52 Piece Sanding Cone Set
I also use these except it's an 1/8 mandrel to fit Dremal, have to look for that size, not at HF.
I also use these except it's an 1/8 mandrel to fit Dremal, have to look for that size, not at HF.
How does my DIY porting job look?
- Thread starter wwholden
- Start date
Yeah I already have that. With 1/4 in shank. Where would I find 1/8 in shank for a dremal? And I'm looking for a store because I'd rather not wait for shipping if some known place has it.
Thanks! I'd really like to see some pics of this knifed intake bridge......
Yup, get that brick wall out of there, smooth out all the imperfections and casting marks.
Don't make it too shiny though, leave it a little roughish, fuel beads to a shiny surface.
So hit the entire intake port with some 80 grit then? And surely you don't mean completly remove the bridge. Just round it off right?
Yup, sorry I did not explain myself well.
The bridge stays, but taper it back from the bore in a triangle fashion.
Clean up the whole surface area of the input, remove any casting marks and imperfections.
You can go finer in grit, the idea is to make it really smooth, so there is nothing to hinder the air, but not to the point of polishing.
Take a trip around the forum and search for some porting pics, they will explain more than I can in words.
X 2222222 , Also check McDizzy, and watch Ken's vids again. No offense but don't think you payed attention. You want smooth trasistions, no square edges, sometimes you can be faced with a flaw you have to live with. Until you understand more don't be tempted to change port timings (raising roofs). If you can get in to remove flaws fine. Don't narrow intake bridge.
Like I mentioned, a little is a lot. Good example is I was checking port timings on Larry's shee. Putting new 4mil crank in , at nearly TDC, 2mm of piston travel is about 14* of crank rotation, which is 28* of port timing. Realize that that would change through out the stroke, point is that (roughly) applied to ex port thats the difference between decent trail port and full on drag port. It might sound like "cool, I want all the powwaa I can get" but you end up with an engine that is useless except for 300' drags.
JMHO, your results may, and will vary. I:I
Blaner
Your Friendly South African Ambassador
Thanks for the advice guys! And thanks for the pics slick! I went to harbor freight and got the 7 peice diamond cutters kit. Ill do some more work on the ports this weekend and post up some updated pics.
