2 into 1 motorcycle sheet metal intake manifold

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Hey guys I have a question about clamping manifolds down and welding on them. The flanges on the intakes are 1/4 thick, I should have went 5/16 or more hopefully it won't matter. I don't have a piece of 3/8 steel to bolt it to but I do have 1/4 inch. Do you guys think that enough?the tube are 1/4 thick with machining.
Reply:Only one way to tell . . .You could also double up the 1/4" steel plate for more support.MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110Save Second Base!
Reply:what's wrong with the table? drill and bolt and it shouldn't go anywhere...There are no problems. There are only solutions. It's your duty to determine the right one.Hobart Handler 210Airco 225 Amp MSM Stinger
Reply:Originally Posted by ThorsHammerwhat's wrong with the table? drill and bolt and it shouldn't go anywhere...
Reply:Originally Posted by duaneb55Only one way to tell . . .You could also double up the 1/4" steel plate for more support.
Reply:Originally Posted by BistineauAlso, when your done with all the welding and it is still clamped/bolted in position, heat the entire assembly with a rosebud O/A torch and let it cool normally to stress relieve it, so it doesn't spring to a different position when unclamped/unbolted.
Reply:Originally Posted by motolife313I just have a propane torch. What temp do you bring it up to and how long?
Reply:I don't think I've seen AL get red hot. Are you being serious? Have you had stuff spring around after unbolting it?
Reply:Originally Posted by motolife313I don't think I've seen AL get red hot. Are you being serious? Have you had stuff spring around after unbolting it?
Reply:It's all good. I don't really think I would wanna really get it red hot if it was steel anyway.
Reply:Originally Posted by duaneb55Only one way to tell . . .You could also double up the 1/4" steel plate for more support.
Reply:geting the radius roughed in
Reply:starting to look like a manifold.
Reply:Beautiful welds.
Reply:Thanks, as long it's from the bottom of your hartLast edited by motolife313; 04-28-2015 at 01:48 AM.
Reply:Moto, what kind of bike is it going on? Seems like a cool project. If it's still bolted down tight, you might ask google about normalizing aluminum. Sent from my dumb smartphoneTeach Ag Mech - Mike At Home:Lincoln Electric AC225Miller Challenger 172Gas AxeWork:eclectic bunch of 90's vintage blue boxes
Reply:Why the big bump on the inside?Correct me if I am wrong but airflow goes much better with the radius on the inside.Look at the runners on this inside and out.http://weldingweb.com/vbb/showthread.php...ghlight=intakeIf you stand yours up.. how much water does it take to make it come out the bottom compared to what I posted?UNRESTRICTED flow is the way to go.But I could be wrong....zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Originally Posted by zapsterWhy the big bump on the inside?Correct me if I am wrong but airflow goes much better with the radius on the inside.Look at the runners on this inside and out.http://weldingweb.com/vbb/showthread.php...ghlight=intakeIf you stand yours up.. how much water does it take to make it come out the bottom compared to what I posted?UNRESTRICTED flow is the way to go.But I could be wrong....zap!
Reply:Zapster did you have your manifold on a flow bench and play with different radius to see how much different they act? I would think there's not much difference in flow between the kind of radius I have vs yours. I might throw mine on there just to check the radius but also filling the corners in inside the plenum. I want to make this plenum have a detachable lid like yours so i can play with plenum volume. I was thinking of bolting a piece of AL to the back side of the detachable plate to lower the volume. One of my machinist just puts clay on the face of the intake when flowing heads and its alot bigger then mine. He says there not much difference in flow with different size radiuses. My other machinist who were Harley prostock champs have radius plates they use with a big radius like mine.
Reply:I don't think you need a big radius but this one wont hurt flow.
Reply:Yes we have a Superflow flow bench and yes we have experimented with clay and such but only in ports on the head itself..Never in any intake...You want them as smooth as possible..We get as far inside as we can with a die grinder and smoothen out everything we can.Bumps and risers inside a intake causes turbulence and that is exactly what you do not want..Intakes are port matched to the heads and that's about it on the intake side.I am willing to get wager that if you build two of those with yours as is and one radiused inside the latter one will be much much better.You'll see....zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Originally Posted by teachagmechMoto, what kind of bike is it going on? Seems like a cool project. If it's still bolted down tight, you might ask google about normalizing aluminum. Sent from my dumb smartphone
Reply:Originally Posted by zapsterYes we have a Superflow flow bench and yes we have experimented with clay and such but only in ports on the head itself..Never in any intake...You want them as smooth as possible..We get as far inside as we can with a die grinder and smoothen out everything we can.Bumps and risers inside a intake causes turbulence and that is exactly what you do not want..Intakes are port matched to the heads and that's about it on the intake side.I am willing to get wager that if you build two of those with yours as is and one radiused inside the latter one will be much much better.You'll see....zap!
Reply:Attachment 1091181i put .300 clay in the floor and taperd it down to the short turn and it only changed the flow by 4 cfm. It went up down low by a couple. This really killed the CSA of the port and probably gained a crapload of velocity wich would make good lower end torque . But I think this port was way to small anyway so I not gona put anything in there
Reply:heres another pic. This head flowed  under 140 cfm stock now flows over 215 cfm. Still has stock valves in it still too. I'm thinking about flowing stuff with water like you were saying, with a 5 gallon buck and stop watch, I would have to make attachments on the intake port to hold a bunch of water. The bigger the bucket I fill the more accurate. Better then paying my machinist 50$ to flow a chamber. He's gives me a deal when I wanna flow it multiple times.Re read your post...Study YOUR picture...The radius is made of clay on the intake port of the HEAD...not the MANIFOLD....Manifolds should be burr and casting mark and bump free on the inside....zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:I'll add that I don't think a 750CC motorcycle engine is going to benefit much from the huge primary tubes on that plenumTeach Ag Mech - Mike At Home:Lincoln Electric AC225Miller Challenger 172Gas AxeWork:eclectic bunch of 90's vintage blue boxes
Reply:Originally Posted by teachagmechI'll add that I don't think a 750CC motorcycle engine is going to benefit much from the huge primary tubes on that plenum
Reply:Originally Posted by teachagmechI'll add that I don't think a 750CC motorcycle engine is going to benefit much from the huge primary tubes on that plenum
Reply:i lost 5 bucks anyone know where it could be?
Reply:i was using 3/32 tungsten gold to weld about half this manifold and the ball on the tungsten kept dropping and it was very frustrating I started balling the tungsten on DC-  tryed the 3/32 again today with no luck. I switched to 1/8 and turned my shade down to 9 wich was a little bright but worked much better.
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Reply:What amperage were you running to get 1.5%La to drop into the puddle. I also think you mean you're balling the electrode on DC+ as negative polarity would be standard for steel and stainless. Try scaling back the cleaning on your AC balance to 75% negative or so. Decent looking welds though for having so many problems. Sent from my dumb smartphoneTeach Ag Mech - Mike At Home:Lincoln Electric AC225Miller Challenger 172Gas AxeWork:eclectic bunch of 90's vintage blue boxes
Reply:the plenum still needs some final blending. I plan on puting on 2 small carbs in the low 20 mm and try big carbs.
Reply:Ever thought about flat slide mikuni lots of runner to suck through  might be interesting startingMiller 200Miller dial arc 250 hfLincoln welder generatorSmith o/a
Reply:Originally Posted by teachagmechWhat amperage were you running to get 1.5%La to drop into the puddle. I also think you mean you're balling the electrode on DC+ as negative polarity would be standard for steel and stainless. Try scaling back the cleaning on your AC balance to 75% negative or so. Decent looking welds though for having so many problems. Sent from my dumb smartphone
Reply:Originally Posted by large-humanEver thought about flat slide mikuni lots of runner to suck through  might be interesting starting
Reply:Originally Posted by motolife313I heard you can have the plenum as big as a house and it will still idle.