NEW FEATURE: Post Like system!!!

At long last, we have successfully implemented a comprehensive post rating/like system. With casual readers and visitors vastly outnumbering frequent posters, it is not always apparent to users that others are reading, enjoying and grateful for their posts. If you are too shy to post and want to express your thanks, now you can!

Liking a post is easy - click this thumbs up in the top right hand corner of the post: Image

Can I encourage everyone to use this new feature enthusiastically and liberally and be sure to go back to your favourite old topics and like old posts. This will help build up useful user 'like' profiles and give credit to the users who has provided so much value to this community. This in turn helps guests and newcomers sort useful answers and posters from others.

This goes to regular forum lurkers especially - please show your appreciation with a 'like'!

Featuring:
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  • You can remove a like if you made a mistake by clicking the undo button where the thumbs up used to sit (but the user will be notified)
  • Plus more


Read the announcement and post any queries, comments or suggestions HERE

Once read, this announcement can be dismissed by clicking on the 'X' in the top right hand corner.

Everything You'd want to know about Porting on a Rotary

A library of especially useful topics taken from Tech Talk.

Moderators: KillerRx4, orx626

Forum rules
This forum is intended as a library of some of the really useful topics from Tech Talk. When the admin spot a topic that they think is worthy of saving they will move it into this forum.

Within this forum regular users will not be able to post new topics. You will be able to reply to a topic that has been placed in here, so you can continue the discussion to add further information or ask questions.
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brown hornet
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Re: Everything You'd want to know about Porting on a Rotary

#241 Post by brown hornet » Tue May 07, 2013 9:03 pm

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..
pineapple race extend comparison 2.jpg


My RX7's - ..
The new one - not so stock anymore S3 - http://ausrotary.com/viewtopic.php?f=21&t=223532" onclick="window.open(this.href);return false;
The old one - DIY 13b 6 port turbo - http://ausrotary.com/viewtopic.php?f=21 ... &start=100" onclick="window.open(this.href);return false;

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Re: Everything You'd want to know about Porting on a Rotary

#242 Post by drtool » Sat Nov 23, 2013 9:20 am

.


1971 RX2 coupe 12A TD
1971 RX2 coupe 13B BP
1995 20B Cosmo Type SX

Trader feedback here: http://ausrotary.com/viewtopic.php?f=14 ... 2#p2707662" onclick="window.open(this.href);return false;

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Re: Everything You'd want to know about Porting on a Rotary

#243 Post by BloodyKiwi » Tue Mar 03, 2015 8:44 pm

Any info on 6 ports? I have one I want to tickle but not finding much info on these. :stupid:



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Re: Everything You'd want to know about Porting on a Rotary

#244 Post by RX7_BEN » Tue Jun 27, 2017 9:13 pm

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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Re: Everything You'd want to know about Porting on a Rotary

#245 Post by qfiebay » Thu Jun 29, 2017 7:37 pm

Awesome read :bow:



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Re: Everything You'd want to know about Porting on a Rotary

#246 Post by bumpstart » Fri Sep 08, 2017 8:29 pm

Image

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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


when the going is hard, don't retard, remember your lubrication
27 years of rotary DIY
tech forum is for tech questions.. private message box is for private messages
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Re: Everything You'd want to know about Porting on a Rotary

#247 Post by RX7_BEN » Fri Sep 08, 2017 8:34 pm

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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Re: Everything You'd want to know about Porting on a Rotary

#248 Post by pknoutrx2 » Fri Sep 22, 2017 10:35 pm

Hey Ben
Did you end up doing the intake as you marked out above?



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Re: Everything You'd want to know about Porting on a Rotary

#249 Post by RX7_BEN » Wed Sep 27, 2017 10:31 pm

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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