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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Tue May 07, 2013 10:03 pm 
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Epitrochoid Shaped Head

Joined: Fri Mar 28, 2008 2:47 pm
Posts: 1632
Location: Cairns FNQ
so i got soem pineapple racing "race extend port templates'

overlayed them on my own backyard extend port which was purely based on seal traces and what i thought was a good shaped port..

very surprised that there is next to no difference in the width and the top shape.. only the bottom section is extended lower which i didn't do...
obviously the pineapple port is widened exactly the same as what i decided on which i think was 2mm.

pic of overlay..
Attachment:
pineapple race extend comparison 2.jpg
pineapple race extend comparison 2.jpg [ 139.18 KiB | Viewed 6959 times ]

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Sat Nov 23, 2013 9:20 am 
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Rebuild Time
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Posts: 1025
Location: UK (ex NZ)
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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Tue Mar 03, 2015 8:44 pm 
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Joined: Fri Jun 27, 2014 12:49 pm
Posts: 1
Any info on 6 ports? I have one I want to tickle but not finding much info on these. :stupid:


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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Tue Jun 27, 2017 10:13 pm 
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Rotor Junkie
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Joined: Sat Dec 04, 2004 11:16 am
Posts: 5559
Location: Geelong
Hey guys, got some questions about exhaust porting for a turbo application

I'm building a 12a turbo motor at the moment using all n/a parts. The engine was initially built as a naturally aspirated extend port, so the exhaust port has been ported upwards as is commonplace for such engines. It's a typical round port with slightly squared bottom, but I'm thinking about making a few changes, mainly because I'd like the engine to come on boost a little quicker and figure while it's apart I may as well attack it.

If I understand correctly, exhaust ports for turbo engines these days are squared off and ported down (earlier port open time) in order to maximise port area whilst minimising overlap.

What I've been thinking is that I'd like to widen my existing ports a little, squaring them off and opening them earlier by porting downward. Is this going to be feasible with my already later closing ports?
I'm also limited by the rather small 12a n/a exhaust port baffles, so not a huge amount of material is going to be removed.

Pic of current ports
Image

As a side note, this is the inlet port I'm working with. The scribe mark indicates the shape I'm considering changing it to.
Image

I've been running the engine for a few years on 14psi with a T04z 1.0 split pulse rear and it doesn't make full boost until around 6000rpm.
Any thoughts on these proposed changes would be great!

Edit: Oh, here's a bit of an example of the modern age turbo type ports I'm talking about. This is on a 13b by Defined Autoworks, so won't be that large, but along those lines.
Image

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Thu Jun 29, 2017 8:37 pm 
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Joined: Mon May 29, 2017 7:43 pm
Posts: 4
Awesome read :bow:


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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Fri Sep 08, 2017 9:29 pm 
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Uber Post Whore
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Joined: Tue Jun 06, 2006 12:43 am
Posts: 11621
Location: uranus
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here is one i fixed up over the original bridge .
i have pinned it. filled it with belzona. had a new inner groove machined
and given it a moderate monster J that is common ground on all plates , similar in dimensions to the old photo above

handmade viton water seals

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Fri Sep 08, 2017 9:34 pm 
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Rotor Junkie
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Joined: Sat Dec 04, 2004 11:16 am
Posts: 5559
Location: Geelong
I like the new inner groove that's been machined.

This is what I ended up doing with my 12a housings if it's of any interest.

Image

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Fri Sep 22, 2017 11:35 pm 
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The Bug Has Bitten

Joined: Tue Jul 17, 2007 9:58 pm
Posts: 263
Location: In-Continent
Hey Ben
Did you end up doing the intake as you marked out above?


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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Wed Sep 27, 2017 11:31 pm 
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Rotor Junkie
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Location: Geelong
Nah I didn't, but I did modify the closing edge of the port a little to eliminate side seal issues. I can't find a picture at the moment.

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