locodrftr Posted March 28, 2009 Share Posted March 28, 2009 Well it was time i tried my skills at some fabrication work....and one of my first projects i thought of was to make a sheet metal manifold. I saw Zredbaron's twm induction box and thought i could make something similar except in aluminum. I didn't go off any blueprints or any realy serious calculations just what i have seen other do and what ive seen. Whether this thing works or not i have no idea until its done..i hope it does but only time will tell. This manifold is for my 40mm webers with the stock airhorns so my concern still is how im going to seal everything and still have access to the horns but i got an idea floating in my head for that problem. Aside from that, all this is a learning curve for me and i hope it goes well because i already have another design in head for another one. Anyway on with pictures of my progress so far...feel free to give me input or call me an idiot...worst case scenario i'll have a nice paper weight.lol Started with paper template... Cut out patern on aluminum for airhorns and rivited a stainless piece to go under the carbs for a heat shield here it is installed now here is the hand rolled aluminum and two sheared pieces of the main manifold tacked together me excited and doing a test fit lol A inside look of the shape and airhorns Here is the three pieces partially welded together end piece welded in..kind of a pain with limited space... 3" inlet mocked up....i dont like the round to square transition so its just a mock up for me to form the aluminum into a taper....paper came in handy at this point. And finally were at today..... a mock up of what the round to the tapered entry will look like... the round part will be for a silicone hose to connect to some duct work i'll run to the front and have that ram air effect i think...lol Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted March 28, 2009 Share Posted March 28, 2009 wow great looking plenum! very impressive!! did you mig those aluminum welds?! Quote Link to comment Share on other sites More sharing options...
josh817 Posted March 28, 2009 Share Posted March 28, 2009 Getting me all excited. @_@ Quote Link to comment Share on other sites More sharing options...
gnosez Posted March 28, 2009 Share Posted March 28, 2009 You should consider making the rear smaller by tapering the box to increase the air flow to the last set of carbs. I would also install much smaller horns (3/8-inch). Quote Link to comment Share on other sites More sharing options...
garvice Posted March 28, 2009 Share Posted March 28, 2009 Looking good mate, nice fab work. If this is one of your first projects, I can't wait to see some of your work in a few years Quote Link to comment Share on other sites More sharing options...
Mayolives Posted March 28, 2009 Share Posted March 28, 2009 locodrftr. There are many extremely experienced, knowledgeable, and talented fabricators who are Hybridz contributors. They often turn out very impressive parts. Your intake is a good first effort and contribution to the cause. Quote Link to comment Share on other sites More sharing options...
locodrftr Posted March 28, 2009 Author Share Posted March 28, 2009 Gnosez: yeah i still might taper down to the last air horn as i have seen it done on just about all aftermarket manifolds for Rbs....as for the smaller air horns i eventually will get smaller ones but i just dont feel like forking over the extra cash right now, these will have to do for now.... Proxlamus: Thanks,and everything that you see was tig welded......I always avoid mig welding anything i do....i just hate it lol Garvice: thanks man, In a few years i hope i would have made a ton of parts...parts that work well that is. Mayolives: Yeah alot of skilled people on here im just trying to pretend to be one lol Its a learning curve i guess...thanks for the support Josh: hey thanks man, how's the sanding going? you done yet?lol Good luck and i hope to see your car finished soon. Quote Link to comment Share on other sites More sharing options...
locodrftr Posted March 30, 2009 Author Share Posted March 30, 2009 Very busy weekend...and not in the good way... I didnt have a chance to do anymore work on the box due to the fact that my brothers honda got a busted timing belt. I never really liked honda's and now i really dont...what a pain it was to change the belt....and the water pump driven off of the timing belt??? whatever its done i finished and it runs...until next time hopefully i post some progress as oppesed to this.... Quote Link to comment Share on other sites More sharing options...
josh817 Posted March 30, 2009 Share Posted March 30, 2009 Every 100,000 the dealership tells you to replace the belt and water pump because yes, timing runs off the same belt. Quote Link to comment Share on other sites More sharing options...
gnosez Posted March 31, 2009 Share Posted March 31, 2009 I know the expense of the smaller horns can be a factor, hell I have the cheapest of the two TWM boxes and that was way too much money to spend, but you run the risk with your current set-up of A) not getting the air to flow into the last set of horns and the horns themselves blocking the flow of air. If you don't have a A/F meter installed consider one to protect your engine. It would be interesting to see the numbers with and without the horns..... Quote Link to comment Share on other sites More sharing options...
josh817 Posted April 1, 2009 Share Posted April 1, 2009 Eh I think hes going with a 3" intake, this should be good. I also do believe a 40mm carb with an airhorn flows like a 45mm, 45mm with horns like a 50mm. Then it all comes down to the venturis, the manifold ports, and the ports in the head, how crazy you get with them. Edit: From the TWM website 1.25" difference from the front to the rear of the box. I don't know much of anything about flow but to me that doesn't seem to significant, that is, compared to those RB intakes that come down to a really small area on the last cylinder. Also note this "JDM" air box that was used on 50mm Mikunis: No angle, quite similar to what he's doing actually. Link to ebay listing: http://cgi.ebay.com/ebaymotors/JDM-STAINLESS-STEEL-TRIPLE-MIKUNI-WEBER-COLD-AIR-BOX_W0QQitemZ220384176134QQcmdZViewItemQQptZRace_Car_Parts?hash=item220384176134&_trksid=p4506.c0.m245&_trkparms=72%3A1171|65%3A12|39%3A1|240%3A1318 Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted April 1, 2009 Share Posted April 1, 2009 I believe that honda is an interference engine and might have bent some valves.....depending on the model. Also.......the various front engine seals under the cover have a tendancy to just fall out so you might want to replace them as well. Quote Link to comment Share on other sites More sharing options...
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