wax Posted May 20, 2009 Share Posted May 20, 2009 Ok well i have been looking around and to be honest none of those manifolds i see out seem to have much put in in the way of thought And they are down right ugly if you ask me So here is my take on the manifold situation Its just starting out so easy on me As you know or should know the general of thumb is plenum at 1.5 time engine capacity So 2.8 = 4.2 on the plenum Well we all know the std one is unlikely to be even 2.8 litres So its out with the alloy cutoff wheel and here we go Quote Link to comment Share on other sites More sharing options...
wax Posted May 20, 2009 Author Share Posted May 20, 2009 these panels will be welded in and will increase the size of the plenum as well as give a better approach to the front runner Quote Link to comment Share on other sites More sharing options...
woldson Posted May 20, 2009 Share Posted May 20, 2009 Interesting! Be interested in your progress! Quote Link to comment Share on other sites More sharing options...
wax Posted May 20, 2009 Author Share Posted May 20, 2009 Thanks just working on throttle bodies at the moment Im looking for about a 65-70mm I will just get the manifold sorted before i buy one Tomorrow its in the runners with a die grinder getting there flow up Just bring out the runners 3mm in diameter will bring up the area by 20% as well the cleaning up is going to help the flow alot as well Quote Link to comment Share on other sites More sharing options...
Challenger Posted May 20, 2009 Share Posted May 20, 2009 Are you going to enlarge the runners that much to make a difference? One thing to concentrate on is getting more air into the 1st and 2nd runners. They seem to get starved. Quote Link to comment Share on other sites More sharing options...
wax Posted May 20, 2009 Author Share Posted May 20, 2009 Not sure how much i can enlarge them but have een porting it this morning and i agree with you, the 1 and 2 runners are badly obstructed. BY widening the front of the plenum i am hoping to get a much better approach on them. Because my manifold started of as an egr manifold it has a nasty kick on the bottom of the runners. I spent alot of time there getting rid of that. Quote Link to comment Share on other sites More sharing options...
Challenger Posted May 20, 2009 Share Posted May 20, 2009 Might try to angle to TB opening a little towards the first few runners. That might help. Id like to try this with one of my manifolds. I tried it last spring with a turbo manifold but didnt get far due to lack of proper tools. Quote Link to comment Share on other sites More sharing options...
wax Posted May 20, 2009 Author Share Posted May 20, 2009 Yeah thats what u have in mind,to come in it on an angle. Im just making the top and the bottom at the moment and then i will band saw the front flat and at an angle with a plate on it to bolt a throttle body too. Quote Link to comment Share on other sites More sharing options...
Challenger Posted May 20, 2009 Share Posted May 20, 2009 Sweet, do post pics as you make progress. Also I dont think thats an l28et manifold. Looks like the stock 280zx engines manifold. Quote Link to comment Share on other sites More sharing options...
wax Posted May 21, 2009 Author Share Posted May 21, 2009 I didnt think there was a difference. But im just new to the l6 series engine Can you tell me what the differences are please Quote Link to comment Share on other sites More sharing options...
Globerunner513 Posted May 21, 2009 Share Posted May 21, 2009 my L28et manifold was webbed too...looks like the one posted. But I dont remember exactly. Quote Link to comment Share on other sites More sharing options...
jc052685 Posted May 21, 2009 Share Posted May 21, 2009 that is a non turbo manifold. The turbo manifolds plenum is the same as the N42. Quote Link to comment Share on other sites More sharing options...
Globerunner513 Posted May 21, 2009 Share Posted May 21, 2009 Found a picture of my Turbo manifold. Don't remember what year, but it was a turbo ZX in the junkyard I got it from. Quote Link to comment Share on other sites More sharing options...
garvice Posted May 21, 2009 Share Posted May 21, 2009 Subscribed here too. Quote Link to comment Share on other sites More sharing options...
Challenger Posted May 21, 2009 Share Posted May 21, 2009 that is a non turbo manifold. The turbo manifolds plenum is the same as the N42. Yeah their very similar give or take some of the large holes for the pop off valve and air regulator thing. Quote Link to comment Share on other sites More sharing options...
Globerunner513 Posted May 21, 2009 Share Posted May 21, 2009 yeah, now looking at the two, I definitely see the differences. Good catch guys. Quote Link to comment Share on other sites More sharing options...
wax Posted May 21, 2009 Author Share Posted May 21, 2009 Yeah i can clearly seem some differences. I think its a very simillar casting with some added holes for the pressure relief valve etc Like my one thats an egr intake , a pain really as you have to grind it all off If you go to a hardware shop you can buy wheels for your grinder that cut alloy and man do they cut alloy I was going to take some more pics but i havent finished the porting so i will wait until then to put some more pics up On a side note buffing compound for an buffer makes a great thing to stop the cutting tip from clogging Quote Link to comment Share on other sites More sharing options...
wax Posted May 21, 2009 Author Share Posted May 21, 2009 Im waing for my long burr to come in so i can get into the middle of the runner on this manifold should be here in a couple of days Quote Link to comment Share on other sites More sharing options...
wax Posted May 22, 2009 Author Share Posted May 22, 2009 Ok well got in there with the porting tools when i started i couldnt fit a 32mm ball bearing down there now i can roll a 35mm one straight down there I also cleaned out the short turn alot so that its a more direct flow Im very happy with the result the pictures dont show it as well as it should, but you get the idea I have started to clean up around the outside of the manifold , the casting marks will all come off then i will take it down and get it sandblasted to give it that sand cast look again. My goal is to make it look like an aftermarket manifold and not a hand fab job Quote Link to comment Share on other sites More sharing options...
wax Posted May 22, 2009 Author Share Posted May 22, 2009 ahh the photos look real bad because of the reflection of the shiny surfaces I will take some better ones tomorrow Quote Link to comment Share on other sites More sharing options...
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