garvice Posted May 22, 2009 Share Posted May 22, 2009 looking good. Try the photos without a flash, seems to work better for me. Quote Link to comment Share on other sites More sharing options...
wax Posted May 22, 2009 Author Share Posted May 22, 2009 Ok how is this Its a bit darker but you get the idea more Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted May 22, 2009 Share Posted May 22, 2009 just out of curiousity what tools did you use to port the manifold? Quote Link to comment Share on other sites More sharing options...
wax Posted May 22, 2009 Author Share Posted May 22, 2009 Im using a die grinder with a 9" shank then im using cartdrige wheels to clean up the alloy afterwards I build alot of race two stroke engines so my stock of burrs is quite big Quote Link to comment Share on other sites More sharing options...
garvice Posted May 22, 2009 Share Posted May 22, 2009 That looks a bit better. I have a bit of a technical question. When porting manifolds, do you have to try and keep the runner diameters and runner mouths/openings similar sizes across the cylinders so that each cylinder flows similar amounts of air? If so, how do you manage to do this? You mentioned ball bearings, is this your normal measuring tool? or do you have a long measuring caliper or something? Cheers mate, Brad Quote Link to comment Share on other sites More sharing options...
wax Posted May 22, 2009 Author Share Posted May 22, 2009 Yes you need to keep them the same across the cylinders, Thats the hard part is keeping them the same. No i dont normally measure with a ball bearing , but since I had some them i tried them down it. They did actually show me that the diameter down the runners was very close between them I was looking to get the diameter up to help the flow. The thing is with manifolds like this is unless you have sidedraft webers then or itbs then the flow is going to be different between them all anyway. Quote Link to comment Share on other sites More sharing options...
garvice Posted May 22, 2009 Share Posted May 22, 2009 Fair enough, thanks for the info. Quote Link to comment Share on other sites More sharing options...
wax Posted May 22, 2009 Author Share Posted May 22, 2009 Plus with a good ecu you can trim a cylinder if ones not flowing the same as the others Something like you have. A motec Quote Link to comment Share on other sites More sharing options...
wax Posted May 23, 2009 Author Share Posted May 23, 2009 Ok well more work on the manifold today its ready to get welded up now Took the egr right out of it Also removed the centre rib out of the manifold and took all the casting marks of it Quote Link to comment Share on other sites More sharing options...
islanddozer Posted May 23, 2009 Share Posted May 23, 2009 are you going to polish ? Pics look like you need to sand before you can polish. I used a dremel with a flex shaft and a flapper wheel to sand and a polish wheel and proper polish. Turned out gem Are you really planning to tig flat stockl to the cast ? Thanks for the pics and good luck on your project Quote Link to comment Share on other sites More sharing options...
wax Posted May 23, 2009 Author Share Posted May 23, 2009 No i am not going to polish it I am just getting the casting marks out of it so i can get it resandblasted to give it that sand cast finish all over, i havent finished it yet , the welding will need cleaning up , until that time im not going to hard on the finish Yes i will be welding flat stock to the cast , done it heaps before works very well Quote Link to comment Share on other sites More sharing options...
Tony D Posted May 23, 2009 Share Posted May 23, 2009 I got socks just like those! I'm wearing them now... Even the best ported stock intake manifold (at yes, 35mm diameter) will still be down on flow by about 30CFM over a properly ported intake runner. If you have your head ported, don't go real crazy---that manifold will likely flow in the 170-190cfm per runner range, so keep that in mind if you are shooting for a 'balanced equation' and want to keep velocities up in the ports. As for the question about measuring the ports---keep all those old intake and exhaust valves handy! Turning them down on a lathe and putting 'stops' on the stems allows you to make a progressively taperer runner FAR easier than eyeballing it. A little smudge of machinist's blue on the rim of the valve and dunking it down the port to a specific depth reveals high spots to be attended to, as well as insuring the taper you want is present. .5mm every 25mm runner length is hard to eyeball, but if you got some stepped gauges made from old valves. Then again, as a two-stroke man you're wondering why the hell we bothered with valves at all, right! LOL Press on... Quote Link to comment Share on other sites More sharing options...
wax Posted May 23, 2009 Author Share Posted May 23, 2009 the valve idea works well , thanks for that yeah sock are the go in the house at the moment its raining again if i average your estimation of 170-190 and use 180 then the manifold will flow 278 hp Im not sure if many l28s are getting that in N/A trim With boost it should get along just fine Im looking to make about 350 at the wheels so i think it will be enough As far as the head yeah i am just going to give it a mild cleanup to get rid of anything that impeds the flow Thanks for the heads up Oh and i used to be a car mechanice before i saw the light and went with the valveless engine hahaha Not sure what this cam thing is however i have been using it as a lever bar .Is this bad?? Quote Link to comment Share on other sites More sharing options...
garvice Posted May 23, 2009 Share Posted May 23, 2009 not sure what this cam thing is however i have been using it as a lever bar .is this bad? lol!!! Quote Link to comment Share on other sites More sharing options...
Comrade_Charlie Posted May 23, 2009 Share Posted May 23, 2009 Looks good! Not sure what this cam thing is however i have been using it as a lever bar .Is this bad?? You take pictures with it Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted May 23, 2009 Share Posted May 23, 2009 How many pairs of socks have metal splinters in them? Quote Link to comment Share on other sites More sharing options...
wax Posted May 23, 2009 Author Share Posted May 23, 2009 Ha ha ha I grind in bare feet The alloy gets stuck in the hairs on my toes Quote Link to comment Share on other sites More sharing options...
Tony D Posted May 24, 2009 Share Posted May 24, 2009 278? Probably not on that manifold as an N/A but easily supported on a turbo! But a stock ported turbo manifold with a ported head and cam on a stock bottom end (turbo) will run 300+ at 10psi of boost. The same engine terminally made 465 to the rear wheels somewhere around 20 or so psi. (JeffP's latest experiment in torture...) He knows his stock manifold costs him 30CFM over what the port flows when mated to a Cannon Manifold that was port-matched. Were he to change over to a plenum simply bolted to the Cannon Triple Manifold, and put the appropriate TB on the front, he could pick up another 30CFM per runner in flow, and undoubtedly that HP number would climb higher from the flow restriction removed. We must be on the same timezone now...I just landed in Nagoya! (Was in Shanghai) I grind naked. My wife freaked thinking I was getting 'greyhaired'...prematurely! Just remember to be careful around things that can twist other things into a knot violently! LOL Quote Link to comment Share on other sites More sharing options...
wax Posted May 24, 2009 Author Share Posted May 24, 2009 I was just working out the calculation off the cfm you posted . 170-190 cfm works out to be 278hp http://www.speedwaybids.com/calcs/powerfromcfm.html Grinding naked is not going to work for me.Cartdrige wheel to the testes is not a good look. If it turns out to be a restriction i will just make another manifold, im thinking about getting it flow tested just to see what it does flow. a friend of mine has a flow bench Quote Link to comment Share on other sites More sharing options...
garvice Posted May 24, 2009 Share Posted May 24, 2009 I grind naked. HA!!! I didn't need that mental picture. Just remember to be careful around things that can twist other things into a knot violently! And I especially didn't need that one. HA! Quote Link to comment Share on other sites More sharing options...
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