who cares if its lighter? honestly who swaps in a motor just to leave it 100% stock



the difference in POWER make the few lbs of difference a moot point



the difference in FUEL MILEAGE make the lbs difference a moot point



the difference in RELIABILITY make the few lbs of difference a moot point

 

Nope.



You can get over 1000hp N/A out of a LSX block.

http://www.youtube.com/watch?v=fnq7qja7As8



Look up 2000hp rotary - there will be no relevant results.



Look up 2000hp LSX and you'll get a lot of links, including this:

http://www.youtube.com/watch?v=ArUFGCLMZxE



Look up 3200hp LSX and you'll find this link, where you can buy one for $38,500.



That's not quite but in the neighborhood of twice the most powerful rotary I could find.

 

I have a target weight.

The ls-blah in stock trim shoots me over that weight limit.



An 86 6 port NA 13B fits my needs for weight, hp, and torque in the chassis I am designing.



If I wanted raw power I'd use an all aluminum W16 with titanium rods...

 

Why not run a Hayabusa engine if you're worried about weight?

 

I think Radical SR8's are pretty darn light and they run V8's made from a custom block and crank with two 'Busa heads and two sets of 'Busa rods/pistons. If that's too pricey, a stock 'Busa motor should work great. Plus, it comes neatly packaged with an included 6 speed sequential dog-box tranny.

 

Thought about it, but in the end a bike engine needs more work to fit into the chassis.



I could redesign, but I've got 4 iterations on this design and it's getting better and better.



Sorry to get this so off topic...

 

No one said it was a swap to stock, I keep saying various porting methods are still able to make good raw power. And a 4mpg difference in economy isn't going to negate the lb difference if you are using a light enough chassis to begin with. The power difference is only present if you're referring to drag racing and require 4 figures but don't have access to turbo parts. In fact, contrary to the obvious overwhelming opinion there are a number of r26b builds out there that are purpose built drag cars, in fact go back to the 787 whose n/a quad rotor produced 700hp. As for the reliability argument, any engine whose fan-base regards 150k as "just breaking it in" cant relly by definition be called unreliable. What's unreliable are these multi-thousand hp drag cars that you guys keep posting, which require a rebuild between each race. This really has gotten silly.

 

Busa engines don't have an appropriate powerband for use in a heavy vehicle, imho.

 

A custom built car with an "under 50 inch width" (as stated above), shouldn't be very heavy.

 

Well. It's not very heavy, but pretty heavy compared to the sportbike it came from. If you took the engine from a large ag bike, that might be another story.