half-bridge life expectancy?
03-23-04, 01:09 PM
#1
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half-bridge life expectancy?
Hi.
How long would one expect a half-bridge motor to last? Both turbocharged and naturally aspirated, if anybody knows.
Victor
How long would one expect a half-bridge motor to last? Both turbocharged and naturally aspirated, if anybody knows.
Victor
03-23-04, 06:59 PM
#2
Old [Sch|F]ool
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.
RPM = Ruins People's Motors. The higher your peak and average RPM's, the shorter the lifespan.
03-24-04, 03:21 AM
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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.
03-25-04, 01:56 AM
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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.
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03-25-04, 10:27 AM
#9
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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.
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.
03-25-04, 03:06 PM
#10
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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)
03-25-04, 10:13 PM
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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.
03-27-04, 04:05 PM
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Originally posted by 87GTR
I have a half bp street car. and would never go back to a sp
I have a half bp street car. and would never go back to a sp
somethings you just cant go without.
03-29-04, 10:59 AM
#17
BDC Motorsports
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
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
03-30-04, 07:31 PM
#19
built my own engine
Originally posted by 93redFD
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.
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.
i got 24mpg on the way home
steve kan tuned and ported my motor
03-30-04, 07:48 PM
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Originally posted by 93BlackFD
that was me
i got 24mpg on the way home
steve kan tuned and ported my motor
that was me
i got 24mpg on the way home
steve kan tuned and ported my motor
03-31-04, 11:54 PM
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Originally posted by BDC
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
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
