Hi.

How long would one expect a half-bridge motor to last? Both turbocharged and naturally aspirated, if anybody knows.

Victor

 

If you drive it like a stocker, it should last like a stocker.

RPM = Ruins People's Motors. The higher your peak and average RPM's, the shorter the lifespan.

 

dam straight. Bridgeports are said not to last as long because its 'expected' that ppl are going to rev them harder. Not true I say, NOT TRUE!

 

also the carbon apex seals they usually run, and the chance of the bridge cracking, ehich can be minimized with i wider/ shorter bridge and steel seals, both of which slightly limit power/ max rpm.

 

how much more power and less Gas milage should one expect while driving with a bridge port?

 

depends highly on the porting and tunning

 

this topic has been discussed over and over again. Do a search on 'bridgeport'. 15-20mpg on a bridgy. Depends alot on where your driving, (highway or city) and how heavy your foot is.

 

I don't care about bridgeports, I care about half-bridges. I have searched.

or are you talking to that other guy?

 

I would say half-bridgeport is definetly the way to go for the street. First of all you don't have to idle at 2k, have more bottom end, can still use factory seals as long as you don't rev higher than 8500k, and definetly get better gas mileage, not sure how much better though.

Just don't go too big on it. This is the setup i've seen on a local engine builders car: Very small bridges on the intermediate plate w/primaries barely touched, bigger primaries on front and rear plates but not too big. The exhaust ports were barely touched also.

With this setup even with carbon apex seals the car started to kick in around 3800 rpm and 2nd power band kicked in around 7500k. Oh and it was on a 12a.

 

yeah...make sure you have it done professionally (the tuning and porting) otherwise your motor will be gone like mine was..so less tahn 5k miles. (on stock ecu and piggyback) HORRIBLE IDEA (couldnt afford a standalone)

 

Is there a downside to using ceramic seals on a bridgeport? (other than cost)

 

theres was a guy who helped me at the last dyno session in birmingham Al. He was using a "half bridge", I believe he said he was getting 15mpg city, 22 interstate, witch is better than than me with heavy sp.

 

redFD, what did his car look like? i was there, after all :P

 

...

 

I have a half bp street car. and would never go back to a sp

 

thats why im rebuilding mine somethings you just cant go without.

 

Honestly and truthfully, it depends greatly on how the vehicle is driven (naturally, in any case) as well as how the bridgeporting is done.

I do half-bridgeport turbo setups and have been for nearly a year now. I do a conservative type of port that leaves the bridge quite thick, leaving room for long-term reliability (hence the aspect of it being a street car). Most of the kinds of bridgeports that exist, however, are full bridgeports done on normally aspirated cars (from way back when) using bridges that are *extremely* thin. These thin bridges crack and eventually break from heat cycling from what I understand. If the bridge is left thick, it won't be an issue.



B

 

If you drive it normally, than it should last over 70k

 

that was me

i got 24mpg on the way home

steve kan tuned and ported my motor

 

24MPG!!! That's really good for a half bridge. You must drive pretty conservative.

 

I thought you had a full-bridge, 93blackFD? or did i mishear you when you told me your mods at the dyno?

 

half bridge

 

damn dude that port it beautiful. im getting a tear to my just looking at it.

 

Does anyone have a pic showing the differance between a half bridge as compared to a full bridge? As long as I have driven Rx7's, I'm surprised that I don't know anything about this.

 

The only difference between half and full is that on a full bridgeport the primary ports are also bridged.

B