Guest TeamNissan Posted March 21, 2007 Share Posted March 21, 2007 Anyone ever try running the ld28 intake mani on a n/a or t l28? The runners look much longer and I'd think that would give you better low end tq. I think it look its looks better then the n42 as well but thats just me. I'm not planning on using it, maybe trying it in the future for shits and giggles to give a formal comp. I kind of just want to hear what you all think. Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted March 21, 2007 Share Posted March 21, 2007 Three problems come to mind. Possible hood clearance issues and NO injector bungs. The first may require lowering the engine slightly and the second a trip to the machine shop. Third, you'll also need to weld on a plate for the throttle body unless it's mounted remotely. Lots of if's that will need closer examination. The diesel intake has the longer runners and they are larger diameter than the stock L28 runners too. I might try this on my LD28 stroker I'm going to build. It's on my long "to do" list. Quote Link to comment Share on other sites More sharing options...
steveosupremeo Posted March 21, 2007 Share Posted March 21, 2007 hood clearance not an issue, easiest way to add injectors is cut the end of the runners off of a z manifold and port them to match, then cut the flange end off of the diesel manifold and weld up the bung flange to the manifold. then have a throttle plate welded up. Quote Link to comment Share on other sites More sharing options...
ezzzzzzz Posted March 22, 2007 Share Posted March 22, 2007 Sounds reasonable enough to me. Quote Link to comment Share on other sites More sharing options...
1 fast z Posted March 22, 2007 Share Posted March 22, 2007 Clears the hood fine, and strut tower. Quote Link to comment Share on other sites More sharing options...
Guest TeamNissan Posted March 22, 2007 Share Posted March 22, 2007 Now THATS what I'm talking about. Have you run that? Any notable change in numbers and curve? Quote Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted March 22, 2007 Administrators Share Posted March 22, 2007 ... Clears the hood fine, and strut tower. Bryan, As usual with everything you do, nice work. Out of curiosity, what is the ID of the runners on these LD intakes? Quote Link to comment Share on other sites More sharing options...
mario_82_ZXT Posted March 22, 2007 Share Posted March 22, 2007 The number I've heard thrown around is 35mm. Not 100% sure though... Bryan, has that intake been run yet? Mario Quote Link to comment Share on other sites More sharing options...
Thanh Posted March 22, 2007 Share Posted March 22, 2007 Bryan, As usual with everything you do, nice work. Out of curiosity, what is the ID of the runners on these LD intakes? My god that thing is Enormous. Quote Link to comment Share on other sites More sharing options...
Guest TeamNissan Posted March 22, 2007 Share Posted March 22, 2007 Thats what I like about it though. The longer runners will make better tq down low and the plenum being so many more cc's with a nice big throttle body the response should be improved as well. 1 fast z do you think those injectors mite be a little too far away? Maybe loose atomization efficiency? Quote Link to comment Share on other sites More sharing options...
thehelix112 Posted March 22, 2007 Share Posted March 22, 2007 The further the injector from the engine the better atomization you get. Autospeed(.com) has an article on it somewhere, was someone's PhD thesis. Also, F1 engines inject into the trumpet. Dave Quote Link to comment Share on other sites More sharing options...
Administrators BRAAP Posted March 22, 2007 Administrators Share Posted March 22, 2007 As Dave mentioned, F-1 engine designers set the injectors at trumpet entrance… Quote Link to comment Share on other sites More sharing options...
Pete84 Posted March 23, 2007 Share Posted March 23, 2007 Any bench flow testing or any other numbers? From the pictures it appears that the injectors have a very low angle to the air flow in the runners, and from what I've read that is good [ iirc ]. Looks good!! Quote Link to comment Share on other sites More sharing options...
1 fast z Posted March 23, 2007 Share Posted March 23, 2007 Yea the runners are 35mm Id, compared to the stock EFI stuff which is 30mm ID. I havent run it yet, I actually built it for a customer, who wants a engine to look "stock somewhat" to the Emissions Nazi's, and didnt want a custom sheet metal intake. Quote Link to comment Share on other sites More sharing options...
Daeron Posted March 23, 2007 Share Posted March 23, 2007 Okay, blatant display of my ignorance, but if I don't ask I won't learn... That huge intake pictured, is that (more or less) what the stock LD28 intake looked like? Obviously, the fuel injector bungs were not there, but you just welded the bungs onto the existing manifold, which bolts onto that ENORMOUS plenum? If so, I want one of these. first. before I buy any other hardware, I have found my intake manifold. Thanks. Quote Link to comment Share on other sites More sharing options...
Cody 82 ZXT Posted March 23, 2007 Share Posted March 23, 2007 No dought that thing is going to flow great at air RPM's. I wonder what the injector placement and the large runners are going to do to low RPM drivablilty? What type of car is it going in? Street car or full race? Quote Link to comment Share on other sites More sharing options...
Pete84 Posted March 23, 2007 Share Posted March 23, 2007 1 fast Z, what sort of increases have you gotten with sheet metal intakes? Never seen any data on them vs stock. Quote Link to comment Share on other sites More sharing options...
mario_82_ZXT Posted March 23, 2007 Share Posted March 23, 2007 Okay, blatant display of my ignorance, but if I don't ask I won't learn... That huge intake pictured, is that (more or less) what the stock LD28 intake looked like? Obviously, the fuel injector bungs were not there, but you just welded the bungs onto the existing manifold, which bolts onto that ENORMOUS plenum? If so, I want one of these. first. before I buy any other hardware, I have found my intake manifold. Thanks. You also need to weld on an adapter for the throttle body of choice, and do all the linkage stuff. The diesel engines had no throttle body and no injectors IIRC. Mario Quote Link to comment Share on other sites More sharing options...
Guest TeamNissan Posted March 23, 2007 Share Posted March 23, 2007 Ya its by means a easy thing to do but given the added runner ID, added cc's, longer runner length I'm betting it would be a nice improvement. I actualy have one laying around maybe I'll see what I can do. Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted March 23, 2007 Share Posted March 23, 2007 If anyone has an extra manifold I'd like to try shorten the runners and weld the plenum onto the lower runners. Justin Quote Link to comment Share on other sites More sharing options...
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