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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Fri Oct 21, 2011 4:23 am 
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exhaust port has been addressed , i'm asking how the intake ports look because in that particular engine I have found one broken apex seal and a few rounded tip side seal.

http://imageshack.us/photo/my-images/847/dscn0570n.jpg/

and yes the secondary port is almost stock not much done to it, where is the side seal hitting?

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Fri Oct 21, 2011 6:17 pm 
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Ive seen that before in a motor. Was caused by detonation I believe. you should get your rotors clearanced before you put the thing back together. They have polished the side plate a little where they have been contacting at high rpm. Id get them lapped too.


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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Sun Nov 27, 2011 7:39 pm 
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hey guys, ive started some exhaust porting on a spare s4t motor for the first time and was just wondering if i bin the sleves or give them a grind and leave them in, car will be for street use if that makes any difference, any info would be greatfull thanks


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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Wed Dec 28, 2011 11:31 am 
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G'day Guys,
Just a quick question, what is the maximum you can machine out the Bridge opening from the inner seal edge?
I notice the main measurement talked about is the 11cm from the inner water seal to the primary port edge, just wanting to know how large the hole can be before it's going to cause issues with the seal? so in other words the other measurement on the other side of the bridge to the inner water seal. I would post a pic of what i'm talking about but not to sure how to do it?
Thanks


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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Thu Dec 29, 2011 10:13 pm 
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there is definately some good advice on this topic given nice work
dave

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Fri Dec 30, 2011 10:17 am 
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RX2 COUPE wrote:
G'day Guys,
Just a quick question, what is the maximum you can machine out the Bridge opening from the inner seal edge?
I notice the main measurement talked about is the 11cm from the inner water seal to the primary port edge, just wanting to know how large the hole can be before it's going to cause issues with the seal? so in other words the other measurement on the other side of the bridge to the inner water seal. I would post a pic of what i'm talking about but not to sure how to do it?
Thanks


About what you see in the ported bridge pics earlier in the the thread for intake..they would work well..its about shape for good flow ,not port size extreames..look at high horsepower bridge turbo port plate, its all about positioning, shape and flow of ports

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Fri Dec 30, 2011 9:36 pm 
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RX2 COUPE wrote:
G'day Guys,
Just a quick question, what is the maximum you can machine out the Bridge opening from the inner seal edge?
I notice the main measurement talked about is the 11cm from the inner water seal to the primary port edge, just wanting to know how large the hole can be before it's going to cause issues with the seal? so in other words the other measurement on the other side of the bridge to the inner water seal. I would post a pic of what i'm talking about but not to sure how to do it?
Thanks

the problem with this measurement is that the datum inner edge of the water seal moves between housing generations and even for batches
for the rx4 type 13b engine i am currently doing the chamber edge of the eybrow cut is 8.5mm out from the outer edge of the water seal
obviously you cant use the 11mm ( for early open extend with floating leading edge side seal )
measurement for the main port as there will be very little bridge left to hold the corner seal captive

the 8.5 mm is used against the stock port open edge timing ( 14.5 mm ) [ read 6mm bridge meat ]
as seen on NO and R5 plates ( and D and G )
( and the main port shape is taken upwards as a later close )

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Fri Dec 30, 2011 9:40 pm 
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No worries thanks,
I've got the S4 6 port engine, mine has been ported from the water seal inner edge to the start of the inner bridge edge (datum) at 10mm with a 3mm bridge.
what do you reckon?


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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Fri Dec 30, 2011 11:54 pm 
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i think you may be very close to the limit and may find the end of the apex seal or corner seal is not captive enough
i use a template and so my scribe mark lays inside that and works out at 6mm for the bridge
the template itself is around 4.7 mm along the bridge meat

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Sat Dec 31, 2011 8:57 pm 
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happy new year ! :bounce3:


------------

your typical late rx4/5 R5 jap combo,, R5 endplates and NO centre plate with late font housings

note-
- limitations of the port casting of the NO plate that restrct the size of the allowable porting

- ramped floor required to take the R5 plates to the same main port timing that D or G s4/5 turbo plates easily port to
( the R5 has a slighly lower casting limit than the later plates and requires the angled floor in the bowl )

- limitations of the port casting jacket of the R5 plates to the high/late bridge ports
and the notch trick used to get around breaking through the casting
this port is still as tall as the runner but offset higher/later


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PS

for a VW !

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Mon Jan 02, 2012 7:09 pm 
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Joined: Mon Sep 21, 2009 4:09 pm
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Location: Barossa Area
G'day again guys,
Just a question re Housings, I've just got hold of some extend Port 13b R5 Plates but only have 2 good S4 Housings,
I do have a pair of housings to suit the R5 plates in the garage but one has a score down the centre due to a broken seal in the past.
Just wondering if this will affect the engine at all? I'm building a Bridgeport engine for my son so he doesn't have a lot to spend, hence after a little info re the use of the housing.
Thanks


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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Tue May 22, 2012 1:50 pm 
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my center plate and rear plate have just a N on them? 42mm end plates and 50mm center top to bottom whats this out of s2 rx7?

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Tue May 22, 2012 3:36 pm 
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yes, sounds like an aussie N grey circa 1980-81

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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Fri Jun 22, 2012 5:36 pm 
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Joined: Wed Jun 23, 2010 8:33 pm
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Location: NZ
question for you knowledgeable ones, how crucial is it that the exhaust ports are the same size on a cabied 12a? I've finally found two usable housings, one desleeved and heavily ported, the other still has a sleeve and only mildly modified.


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 Post subject: Re: Everything You'd want to know about Porting on a Rotary
PostPosted: Fri Jun 22, 2012 5:51 pm 
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they should be closely matched....same with any engine


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