light flywheel + crankshaft

[henryhendrixx]

You have an entire crankshaft? oh man, i wish i could get one

[JayDM93]

I think you should drive it...... and not waste gas reving it up. PuS

[mbcyclery]

going from 650 to 7200 whilst NOT under load is a good way to spin your main bearings and seize them. think about the oil film shear strength..

[remytv]

@mbcyclery really? When was the last time anybody ever seized their engine while free-reving? Stop making things up.

[blown262]

@remytv

Free revving your engine is bad for the mains as mbcyclery stated. There is lack of compression in the cylinders, causing the crank to sit higher in the journals. When you rev an engine high and then let off, there is a near permanent vacuum in the cylinders, sucking the crank further up in the journals. When most cranks are engineered, they take into account the load to be applied when spacing the oil passages. Oil may not be present where it is required while free revving.

[remytv]

@blown262 There is vacuum present each time an engine is engine braking, and each time the piston goes through the intake cycle (every revolution, load or not). What you say makes no sense, and the lubrification system is RPM dependant, not load dependant. And as always, show me a real world case that an engine died from free reving, they always die under load. There's not danger whatsoever to free-reving and engine.

[blown262]

@remytv

You are just ignorant to how things are engineered. Free revving is bad for the engine simply because it was not designed to do that. Engines are designed to have a constant load applied, and free revving revereses the load and makes the load spin the engine. Couple that with my previous comment of the crank sitting in an abnormal spot and you have yourself something that an engine does not like. Next you're going to say superchargers don't have to be under any load to full boost right?

[remytv]

@blown262 It happens all the time that the load spins the engine while under compression braking, that's a standard way of driving a manual car, your argument makes no sense. Take a 1 piston engine for example, even under load the piston and crank will go through the intake and exhaust strokes, which basicly puts no load on the engine 50% of the time, only the weight of the flywheel keeps the rotation going during that time.

[blown262]

@remytv

You're argument would only be valid on a 1 cylinder engine.....And engine braking isn't exactly the best thing for a car. I drive a 6 speed LQ9 s10 and I very, very rarely engine brake. The "proper" way of driving a manual car is to RPM match so that you are making the engine turn the transmission gear shafts at the correct speed, instead of the other way around. The engine is there to do the work to get you moving; the brakes are there to stop you.

[remytv]

@blown262 Let's agree to disagree. You do know alot and you didn't resort to name calling. Let the viewers bring their own conclusions ;)

[blown262]

@remytv

Agreed haha

[sleeptyper]

Meh, stock 5-cyl Audi revs faster aaaaand tows another car at 3rd gear 600rpm :D

[sleeptyper]

Meh, stock 5-cyl Audi revs faster aaaaand tows another car at 3rd gear 600rpm :D

[hondanickx]

My stock D14 with stock flywheel revs the same. FAIL

[integraracer94]

u ever gonna drive it

[tom9665]

I knife my crankshaft on a daily basis.

[ambero25]

how much does it cost ??

[DoommHonda]

its home made .. 100CZK or 1liter alcohol

[TXmatrix2nr]

There lighter flywheels and crankshafts. Lighter flywheels are usually after market but crankshafts can be lighter by knife-edgeing to take weight off the counter-weights

[midgetmayo]

yes there is it's made of aluminum

[papaown]

this was either a joke, or a sign of true stupidity

[jayguy173]

theres no such thing as lightweight crankshaft that thing would brake into pieaces just flywheels

[Hezath]

Ever heard of a knife-edged crankshaft?

[PetanCivic]

Tak to je úplná paráda. Za ty prachy to snad stálo :)