Just curious...

[cammerfe]

Agreement and added thoughts

btw... I agree... I've had mine for a little over a year, and I just find myself wanting a touch of a growl when I get on the gas.

But, I'm of the mindset that as a luxury sports sedan... it shouldn't be a loud rumble. So here I am, over a year later, still debating on changing the mufflers or pulling the resonators. Worried that what I do will end up giving it too much sound. I'd rather have not enough, than diminish the classiness of the vehicle with too much.

Maybe Gibson has some mufflers; their exhausts are pretty quiet...

I'm completely in agreement with your thoughts on sound. After all it is a Lincoln. I'm satisfied with the audibility of the Magnaflow cat-back system and the LSK induction system as a combination. When I put in the 4.0 Jag engine, I'll leave the cats off and build pipes to fill in. That'll probably make it somewhat louder when 'on it' but that's all right. The Magnaflow 'X' smooths out the exhaust pulses and removes the raspy component in what you hear. And a pair of turbos instead of the mufflers will make things even more interesting.

By the way, as general info, in performance you're looking for approximately 70%-80% of intake flow for the exhaust. That is when you are doing flow-bench work and 'massaging' the intake and exhaust tracts in the head. Then you extend that comparative flow on outward through the entire intake and exhaust systems. 'Balance' is not 50-50.

KenS from Ben's Place

 

[NateRW21]

I'm completely in agreement with your thoughts on sound. After all it is a Lincoln. I'm satisfied with the audibility of the Magnaflow cat-back system and the LSK induction system as a combination. When I put in the 4.0 Jag engine, I'll leave the cats off and build pipes to fill in. That'll probably make it somewhat louder when 'on it' but that's all right. The Magnaflow 'X' smooths out the exhaust pulses and removes the raspy component in what you hear. And a pair of turbos instead of the mufflers will make things even more interesting.

This is exactly why I ran an H-pipe on my truck; I know X-pipes generally make for more power, but I love the sound of an H-pipe!!! (given the right vehicle of course!)

By the way, as general info, in performance you're looking for approximately 70%-80% of intake flow for the exhaust. That is when you are doing flow-bench work and 'massaging' the intake and exhaust tracts in the head. Then you extend that comparative flow on outward through the entire intake and exhaust systems. 'Balance' is not 50-50.

KenS from Ben's Place

Of course... and that's just my point; in his application... as you said; it's like inhaling through a straw then. And the ability to maintain that exhaust gas velocity anything short of 6000rpms would be non-existent.

Like pumping water through a hose; if you want to keep that water flowing at a certain pressure, or velocity... it takes very little water when you're pushing it through a hose with an ID of 1/8". Open that hose up to 8" and effectively you need 64 times as much water to keep the same velocity.

Anyhow, I think people often misinterpret exhaust velocity for back pressure; a well tuned exhaust will allow for a small negative pressure area to build up in the exhaust port. This is accomplished by length, diameter and many other factors. Back pressure is a restriction to flow that is so much where instead of continuing on its path, it will actually push back up into the primaries and exhaust ports of the other cylinders. Some earlier cars, to the point where exhaust would come out the carb, get pulled back in and essentially see double fueling the air charge. In this situation, opening up the exhaust and eliminating this back pressure without adjusting the carb left you in a severe lean condition.

Anyway!!! The key is to restrict (or contain) the movement of the exhaust gases enough to maintain a good velocity, while keeping back pressure at bay. That's basically why equal length long tube headers are so effective. Now there we go... if anyone wants to get crazy on exhaust mods... i want to see some equal length long tubes!!!! (ceramic coated naturally!)