Bridge Porting the Renesis
05-23-2009, 02:31 PM
#1
Bridge Porting the Renesis
A little enlightenment for the masses. I would like everyone to see the available space allowable for bridge porting a Renesis
Apex Seal height (this is a used seal),
Overlap?
Widest part of the iron between the port and the housing,,
Narrowest part of the iron betwen the port and housing,,
Apex seal in relation to port (widest),,
Apex seal in relation to port. (narrowest),,
So there you go. I would like to hear from the "experts" on this. Show me the dimensions of a Bridge port on a Renesis.
If anyone wants any other pics, angles or dimensions let me know.
Apex Seal height (this is a used seal),
Overlap?
Widest part of the iron between the port and the housing,,
Narrowest part of the iron betwen the port and housing,,
Apex seal in relation to port (widest),,
Apex seal in relation to port. (narrowest),,
So there you go. I would like to hear from the "experts" on this. Show me the dimensions of a Bridge port on a Renesis.
If anyone wants any other pics, angles or dimensions let me know.
Last edited by Easy_E1; 05-23-2009 at 03:12 PM.
05-24-2009, 12:54 AM
#8
OK here is a little info to get you going. I'm not wanting to rank on anybody. I'm just curious as to how this was done. And to the specs he claims.
I'm an inquiring mind. I want to know.
On port pictures, i wanted to take once but they werent finished, when i wanted to take they were closed already, but i did see enough, the ports were al made as i think what RG said about the intake opening earlier and primary a bit bigger, cleaning up and rounding to help side seal issue, the bridges was made at primary and secondary (not the high rpm ports, although they did do it there, it was decided to leave due to not so easy with the tube on inside.) the bridge is approx 5mm wide (the port of it) and running the length of the port itself.
Philip
I'm an inquiring mind. I want to know.
On port pictures, i wanted to take once but they werent finished, when i wanted to take they were closed already, but i did see enough, the ports were al made as i think what RG said about the intake opening earlier and primary a bit bigger, cleaning up and rounding to help side seal issue, the bridges was made at primary and secondary (not the high rpm ports, although they did do it there, it was decided to leave due to not so easy with the tube on inside.) the bridge is approx 5mm wide (the port of it) and running the length of the port itself.
Philip
05-24-2009, 08:39 AM
#12
i wish there was a way to fill in that little half circle shape on the trailing edge intake port--that thing is causing side seal problems. Why the hell it is there--I dont have a clue?
it would be a small bridgeport. would love to hear about side seal findings post bridging.
OD
it would be a small bridgeport. would love to hear about side seal findings post bridging.
OD
05-24-2009, 02:32 PM
#13
Registered
It still scares the crap out of me. I'm afraid of the small size of the bridge when it comes to longevity as well as potential flow issues from such a small port. I'll still wait for others to do it first.
05-24-2009, 04:08 PM
#14
Qucik Sliver
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ok im know a fair amount about port and polish but what is bridge port?? I have had my car for about a yr now and love the rotoy and looking to port it if its possable, is this the same thing?
05-24-2009, 04:18 PM
#15
05-24-2009, 10:28 PM
#16
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I agree that any bridge porting what so ever would have to be rather small. I too believe it would serously compromise the overall life of the motor.
There are details of the renesis bridge porting that are being left out either cause we're not able to see pics or because the owner is not aware of them. I'm not saying anyone is lying but there's gaps in how this could be accomplished that I'm not seeing.
There are details of the renesis bridge porting that are being left out either cause we're not able to see pics or because the owner is not aware of them. I'm not saying anyone is lying but there's gaps in how this could be accomplished that I'm not seeing.
05-25-2009, 12:18 PM
#18
I'm not sure there is a thing as a "mild" j-port lol... It could be done but you would have to fill some of the water jacket.
I am NOT an expert but I have a few observations/questions here.
First, why is the apex seal height being measured?
Second, you are measuring from the port to where the housing meets the iron. Shouldn't the measurement be from the side seal path to the inner waterseal edge to really find the correct measurement?
The main concern would be the side seal and where it ran across the iron face (side seal path). The side seals are roughly .70mm thick so you would need a bridge at least that thick.
So, if the side seal runs VERY close to the renesis ports (which I belive it does) you could def have some room to create a bridge port, not alot but enough.
Most bridge ports have the original ports stretched to the edge of the side seal path anyway and mazda never changed where the side seals are in the rotors (to my knowledge) so they both run the same path.
Like I said, I am NO expert but am curious as to the whole idea. Somebody please enlighten us further.
Edit: Philip_SA claims for a 5mm wide port. If the side seal does infact run against the outside edge of the original port I don't see why this isn't possible.
I am NOT an expert but I have a few observations/questions here.
First, why is the apex seal height being measured?
Second, you are measuring from the port to where the housing meets the iron. Shouldn't the measurement be from the side seal path to the inner waterseal edge to really find the correct measurement?
The main concern would be the side seal and where it ran across the iron face (side seal path). The side seals are roughly .70mm thick so you would need a bridge at least that thick.
So, if the side seal runs VERY close to the renesis ports (which I belive it does) you could def have some room to create a bridge port, not alot but enough.
Most bridge ports have the original ports stretched to the edge of the side seal path anyway and mazda never changed where the side seals are in the rotors (to my knowledge) so they both run the same path.
Like I said, I am NO expert but am curious as to the whole idea. Somebody please enlighten us further.
Edit: Philip_SA claims for a 5mm wide port. If the side seal does infact run against the outside edge of the original port I don't see why this isn't possible.
Last edited by jfxp; 05-25-2009 at 03:00 PM.
05-25-2009, 03:32 PM
#19
OK jfxp,,
First the side seal is not that much of a concern. If you refer to the pic below.
It is the Apex seal and end wedge for the Apex seal and corner seal that are the main issues.
Look at the picture below. You'll notice a shiny section fallowing the surface of the rotor housing where it meets the cast iron plate. And just to the inside(port side) you'll notice a darker area. These are the paths of the Apex and corner seals. Apex seal wear next to housing and corner seal more to the edge of the outside of the port. This is the area where the Bridge port is to be cut out of.
The reason for the Apex height measurement is to give you an idea as to how wide the bridge port can be and in relation to the existing port opening. If the port is cut to wide the apex seal has a chance to fall inside the bridge port port. As well as the apex corner wedge. Catastrophic things will happen if that should occur.
This picture shows the amount of room you have available to port along with the pic with the measurement of the cast area between port and rotor housing.
So you see that a portable area that is only 7.39mm wide at the widest point and and 6.34mm wide at the narrowest point and an apex seal that is only 5.63+/- does not allow for much of a port or bridge.
So if you cut a 5mm wide port or even a 4mm wide port, how well is that going to work. You do the math.
First the side seal is not that much of a concern. If you refer to the pic below.
It is the Apex seal and end wedge for the Apex seal and corner seal that are the main issues.
Look at the picture below. You'll notice a shiny section fallowing the surface of the rotor housing where it meets the cast iron plate. And just to the inside(port side) you'll notice a darker area. These are the paths of the Apex and corner seals. Apex seal wear next to housing and corner seal more to the edge of the outside of the port. This is the area where the Bridge port is to be cut out of.
The reason for the Apex height measurement is to give you an idea as to how wide the bridge port can be and in relation to the existing port opening. If the port is cut to wide the apex seal has a chance to fall inside the bridge port port. As well as the apex corner wedge. Catastrophic things will happen if that should occur.
This picture shows the amount of room you have available to port along with the pic with the measurement of the cast area between port and rotor housing.
So you see that a portable area that is only 7.39mm wide at the widest point and and 6.34mm wide at the narrowest point and an apex seal that is only 5.63+/- does not allow for much of a port or bridge.
So if you cut a 5mm wide port or even a 4mm wide port, how well is that going to work. You do the math.
