59MM Throttle body

[StormTec2.0]

Originally Posted by sleepyalero

How did he make you mad?

I prefer not to talk about it in here as it will start more stupid $hit. PM me if you wanna know brother

[sleepyalero]

Originally Posted by StormTec2.0

I prefer not to talk about it in here as it will start more stupid $hit. PM me if you wanna know brother

Smart move, and understandable. You sir have a PM.

[AaronGTR]

Originally Posted by Bryle James

Basically to increase throttle body size for more air, there will need to be a lot of other supporting mods to fully maximize the potential of it. Think of trying to funnel a large amount of air through a small tube, cut and joined in three sections. Expand the first section, but it's still going to bottle neck at the smaller, middle section. Expand all three sections, then you'll have a much more efficient air flow.

This guy gets it!
Basically without modding the entire intake and exhaust tract you aren't going to move a significantly great volume of air. You need things like ported heads and a cam as well. Or boost. Those things change the volumetric efficiency. Otherwise you are just gaining power by reducing pumping losses. Not by getting more air into the cylinders.

Originally Posted by StormTec2.0

Never said i knew everything about a Grand Am or tried to act like i knew everything about a Grand Am. I said I know my Grand Am's pretty well. I hate when people put words in my mouth.

Milzy headers are next even tho he pissed me off recently I like his headers from the reviews iv seen

Well, no one knows everything, but I've seen you and lots of other people on here make incorrect, uninformed statements like the first comment. Then I have to spend my time contradicting them and trying to educate people about mods so they don't buy worthless crap that won't help them.


Like I said, you need to research volumetric efficiency. Basically it's the engines ability to take in air compared to the total volume of the cylinders. Imagine an engine with no cylinder heads on, and the pistons moving up and down. There is absolutely nothing blocking the air, so the cylinders with be completely filled on each revolution. This would be 100% volumetric efficiency (VE). Of course real engines very rarely approach this theoretical number, and never in NA form. In order to create compression and power, there has to be cylinder heads. To get the air in and out you have to have intake and exhaust ports, valves, camshafts, intake and exhaust, etc etc. All this creates air friction and reduces the amount of air the engine takes in. When the piston moves down it creates suction. The valves open and pull air through the whole intake. If the pistons were moving slow, the air would move slow also, there would be less friction, and the cylinder would get completely filled. The pistons have to move fast to create power though since HP = torque x rpm. Since they move fast the piston creates greater suction, air speed and friction increases, and thereby resistance. The cylinder doesn't get completely filled and there is actually vacuum in the cylinders when the compression stroke starts before the intake valve closes. Engines are basically air pumps. Some of the power they make is lost to mechanical friction, and some is lost by the power required to pump the air in and out (a lot of fuel energy is lost to heat, but that's another topic). You can gain power by reducing those pumping losses without significantly changing the VE. If you modify enough of the intake/exhaust tract to significantly reduce air friction, you can get more air in the cylinder and change the VE. If you change the cam shaft you change how fast and how much the valve opens and for how long, and that significantly affects the VE. That also is why a cammed car requires more tuning. But you won't make a really significant power increase without either a fully modded intake/exhaust and a cam, or boost or nitrous.

[AleroB888]

[Bryle James]

Originally Posted by AaronGTR

This guy gets it!

Hooray for noobs!

[locoman99]

The biggest mistake most make in engine modifications is at the start.
After you decide you are not going to boost an engine, your very next decision should be selecting a cam profile. All part selections are dependent on the camshaft profile.. Valve timing is the overriding factor in what you want out of an engine.

[bricooper78]

Who was testing that AleroBBB? Surely that wasn't something GM actually did, was it?

[AleroB888]

Originally Posted by bricooper78

Who was testing that AleroBBB? Surely that wasn't something GM actually did, was it?

The magazine, "High Performance Pontiac," back in the day

http://www.highperformancepontiac.com/

After searching an old thread on here, I'm bummed out because I thought I had the first set of TOG headers made for the 3400, but the original set John (APOC) had were "nickel coated" not ceramic like I have