ok I have heard this term tossed around a lot... what is BRIDGEPORT mean?

Dave

 

Porting a rotary (street, brigde, peripheral, etc.) is the equivelant of adding a big cam to a piston engine. Check out www.nopistons.com They have a really nice section on rebuilding and porting. This should be required reading for most. So how does it happen that you are in Grand Rapids, but I don't know you? Are you going to Grattan on the 4th? I think I remember seeing Spooledupracing on one of the entries...

 

ill have to join there too lol!

 

http://fc3spro.com/TECH/PORT/porting.html


-Ted

 

If a motor is streetported, is it possible to bridgeport the same rotor housings or will they have to be replaced? Maybe you could J-port them?

 

if you look at the link RETed posted, you can see that the bridgeport was also street ported so yes it is possible to use the same plates

 

I looked at the link-The reason I asked was becouse the pic in the link looked like there might not be enough room between the streetport and the edge of the rotor housing to fit the proper bridgeport. I guess it all depends on how wild of a streetport you have.

 

Depends on the side of the port outlet on the alleged street port. In my experience, there's a vast world of opinions when it comes to what a "street" port is. Alot of people port their housings in a way that doesn't lend itself to being bridgeported later with respect to keeping the iron bridge itself thick after the bridgeport cut has been made.

B

 

Thanks BDC. In the link above it looks like the j-bridge port has kinda been jb welded-is that what they do? If thats the case and you wanted to j-bridge port you wont have to replace the housings. Right?

 

J-bridges usually have the shortest life of all the non-peripheral ports. Essentially they're using JB weld because they're cutting into the waterjacket, which will eventually lead to coolant leaking into the combustion chamber after some use. So to put it short and sweet, with a J-bridge, you'll be replacing housings and Irons quite frequently.

 

Thanks.

 

Do regular bridge ports tend to be reliable? It seems like you might have a weak link porting that close to the side of the rotor housing.

If they are reliable, everybody looking for speed should bridgeport. Why not?

 

That's the problem - they are not.
If the bridge fails, you get a catastrophic engine failure.


-Ted

 

looking at the ports i didnt think that the bridge can fail as much as people say but i guess when you port it, the structure becomes less sturdy..is that right?

 

That sux. No bridgeport for me.

 

Depends on the cut; depends on how much iron is left over as a seal bridge. As I've said, I've got a number of them out there and have been playing around with these things for 3 1/2 years; a few having produced a good amount of power.. and not a single one has failed; even the one that had literally 3mm of thin and shallow bridge iron left over.

B

 

wow beated me to it, I was about to bust out that link

 

You wouldn't know the difference between a half bridge port and a half built bridge!!!