is there anycompanies that make a light weight crank for a b18a? also would a light weight crx combined with a certain crank pulley make a noticable difference in power? thanks for the help!

 

do you mean lightweigh crankshaft pulley or crankshaft itself? if crankshaft itself why would you want a lighter one?
pulleys well look on ebay, and do search there are alot of em.

 

You may want to look at Scat crankshaft, they can do any kind of crankshaft, they are strong and light, but you may have to bust your budget, depending on what it is at the start!!

 

Call Castillo's crank service.

Castillo's Crankshaft Spec
Address: 14654 1/2 Firestone Blvd, La Mirada, CA 90638
Phone: (714) 523-0321


Good prices and EXCELLENT SERVICE!

 

to Castillos crankshafts just two doors down from me.... how convinient . great service and excellent work. wouldn't recommend anyone else.

 

do they cryo treat stuff?

 

Light weight crankshaft and pulleys don't add horsepower,they let the engine rev. quicker.Its kind of last on the list af things to make a street car faster.
Glenn

 

Just knife edge your current crankshaft and balance. It's probably a lot cheaper than buying an aftermarket one.

The knife edging will lighten the crankshaft.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NJIN BUILDR &raquo;</TD></TR><TR><TD CLASS="quote">Light weight crankshaft and pulleys don't add horsepower,they let the engine rev. quicker.</TD></TR></TABLE>

???

If you take weight out of the rotating assembly that means you're freeing up horsepower. You're not going to free up 50 horses with a lighter crankshaft, but you're still freeing up horsepower. The power used to turn a heavy crankshaft is now being used to turn the wheels.

You're right, you aren't "ADDING" any hp, however you aren't just letting the engine rev quicker cuz it sounds cool either.

Ratliff

 

Horsepower is one thing, inertia is another.HP is a measured number (torquexrpm divided by 5252) and doesn't consider the weight of parts or acceleration.To go one step further a flywheel that weighs 20 lbs and is 10 inches in diameter will accelerate slower than one that weighs 20 lbs and is 5 inches in diameter.Chassis dynos use inertia to estimate hp and can show more hp by changing to lighter wheels.I think we can all agree that lighter wheels don't make more hp.Lots of things affect how "quick" a car is.
Glenn


Modified by NJIN BUILDR at 7:13 PM 1/10/2005

 

That is some good info Glenn.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bc_ef8 &raquo;</TD></TR><TR><TD CLASS="quote">Just knife edge your current crankshaft and balance. It's probably a lot cheaper than buying an aftermarket one.

The knife edging will lighten the crankshaft.</TD></TR></TABLE>

knife edging increases vibrations which can screw up the bearings and the water pump sooner than usually. itr crank is heavier then gsr crank for a reason to decrease the vibratiaaans.

 

That's one of the issues with inline four engines.Because of secondary harmonics the engines vibrate less with heavier cranks,but rev. quicker with lighter ones.In a drag only engine the engines are in that range for only seconds at a time.The nascar 'daytona dash" cars ran domestic 4 cylinders for years.If you want to know about how to keep the manifold from falling off, ask someone that ran one of these cars.I've never seen so many cotter pins and safety wire.The vibration must be incredible.
Glenn

 

Eagle sell some lightweight cranks for the B18A/B and the B20B/Z:

Be sure and scroll down the page

http://www.eaglerod.com/produc....html

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NJIN BUILDR &raquo;</TD></TR><TR><TD CLASS="quote">To go one step further a flywheel that weighs 20 lbs and is 10 inches in diameter will accelerate faster one that weighs 20 lbs and is 5 inches in diameter.</TD></TR></TABLE>

Correct, hp is measured.. torque x rpm / 5252 that's a known fact, however yout flywheel comparison is of apples to oranges. keep the same diameter flywheel and see which one accelerates faster... thanks. If lighter flywheels/cranks/pulleys didn't make a car go faster, they wouldn't ******* make them. END OF STORY.

Ratliff

 

And the reason your dyno test shows lighter wheels as an HP increase is because it is a torque increase at the wheels. The engine is generating the same amount of torque as before, however it is using more of it to accelerate instead of just being wasted to turn a heavy-*** wheel.

Ratliff

 

Lighten up.What I'm trying to explain is that its not only the weight of the parts that effects the rate that parts accelerate but were that weight is located from center.I believe its referred to "moment of inertia".Brake dynos,whether they are water or eddy current (electric resistance) actually measure torque.Most chassis dynos calculate torque by accelerating the drums that are of a known weight, they don't actually measure torque.Because of this, other factors like light rotating parts effect the hp readings.This is part of the deal with different hp on different make dynos.And once again lighter may let a car accelerate faster but its not because it makes more hp.
Glenn

 

What you are saying is a good analogy but it is backwards.
The small diameter weight (5 inch) will accellerate faster than the big diameter one (10inch)
Go outside grab a bucket tie a string to it, fill it with water and swing it around.
The shorter the string the easier it will be to swing it around.


Light cranks, pulleys, and wheels....

HP is a measurement of work done over time. Less weight means that the same work is done quicker = more hp.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NJIN BUILDR &raquo;</TD></TR><TR><TD CLASS="quote"> To go one step further a flywheel that weighs 20 lbs and is 10 inches in diameter will accelerate faster one that weighs 20 lbs and is 5 inches in diameter.Chassis dynos use inertia to estimate hp and can show more hp by changing to lighter wheels.I think we can all agree that lighter wheels don't make more hp.Lots of things affect how "quick" a car is.
Glenn </TD></TR></TABLE>

 

Nah nah I'm not trying to be a dick. lol. I'm just stating that the 2nd half of this:
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NJIN BUILDR &raquo;</TD></TR><TR><TD CLASS="quote">Light weight crankshaft and pulleys don't add horsepower,they let the engine rev. quicker.</TD></TR></TABLE>

Is false. The lighter parts arent there to make your engine rev faster and sound cool, they're there for less rotational weight, and therefore making the car accelerate faster. NOT to be a *bling bling* riceboy.

Ratliff

 

You are right,I reread that three times and still posted it backwards.A part of equal weight that is smaller in diameter will accelerate faster.
Glenn