oh yeah? whats the differance? Some details would be great. I'm sure one day I'll go to the full bridge

 

For those of you interested in/questioning/making false statements about the specs of my Turbonetics 60-1HIFI, I've got some pictures I took of it yesterday after I unbolted it off the manifold. Have a peek and see just exactly how "large" it really is.

http://bdc.cyberosity.com/v/ProjectC...uild/60-1HIFI/

B

 

We all know those are really staged photos! At least I'm sure some will claim that.

 

ah, silly me.

Does anyone have any opinions on the NA setup?

 

What a "wimpy" turbo, B.

 

compared to the t70 maybe

 

I visited BDC's shop about a week ago when I was in texas and he definetly doesn't have any milling machines or anything of the sorts. All his stuff is done by hand, and for all of you who have just seen pictures the pictures don't justify how amazing his work is.

 

My BP goes in here shortly. Ludwig built a motor with an identical turbo and a street-port. It dynoed 442whp. We should have some good numbers for comparison when I hit the dyno.

 

How many of you are having to chop into your rotor housing to relieve the bigger bridges?

 

I talked to steve kan. His comments were that a halfbridge is over rated. You can achieve the same max HP numbers. He said you gain a little midrange with halfbridge, so it just shifts your powerband. He also said that after a while of abuse, depending on how large the bridge port is it will crack into the seal and you will have to rebuild. He said this is due to high heat and little metal left on the housing.

I have a halfbridge, and i like mine. 490rwp at 20psi with alcohol injection. Hopefully it will keep it cool

 

I was a road racer way before I was a drag racer. either way, different forms of driving require different setup. I do like people who runs the HBP comment on their water and air temp compared to a SP though.

 

I wish rice racing was here, he would say that a stock port with AI is the best. Good read, I ate 2 bags of popcorn and almost choked from laughing. keep this one going.

 

Bringing the powerband lower while keeping peak the same is ALWAYS a good thing.

You know... I have heard people say this since time immemorial (or at least about 1997, when I first got interested in rotaries)

BUT

I have never heard ONE instance of a properly sized (not 1mm thick or heavily backcut or whatever) bridge failing.

This would seem to be especially unlikely for halfbridging given that, in theory, the center housing would be weaker since the wall thickness is thinner, and a halfbridge is only on the much meatier end housings. If a bridge will fail it will in all likelihood be in the center housing, only I've never heard of one of those failing either.

If I'm wrong and there are documented cases of properly constructed bridges cracking and falling out, then bring forth the info. (And not third or fourth hand "My mate knows a guy whose friend broke a bridge" beer-lubricated claims, either ) OTOH, I remember one guy whose J-Bridge 13B finally started seeping coolant into the chamber after 13 YEARS of service, still ran fine too. Obviously it wasn't driven much, only about 50k kms on it, but that just means more heat cycles, which seems to be the claim du jour for cracking bridges. (Usually people claim it's from the rotor pushing on it, which is bunk given that the rotor stabilization is mainly done via the oil seal springs. My favorite explanation was that boost pressure pushes the bridge in! No lie!)


edit: I just re-read your post and realized that you meant the water seal area, not the bridge, cracks. That I *can* believe, given that my ROTOR HOUSINGS broke (peripheral port, 1/2" thickness between port and wall) and that the grooves-in-side-housings engines are notoriously weak in the seal area anyway.

Solution would seem to be, ditch the seal altogether and use Right Stuff. I don't think you even need water seals with Right Stuff, in fact I plan on putting an engine together this way just to try it out! It certainly is effective at preventing oil leaks when you forget to put O-rings into the oil filter pedestal! (I am not kidding either!)

 

my friends J bridge did maybe 3 years before it started pushing water, only real symptom is the car was hard to start first thing, like an fd with bad water seals....

but 3 years @11k rpms, maybe it was due to come out for a "freshening" anyways

 

I just droped my pants, looked down, and realized I have a truely massive *****.
Given the amount of homosexual activity in this thread exhibited by a number of posters that may not be such a great thing, so I'm out of here

 

My car has a street port with no other mods then that. It made 610 whp and 455 lb ft torque around 4800 rpms full boost 28 lbs with the torque holding flat for the most part all the way up to 8500 rpms. The turbo is just a 66mm compressor, stock mount race intercooler, no water or alcohol injection, just C16.
The backpressure is building up to much and its diluting the next intake charge with exhaust gas,and thats why it had a dip in the torque curve up top.
All I can say is, for a completely stock mazda 2mm seal motor with just a street port and not a gigantic sized turbo, it made good power. Guess its all in the tuning

 

My stock port is the best. No SP, BP, or PP can't even come close.
Porting is over rated anyway. All you need is a die grinder and a couple of cutting bits and anyone can port. Just like tuning which is even easier. With the right equipment, laptop and wideband it's much easier than on the playstation anyday.
Who needs a dyno? People who brag about their dyno sheets are most of the times the ones that can't even drive or handle their dyno queen!

 

Now who needs to lay off the picante?

 

No picante down here. Just good old jerk sauce!

 

Another decent thread infected yet again by people acting like idiots... welcome to the Internet.

B

 

I can tell you after what I learned today, my next engine WILL be a full bridgeport and I will never have a street port again. Not gonna go into it, but take if for what its worth. A bridgeport makes a **** load more power than a street port.

 

Uhhhh....care to give cliff notes?

 

I was waiting to see when you were going to mention this.
Oh yeh Greg is the leak in the organisation!

 

Hey now, I never posted any numbers to anyone

 

Yeh I know but you were the first to post the news on here.