You know... I’ve always wanted to make a set of heads that have crank that powers a second piston for secondary cylinder with the plugs and intake on the inside side and exhaust on the outside so the combustion chamber is between the two pistons and the secondary crank on top it chain driven by the bottom main crank. Kinda like bolting on another engine... Any clue if it would be a worthwhile idea?
Any recommendations? Should I from scratch it or hack the top off a matching engine and build the rest?
you mean like this? http://www.motorauthority.com/blog/1034049_former-vw-powertrain-chief-builds-super-efficient-engine
http://upload.wikimedia.org/wikiped...e.gif/347px-Napier_deltic_animation_large.gif Its called a naiper deltic I belive its a diesel and used on trains over in europe.
Here is a patent from '57 http://www.google.com/patents?id=G1...pages&cad=0_1#v=onepage&q=engine ford&f=false And one by Ford in '42 http://www.google.com/patents?id=CO...pages&cad=0_1#v=onepage&q=engine ford&f=false And since I have never seen one actually running, I say go for it!
sonofa*****.. seems it HAS been done before.. but not on a hotrod ... yet. i'll start with a straight 4 or 6cyl after that i'll give it a whack with a flatty 8. this will take some time, but i think it's worth it ... sides.. i want to hear how it sounds!... ought be odd and mean.
You know, it might be easier to use something like a lawnmower engine for testing. They are cheap, you can cut them up, and their simplicity means you might not have to work quite to hard to get a prototype together.
you know, i should have thought of that first.. thanks man, you might have just helped me a **** load. flyin' by the seat of your pants aint' easy.
Well I have found that aluminum lawn mower engines explode real ****in pretty when you have too much compression. But it did work for about 2 seconds. Time for try #2, this time with pics and a vid so people know how I died. lol. Oh and I ought to check the piston clearance and compression... might keep my legs from catching any more shrap.
Bloodandmotoroil thanks for that idea on a caffeine high. I mean if it wasn't for the link to that sight I would still be trying to figure this out. Killer concept A+ to you.
Look up the Commer "knocker" engine. It's a diesel version of what your talking about. My local speedway has one as a water track, it's the loudest thing in the world you can hear it from miles away. Hayden
And here all I want is a hemispherical combustion chamber with tri-oval shaped valves that contour to the chamber walls...the result would be larger valves while retaining a smaller high compression hemi chamber and with tri-oval shaped ports it would breathe nice and smooth instead of slamming air from round to square and back to round shapes...
I bet that made your heart jump. I can't wait to see a video of v2.0. Just keep that compression a bit lower.
I was thinking of using propane at first with the opposed cylinder mill. . hey, any of you ever thought to add an expansion chamber to your exhaust and have a spark plug in it so instead of a normal flame throwing set up you get a mini pulse jet... would be... interesting.
There was a car built in the teens that had this set up. It didn't work as well as expected but they also didn't have the higher technology back then.
im thinking of dual exaust ports at he bottom of the cylinder and intake at where the chamber is, course i might be polocking it that way, lol. and the mind boggles at what would happen if i had the pistons timed wrong... hmm.. should be simple to get right and i KNOW it's disastrious if i get it wrong.. or odd at the very least
I don't have the resources to cast or machine something as complex as the tri-oval valved hemi...the valves themselves would be domes as well, essentially making themselves into 2/3's of the combustion chamber...lots of multi-axis CNC machining and grinding involved there, not to mention insanely expensive to produce on a m*** scale, which renders the concept moot...but still fun to think about...
The Jalopy Journal
