SHOmethewayhome
BAD ROLE MODEL
I like this answer.
I'd like it even better if you send me a case of that delicious pumpkin beer you guys make come october.
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- Thread starter zach44102
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I like this answer.
I'd like it even better if you send me a case of that delicious pumpkin beer you guys make come october.
Thats why SHO get louder when you remove the horns, this pressure wave is no longer trapped in the intake runner and enters the plenum
http://www.downingbrothers.com/supercharger/tuned-intake-runners.htm
I would bet the aiflow you gain from BBBs is off set from the loss of tunning when you get rid of the air horns
http://www.downingbrothers.com/supercharger/tuned-intake-runners.htm
I would bet the aiflow you gain from BBBs is off set from the loss of tunning when you get rid of the air horns
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Punkin is easier to get then 120 IPA right now, Im having a hard time getting even a 4 pack of the stuff and I work there !
Thats why SHO get louder when you remove the horns, this pressure wave is no longer trapped in the intake runner and enters the plenum
http://www.downingbrothers.com/supercharger/tuned-intake-runners.htm
I would bet the aiflow you gain from BBBs is off set from the loss of tunning when you get rid of the air horns
Interesting graphic. There was some before/after chassis dyno testing of a stock intake w/ and w/o horns in the SHOtimes era. Removing the horns caused a loss of 1 ft-lb of torque and added 1-2 hp (e.g. within the error limits, so no significant change). On the other hand, properly port matched BBBs (including removing the innermost rubber from the coupler ID) have always shown a 10 hp jump.
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ShadetreeSHOguy
Postwhore
Car has to be running to see this hp change Sack 
I would love to see some numbers of a BBB set up with a set of BB matching horns, I tried this a while back by installing a set of mandrel bent horns in the stock plenum but there was no way to install them with a proper bell mouth.... with out cutting out the side , installing horns and welding it gack up.
I had to settled with a simple set of extensions that just got the port out into cleaner air, they are bell mouthed but its hard to see in this pic...
Some one needs to build a custom set of tanks with BBB and proper horns and see what the number are.
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Nova, there was a fellow on here that was reverse radiusing the ports in the plenums, to create a better transition into the primary and secondary runners/BBBs.
Nice work on the bellmouths. Maybe some kind of removable plate could be machined into the plenum at the butterfly interface, or maybe study the techniques used to build model boats inside bottles . . . . .
Nice work on the bellmouths. Maybe some kind of removable plate could be machined into the plenum at the butterfly interface, or maybe study the techniques used to build model boats inside bottles . . . . .
Denny
Taurus Homeland
I would love to see some numbers of a BBB set up with a set of BB matching horns, I tried this a while back by installing a set of mandrel bent horns in the stock plenum but there was no way to install them with a proper bell mouth.... with out cutting out the side , installing horns and welding it gack up.
I had to settled with a simple set of extensions that just got the port out into cleaner air, they are bell mouthed but its hard to see in this pic...
Some one needs to build a custom set of tanks with BBB and proper horns and see what the number are.
What's for dinner?
SHOtime2511
CGP
Too much work for too little gain.
if you want easy HP for cheap build a small block chevy. For the same amount of money I have in my 285 HP 3.2 sho I could have built a 500 HP 383 chevy
StreetlightSHO
It'll run eventually...
So if the horns are used to "bounce back" air at the intake valve as it is opening and the length of the runners are tuned so that this wave hits the valve at the right time, then porting your runners would then affect this. Since the CFM in the runners is based on RPM, would porting just change the RPM that this "bounce back" occurs at?
But in the end I'm guessing this barely affects engine performance.
Just trying to get a better understanding of it.
But in the end I'm guessing this barely affects engine performance.
Just trying to get a better understanding of it.
SHOmethewayhome
BAD ROLE MODEL
SHOmethewayhome
BAD ROLE MODEL
pshh... you could do better, that thing is FWD AND has stacks.
SHOmethewayhome
BAD ROLE MODEL
but yes, thanks for once again adding to my longtime belief that chevy fans and small blocks are like retards on ******, they'll jam it into anything no matter how hard it is.
So if the horns are used to "bounce back" air at the intake valve as it is opening and the length of the runners are tuned so that this wave hits the valve at the right time, then porting your runners would then affect this. Since the CFM in the runners is based on RPM, would porting just change the RPM that this "bounce back" occurs at?
But in the end I'm guessing this barely affects engine performance.
Just trying to get a better understanding of it.
its the length of the intake runner that impacts the resonance frequency of the air column, not the diameter or smoothness. of course, the diameter and smoothness affect how much air flows through it, but the frequency is due to the length.
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