Guest Cap'n Morgan Posted September 19, 2007 Share Posted September 19, 2007 In the process of sorting a custom intake manifold for a 2000cc Quad throttle project Im not going to talk about cos its not exactly Oldschool recognised But I reckon the manifold would apply to any car old or new. Ive been tossing up what materials to use and although ive seen a few made from stainless, I reckon Aluminium would work just as well, I have a good supply of high grade Ally and a few good contacts for fabrication. Now one dilemma is whether to chop off the original manifold just after the injector ports to retain the mounts for the fuel rail and try to weld on an adaptor flange for the quads, or I could go fully fabricated like 'Mikuni's' awesome Chevette setup only in Ally. Might also try and retain the original head flange and fabricate the manifold from there out. So any thoughts / arguments to put forward? Quote Link to comment Share on other sites More sharing options...
thminiman Posted September 19, 2007 Share Posted September 19, 2007 oh hey chad boe dont be scared to mention project, your stz isnt THAT newschool, plus, relativley closely related to a few guys off here, like boe-rads/mikuni's as you mentioned material prolly doesnt matter, ally will/would cost more in both raw material and fabriction cost's but if you've got hookups then thats nothing to worry about design, things to think about would be filter positioning, volume (more info will likely be revealed by someone/brad, flow into the throttle body's and so on Quote Link to comment Share on other sites More sharing options...
Guest Cap'n Morgan Posted September 19, 2007 Share Posted September 19, 2007 Ive been told not to post any project threads on my car becos its not oldschool. I beg to differ since I do all my own work in my workshop at home and pretty much go about shit the same hands on way that all you boes do. My cars are just 5 years or so too new for your criteria it seems, motors are still classics which is all that matters to me, so I'll jus keep my mouth shut about my Vectras Oh shit I said it! I reckon I can write off my intake manifold as a new project at work since I run the R&D department LOL, Ill get the flanges water cut and write them off as samples Quote Link to comment Share on other sites More sharing options...
mikuni Posted September 19, 2007 Share Posted September 19, 2007 I'd make it from ally. My stainless one was a fuck up. We looked at cutting the intake manifold up and going from there but most engineers prefer to just start from scratch rather than add onto something and boogy it up. Plus welding nicely on cast alloy is a cunt and you really want it to be done nicely for flow. The injectors only require an appropriate diameter tube welded on to the intake that the o-ring seals nicely in and something to hold them/the fuel rail on. Pretty simple really so another reason using a hacked factory manifold probably isn't worth it. If you have enough room try to get them on top and pointing down into the valves but the 20v throttles make this difficult if space is tight. You might want to think about flipping them upside down so the linkages are on the bottom if that makes it easier to get the injectors on top. edit: haha we can see you're sig pic, we know you have vectras. I like them, they just aren't really that fitting to the site. As I said, get a Manta C20XE Quote Link to comment Share on other sites More sharing options...
Josh Posted September 19, 2007 Share Posted September 19, 2007 My ones from alloy also (off RTs old engine) Is set up pretty well, heres a pic of it if your after ideas: Quote Link to comment Share on other sites More sharing options...
Mike-e Posted September 19, 2007 Share Posted September 19, 2007 Ive been told not to post any project threads on my car becos its not oldschool. 1st rule of os: dont worry about what is and what isnt os. , I'd make it from ally. My stainless one was a fuck up. this is true. who would be making it? yourself? Quote Link to comment Share on other sites More sharing options...
thegreatestben Posted September 19, 2007 Share Posted September 19, 2007 Yuh cunts will give you stick whether its OS or not. Engine in my car features in cars dating back to mid 80's, car was designed in the 80's etc. Good enough for me. I'm keen to weld a new plenum onto my runners. Examples of this on 1g's the 2nd is on a 442rwhp engine. Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 19, 2007 Share Posted September 19, 2007 ^ your cars not OS boe get over it, those turbo manifolds aren't really any use for quads are they. Make it from alloy, so much easier to port match it afterwards and stainless is way to heavy. Chopping the original manifold is going to be an abortion make up a flange for the head and 4 flanges for the throttles and get some cunt to weld some pipe in between at the length/angle you want. Then drill holes and weld on injector bosses also weld up some mounting points to bolt the fuel rail down get a after market computer and tune Quote Link to comment Share on other sites More sharing options...
Mike-e Posted September 19, 2007 Share Posted September 19, 2007 ^question = answered Quote Link to comment Share on other sites More sharing options...
Guest Cap'n Morgan Posted September 19, 2007 Share Posted September 19, 2007 Yeh thats where im heading. Might as well start shopping, yaaaah! Ill probably be doing most of the work except for the welding Have to make sure the injector bushes are just right since my injectors have 'angled' spray patterns. Quote Link to comment Share on other sites More sharing options...
Mike-e Posted September 19, 2007 Share Posted September 19, 2007 ^ fuck that sounds cunty! sweet if your not welding it then id go with alu as well coubikecarbsgh Quote Link to comment Share on other sites More sharing options...
Guest Cap'n Morgan Posted September 19, 2007 Share Posted September 19, 2007 Definitely going ally now. Found some sheets of 5mm 6060 Ally and heaps of ally tube in different sizes. Im gonna nab it before it goes to scrap. Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 19, 2007 Share Posted September 19, 2007 make your flanges thicker than 5mm, 8mm minimum Quote Link to comment Share on other sites More sharing options...
Guest Cap'n Morgan Posted September 19, 2007 Share Posted September 19, 2007 Riiight, back to the scrap pile. Dudes in the factory are lookin at me sideways since im waist deep, inverted in a skip full of Ally off cuts LOL Quote Link to comment Share on other sites More sharing options...
cute wee gem Posted September 20, 2007 Share Posted September 20, 2007 Ive been told not to post any project threads on my car becos its not oldschool. Screw them. There are guys here with newer cars aswell. Plus we need more Opels here Just pop one of them XE's into something old Or sell one to me Quote Link to comment Share on other sites More sharing options...
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