Owain1602 0 Posted May 15, 2006 I have just had a bit of time earlier to try and make a start on the port matching of my inlet manifold for the carbs. I can see now its going to take a whole lot of time, what do you guys recomend using to remove material, i am using the new dremel with the flex hose thing which up to now has really impressed me, which bits would be ideal for this job? Then how do you polish the manifold up after doing the work? Any good tips or things to watch out for? What does someone as PumaRacing use to do port work like this? I am guessing that a dremel is not high on the list of recomended tools? Share this post Link to post Share on other sites
James_R 3 Posted May 16, 2006 You want to maintain a smooth but matt finish to the manifold inside the ports to air turbulence in the flow, rather than a mirror finish, aim for a 400-600grit kinda of finish to the ports Share this post Link to post Share on other sites
Martin@PRD 0 Posted May 16, 2006 I used a die drinder with a steel carbon tree and pleanty of wd40. Share this post Link to post Share on other sites
M3Evo 0 Posted May 16, 2006 OMFG! Is that mounted on the studs in the bottom pic? It really pissed me off when companies make products to serve a specific purpose (mount carbs or TBs to an Mi16 head in this case) but end up marketing a load of s*ite which doesn't fit properly! Share this post Link to post Share on other sites
Man3 0 Posted May 16, 2006 I would think so, the mangoletsi manifolds are notoriously bad. Share this post Link to post Share on other sites
M3Evo 0 Posted May 16, 2006 And HOW much do those manifolds cost?! At least my kit lines up with the ports properly! Share this post Link to post Share on other sites
B1ack_Mi16 67 Posted May 16, 2006 And HOW much do those manifolds cost?! At least my kit lines up with the ports properly! My Jenvey Mi16 manifold also lined up very very good.... Share this post Link to post Share on other sites
Martin@PRD 0 Posted May 16, 2006 Yes, it wad on the studs....... The manifold I had was from Pugspare's the manifold was nice though your right it didnt line up properly, cost £150 Share this post Link to post Share on other sites
M3Evo 0 Posted May 16, 2006 Yes, it wad on the studs....... The manifold I had was from Pugspare's the manifold was nice though your right it didnt line up properly, cost £150 Holy crap! How difficult was it for them to get hold of an Mi16 head, measure it up, and then make something which fits as opposed to something which doesn't?! Unbelievable! The fact that you need to mod the head to get the thing to line up too just beggars belief! Take it that those were the only available manifold adaptors for the Mi16 at one point then? Share this post Link to post Share on other sites
Martin@PRD 0 Posted May 16, 2006 The manifold was 45mm all the way through, and all the grinding was on the right hand side, I was going to machine the holes to slots and centre it to the ports, but ment removing the dwel pins which I wasnt keen on that the time. It did have USA cast into it too. Wont be buying another one thats for sure. Share this post Link to post Share on other sites
M3Evo 0 Posted May 17, 2006 Aah, it being 45mm all through wouldn't help I guess, but then they should've known the port entrances are only 40mm! Share this post Link to post Share on other sites
petert 588 Posted May 17, 2006 (edited) I'm not sure if it's just the angle in Martin's picture, but there appears to be a very abrupt change in diameter just inside the flange. I'm certainly not a flow expert, but I was taught that at no point should the change exceed 6 degrees. Here's a pic. of mine. It's a cut down Mi16 manifold fitted with 48mm DCOE flanges. Roughed out with a carbide burr, then finished with an #80 grit flap wheel. It's certianly not perfect and needs a bit more work. Edited May 17, 2006 by petert Share this post Link to post Share on other sites
Martin@PRD 0 Posted May 17, 2006 Aah, it being 45mm all through wouldn't help I guess, but then they should've known the port entrances are only 40mm! Would of bin perfect if it lined up center with ports 2.5mm removed from the lower part of the port and blended in with throat would of been nice with big valves. I'm not sure if it's just the angle in Martin's picture, but there appears to be a very abrupt change in diameter just inside the flange. I'm certainly not a flow expert, but I was taught that at no point should the change exceed 6 degrees. Here's a pic. of mine. It's a cut down Mi16 manifold fitted with 48mm DCOE flanges. Roughed out with a carbide burr, then finished with an #80 grit flap wheel. It's certianly not perfect and needs a bit more work. Just the photo angle peter, Well i carnt see the join nice work, can just make out the MI16 manifold in the background. hope you aint got pins and needles from white finger vibration like i did Share this post Link to post Share on other sites
