george.bryant Posted December 26, 2005 Share Posted December 26, 2005 I got a dremel for Xmas and have a spare L20et head. I want to port the intake. What do I do? Lol, i know its a basic question but im a absolute novice really. I learn very quick and im technically minded so i reckon i'd be alright at it and would like to give it a go. Regards, George Quote Link to comment Share on other sites More sharing options...
george.bryant Posted December 26, 2005 Author Share Posted December 26, 2005 I also have a spare inlet manifold that I want to work. Suggestions??? Quote Link to comment Share on other sites More sharing options...
johnc Posted December 26, 2005 Share Posted December 26, 2005 You might want to search Amazon.com for a book on head porting before getting out the Dremel. Quote Link to comment Share on other sites More sharing options...
Mike C Posted December 27, 2005 Share Posted December 27, 2005 Like John said, several good books out there on porting in general and "How to Hot Rod and Race your Datsun" about L series specific. Forget the Dremel. Porting heads with a Dremel is like mowing a football field with a 16" trim mower... Quote Link to comment Share on other sites More sharing options...
240Z Turbo Posted December 27, 2005 Share Posted December 27, 2005 The first place to start is the spark plug holes. Use the dremel to remove all of the thread within the spark plug holes and then work your way to the valve guides with the valves removed. Once this is done use the attachment to write your name onto the deck surface. The Dremel is a powerful tool for working on a cylinder head. Quote Link to comment Share on other sites More sharing options...
george.bryant Posted December 27, 2005 Author Share Posted December 27, 2005 smartass.... Quote Link to comment Share on other sites More sharing options...
george.bryant Posted December 27, 2005 Author Share Posted December 27, 2005 I do have all the time in the world....so i wasnt worried about how long it takes. I just dont want to pay a engine shop like $200...but i guess they charge that cause of the pro job they'd do Quote Link to comment Share on other sites More sharing options...
tube80z Posted December 27, 2005 Share Posted December 27, 2005 If you're really serious about porting you might try and find Practical gas flow by John Dalton. I think it may be out of print. It details how to make molds of the head, build a basic flow bench, and various techniques. Get an old head and section to see how far you can cut before striking water. Then prepare to spend a year or so of spare time to develop a port shape that works well. Taking of sharp edges and blending mold moarks is not too hard. But trying to alter the shape of the port to flow more air across the entire lift range is not trivial. And no engine shop will port any head for $200. If they quote that for a price I wouldn't let them work on anything of mine. Cary Quote Link to comment Share on other sites More sharing options...
bjhines Posted December 27, 2005 Share Posted December 27, 2005 ok... I am a big dremel fan...but it is not appropriate for head porting... A $25 air powered die grinder with a $25 long reach carbide burr will get the metal removed quickly and in a controlled fashon... then you can use your dremel tool to smooth out the surface... although an $8 tapered roll mandrel for your air grinder will make the dremel seem absolutely useless. The thing is... once you have decided what to remove... and how you are going to approach it... you are almost done with the task... It literally takes seconds to rough cut an intake port to match a new manifold... It only takes a few minutes to smooth it out to final shape and surface... You would wear out that shiny new dremel tool before you got half the ports done... the air tool would do the entire job far faster than you could figure out what to do next. Ohh... and the most useful tool available for a dremel is a truckload of the FIBER REINFORCED CUTOFF WHEELS and a few extra mandrels for them... you can pretty much tip the box of freebie bits into the trash can...and the little red cutoff wheels go in the trash too. Quote Link to comment Share on other sites More sharing options...
george.bryant Posted December 28, 2005 Author Share Posted December 28, 2005 so..something like this http://www.trademe.co.nz/Business-farming-industry/Building-construction/Tools/Air-tools/auction-43667246.htm ?? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted December 28, 2005 Share Posted December 28, 2005 Buy a die grinder (maybe even an extended one), buy a couple of burrs, then buy a porting kit. You don't want to use stones on aluminum, they clog almost immediately. http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=39154 http://www.american-carbide.com/Burs/LSB.aspx?SubCategoryID=13&selection=4&Cat=2 http://www.sa-motorsports.com/diyport.shtm Quote Link to comment Share on other sites More sharing options...
jerret125 Posted December 28, 2005 Share Posted December 28, 2005 its easy to do your self just start by smoothing all the ports and smooth out all the casting lines. it wont give you a tone of power but for a beginner it is a start. you must go with the right burrs for cutting other wist they will clog up Quote Link to comment Share on other sites More sharing options...
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