JustinOlson Posted August 11, 2008 Author Share Posted August 11, 2008 Here is what I'm building for my L28 manifold. I wasn't unable to source a thick walled (0.125") bends for the leading edge of the plenum. I've used straight tubing instead. You can source the hemisphere for the end of the plenum from here: http://www.sharpeproducts.com/ball_hemispheres.htm Regards, Justin Link to comment Share on other sites More sharing options...
Slow_Old_Car Posted August 12, 2008 Share Posted August 12, 2008 anyone actually ordered one of those to know what the wall thickness is of it though? Link to comment Share on other sites More sharing options...
JustinOlson Posted August 12, 2008 Author Share Posted August 12, 2008 anyone actually ordered one of those to know what the wall thickness is of it though? I have the 3" and 4" versions here. They measure ~0.13" wall thickness. Just fine for a plenum made out of 0.125" wall aluminum. Justin Link to comment Share on other sites More sharing options...
JustinOlson Posted August 12, 2008 Author Share Posted August 12, 2008 MONZTER ran the above manifold in COSMOSFloWorks for me. Huge thanks to him for taking the time to run my design!!! It takes a lot of computing time to run these. I really appreciate it. I'm going to take some time and try and figure out what I should change based on these results. Pressure: Velocity: Regards, Justin Link to comment Share on other sites More sharing options...
luvemfast Posted August 12, 2008 Share Posted August 12, 2008 What values did MONZTER use to caculate? Turbo or NA? Here is what I found with a NA L28 @ 4000rpm. I also modelled up the Q45 throttle body. Link to comment Share on other sites More sharing options...
JustinOlson Posted August 13, 2008 Author Share Posted August 13, 2008 The manifold was run at 25" h20 I believe. I'm working on an alternative design using large radius thick walled mandrel bends. Justin Link to comment Share on other sites More sharing options...
kj280z Posted August 14, 2008 Share Posted August 14, 2008 I like it!!! If you settle on a design and would like to sell the precut peices I'd take 2 sets!! I'll weld them up asap!!! Link to comment Share on other sites More sharing options...
MONZTER Posted August 14, 2008 Share Posted August 14, 2008 The manifold was run at 25" h20 I believe. I'm working on an alternative design using large radius thick walled mandrel bends. Justin Yep, for now just ran it 25" all runners one time. Once we get this pretty close we will run it again one runner at a time. (takes 6 times as long) and then under boost, (18psi) and somewhere around 700cfm. or whatever Justin wants it run at Step by step. Link to comment Share on other sites More sharing options...
Slow_Old_Car Posted August 14, 2008 Share Posted August 14, 2008 I like it!!! If you settle on a design and would like to sell the precut peices I'd take 2 sets!! I'll weld them up asap!!! likewise Link to comment Share on other sites More sharing options...
JustinOlson Posted August 14, 2008 Author Share Posted August 14, 2008 I'll just tell you guys straight out what the second design is made from: 48" CLR radius 3" mandrel bend 11 ga wall thickness (30 degree bend): http://www.globaltecheng.com/ProductCart/pc/viewPrd.asp?idcategory=65&idproduct=713 & 12" CLR 3" mandrel bend 11ga( 30degree bend) http://www.globaltecheng.com/ProductCart/pc/viewPrd.asp?idcategory=65&idproduct=689 & Sharpe Products 3" Aluminum Hemisphere http://www.thomasregister.com/olc/smartcat.aspx?az=73226961&advancedsearch=yes&bgcolor=FFFFFF&border=0&bordercolor=000000&cartlink=yes&columnsort=yes&counters=yes&email=yes&font=Arial%2c+Helvetica&fontsize=2&iwidth=200&linktext=Back&listsort=yes&orderimage=http%3a%2f%2fwww.thomasregister.com%2folc%2fccc%2fmm%2fcec_AddToCart_f01.gif&printpreview=yes&ptnolink=yes&rfqimage=http%3a%2f%2fwww.thomasregister.com%2folc%2fccc%2fmm%2fcec_AddToRFQ_f01.gif&show=part_number+part_name+Dia+unit_price&showdiscounts=no&stripecolor=B7C0BD&tablealign=left&tablewidth=99%25&textcolor=000000&type=details_order&rn=503144&template=http://www.sharpeproducts.com/temp.htm & 0.125" 6061 sheet metal & 3/4" 3" 11GA Aluminum tubing. Regards, Justin Link to comment Share on other sites More sharing options...
JustinOlson Posted August 14, 2008 Author Share Posted August 14, 2008 Some interesting results on this plenum shape used on my coming 2JZ: http://forums.hybridz.org/showpost.php?p=922376&postcount=11 Justin Link to comment Share on other sites More sharing options...
kj280z Posted August 15, 2008 Share Posted August 15, 2008 lookin great!!! Justin... do you have a good source for the 0.125" 6061 sheet metal & 3/4" 3" 11GA Aluminum tubing? I'm about to order the rest... I couldn't find that stuff on either of those 2 websites Link to comment Share on other sites More sharing options...
JustinOlson Posted August 15, 2008 Author Share Posted August 15, 2008 I can mail you the little big of 3" tubing you'd need to space up the end. For the flat sheet, you can find it online at onlinemetals.com or a number of other places. I just get it locally from my sheetmetal shop. Regards, Justin lookin great!!! Justin... do you have a good source for the 0.125" 6061 sheet metal & 3/4" 3" 11GA Aluminum tubing? I'm about to order the rest... I couldn't find that stuff on either of those 2 websites Link to comment Share on other sites More sharing options...
kj280z Posted August 15, 2008 Share Posted August 15, 2008 I ordered the bends, and have been looking for the tubing and sheet aluminum... so far I can only find large peices or 20 foot sections of tubing... One quick question... I can visualize how all of the peices go together with the exception of the hemisphere peice.... where does that go? Couldn't we make the end by cutting a section out of a 90 degree mandrel bend? Link to comment Share on other sites More sharing options...
JustinOlson Posted August 15, 2008 Author Share Posted August 15, 2008 I have 4 feet of the 3" 11GA tubing here. I can cut you off a couple inches and send it in the mail if you cover postage. The hemisphere goes on the end. It is cut in half so you use a 1/4 of a sphere essentially. I guess you could use a 90degree bend but I have not seen them in a tight enough radius with 0.125" wall thickness. Justin I ordered the bends, and have been looking for the tubing and sheet aluminum... so far I can only find large peices or 20 foot sections of tubing... One quick question... I can visualize how all of the peices go together with the exception of the hemisphere peice.... where does that go? Couldn't we make the end by cutting a section out of a 90 degree mandrel bend? Link to comment Share on other sites More sharing options...
kj280z Posted August 15, 2008 Share Posted August 15, 2008 ok... couple more questions... The site that is listed to purchase the hemisphere's requires a $25 minimum... The hemispheres are listed as $5 each... I can order 5 or more if people need them... Let me know and I'll wait to order them until I hear back from everyone... I don't mind shipping them if people need a few... Last question... With your flow analysis, what length runners have yieded the best results? I seem to remember that 6" runners on previous manifolds seemed to be a good "happy medium" and resulted in fairly good low end torque with good HP numbers Do we have a source for the material for the runners? Both of my manifolds will be used on turbo motors... Jason... as far as your offer on the tubing, that sounds good.... maybe we can do a swap if I order the hemispheres? Link to comment Share on other sites More sharing options...
Slow_Old_Car Posted August 15, 2008 Share Posted August 15, 2008 I ordered in 12 hemispheres myself, figured couldn't hurt to have a few spares for some other projects i've been working on. Link to comment Share on other sites More sharing options...
JustinOlson Posted August 15, 2008 Author Share Posted August 15, 2008 I ordered a little over $25 work of hemispheres and they doubles my ordered some how. So now I have a bunch of them sitting here for various projects. I cut my runners tubes to 5.5". I used ross machine racing for the runner tubing. Maybe someone else has a better source. Justin Link to comment Share on other sites More sharing options...
kj280z Posted August 15, 2008 Share Posted August 15, 2008 I ordered a little over $25 work of hemispheres and they doubles my ordered some how. So now I have a bunch of them sitting here for various projects. I cut my runners tubes to 5.5". I used ross machine racing for the runner tubing. Maybe someone else has a better source. Justin Well I'd buy a few hemispere's from you if that be ok? and while we're at it if you would include the other tubing I'd be happy to pay you for it as well. Is this the runner tubing that you purchased? http://www.rossmachineracing.com/175tube.html I'm wondering if there's an effective way to test for the optimal runner length? Looking at Thagards manifold from the previous bunch that he made I seem to remember the runners were 6 inches. Rick has some dyno numbers on it somewhere... Link to comment Share on other sites More sharing options...
JustinOlson Posted August 15, 2008 Author Share Posted August 15, 2008 Sounds good on the hemispheres. I'll cut that piece of tubing tomorrow I think and get this boxed up. That is the tubing I ordered. If you cut the tubing to 5.5", the total runner length becomes ~6" due to the slip fit in the head flange and plenum base. I'm not so sure on the calculations for runner length and peak torque. I'll look into it more today. There is a helm holtz frequency if I remember correctly that determines the proper length from the velocity stack to the intake valve. Justin Link to comment Share on other sites More sharing options...
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