NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   Rotary Engine Building, Porting & Swaps (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/)
-   -   Is Porting Really That Simple? (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/porting-really-simple-52108/)

rotaryrocket79 08-21-2005 07:48 PM

well, i've been doing some research on porting, and it seems like it's too easy! Are you people telling me all I have to do is pull my engine apart, buy a template and some good dremel bits and grind away? I plan to do a streetport on my 79 12a sometime in the future and was just wondering if it is just that easy.

Dramon_Killer 08-21-2005 10:49 PM

Easy as cheese.

ColinRX7 08-21-2005 11:27 PM

That's right

nismo convert 08-21-2005 11:36 PM

it's easy, but dremels are teh wrong way to do it, i would use it for clean up, they are too small to port a motor.

BDC 08-22-2005 12:04 PM

[quote name='nismo convert' date='Aug 21 2005, 08:36 PM']it's easy, but dremels are teh wrong way to do it, i would use it for clean up, they are too small to port a motor.

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Not in my opinion they're not. https://www.nopistons.com/forums/pub...IR#>/smile.png



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diabolical1 08-22-2005 12:52 PM

for me, the Dremel is enough to do the intakes. i've been having a hard time with it on the exhausts.



i should be receiving a die grinder any day now, so i'll be able to make an informed decision on how much better die grinder works on the exhausts.

mike_rudy 08-22-2005 04:53 PM

i use a die grinder to cut the ruff port on the exhuast and clean it up with a dremel, and use the dremel to do all of the intake

rotaryrocket79 08-22-2005 05:39 PM

thats good, I got a dremel and a die grinder. Thats what i wanted to hear!!

laundryhamperman 08-23-2005 05:13 PM

how much more is involved with grinding a bridge port if templates were purchased?

rotarygod 08-23-2005 09:07 PM

Grinding away metal on a housing easy. Getting the right shape, runner transition, and finish is the hard part. Templates only show you what size to open them up to. A template can't show how to do the real work that actually makes the most difference. It is possible to make a port larger and have it flow worse.



You will need a die grinder with some fairly expensive bits to do a nice cut. These generally aren't available at the hardware store. I've got some nice carbids and non ferrous bits that I use for various things. I only use a Dremel to go back and do finish work. It is possible to port an engine with only a dremel but it is also possible to cross the Atlantic in a rowboat. It's slow and difficult.


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