NOOB'S GUIDE TO PORTING (56K Beware)
#81
Rotary Enthusiast
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Originally Posted by GtoRx7
Haha, I meant 13btnos's port picture.
#84
NASA geek
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I agree with Ito and 13btnos. You have a good begining to a decient port, but theres tons more finishing work and grinding that needs to be done. Much MUCH back cutting of the opening edges of both the bridge port and the stock opening port. The bowl needs smoothing as does actually opening up the runner to delet the venturi all things mentioned by already. Theres TONS of info on porting here on this forum and at nopistons (A lot from Ito himself). I strongly suggest you guys read up on porting techniques and what works from masters before you go cutting up your engine bits. Its obvious theres a lot of inexperiance here (more so readers/posters then the original poster), praising newbs (no offence but I'd give it a C-, like I said a good start to a decient port) for there work. Kudos for starting this thread and A+++ for effort. This could be a great start to how to port effectively.
~Mike..............
~Mike..............
#85
Rotors still spinning
iTrader: (1)
Originally Posted by 13btnos
Flow, flow,flow it's all about the flow! You will gain more porting the runners and in the bowl area than you will in just increasing the port timing.
#87
Originally Posted by 13btnos
Flow, flow,flow it's all about the flow! You will gain more porting the runners and in the bowl area than you will in just increasing the port timing.
#88
Originally Posted by Rx7_Nut13B
I was really just saying that they are really really smooth and thus you will not be able to flow as much air. Ruffness is somewhat good.
#89
Rotary Enthusiast
iTrader: (1)
Originally Posted by Blake
That's not necessarily true. Some parts of the port should be mirror polished (laminar flow areas) and others should be slightly rough (boundary layer areas). You can read about some of this in my porting article in MazdaSport, which is available in Barnes and Noble now. I am hitting my business partner Rob hard to do a porting DVD and really show people how to do it, step by step.
Blake I just finished porting an engine using your mild streetport template. When I get a chance I'll post the picture on your thread.
#91
pistons go home!
Join Date: Sep 2006
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guys you are always talking about the importance of the "bowl"! what exactly do you mean? 'cause if i bowl the port too much on the closing side, i'm afraid to fall into the water jacket!! does nobody have any pics about this "bowl"??!!
#92
Originally Posted by airworks-fc3s
guys you are always talking about the importance of the "bowl"! what exactly do you mean? 'cause if i bowl the port too much on the closing side, i'm afraid to fall into the water jacket!! does nobody have any pics about this "bowl"??!!
#95
Rotary Enthusiast
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Originally Posted by rotarygod
I agree with that to a point. It's not only about flow but I know what you are getting at for simplicity sake. The biggest mistake people make is that they just try to go larger and larger. Flow is important but if your intake ports can flow more than your manifold can (or vice versa), it's worthless. You've now just gotten to a point where your velocity slows down. If your engine setup flows so much that you shift while your power curve is still going up, you have too much flow. More is not always better. I know what you mean as it was a generic response but it's not all about the flow. It's about flow consistency throughout the entire system and having only as much flow as you need and no more. That's what makes the most power.
#96
pistons go home!
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thanks Blake, now that was clear!
but still i'm worried, 'cause i can't exactly tell how thick the wall behind the bowl is... i'm afraid of breaking through...
but still i'm worried, 'cause i can't exactly tell how thick the wall behind the bowl is... i'm afraid of breaking through...
#97
Originally Posted by airworks-fc3s
thanks Blake, now that was clear!
but still i'm worried, 'cause i can't exactly tell how thick the wall behind the bowl is... i'm afraid of breaking through...
but still i'm worried, 'cause i can't exactly tell how thick the wall behind the bowl is... i'm afraid of breaking through...
#98
Here is the motors first startup after the porting
http://www.youtube.com/watch?v=ZY1NuGmDm5Y
No Exhuast and the turbo had some thick lube in it when i first started now it turns really easy
http://www.youtube.com/watch?v=ZY1NuGmDm5Y
No Exhuast and the turbo had some thick lube in it when i first started now it turns really easy
#100
Rotary Freak
good job. adjust ignition timing and idle and start driving it.. always keep in mind that a bridgeport has a tendency to foul up plugs and sometimes the engine will not kick over..