Bridge Porting the Renesis
05-25-2009, 05:21 PM
#26
Apex seal height,, 5.65mm So you would have to be narrower than that so the apex and wedge would not fall in the port. So just saying it leaves you 4mm of port space available.
OK let's take 4mm form the narrowest point in the cast iron plate at the intake port. 6.34mm. That leaves 2.34mm for a bridge. If the port is up against the housing.
I would not put the port all the way to the edge but I would leave a little area for the top of the apex seal to ride on. We'll just say I leave 1mm up at the housing. That leaves a 3 mm port.\ and a 2.34mm bridge.
These are just basic numbers from the dimensions shown. Can you see where I'm going with this whole thread?
Yes you can. But not much with out hitting the housing water jacket seal area (red). The yellow section is the area you could modify but it's not that much of an area. It's only 3.5mm wide. As I said that's the wall that separates the combustion chamber form the water jacket seal (red). So if you were to do modify it, , I would not move it more than 1.5 to 2mm at the most. End result your weakening the area should high engine temps occur.
Last edited by Easy_E1; 05-25-2009 at 05:47 PM.
05-25-2009, 05:43 PM
#28
Why is this bad? Can the apex seal hang of the bridge? Does the bridge have to be 5.65mm?
Why? I only posted the pictures of the REW's to show how far those bridge ports extend.
Thats a pretty big area when we are only talking 5mm's, means you would only need ~2mm above it.
I did not know this. I do not have a renesis apart to look at as you do so can not tell all of the differences.
I did not know this. I do not have a renesis apart to look at as you do so can not tell all of the differences.
05-25-2009, 06:15 PM
#29
This area is only 3mm wide.
These pics are not indicative of the end result of a Renesis bridge port. They are a comparison to design only
This is why I would have loved to see pictures of the "Bridge Ported Renesis"
Last edited by Easy_E1; 05-25-2009 at 06:59 PM.
05-25-2009, 06:59 PM
#30
So technically you could make it work? Please excuse the extremely crude drawing lol (obviously not to scale or where the port would be). So according to your measurements, this would leave you at 1mm for the apex to ride on, which isn't much at all. Also, at what angle does a 5.65mm apex seal go to 3mm? I would think you would have more of a side the more strait up and down the apex seal is.
BTW: I'm just playing the other side of this. I have no plans of bridge porting a renesis. This is just for information sake.
BTW: I'm just playing the other side of this. I have no plans of bridge porting a renesis. This is just for information sake.
05-25-2009, 07:26 PM
#31
I appreciate that your getting involved in this discussion. Seems no one else want's to tackle this.
That is feasible if you wanted to cut into the rotor housing. It's the reliability and longevity of the engine when you start moving things to the extreme. Leaving .5mm on the housing to hold the water jacket seal in place is not a good idea in my book.
But I can see where your going with this.
This is something else to consider. Most bridge ports are ported by hand. I hope you have a steady hand to make that close of tolerances.
Something else to toss into the mix. The water jacket in the cast iron goes under the edge 4mm to the casting of the intake port.. The water jacket is the open area under the red line. So for you to port that close,,, to where your showing?
That is feasible if you wanted to cut into the rotor housing. It's the reliability and longevity of the engine when you start moving things to the extreme. Leaving .5mm on the housing to hold the water jacket seal in place is not a good idea in my book.
But I can see where your going with this.
This is something else to consider. Most bridge ports are ported by hand. I hope you have a steady hand to make that close of tolerances.
Something else to toss into the mix. The water jacket in the cast iron goes under the edge 4mm to the casting of the intake port.. The water jacket is the open area under the red line. So for you to port that close,,, to where your showing?
Last edited by Easy_E1; 05-25-2009 at 07:38 PM.
05-25-2009, 07:46 PM
#32
. This topic was interesting to me as I have ported a 13b-rew before (only streetport though). I do not know all of the differences in the motors either since I have never opened my renesis and hopefully never will lol.Would be too close for me but maybe a 4mm port would be more feasible?
05-25-2009, 08:05 PM
#34
anyone have the pictures of the houseing difference from older 13b to the rennie? I keep reading this and looking back at pictures. but have no idea what difference im looking at. Possibly many others dont know either..
Mark
well i guess it goes back to the picture EASY1 pictures posted
sorry
Mark
well i guess it goes back to the picture EASY1 pictures posted
sorry
Last edited by Z0oMzo0m; 05-25-2009 at 08:09 PM.
05-25-2009, 10:49 PM
#39
Sorry Team. To much stuff going on the past couple of days. I'll get right on it for you. 
No. The 7.34mm section is inside the rotor intake chamber. The 3.5mm section is under the edge of the rotor housing just before the housing seal groove (4mm section. Part of that is the other side of the seal groove. Refer to brown line on cast iron). If you were to cut into the housing for the port you could use some of that area. The port is going to have to be inside the 7.34mm area. Preferably inside a mm or two to hold the apex and the apex end wedge. I'm going to have to get some dimensions on that too.
More research is needed.
More research is needed.
05-25-2009, 11:39 PM
#41
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what if you went with a bridge about 50% of the max size you could do on the rennie? wouldnt that give you atleast +20-30hp be decent on the realiability part and still give you the brap brap brap at idle?
05-26-2009, 12:44 AM
#43
Where's the love? You know I'm just teasing you.
The Brap Brap Brap is from intake/exhaust overlap. That is not the same as the 13B REW engine with peripheral exhaust ports as with the 13B Renesis side exhaust. We'll get into that later on.
Last edited by Easy_E1; 05-26-2009 at 12:48 AM.
05-26-2009, 01:24 AM
#45
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yeah after thinking it through 2-3mm wouldnt really do anything what so ever haha but it would be awesome if we had a realiable port of some kind to do to the 8. i believe we will have one eventually =)
05-26-2009, 04:10 AM
#47
the first picture here was what I was thinking of as a mild j port: the housing has been radius so the bridge has more area without interfering with the seal.
exactly what jfxp is pointing out with the comparison of measured widths. the bridge port isn't limited to the 2-3mm between the port and housing.
05-26-2009, 12:55 PM
#48
if the seal can fall out how can a J-port work?
the first picture here was what I was thinking of as a mild j port: the housing has been radius so the bridge has more area without interfering with the seal.
exactly what jfxp is pointing out with the comparison of measured widths. the bridge port isn't limited to the 2-3mm between the port and housing.
the first picture here was what I was thinking of as a mild j port: the housing has been radius so the bridge has more area without interfering with the seal.
exactly what jfxp is pointing out with the comparison of measured widths. the bridge port isn't limited to the 2-3mm between the port and housing.
The port bridge location/size is also limited to the size of the Apex seal/end wedge. We have a 6.5mm apex seal. Not the larger Apex as found on the 13BREW and 20B.
13B Renesis,,
13B REW Apex,,
The REW is twice the height along with Apex end wedge also. This is a big concern in Bridge Porting. Keeping the end wedge from flying out. You must have enough of the cast iron available for this to ride on without being ejected from the rotor into the intake port. And it's 5.80mm +/-.
Last edited by Easy_E1; 05-26-2009 at 12:57 PM.
