after my streetported engine and last dyno of 165 at wheels i wasnt happy enouf with the power and after my sad engine blow shortly after (due to non engine rebuild failure that i wont mention here) i have decide ever since to go with a full bridge. My goal was to no build the engine for above stock RPM, which is 8500 on a stock s5. so i was hoping to get about 220-230 whp. i wont be using the 6 port sleeves and at this moment i havent decided if i will join the 2 round inlet holes at the side of the housing, i wont join the ports at the rotor because the bridge would be too long and most likely not strong nenouf to last a while. this is a street car and a "daily" driver as well as weekend racer. i am gonna go with a custom intake manifold tha ti will be makign and stock throttle body. none of the stock inatake manifolds will be used. i am also using a haltech and stock injectors and fuel pump for now, if i run out of fuel i will upgrade. the primaries are also gonna be bridged and that is gonna be a TII housing. on the intake manifold i will have 3 large pipes, one will be blended in to the primary housing and then to the primary TB plate and then each of the secondary will be the other pipe. the TB will be modified to only open the primary plate with the throttle and teh secondary plates will open at a set rpm and that will open all teh rest of the ports on the side housings. i will have pics for more info and clarity.



here is a pic of the ROUGH port.





http://24.2.177.252/cars/!My%20Picture...rt/DSC00002.JPG

That is looking excellent. Remeber to concentrate where the bridgeport opens and closes inside the port walls. give it as much flow and angle as you can. great Job so far.

Gorgeous port, so far! https://www.nopistons.com/forums/pub...IR#>/happy.png

ooooohhhhh!!!!



I like and I am soon to join you.

I am not too sure about the blending the circular ports togeteher though. Wouldn't the port be too large so as to maintain flow velocity? This is something I have been thinking for my own but I think maybe changing the shape of each individual port so as to give each of the port openings the best possible flow might be more beneficial.

Don't you need to use one piece apex seals for a full bridge?

Here's mine for comparison. The 2nd bridge isn't made yet.

In the first pic I see that it was ported into the water seal, will that hurt reliability or will the seal stay in place?

He has to install a metal fence to hold the coolant seal inplace.

a few more pics

one more

one more

one more

one more

last one https://www.nopistons.com/forums/pub...IR#>/happy.png

that is a 2 inch pipe i might have to go slightly bigger, since it doesnt fit that great, or i can port ou tteh flange that the pipe will go on some.

this is a digram of the intake manifold for clarification

But don't those eventually give away?

umm just quickly on your inlet manifold, you might want to think about keeping each center runner individual or joining to their respective secondary runner, instead of how you have it converging into one.



Just a thought https://www.nopistons.com/forums/pub...IR#>/smile.png the bridge looks great though.

Do you have a pic of what this metal fence looks like?

oh yea i just thought about that it needs longer pulse width, good point https://www.nopistons.com/forums/pub...IR#>/smile.png

some dimensions i took on the housings , i want to join the 2 hoels on the NA it only seems appropriate for teh size port that it needs to flow. i also measured the FD for comparison.

just a quickie...



Has anyone ever tried to join the 2 primary ports together? if so how did it work out?

i doubt it woudl eb such a good idea, since the pulses will be "lost"

but it coudl still amke mroe power just from the shear volume

little update on what i have decided to do. connected the bridge and the secondary and aux ports, also joined the port opening at the manifold side, and i am not gonna bridge the primary anymore but just do a large streetport on turbo plate.

one more

https://www.nopistons.com/forums/pub...DIR#>/ohmy.png



that is gigantic!



https://www.nopistons.com/forums/pub...IR#>/bigok.gif

https://www.nopistons.com/forums/pub...DIR#>/ohmy.png



That's a very cool idea, but I would be very worried - the length of that bridge, looks like it might break!!

Actually I think its supported as seen in the side port view

yes it is, i am not going to cut that support just because of the lenth of that port.

i was thinking about also leaving one under the water seal area bu ti am not sure if i need to.

This is the direction this has me thinking. Take those two holes and treat them as if they were the throttle body on a GM TBI.

Also the upper port without the sleeve is going to be very turbulent. How would we be able to prepare the port for epoxy to make it flow more like the secondaries?



just my $1.50...

exactly, i was thinking abotu that too, i might weld a piece in there to help teh flow

My God! That port is GINORMUS! https://www.nopistons.com/forums/pub...1047683572.gif https://www.nopistons.com/forums/pub...1047683572.gif Will the engine idle with that?

I would be worried about the epoxy coming loose! https://www.nopistons.com/forums/pub..._DIR#>/sad.png



Couldn't that happen if you used the filler?

Others here have used it with success. Whats the name of the stuff Racing Beat sells. Its a 2 part metallic epoxy... *not JB weld!*... lol

I would be mainly concerned about the expansion properties of the epoxy with heat and cold..



I don't have much experience with epoxy, though. Curious if you guys can answer any of my questions..

this is what i have foudn in teh reacing beat catalog and i will give it a try i guess

here is a pic fo the escription.

Yup thats the stuff. I hear you just gotta apply it in layers to allow each layer to cure and set. Then after that its time for the grinder.

i will talk toracign beat beore i use it