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well i am just starting to port my housings and irons.... ok so one of my rotor housings has allready been ported... so i am porting the other to roughly the same size and smoothing up the ported one because it isnt that good...
heres some side by side for the stock port, and then the ported housing i have. stock port s5t2 Attachment 20494 FD pre-ported housing by someone i dont know Attachment 20495 now here is my practice porting on a destroyed s5 housing Attachment 20496 i basicly ported out to match the sleeve, so i ported out to the left , right and down on the bottom, the bottom of the port is angled down very slightly..... and for the top i ported at an angle upward so as not to raise the roof of the port by much at all.... now i only had a 110volt drill and some large bits, so i cant smooth it out very well... i am getting a dremel and some smooth bits to smooth things out and tapper the edges so as not to catch apex seals https://www.nopistons.com/forums/pub...IR#>/smile.png im not sure if the shape of the port is correct?? does it look like i am doing this right?? this is for a street ported motor i am using the RB templates for intake ports... im gonna start those after i finish the exhaust porting |
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heres one of my housings that was allready ported i polished it up and straightend it out a lil bit
Attachment 20488 Attachment 20489 does this look ok?? , its kinda weird the housing is sort of cloudy this was from a car that had really bad oil control rings... seems smooth and shiny though... |
The cleanup looks much better than the initial. I recommend not going any larger. I think one mistake some people make who endeavour to port exhaust ports is to open the port too early. Everything has to be taken into account. And, while we can make an exhaust port that will pass an oversized lemon through it, will it necessarily be condusive to a good-running engine making alot of power under reasonable load? Probably not. The earlier the port opens, the lesser the time for a power stroke. Keep this in mind. The later it closes, the more overlap is induced (which can be a very, very good thing). The wider the port is made, the less support for the apex seal and theoretically the greater the chance for it to 'banana' itself out in the middle.
My take on exhaust ports is to make them marginally larger but not to the point of decreasing any particular structural integrity of the apex seal as it passes over nor reducing the power stroke by opening the port too early. I'm not a fan of 'bigger is better'; I'm more about keeping velocities up, be them charge or exhaust. Check out my exhaust ports; you'll see that I put my focus into going very, very smooth on the port and the sleeve. The exhaust port doesn't need to be gigantor for it to work well. B |
Originally Posted by BDC' post='835469' date='Sep 2 2006, 11:30 AM
The cleanup looks much better than the initial. I recommend not going any larger. I think one mistake some people make who endeavour to port exhaust ports is to open the port too early. Everything has to be taken into account. And, while we can make an exhaust port that will pass an oversized lemon through it, will it necessarily be condusive to a good-running engine making alot of power under reasonable load? Probably not. The earlier the port opens, the lesser the time for a power stroke. Keep this in mind. The later it closes, the more overlap is induced (which can be a very, very good thing). The wider the port is made, the less support for the apex seal and theoretically the greater the chance for it to 'banana' itself out in the middle. My take on exhaust ports is to make them marginally larger but not to the point of decreasing any particular structural integrity of the apex seal as it passes over nor reducing the power stroke by opening the port too early. I'm not a fan of 'bigger is better'; I'm more about keeping velocities up, be them charge or exhaust. Check out my exhaust ports; you'll see that I put my focus into going very, very smooth on the port and the sleeve. The exhaust port doesn't need to be gigantor for it to work well. B i completely agree with every thing you are saying EXCEPT the overlap, while it can be very good it can also be very bad, just needed to put out there that more overlap is not always better. https://www.nopistons.com/forums/pub...#>/biggrin.png |
hey what kind of bits do you use for finall smoothing and finishing?? i dont have very many so i cant get the stuff very smooth it seems.....
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