Classic Mustangs (Tech)Technical discussions about the Mustangs of yester-year.
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everyone either wants to upgrade their carb or has done it. same with exhaust. this lesson may seem a little wierd but it may help some of you understand why not go too large but to keep it big
First off, fill a large glass of water. Trust me . Take a small coffee straw and suck some up...you'll see you can only get so little so fast. Think of your mouth as the engine and the straw as a small carb.
Next, take a larger straw, say normal size found anywhere, snd suck again and it will go at a decent rate and at a rate that you can still swallow without drowning yourself.
If you take a huge ass straw the size of your mouth, you may not be able to get anything to your mouth.
Now exhaust, same principle but backwards. Take the small straw and blow on the water, you see it move a little in the concentrated area, wooptie do, however you can probably keep blowing for a prolonged time due to the amount of backpressure, this is bad, too much back pressure on an engine creates problems.
The medium size straw will blow more air and still allow a little backpressure so you can keep blowing and the engine will actually gain torque and horsies while being able to exhale properly.
As for the big arse straw, the air only reaches as far as you can blow and may barely move the water at all. Plus due to the lack of backpressure you run out of air rather soon. This shows that with too big of exhaust, say anything over 2.5" for you small block boys like me, will end up losing power.
Now this is a little wierd but everyone keeps asking ?s like why cant i put a nice sized 600-650cfm on my 289...well you can, but you'd better make sure it has enough mods to need something that big.
if you all understand this, which i hope you do, maybe Soaring can move it to the FAQ for when more nubs come looking for this type of advice.
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You know you've found the right job when your boss drives a 5.0 and builds cobra kit cars.
Good info for beginners. So many people seem to think bigger is better and with carbs and exhaust it just ain't so. Like you stated, the size of the carb and the exhaust has a lot to do with your engines ability to utilize it, too much and you WILL actually get less hp. Gotta mix and match everything carefully - carb, cam, heads, valve size, compression and optimum back pressure in the exhaust. Lots of novices go out and buy a big Holley 4bbl, drop it on an otherwise stock motor and think they just gained gobs of power.
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SSBC disks all 4 wheels. Edelbrock carb, intake and cam. Aluminum driveshaft. new 3.25 Traction Loc, JBA headers, Centerforce clutch. 15x7 rims w/225 50 15's.
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explaining proper carb and exhaust size
. Take a small coffee straw and suck some up...you'll see you can only get so little so fast. Think of your mouth as the engine and the straw as a small carb.
