maxboost87 Posted February 24, 2011 Report Share Posted February 24, 2011 (edited) I am working with pc_85 on his engine build. We are rolling around some new ideas on intake design. I drew up a different style mpi intake, just want to see what everyone thinks about it. The reason for this is to work around the AC compressor and not have to relocate the battery and also keeping the stock style OVCP. Sorry for the high tech CAD drawing http://img824.imageshack.us/img824/876/intakeh.jpg Edited February 24, 2011 by maxboost87 Link to comment Share on other sites More sharing options...
Komeuppance Posted February 24, 2011 Report Share Posted February 24, 2011 Looks great... oh wait... what?? -Robert Link to comment Share on other sites More sharing options...
Bill Hincher Posted February 24, 2011 Report Share Posted February 24, 2011 because the columns of air organize and rush to the inlet port with the inlet valve open, you need to compensate for the inlet valve closing, when that happens the organized air wants to return up the inlet runner at the same speed it originally gathered, so allow yourself a lot of plenum for the air to defuse behind your air horn You should coordinate the ram effect with your lobe seperation of your cam design too Link to comment Share on other sites More sharing options...
Chad Posted February 24, 2011 Report Share Posted February 24, 2011 that design at those dimensions will hit the brake booster. Link to comment Share on other sites More sharing options...
maxboost87 Posted February 24, 2011 Author Report Share Posted February 24, 2011 (edited) The #1&4 runners will have a slight taper towards the center of the plenum so it will fit, plus it will be built while engine is still in the car. The 2 center runners will also have a slight bend to create even lengths between all 4. The plenum and runners will also be polished on the inside to help air flow. Plenum will be hammer formed in a 2 piece design out of annealed .125" 6061 and as much volume as i can make it. "would like to get it close to 2 sets of cylinders worth of volume" Velocity stacks are also going be incorporated. To me this design seems Superior to the conventional mpi manifolds that are used on all types of 4cyl mpi engines, especially when it comes to even distribution of air to cylinders. Edited February 26, 2011 by maxboost87 Link to comment Share on other sites More sharing options...
pc85 Posted February 24, 2011 Report Share Posted February 24, 2011 (edited) ... To me this design seems supiorior to the conventional mpi manifolds that are used on all types of 4cyl mpi engines, especially when it comes to even distribution of air to cylinders. Exactly, just what I said. HaHa Just Get'r done. Edited February 24, 2011 by pc85 Link to comment Share on other sites More sharing options...
Chad Posted February 24, 2011 Report Share Posted February 24, 2011 Plenum volume needs to be about 6 cylinders of volume (1.5 X's total engine displacement) for true performance gains. Polishing the runners won't help, and may hinder flow. small amounts of irregularity actually improve flow as they break up the boundary layer with micro vortexes on the irregular surface. Same reason a golf ball is dimpled... Link to comment Share on other sites More sharing options...
pc85 Posted February 24, 2011 Report Share Posted February 24, 2011 Plenum volume needs to be about 6 cylinders of volume (1.5 X's total engine displacement) for true performance gains. Polishing the runners won't help, and may hinder flow. small amounts of irregularity actually improve flow as they break up the boundary layer with micro vortexes on the irregular surface. Same reason a golf ball is dimpled... Very GOOD!!! Great info. Link to comment Share on other sites More sharing options...
Komeuppance Posted February 24, 2011 Report Share Posted February 24, 2011 Golf ball dimple the inside of the intake!! -Robert Link to comment Share on other sites More sharing options...
pc85 Posted February 24, 2011 Report Share Posted February 24, 2011 Golf ball dimple the inside of the intake!! Same principle, reduce surface tension, reduce friction, increase flow. Link to comment Share on other sites More sharing options...
Komeuppance Posted February 24, 2011 Report Share Posted February 24, 2011 Yes, I was agreeing with Chad. -Robert Link to comment Share on other sites More sharing options...
DzNutz Posted February 25, 2011 Report Share Posted February 25, 2011 If you can get me some more dimensioned drawings of this I could draw it up in Inventor and do some flow tests on it and such. Link to comment Share on other sites More sharing options...
monzaa Posted February 26, 2011 Report Share Posted February 26, 2011 Plenum volume needs to be about 6 cylinders of volume (1.5 X's total engine displacement) for true performance gains. Polishing the runners won't help, and may hinder flow. small amounts of irregularity actually improve flow as they break up the boundary layer with micro vortexes on the irregular surface. Same reason a golf ball is dimpled...if you dimple the inside of the runners would you start have a problem with carbon build up ? from the pcv system Link to comment Share on other sites More sharing options...
monzaa Posted February 26, 2011 Report Share Posted February 26, 2011 The #1&4 runners will have a slight taper towards the center of the plenum so it will fit, plus it will be built while engine is still in the car. The 2 center runners will also have a slight bend to create even lengths between all 4. The plenum and runners will also be polished on the inside to help air flow. Plenum will be hammer formed in a 2 peice design out of annealed .125" 6061 and as much volume as i can make it. "would like to get it close to 2 cylinders worth of volume" Velocity stacks are also going be incorporated. To me this design seems supiorior to the conventional mpi manifolds that are used on all types of 4cyl mpi engines, especially when it comes to even distribution of air to cylinders.make it out of clay like car desiner do play do rocks Link to comment Share on other sites More sharing options...
Earl Posted March 15, 2011 Report Share Posted March 15, 2011 updates? Link to comment Share on other sites More sharing options...
pc85 Posted September 16, 2011 Report Share Posted September 16, 2011 (edited) Long over due update on new MPI design, fabrication in progress:http://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/000_0587.jpghttp://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/000_0584.jpgGoal was to keep AC and not have to relocate battery. Edited September 16, 2011 by pc85 Link to comment Share on other sites More sharing options...
mtaylor530 Posted September 24, 2011 Report Share Posted September 24, 2011 WOW!!! wish they had a COMPLETE kit that came with EVERYTHING needed to go multi....VERY INTERESTED Link to comment Share on other sites More sharing options...
pc85 Posted September 25, 2011 Report Share Posted September 25, 2011 maxboost87 is fabricating this new MPI intake with fuel rail, throttlebody and injectors. That takes some of the work out of the MPI conversion and with this design you don't have to mess with the A/C nor the battery but you still need a new ECU, a lot of wiring and someone who knows how to tune. I'll let you know how this works out, at this point this is a big experiment. Link to comment Share on other sites More sharing options...
Indiana Posted September 25, 2011 Report Share Posted September 25, 2011 There was already an mpi intake similar to this about 14 years ago. Would you like see it? Link to comment Share on other sites More sharing options...
ucw458 Posted September 25, 2011 Report Share Posted September 25, 2011 with this design you don't have to mess with the A/C nor the battery You don't have to deal with that on a magna intake either. Having to move the batt, washer pump and remove ac has to do with bad choice of IC piping routes. There are solutions out there that don't require anything to be relocated. Stock batt and washer pump locations plus AC is retained in this setup. Piping is 2.5" diameter. http://i463.photobucket.com/albums/qq352/ucw458/MPI/DSC03802.jpg Link to comment Share on other sites More sharing options...
BIL Posted September 25, 2011 Report Share Posted September 25, 2011 Has anyone ever considered rifling the runners? I was thinking this might also improve swirl in the cylinder. I could be way off base. Link to comment Share on other sites More sharing options...
Indiana Posted September 26, 2011 Report Share Posted September 26, 2011 Has anyone ever considered rifling the runners? I was thinking this might also improve swirl in the cylinder. I could be way off base.Oh you didn't just mention a way to better swirl the incoming air charge did you? http://www.b2600turbo.com/images/stockjetvalves02.jpg Link to comment Share on other sites More sharing options...
pc85 Posted November 21, 2011 Report Share Posted November 21, 2011 More progress on the OVC MPIThrottle cable mount and fuel rail instal:http://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/0000611.jpgFuel line with inline filterhttp://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/0000618.jpgWiring for Haltech Sprint 500 ECU, roughing in OVC pipe:http://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/0000613.jpghttp://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/0000612h.jpgFinished OVC Pipe:http://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/000_0628.jpgFPR with SS braided fuel line:http://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/000_0666.jpgWiring almost complete, New NGK sparks, Taylor Racing spark cables:http://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/000_0672.jpgGot it started, needs some tuning. Link to comment Share on other sites More sharing options...
Funky Phil Posted November 21, 2011 Report Share Posted November 21, 2011 Looks real nice. Link to comment Share on other sites More sharing options...
BrazilBoy Posted November 22, 2011 Report Share Posted November 22, 2011 More progress on the OVC MPIThrottle cable mount and fuel rail instal:http://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/0000611.jpgFuel line with inline filterhttp://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/0000618.jpgWiring for Haltech Sprint 500 ECU, roughing in OVC pipe:http://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/0000613.jpghttp://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/0000612h.jpgFinished OVC Pipe:http://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/000_0628.jpgFPR with SS braided fuel line:http://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/000_0666.jpgWiring almost complete, New NGK sparks, Taylor Racing spark cables:http://i849.photobucket.com/albums/ab51/pc85dr/Engine%20Rebuild/000_0672.jpg Got it started, needs some tuning. http://www.google.com/search?tbm=isch&source=mog&hl=en&gl=us&client=ms-android-hms-tmobile-us&q=impressive%20most%20impressive&sa=N&biw=320&bih=508&sei=r-bKToqaHMWJsgLvqYhi#i=0 Impressive most Impressive Link to comment Share on other sites More sharing options...
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