ok, i have been doing some research:

and i dont know if all of what i have correlated is correct so if somebody could please correct me or confirm my thoughts that would be great.

ive come to learn that speed is caused by a faster spining wheel. This is obvious. to increase the speed you need to increase the toruqe of the vehicle?

i figured that an easy way to do this is to increase the gear ratios of the vehicle. the input i would say would be the engine gear and the output would be the gear connected to the drive shaft (or whatever it is that turns the wheels)?

so if the gear ratio of the input (engine) is a % larger and the gears connected to whatever is turning the wheels is a % smaller then in theory you would get more torque?

also i was looking into CAM's which i beieve control the valves that allow air in and exhaust out?

if i were to adjust or get a new performance CAM that would optimize the amount of air that would be able to go in i could get more compression and combustion out of the engine and also teamed with the correct cold air intake and exhaust system it would get me more explosive power in the pistons?

and if i have more explosive power in their i would be able to put more power into the input gearing (engine) and thus more into the output causing more torque and a faster vehicle?

also i was looking into some bore and stroke idea, i believe this is what contains the explosion of the engine? if i were to have more volume in their i could put more in their and get a higher explosion and if i were to make them closer together i could get more compression and more explosive force?

i do not think this is necessary at the moment because i think that the other things i have discusses would increase performance

please correct me if i am wrong on these things and confirm it if i am correct

this would be much appreciated!!!



cory

 

Yea , ok - uhmmm.. Sorry, your post put me to sleep

Correct!! - from what I've read..

 

Stay in school,,,lol.

 

Get a copy of the Ford Powertrain Manual off ebay and study the theory of operation for a better understanding of how things work.

 

Speed is caused a spinning wheel....period. A faster spinning wheel is caused by acceleration.

Yes, by pressing down further on the acceleration pedal.

That would increase output torque to the rear wheels, yes, but you can go too far and have a high amount of torque but you would get to the point where your engine simply runs out of breath and cant spin any further thus limiting your vehicle speed. In other words, you would reach your max speed much faster but your max speed is lowered from stock if you gear too large a ratio. example: 3.55:1 stock then going to 4.88:1. Could climb a mountain but might have a hard time beating a Geo Metro at both vehicles' top speeds. Theoretically.

I assume by engine gear you mean the transmission output, and the gear that is turning the wheels is the Ring Gear which is driven by the pinion gear that is pressed onto the input U-joint of your rear differential. Reading that statement above you are almost there. You would need to increase the ratio of both the tranny output and the differential ratio to get more torque. But then again....at what top speed cost? There is a balance for top speed and the ability to get there fast. I had a friend with a 1960 chevy that had 3.08:1 gears. His car could do 160 miles per hour, but it took him about 3 to 5 miles to reach that top speed because the engine had to work so hard to move the car. If his ratio were, say, 4.10:1 he would hit his top speed faster but his new top speed would be lower than 160 mph, maybe 125 mph.

Dead on.

No adjustments to be made to cams. You would have to get a new cam grind to increase the time duration of either the intake or exhaust valves. A longer open time would allow more air in versus stock so you would be essentially raising the amount of air you are compressing. As for a correct CAI and Cat-back exhaust, all about your preference. If you went to 100 performance shops, you would get many different answers on what products to install but overall you might hear one brand or two the most and tend to lean that way. Research at will on this site to hear what most are doing.

well...yea


The bore and stroke x number of cylinders dictates your engine displacement. Yes, an increase in volume and compression would yield more HP and TQ output. What do you mean by getting them closer together?

They would, if done to what your goals are and based on what you have right now.


Oh don't worry, we will!!

Have fun.

 

lower gears will NOT put more torque to the wheels, just feels like more

 

Uh, no. If torque was the key to speed a Peterbuilt with a V10 CAT would blow the doors off of a new Bugatti. Torque equates to pulling power. Horsepower equates to speed. There is also the factor of diminished returns. Depending on the application, doubling HP may only net you extremely small returns. Case in point would be a jet boat. Getting to 60 mph is fairly easy, getting to 120 requires extreme amounts of HP and doubling HP won't get you but maybe 10-15 mph faster. A 500 HP gas engine in a Peterbuilt won't pull a normal load for the rig wheras a 300 HP diesel with 800 lbs torque pulls it with ease. If you go up on tire size and you want to increase speed, you have to go up on both HP and torque. Make sense? If you are looking to build a rig of any kind you don't start with the engine, you start at the back tires and work your way forward. Once you know the tires size, determine the axle ratio which depends on the transmission. Now you know what the requirements are for the engine you need to build. Most street folks do just the opposite and wonder why they get beat by much smaller but better thought out vehicles.

 

RES: is their a way to calculate the most efficient way to get the most torque without stressing the engine as you say?
RES: ok so the torque would be multiplied but the max speed would be achieved faster but it would not be as fast, im not quite understanding this one could you explain it
RES: yeah thats it
RES: i dont understand why it would be less, is it more strain on the engine or something?
RES: this relates to enging power or HP?
RES: well for example my borexstroke is : 3.81x3.74 so the distance between them is: .07 if their was a way to make that number smaller it would increase the cobustion but i dont think that would be a good idea

 

Your getting their bud. Everyone will help you out and throw some correction out your way so you will be on the right track. I also would suggest maybe taking an autoshop class or two. Have a teacher stand up in front and tell ya the basic concepts behind a vehicle / drivetrain. One thing I have to say is: there is no explosion inside your engine. If you have an explosion, something is wrong and you will here.... bad... noises. What you are talking about is called the "ignition" stroke. The fuel and air ratio is just right to be cumbustible (not explosive) . Thats when the spark plug fires and CUMBUSTS (not explodes) and instantly ignites all fuel inside the compartment. Since the fuel is igniting and being burned, heat is being created (at a very fast rate) and hot air is much LESS dense then cool air (requiring more room), so the heat naturally needs to expand... thus pushes your piston down... and viola! Keep it up bud! Not many young guys wanting to learn much about cars anymore. Its nice once in awhile to see someone with some interest. If you have more questions... just ask. Some guys may sound like wise ***'s, but read what they say, they are actually trying (in their own way) to help. Good luck bud, keep up the learnin!

 

and could you please use "there" instead of "their" when proper?

 

Well, I never said you would stress the engine, only that it would run out of breath. Take a look at your tachometer and watch it go up and down based on accelerating and de-accelerating. You have an idle rpm and a redline rpm and lots of rpm's in between. That is what you have to work with. You dont want to get into the redline area for too long, or at all for that matter since that is a lot of moving mass held together by your block and valve assemblies.
You need to set realistic HP and TQ goals in mind and look at the ways and $$$ to achive them, and never, ever forget to get your truck tuned properly based on modifying from stock.

see above. The best way to make your vehicle fast is to work with both the engine and the driveline to make use of the rpm range you have so that the engine puts out adequate HP and TQ thru the gear range so that you can pull high rpm's in most likely 3rd gear on a 4-speed auto.


Try this experiment. Get on a 10-spd bike and shift to 1st speed. Pedal. Feels like you can pedal with ease uphill or on rugged terrain but you wont go fast. Now shift all the way up to 10th speed. Feels like you need Incredible Hulk leg muscles just to even move the bike. Sort of how your engine sees the vehicle load at any time. Also what I said above. You have an rpm range to work with and putting a higher value gear ratio in the rear differential will let the engine breathe better and pull better but that same higher value ratio will also lower your overall speed. Pedaling in 1st speed vs 10th speed on a bike.

Yes.

OMG. Your bore is the cross section I.D. of your cylinder. Your stroke is the distance traveled by the piston in the cylinder which is dictated by the engine crank. A larger bore will help pull in more air on a normally aspirated engine thus helping HP alot. A longer stroke would increase TQ assuming you don't damage anything. You would have more luck in safely increasing the bore than you would for the stroke. Increasing the stroke would raise compression but you can only go so far before you would blow valve assemblies to the clouds!!

As for explosion in the cylinders(another post in this thread), I believe that is about the same meaning as combustion or at least close. I think it is detonation you are referring to and that is a bad thing.

 

explosion is detonation. Its isn't an explosion, it is a rapid expasion of heat. Its closer to a fire then an explosion. You want a good steady full burn... not an uncontrolled, instant explosion. Its isn't that big of a deal, any mechanic would know what you are talking about, but im just helping with the correct terminology.

 

damn them are some long replys.. ill read it later seems like u guys got it covered

 

Well, each person understands things a little different. I would say, from my point of view, that combustion is a controlled explosion of something, and detonation is an uncontrolled explosion of something.

 

You see the full range of knowledge folks.
Many make the mistake of saying the mix explodes when the proper term is 'combustion', nothing else unless talking about a problem with advanced timing , hot spots, lean mixtures and low octane.
As for the guy who said gearing does not supply more torque to the wheels, shame on you.
Given no other changes but a reduction in rear gearing, how do you think acceleration is affected? If not then a lot of people are waisting their money by using lower gearing for towing etc.
Many people think gearing changes HP, it does not because it is a static change that can't by it'self make any power but only leverage power changes existing from the motor.