Half bridge port, who has one?
07-26-04, 10:21 PM
#1
Half bridge port, who has one?
I'm going to be rebuilding my motor soon and I'm 90% sure I want a half bridge ported motor.
I was wondering how many 3rd gen owners have a 1/2 bridge and how u like it?
I'm going to be rebuilding and porting the motor my self. So any info that you have would be great. Links ect....
The car is going to be streeted but not a daily driver.
I was wondering how many 3rd gen owners have a 1/2 bridge and how u like it?
I'm going to be rebuilding and porting the motor my self. So any info that you have would be great. Links ect....
The car is going to be streeted but not a daily driver.
07-27-04, 07:43 AM
#2
built my own engine
that would be me....be prepared to spend a lot of time/money on tuning
and its not for the street...stop and go traffic, etc...
car drives like crap until it is warm
and its not for the street...stop and go traffic, etc...
car drives like crap until it is warm
07-27-04, 08:15 AM
#4
Rotary Freak
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one of the guys at my mechanic's shop has a half bridge big single. it actually idles quite well. somewhat lumpy, but consistent. as far as power, he's got plenty.
plan on spending lots of time tuning.
plan on spending lots of time tuning.
07-27-04, 08:31 AM
#5
Eats, Sleeps, Dreams Rotary
I was also considering this. The only thing I really know is that idle gets lumpy...I kinda like that sound...Your powerband gets shifted upward in the rpm range...and of course you get shitty gas mileage..But then again who cares about gas mileage. Would like to hear the opinions of everyone on this.
07-27-04, 08:39 AM
#6
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i'm kinda wanting to do the same on my next motor. i've got a pretty large street port right now. any certain things that should be taken into consideration? the fuel mileage isn't so important. what kind of miles are people getting out of them? i know life is taken down a little due to the extra port
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07-27-04, 02:04 PM
#8
Original Gangster/Rotary!
iTrader: (213)
Originally Posted by apneablue
I was also considering this. The only thing I really know is that idle gets lumpy...I kinda like that sound...Your powerband gets shifted upward in the rpm range...and of course you get shitty gas mileage..But then again who cares about gas mileage. Would like to hear the opinions of everyone on this.
? Just ask Genghis to replicate my ports 
07-27-04, 02:11 PM
#9
Eats, Sleeps, Dreams Rotary
Originally Posted by GoodfellaFD3S
My idle isn't lumpy enough for ya, big Dave ? Just ask Genghis to replicate my ports
? Just ask Genghis to replicate my ports
07-27-04, 03:25 PM
#11
built my own engine
be prepared to have your car rock back and forth at red lights, and people will stare...
some will tell you your car needs a tune up, or it sounds like you lost a cylinder
some will tell you your car needs a tune up, or it sounds like you lost a cylinder
07-27-04, 03:29 PM
#12
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Originally Posted by 93BlackFD
be prepared to have your car rock back and forth at red lights, and people will stare...
some will tell you your car needs a tune up, or it sounds like you lost a cylinder
some will tell you your car needs a tune up, or it sounds like you lost a cylinder
07-27-04, 04:07 PM
#14
Originally Posted by 93BlackFD
be prepared to have your car rock back and forth at red lights, and people will stare...
some will tell you your car needs a tune up, or it sounds like you lost a cylinder
some will tell you your car needs a tune up, or it sounds like you lost a cylinder
I'm going to rebuild it my self and port it my self..... any links on where to do the porting? and any good templates?
i want my bridge to be a thick bridge so it will last longer....
3 weeks i will be rebuilding it! ill get vids :_
07-27-04, 04:20 PM
#17
Take what I say w/ a grain of salt, cuz none of this is 1st hand info (I don't have a bridgeport myself). But I did my fair bit of research about it, since I was contemplating going that route.
Bridgeported engines:
- definitely have a much higher "idle" if you can even call it that
- have very short life span...I've heard estimates in the range of 30-50K miles only. Seriously
- have almost no low end power...be prepared to crall until higher rpms
- are practically unstreetable. I've been told that the waterpump on the bridgeported engines is running so slow it's basically not working (ie extremely inefficient) at lower rpms, and thus can give you problems if you spend a lot of time at low rpms (stop & go, traffic, etc). It's made for WOT pretty much.
If some of this is wrong, please feel free to correct me, but that's the info I got from many sources...and based on it I decided not to go w/ even a half bridgeport.
Bridgeported engines:
- definitely have a much higher "idle" if you can even call it that
- have very short life span...I've heard estimates in the range of 30-50K miles only. Seriously
- have almost no low end power...be prepared to crall until higher rpms
- are practically unstreetable. I've been told that the waterpump on the bridgeported engines is running so slow it's basically not working (ie extremely inefficient) at lower rpms, and thus can give you problems if you spend a lot of time at low rpms (stop & go, traffic, etc). It's made for WOT pretty much.
If some of this is wrong, please feel free to correct me, but that's the info I got from many sources...and based on it I decided not to go w/ even a half bridgeport.
07-27-04, 04:23 PM
#18
built my own engine
you're wrong, on all of it
1st, it idles higher because it has NO vaccum, this is required for the engine to run, so yes, it does idle higher, but we're talking 1300rpms on my car for example
2nd, life span is totally dependant on how the port is cut
3rd, no low end power? ask anyone who has ridden in my car, it is not lacking in any area required for streetability
4th, the water pump issue is with race engins, designed for 8k+ all the time, that's old school info
we're talking HALF bridge port, meaning only the secondary runners are bridge'd, you're talking full bridge, which is diff
1st, it idles higher because it has NO vaccum, this is required for the engine to run, so yes, it does idle higher, but we're talking 1300rpms on my car for example
2nd, life span is totally dependant on how the port is cut
3rd, no low end power? ask anyone who has ridden in my car, it is not lacking in any area required for streetability
4th, the water pump issue is with race engins, designed for 8k+ all the time, that's old school info
we're talking HALF bridge port, meaning only the secondary runners are bridge'd, you're talking full bridge, which is diff
07-27-04, 04:36 PM
#21
Originally Posted by 93BlackFD
you're wrong, on all of it
1st, it idles higher because it has NO vaccum, this is required for the engine to run, so yes, it does idle higher, but we're talking 1300rpms on my car for example
2nd, life span is totally dependant on how the port is cut
3rd, no low end power? ask anyone who has ridden in my car, it is not lacking in any area required for streetability
4th, the water pump issue is with race engins, designed for 8k+ all the time, that's old school info
we're talking HALF bridge port, meaning only the secondary runners are bridge'd, you're talking full bridge, which is diff
1st, it idles higher because it has NO vaccum, this is required for the engine to run, so yes, it does idle higher, but we're talking 1300rpms on my car for example
2nd, life span is totally dependant on how the port is cut
3rd, no low end power? ask anyone who has ridden in my car, it is not lacking in any area required for streetability
4th, the water pump issue is with race engins, designed for 8k+ all the time, that's old school info
we're talking HALF bridge port, meaning only the secondary runners are bridge'd, you're talking full bridge, which is diff
Thanks for clearing it up though. So lemme ask you this...what exactly are the benefits and downsides to a half bridgeport??
I don't care about gas mileage or higher idle....and you said low end power is good? So what are the downsides? How's engine life? etc?
Thanks
~Ramy
07-27-04, 04:40 PM
#22
93BlackFD U OWNED FDNewbie LOL!
I would really like to port the motor my self, but if u guys think that its going too hard to port my self then about how much is it going to cost to be ported?
i have done porting on my old 86 rx7 that i had that went fine i think that if iwere to take it slowly i bet that i could do it my self. PLUS i got a guy that lives by me that has done a 1/2 bridge port on his T2. (corbit) his ports look really good and he said that he would be glad to help me out
I would really like to port the motor my self, but if u guys think that its going too hard to port my self then about how much is it going to cost to be ported?
i have done porting on my old 86 rx7 that i had that went fine i think that if iwere to take it slowly i bet that i could do it my self. PLUS i got a guy that lives by me that has done a 1/2 bridge port on his T2. (corbit) his ports look really good and he said that he would be glad to help me out
07-27-04, 04:43 PM
#23
built my own engine
more power to you then
the low end power is simliar to a street port because i am mostly on my primaries at that point, and the secondaries (bridged) open when i hit boost....
and it's all throttle based, because that's how the throttle body works, it doens't care if you're at 5k or 9k, if you're partial throttle, you're on primaries, so you get good vaccum (10mmHg) and good throttle response
smash the gas and it's game over
the low end power is simliar to a street port because i am mostly on my primaries at that point, and the secondaries (bridged) open when i hit boost....
and it's all throttle based, because that's how the throttle body works, it doens't care if you're at 5k or 9k, if you're partial throttle, you're on primaries, so you get good vaccum (10mmHg) and good throttle response
smash the gas and it's game over
07-27-04, 04:43 PM
#24
Originally Posted by RX7WEEE
93BlackFD U OWNED FDNewbie LOL!
Gosh...you kids on the forum. Such instigators...lol
