NoPistons -Mazda Rx7 & Rx8 Rotary Forum

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-   Rotary Engine Building, Porting & Swaps (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/)
-   -   How much louder is Full Bridge vs. Large Streeport (https://www.nopistons.com/rotary-engine-building-porting-swaps-55/how-much-louder-full-bridge-vs-large-streeport-62056/)

2wankel 10-06-2006 10:51 PM
I would like to know the difference in loudness, lets say long primaries collected right before the axle into a muffler.

j9fd3s 10-07-2006 11:09 AM
it depends.... the bridge will make a lot more noise out of the intake



it is possible to make a bridge "quiet", or more like not loud

Rotoraider 10-07-2006 02:19 PM
it's a LOT louder... hard to decribe i suppose... maybe similar to the difference between a muffled exhaust and open straight pipes.

It's VERY loud.

heretic 10-08-2006 11:37 AM
I can't tell the difference between ports given the same exhaust system.



That is the trick right there.

Stanello 10-09-2006 12:06 AM
Really? I sure can.

j9fd3s 10-09-2006 10:50 AM
Originally Posted by heretic' post='840058' date='Oct 8 2006, 09:37 AM

I can't tell the difference between ports given the same exhaust system.



That is the trick right there.


the difference seems to be intake noise....

Jeff20B 10-09-2006 12:37 PM
I'd have to agree more with j9fd3s. While both porting styles can produce a nice brapping effect, only the bridgey sounds uniquely bridgeported, and it is heard mainly through the intake.

2wankel 10-09-2006 02:32 PM
What about the torque of a full bridge, how is caparable too? A stock port motor or worse?



thanks for your replies

j9fd3s 10-09-2006 03:37 PM
Originally Posted by 2wankel' post='840190' date='Oct 9 2006, 12:32 PM

What about the torque of a full bridge, how is caparable too? A stock port motor or worse?



thanks for your replies


its better! all the time!


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