another motor question

[Guest polarity]

Well I've been asking alot of questions lately and I figure I might as well keep in stride with it.

 

I see different types of motors talked about on this site (crate & strokers being the most mentioned) I know what a crate motor is but I dont know what a stroker is? Anyone feel like clueing me in?

 

Thanks

Billy

[Guest Anonymous]

A stroker motor is nothing more than a crank or rod change or both on a particular motor to alter the cu in and stoke. The most common "stroker motor" is to put a sbc 400 crank in a 350 block. The change is not a simple bolt in build, but at the same time is not all that complex. This is a very brief description and maybe someone will get a little more specific, but gives you a general idea.

 

Hope this helps

 

John

[grumpyvette]

here look these combos over, keep in mind that its the total combo that counts

 

http://www.ryanscarpage.50megs.com/combos1.html

 

heres some GENERAL TIPS on engine planing

things to keep in mind!

 

http://www.midfloridamotorsportsperformance.com/engine_size_stock_bore.htm

 

(1) your normally limited to makeing about 1.25hp per cubic inch of displacement unless expensive high rpm parts are used or power adders like nitrous are used the larger the engines displacement ,the easier it will be to make any power level, starting with a 283 or a 307 puts your at a distinct DISADVANTAGE compared to a 350 or 383, 400 size engine

 

(2)hp= torque x rpm/5252 so.....

400 ft lbs at 3000rpm=228hp

400 ft lbs at 5000rpm=380hp

 

get the IDEA, the higher in the rpm range you make max torque the higher your hp will average!

 

(3)looking at cylinder head flow numbers

((.257 x cfm at max cam lift x number of cylinders = hp POTENTIAL))

so...you can normally make ABOUT a MAX POTENTIAL HP of

411hp with heads that flow 200cfm

514hp with heads that flow 250cfm

617hp with heads that flow 300 cfm

 

(4)all parts in an engine MUST be matched as to the ONE rpm range that your trying to make max hp in..... if you mis-match the rpm range of the parts the results will be far lower than the lowest rpm level of the least effective parts!

(5) by far the most comon mistake is buying DEALS on parts that don,t match the rest of the parts in yout engines rpm range or not matching all the parts in the engine to a planned rpm range

(6) the cross over point between useing a dual plane intake and a single plane intake is approximately reached at 3500 rpm and 230 deg@.050 cam durration or put another way if your engine spends almost all its time below 3500rpm and your cam has less than 230@.050 durration a dual plane intake will work best, if you spend almost all your time with the engine spinning OVER 3500rpm and your cam has more than 230@.050 durration a single plane intake will be best. this of course assumes your smart enough to know that the cam durration must also MATCH the ENGINES intended RPM RANGE and youve matched all the parts to the cams rpm range(the cam is the brains of the engine and determines what rpm range all the other parts should match, so FIRST PICK the rpm range/hp goal,

pick heads that flow enough air to meet that goal,

pick a cam that matches that goal

and pick all the other parts to match the heads and cam

 

here this will give you new guys some basic info

 

 

cams

 

http://www.newcovenant.com/speedcrafter/tech/camshaft/1.htm

(theres 10 lessons ., read them all)

 

http://www.howstuffworks.com/camshaft1.htm

intakes

http://victorylibrary.com/mopar/intake-tech-c.htm

 

compression,

http://victorylibrary.com/mopar/cam-tech.htm

 

oil

http://www.micapeak.com/info/oiled.html

 

pistons/rods

http://www.babcox.com/editorial/us/us20114.htm

 

http://victorylibrary.com/mopar/rod-tech-c.htm

 

http://www.engr.rutgers.edu/~llongo/8K.html

 

headers

http://www.geocities.com/MotorCity/Track/6992/vizard.html

 

http://www.ssheaders.com/header.htm

 

hp/torque

http://www.carcraft.com/editorial/article.jsp?id=868

 

basics

An internal combustion engine burns a mixture of fuel and air in an enclosed space. This space is formed by a cylinder that's sealed at one end and a piston that slides in and out of that cylinder. Two or more valves allow the fuel and air to enter the cylinder and for the gases that form when the fuel and air burn to leave the cylinder. As the piston slides in and out of the cylinder, the enclosed space within the cylinder changes its volume. The engine uses this changing volume to extract energy from the burning mixture.

 

The process begins when the engine pulls the piston out of the cylinder, expanding the enclosed space and allowing fuel and air to flow into that space through a valve. This motion is called the intake stroke. Next, the engine squeezes the fuel and air mixture tightly together by pushing the piston into the cylinder in what is called the compression stroke. At the end of the compression stroke, with the fuel and air mixture squeezed as tightly as possible, the spark plug at the sealed end of the cylinder fires and ignites the mixture. The hot burning fuel has an enormous pressure and it pushes the piston strongly out of the cylinder. This power stroke is what provides power to the car that's attached to the engine. Finally, the engine squeezes the burned gas out of the cylinder through another valve in the exhaust stroke. These four strokes repeat over and over again to power the car. To provide more steady power, and to make sure that there is enough energy to carry the piston through the intake, compression, and exhaust strokes, most internal combustion engines have at least four cylinders (and pistons). That way, there is always at least one cylinder going through the power stroke and it can carry the other cylinders through the non-power strokes.

 

http://www.howstuffworks.com/engine.htm

 

if you remember nothing else remember this,as a general rule it costs about the same to build most sizes of small block engines and since your total power output will be somewhat based on the engines size building a 383 or a 406 makes more sense than limiting yourself to a 283-350 size engine and most of the power your engine will produce is in the cylinder heads and cam combo you pick and matching the intake system and headers to those two parts