The only proper thing to do with two bikes, scrap them, weld the engines together and you have a brilliant little V8 [:D]
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<font color="blue"><i>1980 TR7 DHC (my first car, now restored and back on the road)
1981 TR7 FHC Sprint (better known as 't Kreng)</font id="blue">
<b>[url="http://www.tr7beans.blogspot.com/"]<u><b><font size="2"><font color="red">My Weblog</font id="red"></font id="size2"></b></u>[/url]</b></i></center>
Looks really nice, love how small the cylinder block is.
This is what Daimler did, when they built their V8 Dart/SP250 engine, based on a bike engine. What a pity the car was not a bit prettier.
I'm not sure now if it was a production version, or only a prototype I saw pictures of, running around with 8 Amal [motor bike] carbs attached. Now that would have tested some of us who fancy ourselves as carby tuners.
Interestingly, when Jag inherited the thing with Daimler they had to kill the it off, as it made the XK engines look, & perform, a bit like an old side valve in comparison.
Funny now to think that the Jag XK engines were once considered so exotic that only specialists even touched them.
If a regular car had X hours of engineering time invested in its design.
Motorcycles have atleast 10X hours if not more.
If you look at an motorcycle engine block or any other components you will see that everything is as thin as it can be, there 's no material where it shoudnt be. Everything is made to minimum weight and volume possible. Not to mention materials used.
The local Chemainus Caterham manufacturer (for Canada) uses the 4 cylinder Suzuki engine (mentioned in Marko's link) in it's cars. His own car is a supercharged one with something like 360 hp. In 2009 he did a speed test at the Cassidy airport and did 109 mph (in reverse). Could have gone faster but the runway was wet.