J.A. Ackley
J.A. Ackley Senior Editor
10/11/24 2:56 p.m.
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The Tire Rack Ultimate Track Car Challenge Presented by Grassroots Motorsports is now just two weeks away, October 24-25. However, you can still sign up and join the field that includes this 2013 Radical SR8 of Heikki Rinta-Koski.

Heikki calls his Radical a “very grassroots effort made with production parts.” He adds, the power plant consists of “two Suzuki Hayabusa …

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Flynlow
Flynlow Dork
10/11/24 4:39 p.m.

Two blocks???  Two hayabusa cylinder heads maybe?

Tom1200
Tom1200 PowerDork
10/11/24 5:25 p.m.

In reply to Flynlow :

From memory they use a pair of motors make a V8.

Jesse Ransom
Jesse Ransom GRM+ Memberand MegaDork
10/12/24 1:52 p.m.

I've heard of using two literbike heads on a low-production V8 block (almost said "custom" but I don't think that's the right word here) and I think it's not uncommon in a Radical, but to say using two blocks is weird. Seems at that point you're just talking about two Hayabusa engines, though I guess there's the question of the gearbox guts and how they're joined up...

Two full engines/blocks seems hard to package, especially in something like a Radical. I'm curious to hear what the reality is.

EDIT: Yeah, Radical even does their own: https://en.wikipedia.org/wiki/Powertec_RPA

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