Technical Question Game

Speed_Demon · 12-27-2006, 01:26 PM

Answer the question correctly then ask one of your own. I'll start it off.

Why do most manual transmission vehicles whine in reverse?

ecotechjosh · 12-27-2006, 01:47 PM

because reverse gear is a spur cut unlike your forward gears which are helical cut. The whining is caused because a spur gear has straight teach as opposed to the helical gears which have helically cut. This allows the idler gear to make your car go backwards....

Next Question;

What car actually uses a muffler bearing?

Speed_Demon · 12-27-2006, 02:10 PM

Some cars use bearings in flaps in the muffler to change flow. Example BMW e36, some mercedes cars, and the african built toyota yaris. Is this right? I won't ask a question until I know I'm right.

ecotechjosh · 12-27-2006, 02:38 PM

Nope the car has a part actually known as a Muffler bearing

Speed_Demon · 12-27-2006, 02:39 PM

Is it the junction in an old VW exhaust?

ecotechjosh · 12-27-2006, 02:40 PM

Very good

On the VW Baja it was a junction that allowed water drainedge haha because the exhaust tip stuck up at a verticle angle which allowed alot of water to get into it when it rained hehehehe

Speed_Demon · 12-27-2006, 02:43 PM

Alright then here I go. Do valve clearances tighten or loosen between valve adjustments?

rider X · 12-27-2006, 03:06 PM

Motorcycle or Car? Most cars are self adjusting and use roller rockers so no clearance is serviceable.
Motorcycle most of the time the clearances become loose and that is the tapping you hear. But I have on some occasions seen tight exhaust valves. Not exactly sure why, I heared at MMI that the exhaust valve shims grow due to heat, but did not make since, more like the shim was to tall and set up to tight in the first place.

Question:
How long should a sportbike tire be ridden on before being changed? and what are wear bars?

Speed_Demon · 12-27-2006, 04:01 PM

Originally Posted by rider X

Motorcycle or Car? Most cars are self adjusting and use roller rockers so no clearance is serviceable.
Motorcycle most of the time the clearances become loose and that is the tapping you hear. But I have on some occasions seen tight exhaust valves. Not exactly sure why, I heared at MMI that the exhaust valve shims grow due to heat, but did not make since, more like the shim was to tall and set up to tight in the first place.

Question:
How long should a sportbike tire be ridden on before being changed? and what are wear bars?

Sorry rider X but in normal conditions clearances tighten as the valve wears and pushes against the valve seat. I forgot to mention hydraulic lifters not applicable because they are not use in motorcycles today. My bad for asking a car question first.

You should replace your tire if is either down to the wear bars or reached its heat cycle limit or of course is damaged or cracked.

Why do two strokes typically put out more hp than four strokes of the same displacement?

oak · 12-27-2006, 04:30 PM

Originally Posted by Speed_Demon

Why do two strokes typically put out more hp than four strokes of the same displacement?

no loss cycle as there's a pumping loss in the otto cycle motor. two strokes pop every 360 degrees per cyclinder... ottos pop every 720 per cylinder resulting in a reciprocating loss on the exhaust stroke.

what's the name of a rotary (wankel) motor's equivalent to a crankshaft?

Speed_Demon · 12-27-2006, 04:39 PM

A wankel has a crankshaft and is called a crankshaft. Hmmm.... Are you talking about the rotor?

liquidsilver03 · 12-27-2006, 04:43 PM

why does ethanol produce more horsepower than gasoline, if octane is left out of the equation

Speed_Demon · 12-27-2006, 04:44 PM

Originally Posted by liquidsilver03

why does ethanol produce more horsepower than gasoline, if octane is left out of the equation

more btu's?

oak · 12-27-2006, 04:45 PM

Originally Posted by Speed_Demon

A wankel has a crankshaft and is called a crankshaft. Hmmm.... Are you talking about the rotor?

no. i'm talking about the shaft the rotor rides on that transfers the rotational force of the rotor to the transmission.

it's not called a crankshaft.

liquidsilver03 · 12-27-2006, 04:46 PM

wrong

oak · 12-27-2006, 04:46 PM

Originally Posted by liquidsilver03

why does ethanol produce more horsepower than gasoline, if octane is left out of the equation

higher rate of thermal expansion during combustion.

i thought this was a "answer one THEN ask one forum"?

Speed_Demon · 12-27-2006, 04:49 PM

Originally Posted by oak

i thought this was a "answer one THEN ask one forum"?

yes it is

was that the question?

liquidsilver03 · 12-27-2006, 04:50 PM

wrong, lol well was speeddemons answer correct, if it was then u can ask a damn question

kippen · 12-27-2006, 04:54 PM

Oak,

is it an output shaft?

liquidsilver03 · 12-27-2006, 04:56 PM

eccentric shaft, give or take on the spelling


12-27-2006, 01:26 PM	#1
Speed_Demon Superbiker Joined: Mar 2005 From: Brooklyn, NY I Ride: GSXR	Technical Question Game Answer the question correctly then ask one of your own. I'll start it off. Why do most manual transmission vehicles whine in reverse? __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 01:47 PM	#2
ecotechjosh Cavalier Champion! Joined: Jan 2006 From: Spokane I Ride: The couch...	because reverse gear is a spur cut unlike your forward gears which are helical cut. The whining is caused because a spur gear has straight teach as opposed to the helical gears which have helically cut. This allows the idler gear to make your car go backwards.... Next Question; What car actually uses a muffler bearing? __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 02:10 PM	#3
Speed_Demon Superbiker Joined: Mar 2005 From: Brooklyn, NY I Ride: GSXR	Some cars use bearings in flaps in the muffler to change flow. Example BMW e36, some mercedes cars, and the african built toyota yaris. Is this right? I won't ask a question until I know I'm right. __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 02:38 PM	#4
ecotechjosh Cavalier Champion! Joined: Jan 2006 From: Spokane I Ride: The couch...	Nope the car has a part actually known as a Muffler bearing __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 02:39 PM	#5
Speed_Demon Superbiker Joined: Mar 2005 From: Brooklyn, NY I Ride: GSXR	Is it the junction in an old VW exhaust? __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 02:40 PM	#6
ecotechjosh Cavalier Champion! Joined: Jan 2006 From: Spokane I Ride: The couch...	Very good On the VW Baja it was a junction that allowed water drainedge haha because the exhaust tip stuck up at a verticle angle which allowed alot of water to get into it when it rained hehehehe __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 02:43 PM	#7
Speed_Demon Superbiker Joined: Mar 2005 From: Brooklyn, NY I Ride: GSXR	Alright then here I go. Do valve clearances tighten or loosen between valve adjustments? __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 03:06 PM	#8
rider X Pit Crew Joined: Mar 2006 From: Spokane, Wa	Motorcycle or Car? Most cars are self adjusting and use roller rockers so no clearance is serviceable. Motorcycle most of the time the clearances become loose and that is the tapping you hear. But I have on some occasions seen tight exhaust valves. Not exactly sure why, I heared at MMI that the exhaust valve shims grow due to heat, but did not make since, more like the shim was to tall and set up to tight in the first place. Question: How long should a sportbike tire be ridden on before being changed? and what are wear bars? __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 04:39 PM	#11
Speed_Demon Superbiker Joined: Mar 2005 From: Brooklyn, NY I Ride: GSXR	A wankel has a crankshaft and is called a crankshaft. Hmmm.... Are you talking about the rotor? __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 04:43 PM	#12
liquidsilver03 Pit Crew Joined: May 2006 From: Tacompton I Ride: zx7	why does ethanol produce more horsepower than gasoline, if octane is left out of the equation __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 04:46 PM	#15
liquidsilver03 Pit Crew Joined: May 2006 From: Tacompton I Ride: zx7	wrong __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 04:50 PM	#18
liquidsilver03 Pit Crew Joined: May 2006 From: Tacompton I Ride: zx7	wrong, lol well was speeddemons answer correct, if it was then u can ask a damn question __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 04:54 PM	#19
kippen Pit Crew Joined: May 2006 From: Seattle Washington I Ride: SV650S	Oak, is it an output shaft? __________________ Follow PNW Riders on Facebook and Twitter


12-27-2006, 04:56 PM	#20
liquidsilver03 Pit Crew Joined: May 2006 From: Tacompton I Ride: zx7	eccentric shaft, give or take on the spelling __________________ Follow PNW Riders on Facebook and Twitter

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