Pullstart 62,905 #1 Posted February 1, 2022 How much internal work would need to be done to make this happen? 3 Share this post Link to post Share on other sites
Snoopy11 5,714 #2 Posted February 1, 2022 4 minutes ago, Pullstart said: How much internal work would need to be done to make this happen? Hmm... well... let's take a 2.3 Ford motor for example. @Snoopy11 @Pullstart Dual spark plug setup... swapping intake manifold to the exhaust manifold side could be done with a little fab work... (why I don't know)... exhaust could be put on intake side. It has hydraulic lifters... so not much to adjust there. Timing... probably would stay the same... I would imagine... Would it run? Probably... I think... you would probably make less power with an engine like this... since the intake valves would be downsized to 30mm. Less air in... So... why would you do it??? Don Share this post Link to post Share on other sites
Pullstart 62,905 #3 Posted February 1, 2022 1 minute ago, Snoopy11 said: Hmm... well... let's take a 2.3 Ford motor for example. @Snoopy11 @Pullstart Dual spark plug setup... swapping intake manifold to the exhaust manifold side could be done with a little fab work... (why I don't know)... exhaust could be put on intake side. It has hydraulic lifters... so not much to adjust there. Timing... probably would stay the same... I would imagine... Would it run? Probably... I think... you would probably make less power with an engine like this... since the intake valves would be downsized to 30mm. Less air in... So... why would you do it??? Don It would be a goofy cam too, would it not be? It would be perfect for building a claimer engine in circle track! Not one person would wanna claim it! 1 1 1 Share this post Link to post Share on other sites
8ntruck 7,011 #4 Posted February 1, 2022 (edited) Just to make it run, a cam change would do it. I suppose you might be able to get there with a stock can by getting creative with the valve train to somehow get the intake lobes and exhaust lobes to actuate the opposite valve in the heads. To make it run right, I think one would need custom heads to optimize the intake and exhaust valve sizes and a custom cam with lobes that line up with the valves. Or, possibly using a reverse rotation cam with the crank running in the normal direction? The Ford Cosworth Indy engines in the mid '60s had reverse flow heads to allow using 180 degree headers in the valley of the V for better exhaust tuning. I think they used them in the small block GT40's too. Edited February 1, 2022 by 8ntruck 2 1 1 Share this post Link to post Share on other sites
Snoopy11 5,714 #5 Posted February 1, 2022 1 minute ago, Pullstart said: It would be a goofy cam too, would it not be? It would be perfect for building a claimer engine in circle track! Not one person would wanna claim it! Thinking more here... it simply has to be cam timing. Unless it was custom made for this application, there probably isn't a way to time it at OEM specs... and it actually run Don Share this post Link to post Share on other sites
Snoopy11 5,714 #6 Posted February 1, 2022 1 minute ago, 8ntruck said: reverse rotation cam That is exactly what I was thinking... or doing a 180 degree turn on the cam. Don Share this post Link to post Share on other sites
8ntruck 7,011 #7 Posted February 1, 2022 (edited) 58 minutes ago, Snoopy11 said: That is exactly what I was thinking... or doing a 180 degree turn on the cam. Don Yup. It could be that simple. Give you a great big exhaust valve and a teensy tiny intake valve, though. Edited February 1, 2022 by 8ntruck 1 Share this post Link to post Share on other sites
Snoopy11 5,714 #8 Posted February 1, 2022 2 minutes ago, 8ntruck said: Yup. It could be that simple. Give you a great big intake valve and a teensy tiny exhaust valve, though. Kinda reverse logic on a 2.3. It would give you a small intake valve, and a big exhaust valve. Exactly what you don't want. Don Share this post Link to post Share on other sites
ri702bill 8,327 #9 Posted February 1, 2022 OK, maybe it's just me - It's an anemic 305!! So what the valve size is all wrong - did this guy use the MerCruiser reverse rotation engine camshaft and run it in the normal direction?? It may run, just to prove a point, but is probably lacking in the "cookie" department. Interesting adaptation though ... Bill 2 Share this post Link to post Share on other sites
Snoopy11 5,714 #10 Posted February 1, 2022 1 minute ago, ri702bill said: lacking in the "cookie" department Understatement. But then again... maybe the nutty-professor that built it doesn't like cookies...? Don 1 Share this post Link to post Share on other sites
Achto 27,594 #11 Posted February 1, 2022 (edited) 59 minutes ago, Snoopy11 said: why would you do it? Because you can, why else. Many have made a 2 stroke run backwards, ain't nothing to that. Not many have tried to make a 4 stroke run reverse flow. Running the cam backwards to achieve this would not be that difficult. Just run gear to gear instead of chain drive. Edited February 1, 2022 by Achto 3 Share this post Link to post Share on other sites
Snoopy11 5,714 #12 Posted February 1, 2022 2 minutes ago, Achto said: Because you can, why else. Many have made a 2 stroke run backwards, ain't nothing to that. Not many have tried to make a 4 stroke run backwards. Running the cam backwards to achieve this would not be that difficult. Just run gear to gear instead of chain drive. I feel you... I do... ...you are trying... I... just... still... don't... see it.... Just seems like some unnecessary... eh... ...to me... Don Share this post Link to post Share on other sites
Jeff-C175 7,202 #13 Posted February 1, 2022 (edited) 1 hour ago, Pullstart said: goofy cam I had a friend decades ago that dropped a Chevy six into his Camaro to replace the one he blew up. It came out of a boat. It ran backwards! Can't recall all he had to do to make it work, but I know that the cam was one of the things... I guess the starter too, oil pump? water pump? Too bad he didn't realize it before he went ahead and installed it! Lotsa 'rework' had to be done! Edited February 1, 2022 by Jeff-C175 2 1 Share this post Link to post Share on other sites
squonk 41,133 #14 Posted February 1, 2022 You need a Reverse Ground camshaft otherwise when the Exhaust valve (now the intake ) opens the piston will be traveling up. Just reversing the rotation of it won't do it 1 1 Share this post Link to post Share on other sites
Jeff-C175 7,202 #15 Posted February 1, 2022 I just looked at the video... jeeze... I don't know if that one is running backwards or not? But the intake certainly is the exhaust and vice versa! WEIRD! That chevy six I mentioned was NOT 'reverse flow', it just ran backwards. Share this post Link to post Share on other sites
ebinmaine 67,546 #16 Posted February 1, 2022 1 hour ago, Achto said: Because you can, why else ^^^^^^^^^ This is the reason... 56 minutes ago, Snoopy11 said: I feel you... I do... ...you are trying... I... just... still... don't... see it.... Just seems like some unnecessary... eh... ...to me... ....... Says the guy who built hell horse If you guys poke around online for a few minutes I think you'll find there's more information. Seems to me I remember him doing that just for the exact single simple reason that he wanted to. 2 2 Share this post Link to post Share on other sites
roadapples 6,983 #17 Posted February 1, 2022 Hard to improve on a small block chevy... 1 Share this post Link to post Share on other sites
Snoopy11 5,714 #18 Posted February 1, 2022 1 hour ago, ebinmaine said: ....... Says the guy who built hell horse If you guys poke around online for a few minutes I think you'll find there's more information. Seems to me I remember him doing that just for the exact single simple reason that he wanted to. I am laughing ...excessively... well played, Eric... well played. I... have no comeback... Don 1 2 Share this post Link to post Share on other sites
