bobybeach

Id like to share some photos off bridge ports i did on some off my engines.

The small bridge is the first engine i built and was my first attempt at porting.

The large bridgeport engine was from fd 13b and was stolen nearing the end of the project. these are all i have left of it know. A real **** off as i spent over 30hr porting to perfection. The photos dont do it juctice.

I am currently rebuilding my fc 13b so will also be bridgeporting this engine before reinstalling it.
Now that i have a digital camera i can take some real good photos this time.

Turblown

iTrader: (12)

I didn't know you could cut that far into the rotor housing. Looks great!

BUMBLEBEE7

iTrader: (1)

The porting looks GREAT! is it for a street or track.

atihun

Beautiful porting job!

Are you using one piece apex seals or two piece? If two, will there be a problem with the small corner piece of the seals going out and back in on the housing surface (intake ports)?

bobybeach

Thanks guys!

Both engines were for street use but the large bridge is not ideal for street driving.

The small ported bridge engine was used with 3 piece mazda seals, and the second engine with the large ports used 2 peice Atkins seals, but it to could have used 3 piece seals since the bridge is quite fat and can support both types comfortable.

No the corner seals never seems to be a problem since its wedged between 3 faces, the bridge face/ apex seal spring face/ and top apex seal peice.


Today I got started on my new engine........ since i cracked my stageII block under detonation.
I have decided to use 2 piece seal with bridge porting.
Using 2 peice seal gives me more confidince when making the bridge so norrow, since there is less need for support on 2 peice seals i think.

Anyway now that i have my digital camera........ heres what i got up to today.

A simple stage II with a nice wide brigeport. Im hoping this will give me plenty more mid range punch. Im not after peek power so im not even going to bother porting the runners, just a port match,
In my opiniun porting the runners is so time consuming and its not really worth it on a street car.

heres the pics anyway. they show the porting as the day progressed. total approx 3-4hr on one port. thats enough for one weekend i think.

atihun

Maybe I'm not seeing it right, but I'm referring to this image:



The added port opening on the rotor housing (J port?)... the corner of the corner apex seal piece runs on that outermost surface of the rotor housing.

I was just wondering if that had any effect.

dubulup

I was wondering that too...but since the "wide" part of the corner apex seal is on the bottom. I think the corner seal will hold the "corner apex" seal down. LOOKS FAWKING NUTS...have you run an engine with ports that extreme?

kuroi FD

what turbo are you going to run?

bobybeach

Yea they are well suported being wedged in by the bridge /apex seal spring/ and apex seal tip, The corner apex seal does not need to ride against the housing for support. Actually on new seals the corner piece is slightly under flush from the rest of the apex seals, so actualy doesnt touch the housing until engine is properly run in.

Yes i have run ports this extreme on non turbo 82 fb rx7, they pull slighlty stronger higher in revs but to be honnest still have plenty of mid-low torque. the only problem I found was the car always pulsed strongly on cruising throttle, which sounds real cool on the highway but little uncomfortable.

The J port pic above was intended with turbo but because it had been stolen before the car was completed i never had a chance to see how it would perform.

bobybeach

A few.

firstly i am fitting a to4b turbo with a machined stock fc turbine housing fitted.
Just curious since it didnt cost much to machine and then will bolt straight back up.

Then compare the diference with custom manifold and garrett 1.15 housing.

The to4b are under rated IMO they can make 350rwhp with to4b compressor and are very responsive. I dont really want big power! im actually after snapy high reving low boost 300-350hp something that can churp the wheels and masive power slides. drift style!

But since im a dealer for Masterpower turbos, I have a lots of turbos in stock on the shelves that call to me at nite........... Who knows!
Maybe a gt45 eventually.