Bridgeport RX8
06-19-2009, 08:35 PM
#176
Given my experience with turbo bridgeport Rx-7's over the past 6 years, I don't think it'll be an issue really. It'll change how it runs; that's for sure. The only concern I have, and it may not have much merit, is the exhaust port design on the Renny. It's only going to go so far.
B
B
Mine opens a little earlier that yours...it leaves about 1mm between the edge of the eyebrow and the O-ring land.
The pics just show the bridge port and the notch in the housing....Today I also ported the rest of the ports including the exhaust...which I am making open a few degrees earlier and I finished up everything nicely also...
I only did the secondaries....so its effectively a half bridge...
What do you think?
This engine is going into the car in the next few days so I will be able to answer whether it takes FI well or no....can you say 500whp again but this time on a halfbridge?
SWEET!
Chris
oh!..ps...the last picture is a tease....don't ask about them...we will announce when they go officially on sale on the site.
06-19-2009, 08:38 PM
#177
I checked...it is not....the water jacket goes until about 1/8" from the side edge(closing edge) of the port....so it wont work...sad... I did find a way of porting the exhaust that should increase duration and flow but it is not as huge as a bridge would've been. Either way....we will know soon whether half bridge or not makes a difference when I get it running next week.
Best regards,
Chris
Best regards,
Chris
06-19-2009, 08:39 PM
#178
BDC Motorsports
Looks like we had the exact same idea, Chris!
Yep the cut length I did that length purposefully. The intake runner is round and I didn't want to make a cut that went too deep so I kept it where it was. It oughta work. The work on the rotor housing like you did is also (basically) required, too.
Great minds think alike! (hopefully, heh)
B
Yep the cut length I did that length purposefully. The intake runner is round and I didn't want to make a cut that went too deep so I kept it where it was. It oughta work. The work on the rotor housing like you did is also (basically) required, too.
Great minds think alike! (hopefully, heh)
B
06-19-2009, 08:40 PM
#179
Looks like you and I have been working on the same thing....
Mine opens a little earlier that yours...it leaves about 1mm between the edge of the eyebrow and the O-ring land.
The pics just show the bridge port and the notch in the housing....Today I also ported the rest of the ports including the exhaust...which I am making open a few degrees earlier and I finished up everything nicely also...
I only did the secondaries....so its effectively a half bridge...
What do you think?
This engine is going into the car in the next few days so I will be able to answer whether it takes FI well or no....can you say 500whp again but this time on a halfbridge?
SWEET!
Chris
oh!..ps...the last picture is a tease....don't ask about them...we will announce when they go officially on sale on the site.
Mine opens a little earlier that yours...it leaves about 1mm between the edge of the eyebrow and the O-ring land.
The pics just show the bridge port and the notch in the housing....Today I also ported the rest of the ports including the exhaust...which I am making open a few degrees earlier and I finished up everything nicely also...
I only did the secondaries....so its effectively a half bridge...
What do you think?
This engine is going into the car in the next few days so I will be able to answer whether it takes FI well or no....can you say 500whp again but this time on a halfbridge?
SWEET!
Chris
oh!..ps...the last picture is a tease....don't ask about them...we will announce when they go officially on sale on the site.
06-19-2009, 08:40 PM
#180
BDC Motorsports
I checked...it is not....the water jacket goes until about 1/8" from the side edge(closing edge) of the port....so it wont work...sad... I did find a way of porting the exhaust that should increase duration and flow but it is not as huge as a bridge would've been. Either way....we will know soon whether half bridge or not makes a difference when I get it running next week.
Best regards,
Chris
Best regards,
Chris
B
06-19-2009, 08:47 PM
#181
This engine IS going into my car next week....to complement everything else...
I couldn't wait to experiment so we will know how it well it works or not....experimenting is the sometimes the only way to know
The engine in the car sucked a piece of rubberized paper gasket I made (from the custom intake manifold) into it and it didn't really damage anything but it was in there and it got lodged into and all around the rotor and wasn't giving good compression so I had to pull it out after only 50 miles of testing on the new setup
....but this oppened up the door for this porting...so we will see soon enough whether its worth all the trouble.....Also, REMIND ME TO NEVER USE "Oreilly's Auto" CHEAP GASKET PAPER ON ANYTHING IN AN ENGINE EVER AGAIN....Now I made aluminum Gaskets and I will use silicone in their installation.
Chris
I couldn't wait to experiment so we will know how it well it works or not....experimenting is the sometimes the only way to know
The engine in the car sucked a piece of rubberized paper gasket I made (from the custom intake manifold) into it and it didn't really damage anything but it was in there and it got lodged into and all around the rotor and wasn't giving good compression so I had to pull it out after only 50 miles of testing on the new setup
....but this oppened up the door for this porting...so we will see soon enough whether its worth all the trouble.....Also, REMIND ME TO NEVER USE "Oreilly's Auto" CHEAP GASKET PAPER ON ANYTHING IN AN ENGINE EVER AGAIN....Now I made aluminum Gaskets and I will use silicone in their installation.Chris
06-19-2009, 08:52 PM
#183
This engine IS going into my car next week....to complement everything else...
I couldn't wait to experiment so we will know how it well it works or not....experimenting is the sometimes the only way to know
The engine in the car sucked a piece of rubberized paper gasket I made (from the custom intake manifold) into it and it didn't really damage anything but it was in there and it got lodged into and all around the rotor and wasn't giving good compression so I had to pull it out after only 50 miles of testing on the new setup....but this oppened up the door for this porting...so we will see soon enough whether its worth all the trouble.....Also, REMIND ME TO NEVER USE "Oreilly's Auto" CHEAP GASKET PAPER ON ANYTHING IN AN ENGINE EVER AGAIN....Now I made aluminum Gaskets and I will use silicone in their installation.
Chris
I couldn't wait to experiment so we will know how it well it works or not....experimenting is the sometimes the only way to know
The engine in the car sucked a piece of rubberized paper gasket I made (from the custom intake manifold) into it and it didn't really damage anything but it was in there and it got lodged into and all around the rotor and wasn't giving good compression so I had to pull it out after only 50 miles of testing on the new setup
....but this oppened up the door for this porting...so we will see soon enough whether its worth all the trouble.....Also, REMIND ME TO NEVER USE "Oreilly's Auto" CHEAP GASKET PAPER ON ANYTHING IN AN ENGINE EVER AGAIN....Now I made aluminum Gaskets and I will use silicone in their installation.Chris
well, sometimes good things come out of bad situations
I'd love to see your car in person sometime, I'm about 4 hours from you
06-21-2009, 09:40 PM
#188
Did you touch the outer edge (closing) of the exhaust port at all to get to this port?
I barely touched this edge on a different plate I tried before and when I opened up after about 5k miles....it had edge wear on the edge....and it was due to the corner seal slightly tilting into the port...apparently the side edge...as it comes stock is as far out as it could be...
I saw the wear on the corner seals...and on the edge of the port....it wasn't the side seals because these displayed no marks or wear whatsoever.
I actually finished the bridge plates yesterday and assembled the motor today so we will see how much difference it makes. I did the exhaust and I ported it downward about 1/16" but most of the changes was to the inside of the port where it was straight in and not it opens up to match the sleeve. I also did the "V" shape at the top of the exhaust and it is smooth going in but not as rounded as the one in your pic....
I'll fill everyone in once I get the engine in the car...so far it turns fine with no catching of any seals on the bridgeports
Everyone, cross your fingers. :P
Chris
06-21-2009, 10:39 PM
#189
BDC Motorsports
If there's any part of the port I wasn't confident in, it's that exact spot.
I barely touched this edge on a different plate I tried before and when I opened up after about 5k miles....it had edge wear on the edge....and it was due to the corner seal slightly tilting into the port...apparently the side edge...as it comes stock is as far out as it could be...
I saw the wear on the corner seals...and on the edge of the port....it wasn't the side seals because these displayed no marks or wear whatsoever.
I actually finished the bridge plates yesterday and assembled the motor today so we will see how much difference it makes. I did the exhaust and I ported it downward about 1/16" but most of the changes was to the inside of the port where it was straight in and not it opens up to match the sleeve. I also did the "V" shape at the top of the exhaust and it is smooth going in but not as rounded as the one in your pic....
I'll fill everyone in once I get the engine in the car...so far it turns fine with no catching of any seals on the bridgeports
Everyone, cross your fingers. :P
Chris
I saw the wear on the corner seals...and on the edge of the port....it wasn't the side seals because these displayed no marks or wear whatsoever.
I actually finished the bridge plates yesterday and assembled the motor today so we will see how much difference it makes. I did the exhaust and I ported it downward about 1/16" but most of the changes was to the inside of the port where it was straight in and not it opens up to match the sleeve. I also did the "V" shape at the top of the exhaust and it is smooth going in but not as rounded as the one in your pic....
I'll fill everyone in once I get the engine in the car...so far it turns fine with no catching of any seals on the bridgeports
Everyone, cross your fingers. :P
Chris
B
06-23-2009, 11:36 AM
#191
Here are a few pics of the engine showing the bridge porting/exhaust porting before it got polished/buffed up and the extra added dowel pins.
This will hopefully be running sometime in the next 5-6days....I'll keep you updated..."crosses fingers"....
Best regards,
Chris
This will hopefully be running sometime in the next 5-6days....I'll keep you updated..."crosses fingers"....
Best regards,
Chris
06-23-2009, 05:17 PM
#195
06-23-2009, 08:24 PM
#199
The stock car has two, its actually four small ones but they count as two. I add two more. One goes right in between the spark plugs and the other one goes one over past the stock top dowel pin. In the pic you can see the two I add.
These two dowels will prevent the dowel ring land on the front plate from cracking under detonation or extreme power which is the next thing to go after you have strong apex seals or if by some weird reason your stock ones don't break first. When this cracks it starts leaking oil even though it remains running perfect. There is also a modification that is done to these bores to ensure that the load is not concentrated on the surface of the plates...this is my technique and I don't want to let it out of the bag. With the extra dowels and modifications....you can pretty much boost it past 30psi if you like and have enough fuel without any issues.
Chris
These two dowels will prevent the dowel ring land on the front plate from cracking under detonation or extreme power which is the next thing to go after you have strong apex seals or if by some weird reason your stock ones don't break first. When this cracks it starts leaking oil even though it remains running perfect. There is also a modification that is done to these bores to ensure that the load is not concentrated on the surface of the plates...this is my technique and I don't want to let it out of the bag. With the extra dowels and modifications....you can pretty much boost it past 30psi if you like and have enough fuel without any issues.
Chris
06-23-2009, 08:58 PM
#200
These two dowels will prevent the dowel ring land on the front plate from cracking under detonation or extreme power which is the next thing to go after you have strong apex seals or if by some weird reason your stock ones don't break first. When this cracks it starts leaking oil even though it remains running perfect.
Chris