JustinOlson Posted August 4, 2008 Share Posted August 4, 2008 I haven't added injector ports to the model yet. As you can see the runners follow the 98 degree incline of the intake ports from flange mounting surface. The plenum is modeled out of 0.125" thickness material. The velocity stacks and runner material are from Ross Machining. The plenum material is readily available. I was going to use the factory intake flange, but the ports are being enlarged a lot from their factory cross section. This just seems like a cleaner way to get everything done. I'm going to model 2 injectors per cylinder. I'm placing the injectors up the runner for better atomization. Justin Quote Link to comment Share on other sites More sharing options...
v8dats Posted August 4, 2008 Share Posted August 4, 2008 cool stuff! Quote Link to comment Share on other sites More sharing options...
Gritz Posted August 4, 2008 Share Posted August 4, 2008 It would be cool if you could some how design it to also work with 1jz..something like a interchangeable center section, or interchangeable runners, flange..??? Awesome gfx though!!! Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted August 5, 2008 Author Share Posted August 5, 2008 I made the front of the plenum smaller. Anyone able to flow this manifold model for me? I'm wonder if its any good... Justin Quote Link to comment Share on other sites More sharing options...
StreetFighter Posted August 9, 2008 Share Posted August 9, 2008 That's funny. The plenum looks exactly like mine, but I used a stock lower. The ports match the head very well, and have a lot of material to cut velocity stacks into, but the runner length is longer than even a stock GTE lower intake manifold. It took around 12 hours to build, and I used a BBK 75mm. I only have a 67mm turbo, so I would just lose drivability with a larger throttle body. end result Quote Link to comment Share on other sites More sharing options...
Z-Gad Posted August 11, 2008 Share Posted August 11, 2008 Very nice looking manifold! Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted August 11, 2008 Share Posted August 11, 2008 Justin, IMHO, overrated. Just port the stocker. Darin is doing just fine @ 1300+hp with a Titan ported stocker. HP will be the least of your issues . Put those $$$ in the chassis. Quote Link to comment Share on other sites More sharing options...
v8dats Posted August 11, 2008 Share Posted August 11, 2008 very nice indeed! love the welds. Quote Link to comment Share on other sites More sharing options...
StreetFighter Posted August 11, 2008 Share Posted August 11, 2008 Justin, IMHO, overrated. Just port the stocker. Darin is doing just fine @ 1300+hp with a Titan ported stocker. HP will be the least of your issues . Put those $$$ in the chassis. If it were a GTE, then I would agree with you, but the NA intake manifolds are total garbage. They flip back around and go over the valve covers, and look like butt. Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted August 13, 2008 Author Share Posted August 13, 2008 I revised the plenum shape based on the CFD testing of the L28 manifold I modeled up. Here are some pictures. Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted August 14, 2008 Author Share Posted August 14, 2008 Here are some initial results for the REV 2 plenum flowed at 25" H20 with runners going down to factory port size. There is flow left on the table hear having the runners neck down to the factory port cross section. Regards, Justin Quote Link to comment Share on other sites More sharing options...
ShaggyZ Posted August 15, 2008 Share Posted August 15, 2008 I know very little about flow charts, but that looks great and the pictures are pretty. Quote Link to comment Share on other sites More sharing options...
g00kb0i Posted August 16, 2008 Share Posted August 16, 2008 i dont know anything myself either but thats almost a 10% variation between cylinder 1 & 2. that is more than enough to run lean and knock. but i guess knowing that before hand, you can just tune each injector. are you planning on changing anything? Quote Link to comment Share on other sites More sharing options...
T04GTR Posted December 26, 2009 Share Posted December 26, 2009 interesting, im making one for my rb26 using the rmr oval runner, im also trying to see if its worth using 2 injectors per port. whats your ideas on this? rather type of injector vs distance from port. ie: distance injectors so the spray is fanned out to the diametre of each valve port? etc etc. Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted January 14, 2010 Author Share Posted January 14, 2010 I ended up buying a very similar manifold that has a cast plenum with internal velocity stacks. It makes very good power on Jason @ Big Daddy's S14: Link to his dyno thread: http://e85forum.com/about1086.html Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted January 19, 2010 Author Share Posted January 19, 2010 My PNT intake manifold came in today. I'm very impressed by the build quality. The only negative I see is the plenum casting is a bit wavy so the polished finish doesn't look the greatest. I will likely have it powder coated or paint it with wrinkle finish. The runners have a nice tapered shape just like the factory veilside intake. The throttle body flange is very nicely machined. There is no casting flash or debris that I can find that would need to be cleaned up. All flanges are flat with good surface finish for gasket sealing. Justin Quote Link to comment Share on other sites More sharing options...
piston Posted January 22, 2010 Share Posted January 22, 2010 i thought you were going to make your own manifold? it looks almost as if the stacks were on there to begin with. so nice and clean. thinking if i go n/a, i will be making one like the FSR one using rossmachinines D shape plenum and q45 tb plate and just drill the plenum piece and bolt it to my n/a runners. round off the holes inside the chamber outward to compensate stacks. i know its not going to flow as well, but it opens it up more than the n/a manifold and cant see how it wouldn't outflow the stock under boost. i seen evos280z n/a jz manifold in the member project forums and looks almost like he ditched the stacks and just ported it out like how i mentioned above. i could be wrong. what do you think? Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted January 25, 2010 Author Share Posted January 25, 2010 Here is how this manifold fits so far in my mock up: Quote Link to comment Share on other sites More sharing options...
ask92 Posted February 7, 2010 Share Posted February 7, 2010 Looks great!!!If you don't mind me asking,what computer program(s) did you use to make that model? Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted February 8, 2010 Author Share Posted February 8, 2010 Solidworks! Quote Link to comment Share on other sites More sharing options...
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