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Gentlemen, I've been trying to find a reputable source for the cause of this but I'm having little luck. There seems to be a well known idea that running an engine with just open headers or just a collector with no long exhaust will eventually "burn the valves." The idea is that they warp and...

Thank you for the all the suggestions. I've learned that the laser etchers are using a delicate rotating table so there are weight limitations to the device. I think we will go with a mini lathe chuck with three stepped jaws like some of you mentioned. Cheap and simple. Thanks again.

Is there a device that can grab a 3" aluminum pipe from the inside? It would be like a chuck that expands to hold it from the inside. The purpose of this is so that we can rotate it and laser etch the outside. Thanks.

So anybody want to shed any light on the original topic? Do we want pressures in the port to be as high as possible by keeping flow velocity as slow as possible, by using large ports? Or is the port size more dictated by valve area and doing back calculations to arrive at port size, then...

Ignoring pulsation effects and assuming a steady inviscid incompressible flow, old Bernoulli says pressure loss is required to accelerate still air (outside the air inlet) to whatever inlet pipe flow velocity is needed for the engine at a specific RPM. Now I read volumetric efficiency being the...

Even though this is coming from Nord-Lock's website, I found their video to be pretty informative - it shows bolt tension drop off with vibrated joints. They test their system against spring washer, nyloc, deformed thread, and even double nut. All of which lost tension with vibration. I guess...

Fabrico, you and shenanigans are both right. You consider "downforce" to be the combined force that the rider feels in his downward direction. Others consider downforce to be the vertical component in an outside frame of reference. If a unicyclist was riding around on a giant bathroom scale...

vonlueke - I couldn't find that information (metric wrench opening tolerances) in the MH I just ordered. Is it in there? What I did find in the MH for inch wrench opening tolerances is the methodology used to calculate their numbers. Min opening = 1.005W + 0.001in Max opening = 1.01W + 0.005in...

I am always impressed with the expertise people like to share on this board regardless of how relevant it is to the original topic (just kidding guys). Thanks for the useful information - I'm adding the Machinery's Handbook to my must have's.

btrueblood, thanks for the helpful post - exactly what I was looking for.

When a bolt head hex is designed for a 3/8" wrench - which is supposed to be 3/8" (the bolt hex or the wrench) and what is the standard clearance/tolerance?

"Or they use the same ducting as stock but instead of going into the stock airbox with a plate type filter, air goes into a can with a cone filter (where's the benefit?)." Sometimes intakes will incorporate a air horn, or velocity stack, at the end of a pipe, and will attach a big cone filter...

How so?

Greg, You're talking about situations where the tires are way beyond optimum slip angles. For subtle, mid corner adjustments on the track, if you want to tighten up just a little, you let off or apply just a tad of braking, to lift the rear end induce slight rotation. Pilun

With regards to braking leads to oversteer, accel leads to understeer. Provided you're not locking the brakes or spinning the tires, this is true. If turning in a circle on a skidpad near the limit, an application of braking will tighten up the car (ie make it turn in more), just like letting...

Focus on getting colder air. The dirty half of the airbox is likely not the main source of pressure loss. Why don't you just buy a cold air intake?

But you could use a convergent/divergent nozzle in the exhaust tip and point it at your competitor's car so that his engine sucks in your exhaust. Pole position!

Tim, If the subject was balancing OEM wheels, I'd say balance by the hub hole. In cases where people are concerned about hub-centricity, such as the OP, it is because they have aftermarket wheels with over-bored hub holes - and are questioning the function of hub adapter rings (rightly so...

Tim, Even if the hub hole is the true center, and the lugs are off by a small amount - wouldn't you still want to balance it to the lugs, since installation dictates centering about the lugs, not the hub hole? In otherwords, balance it the same way it would be installed and used. Pilun

The wobble comes from large mechanical trail with no castor (angle of pivot line). To simplify, imagine the force on the wheel always pointing towards the rear. Then it acts very much like the classic pendulum with a longer arm leading to slower frequency. Positive castor (upper pivot behind...