portin for brab brab brab

[antnicuk]

Carl,
why  does MPG go through the roof with a bridge?,   its only letting a strip of air more than a street port into the engine,  if the primaries arnt done,(1/2 bridge) would it make mpg a little better than a full bridge?.  how bad are we talking on a 13b tubo engine compared to a street ported engine?

[MikeLMR]

bridge port = earlier opening = more overlap = more fuel blown/sucked out of the exhaust unburnt.

And for those that think turbo\'s don\'t F up engine notes ... http://media.putfile.com/LogansFDsmaller
(blatently ripped from here - http://www.rx7club.com/showthread.php?t=454580&page=2&pp=15 ) Interesting engine too ... Semi P-port  :yes

the turbocharged P-Port 3 rotor drag cars don\'t sound  half as good. The supercharged ones I\'ve heared sound nearly as nice though.

[Carl]

Hi Tony,
well the thing is that in my experience the fuel consumption goes up greatly,true,with tuning you can help it and by only doing the secondaries too,but it still is high,probably half a stock engines if you try to drive carefully depending on the port, but as "OldOne" said it does depend on how big your port is too.
If you are going to build a worthwhile port for power and not just the brap, then what happens is that your port opening duration goes up big time,think of how long that thin strip is open for,If you have more inlet timing then even on light throttle you tend to use alot more fuel as more air is entering the engine,this has to be the case also because of the very high overlap.The overlap contributes to the inlet charge being contaminated with exhaust gas.|This is mostly true with little or no boost and anything other than WOT.At WOT the whole engine becomes much more efficient and you get good scavenging from the exhaust ports,either by exhaust tuning in the case of N/A engines or the turbo helping to scavenge on boost.
There is much more to this,but if you would like to know more I can explain in more detail.

"OldOne" could you PM me? I would like to have a chat please.
Regards
Carl

[20B_boy]

"OldOne" could you PM me? I would like to have a chat please.
Regards
Carl

No he cant, he\'s not a member Carl. I think you\'ve seen Oldone\'s RX2? Tasty huh? :god

[Carl]

No he cant, he\'s not a member Carl. I think you\'ve seen Oldone\'s RX2? Tasty huh? :god

I think he can see my email address.
Regards
Carl

[asp]

Kriss,
the only downside to a bridgeport is that you will use alot of fuel,the consumption goes through the roof.
As "OldOne" say\'s a PP will do the same.
But if you want that sound then great!bring it on!
Regards
Carl

 :rollin bring it on, oh i will

[Brett]

I was only posting from my experiences, having never done any porting work on a turbo I didnt want to say yes it will deffo make this noise and behave this way etc
Oldone, you got any more pics of your car, sounds like you have a Class 1 toy there, and we all like our toys on MRC

[oldone]

http://photobucket.com/albums/a184/eradeklerk/RX2/   some pics i took this morning

[20B_boy]

Will have to try and pop over again soon bud, for a proper demo

Rich

[asp]

http://photobucket.com/albums/a184/eradeklerk/RX2/   some pics i took this morning

very nice motor.colour is cool

[oldone]

you know the entrance fee bud............

[oldone]

thanx for the compliment.....be cool to fly around the TT course or on the short circ on the isle

[20B_boy]

you know the entrance fee bud............

Yeah mate

[MikeLMR]

noice ... is that an oil filter on the tailpipe

[asp]

noice ... is that an oil filter on the tailpipe

yea i did,maybe to stop water n crap goin down the pipe,