Roman Posted March 30, 2022 Author Share Posted March 30, 2022 Bore size at the head is a 45x53mm slightly oval shape. Yeah there are zillions of options, these ones which suit a 1500 motor are from a 1000cc bike motor (as generally bore is wider and stroke shorter on a sports bike) So you'll probably want to find something with about 600cc engine size. There's a list of some here: https://www.msextra.com/forums/viewtopic.php?t=6602 There's a list here, but best is to just hop on ebay and have a look. It's just dificult to find the right category to search, because bike people seem to call ITB manifolds all sorts of different things! But once you get onto the right category it usually shows up similar from other bikes. I wonder if these would be alright @yoeddynzhttps://www.ebay.com/itm/283051120678?_trkparms=amclksrc%3DITM%26aid%3D1110018%26algo%3DHOMESPLICE.COMPLISTINGS%26ao%3D1%26asc%3D20210609144404%26meid%3D5f09052c980c409883c1d8e5739930f8%26pid%3D101196%26rk%3D9%26rkt%3D12%26sd%3D383944603492%26itm%3D283051120678%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DItemStripV101HighAdFeeWithCompV3Ranker&_trksid=p2047675.c101196.m2219&amdata=cksum%3A2830511206785f09052c980c409883c1d8e5739930f8|enc%3AAQAGAAACABJgNKpRsHfoti1oFo0Xiv0OLQEsNaf2pDClQ5xGlr1ay%2BCDvigRn2sbqNrfb%2BcKjmASx6fZD38FBOOzwa5CvpeHprm766T3UC8l9g1st5YvGQvO94XVFc9pBzLTJ6ApeH1TLUBAnDPKnzUTb0h0rZvFXrtouruquDC8re21koSLny5m3XTId0gSth2m65Fi7p0pZJacNkGU925SX1ZfZGDq%2FiFR%2BPePzSoc%2BYsT35bMNmtf14HfoAqiRMyRRWfJKAxy5s%2FGrb1yXEakyZznZoeFi6B08iUEb83estr4lq4FPt%2Fx0XAVqFjEUuRcf2DFw%2BUr9beP%2FpoW4oLKKYwCkABGbZx%2F0A65E3ee%2Fa0mZC16gUP32%2BJAK2cnfoCzcPxUgSUGanRDjo9gzxvf%2FmA15DjsfuQqeTXL6WhznGBL2dQ4mpxddrwphQka99IXbNtEeIpmc6sZUByXzyHK0beYFZKcCw1ibTPDGdKYd22CjHob2lb7lqZPX72%2BLFa%2Frue7unSedLkPC%2B3nT5TNYae1myYfuY0Z%2ByxW64y%2BkGRE8SVrE%2F1prt8evSql8DmbwJ2DYDKf9Qk%2BYhpY81iPzaOhOIeUz7c8QfrIXJWEnLp5t78sNFQNls32n6%2BEj%2FgMuJokdz98%2FTfP039aWunjbP%2Fy62obAW87jeaOVcAakBB9f0Ue|ampid%3APL_CLK|clp%3A2047675 1 Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted March 31, 2022 Share Posted March 31, 2022 On 30/03/2022 at 12:01, tortron said: 2nd injector for methanol? Fogger nozzles......... 2 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted April 2, 2022 Author Popular Post Share Posted April 2, 2022 I'm getting pretty close to being finished. For starters I'll try a completely straight trumpet setup, this does mean it'll be considerably shorter than before. Will be interesting to see how the powerband changes. Will try a few different lengths. It's a bit annoying how the trumpets mount, there's only two bolt holes to connect anything to, which are a the far ends in this pic. So I've printed the trumpets in pairs, with slightly undersized inside diameter. Then since this pic I've warmed them with a heat gun and pressed them on. They're on there pretty good. Hopefully not too good, as these arent the final versions yet haha. There's probably another day or two of mucking around until I can start the motor, but it's coming along. 31 2 Quote Link to comment Share on other sites More sharing options...
shrike Posted April 2, 2022 Share Posted April 2, 2022 Anyway to add another anchor point? Like have a tab that connects to the bolts that hold the two half's together? Alternatively long term you could look to get mounting plates/tabs etc welded on right? 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted April 2, 2022 Author Share Posted April 2, 2022 Longer term I'll probably have some sort of airbox or backing plate on there. Since these throttles are a bit shorter than the 4AGE stuff, I've got heaps more room for an airbox and trumpets which is nice. So to get to the same effective length I can potentially have less of a sharp bend in the runners. 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted April 3, 2022 Author Popular Post Share Posted April 3, 2022 New colour scheme. Pretty sweet I reckon, an improvement at least. I've discovered something interesting / annoying. A while back, my existing 4AGE ITB manifold which I've run for months and months and months without issues. Randomly started to foam up inside and melted. I figured this was from a time when the engine overheated. However on my new manifold, yesterday I had some fuel spill on it when I was taking the rail off. When I removed it from the head, it was slightly sludgy on the flange side where the plastic is exposed. So the fuel is melting it! So I figure this must be from something that's currently in the Gull fuel and not the others. So I completely drained the tank, and also went to get a sample from Mobil to test. I left a line of HIPS filament sitting in both fuel samples, and almost instantly you could see the filament starting to fizz up. After about 3 hours they were both just a pile of goo. Which is interesting because I've done this test previously, and the filament has just stayed 100% impervious when sitting in petrol for months on end. So the fuel suppliers must have changed the recipe. Either they have included D-Limonene, or something chemically similar. So that's a ball buster. My days of shitty/cheap printed HIPS manifolds are over! I recently bought a roll of ASA, which is like a modern replacement for ABS so I'll try again with this. It's slightly more expensive but nothing in comparison to the cost of the carbon nylon filaments. (Which is probably the correct material for this application) Hopefully by the end of tomorrow I'll be able to start the motor up again. Also I've just realized that an easy way to hold the trumpets in place will be something as simple as a cable tie around the bridge in between the pairs, then use the bolt up in the corner. Sorted. I'm running perilously low on time to get everything finished and tested though. 18 2 1 Quote Link to comment Share on other sites More sharing options...
Valiant Posted April 3, 2022 Share Posted April 3, 2022 Please 3d print a new exhaust soon. The suspense is killing me. 4 5 Quote Link to comment Share on other sites More sharing options...
deankdx Posted April 3, 2022 Share Posted April 3, 2022 10 minutes ago, Roman said: I left a line of HIPS filament sitting in both fuel samples, and almost instantly you could see the filament starting to fizz up. After about 3 hours they were both just a pile of goo. is there a paint or coating you can do that will be risk free(to the engine) and still be fuel safe protecting the plastic? 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted April 3, 2022 Author Share Posted April 3, 2022 11 minutes ago, Valiant said: Please 3d print a new exhaust soon. The suspense is killing me. Yeah I hear you. I had money set aside this month for exhaust bits, but then it was taken up by some other dumb stuff that wasnt car related. Maybe I can sell some more carina parts... Also I've only got until Mid May for attending any events in this that require WOF/REG. As it's unlikely I'll get another one without a cert. Will probably go down that path because this car's proven to be heaps of fun. And yeah anywhere that's covered by carbon or epoxy is fine, it's just if the plastic is exposed directly. So worst case scenario I'll just doubly make sure this one's entirely coated. This petrol also ate through the enamel paint on my engine cover. So it probably is D-Limonene as they use it as a paint stripper as well. 3 1 Quote Link to comment Share on other sites More sharing options...
tortron Posted April 3, 2022 Share Posted April 3, 2022 1 Quote Link to comment Share on other sites More sharing options...
Nominal Posted April 3, 2022 Share Posted April 3, 2022 Glyptal. $121 / qt and out of stock. Glyptal (restosupplies.co.nz) 3 Quote Link to comment Share on other sites More sharing options...
tortron Posted April 3, 2022 Share Posted April 3, 2022 this stuff even comes in different colours https://caswellplating.com/epoxy-gas-tank-sealer.html seems to set hard like plastic (says can also be used to pot electronics etc) 1 Quote Link to comment Share on other sites More sharing options...
GARDRB Posted April 3, 2022 Share Posted April 3, 2022 On 30/03/2022 at 11:51, Roman said: Good to see you've worked out the modern Dell'orto and lumpy cam setup for your modern starlet 4 1 2 Quote Link to comment Share on other sites More sharing options...
~Slideways~ Posted April 3, 2022 Share Posted April 3, 2022 I might have missed it, but have you looked at Carbon Nylon instead of HIPS? I've recently got the bits to upgrade my 3d printer to be able to print my ITB manifold with it. Might be a better option? It was about $100 for the filement so not too bad. Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted April 4, 2022 Author Popular Post Share Posted April 4, 2022 1 hour ago, GARDRB said: Good to see you've worked out the modern Dell'orto and lumpy cam setup for your modern starlet 3/4 race cam 48mm dellortos 13" wheels steel bumpers (under the plastic) equivilent of a 5k and T50 swap Can confirm this car is oldschool as fuck 8 3 Quote Link to comment Share on other sites More sharing options...
Popular Post Roman Posted April 4, 2022 Author Popular Post Share Posted April 4, 2022 Alright so I got this all together and have chucked together a preliminary tune (just fixing fuel table) The shorter runners have given some wins and losses, but the wins are where I would like wins to be ie high rpm I will redo the variable valve timing and then see where we are at! It drives absolutely wonderfully and it makes an absolute racket. Super fizz mode for drags now. 13 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted April 4, 2022 Author Share Posted April 4, 2022 1 hour ago, ~Slideways~ said: I might have missed it, but have you looked at Carbon Nylon instead of HIPS? I've recently got the bits to upgrade my 3d printer to be able to print my ITB manifold with it. Might be a better option? It was about $100 for the filement so not too bad. Yeah you're right it's the correct material for it. I've just been trying to resist ever using it because of the admin work of printing it (needing to prebake it, then keep it dry while you're printing) Even while you are printing a part, completely dried out nylon can absorb enough moisture from the air to make the end of your print a mess. So you really need one of those dehumidifier boxes to keep the spool in while you print. Quote Link to comment Share on other sites More sharing options...
~Slideways~ Posted April 4, 2022 Share Posted April 4, 2022 57 minutes ago, Roman said: Yeah you're right it's the correct material for it. I've just been trying to resist ever using it because of the admin work of printing it (needing to prebake it, then keep it dry while you're printing) Even while you are printing a part, completely dried out nylon can absorb enough moisture from the air to make the end of your print a mess. So you really need one of those dehumidifier boxes to keep the spool in while you print. I haven't tried it yet but I bought an eSun dry box thing to try fix that. Even my PLA is showing signs of absorbing moisture so prints have come out messy so I think it's the best way to do it. Have you looked at Making for Motorsport on youtube? He did quite a bit of heat testing on Carbon Nylon and even printed it using a basic Ender 3 with a knock off metal hot end. EDIT: and I think he also did tests with fuel but not sure if Ethanol based etc. 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted April 4, 2022 Author Share Posted April 4, 2022 I've got a carbon nylon manifold and set of trumpets here that @NicT printed a while back for beams motor. Really nice surface finish, I love the texture and feel of it. Yeah I really should just bite the bullet and set it up some time. I'll look into getting one of those drying boxes. There's a bit of variation of quality of the brands of nylon filaments though, and it can make printing anywhere from pleasant to awful. I remember Nic gave me part of a roll to test to see if I could get it to work, one that had 20% carbon in it. But yeah it was gross. I also remember him saying that the Esun filament has styrene in it (which makes it stink / cancer awfulness like ABS) It probably pays to just go straight to getting $$ass reamed$$ and buying some of the mark forge filament. 1 Quote Link to comment Share on other sites More sharing options...
ajg193 Posted April 4, 2022 Share Posted April 4, 2022 Can always just get a big pile of desiccant instead of a dehumidifying machine 1 Quote Link to comment Share on other sites More sharing options...
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