offers a builder-assistance program to help with assembly.

Submit your questions for Autoblog Podcast #317 LIVE!

We record Autoblog Podcast #317 tonight, and you can drop us your questions and comments regarding the rest of the week's news via our Q&A module below. Subscribe to the Autoblog Podcast in iTunes if you haven't already done so, and if you want to take it all in live, tune in to our UStream (audio only) channel at 10:00 PM Eastern tonight.
Discussion Topics for Autoblog Podcast Episode #317
Mitsubishi Mirage

2019 Volkswagen Jetta GLI vs. sport compact sedans: How they compare on paper

Hot hatchbacks may be stealing the headlines, but they're not the only way to get cheap speed. There are actually a number of small sporty sedans on the market, too, in case you want that more formal roofline. The recently revealed 2019 Volkswagen Jetta GLI highlighted these vehicles, so we figured we'd take a look at the specifications and see how they compare to each other. Our contenders are the aforementioned VW, along with the 2019 Honda Civic Si, 2019 Subaru WRX and 2019 Hyundai Elantra Sport. All four start under $30,000 and offer more than 200 horsepower. And of course, they all have trunks. In our comparison, we'll look at each car's powertrain comparing horsepower and torque. We'll also look at practicalities such as interior space, fuel economy and pricing. You can see the raw numbers in the chart below, followed by additional analysis and links to reviews. If you'd like to compare any of these cars with a different group, be sure to check out our car comparison tool. Engines and drivetrains Performance, and particularly power, is likely a priority for a sporty sedan buyer, and there's a clear leader: the Subaru WRX. At 268 horsepower, it's 40 ponies ahead of the next most potent car, the 228-horsepower Jetta GLI. It also ties the GLI for torque at 258 pound-feet. Both cars also support the old adage that "there's no replacement for displacement," since each have 2.0-liter engines while the Hyundai has a 1.6-liter unit and the Honda engine only displaces 1.5 liters. The Hyundai and Honda are nearly tied for power and torque, too, at roughly 200 horsepower and 195 pound-feet of torque. Another bonus for the Subaru is its standard all-wheel-drive system, which is handy for power delivery, lateral grip and for inclement weather. While the Jetta GLI and Civic Si are front-drive only, they do feature mechanical limited-slip differentials to enhance traction under power. The Elantra Sport makes do with electronic aids and an open differential. We're pleased that all four of these cars offer manual transmissions, too. But if you do want or need an automatic transmission, the VW, Subaru and Hyundai have you covered. The VW and Hyundai rely on seven-speed dual-clutch transmissions, and the Subaru uses a CVT with eight preset ratios for manual mode shifting. The Civic Si, though, is manual only (and it's an excellent manual at that).