“There are no engine isolation mounts to help dampen the impact in a race boat application like ours. “The serpentine belts needed raised, edge-type pulleys to keep from kicking the belts in the rough water,” Weismann adds. The offshore racing environment puts the entire drivetrain through stresses never experienced on dry land, meaning that even minor details can become major issues. The engines are installed flywheel-to-flywheel, with offset gearboxes transferring power to twin driveshafts, then to the six speed transmissions and drive units. We control the engine during the shift by either raising the revs for a down shift, or dropping the revs for an upshift.” We’re able to shift the transmissions with our own TCU and without a clutch. It was OK, but when we shifted, we needed throttle-by-wire to control the engine better during those shifts, so we went with an MSD Atomic LS EFI system to help the driver. Initially, we used a MEFI-4 controller with a UMI cable throttle-body. So how does all of this translate to use on their boat? Per Weisman, “We used an aftermarket dry sump tank to increase the oil capacity for the long straights at wide open throttle. Details on all of the transmissions Weismann offers can be viewed on their website.ĭry sump tanks increase oil capacity and keep the engines fed during long stretches of acceleration.
As you can see, it’s been designed for versatility.” We think it’s safe to assume, you can now add ‘twin LS7-powered boat’ to the list of compatible platforms. We made a special case so the trans would bolt to the drive on our boat. It can also be made into a 4-wheel drive system with the addition of a drop-box. “The internals can be coupled with the WHT differential section, and be made into a transaxle. “The WBD was engineered as a unit,” Weismann explains. The transmission he is referring to is the one they’ve engineered and manufactured for use in trophy trucks and a supercharged LS7 swapped Ferrari 360 (among others), that has a history with the Indianapolis 500 that dates back to 1963. Designed to fit within the confines of tight spaces, this unit provides some serious torque handling capabilities for any application, not just road vehicles. We couldn’t have put it better ourselves. It’s obvious the passion they have for their business has bled over into their own boat. For over 51 years now, they’ve dedicated their expertise to becoming a world leader in innovating everything watercraft, marine, and road racing related, specializing in transmissions and custom designed watercraft parts. Weismann is well-known in the offshore racing community “We have never known Weismann to do anything normal, and we expect nothing less!”īoth Kutscher and Weismann are the owners of Traction Products Inc/Weismann Marine LLC, based in Costa Mesa, California.
Builders Dave Kutscher and Pat Weismann are no strangers to LS engines and everything it takes to stuff one (or should we say two?) into a jet boat. This my friends, is a badass, 1,320 horsepower racing boat powered by two LS7 7.0 liter C6 Z06 Corvette engines. We’ve covered a few LS-swapped boat stories in the past, like Jeff Jost’s LQ4 6.0 liter truck motor swapped jet boat and this video documenting an LSA 6.2 liter swapped into a customer’s boat by the experts at Michigan Motorz, but none like this one.
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