Car engine quiz.

[gbdolfans]

Hi all,I don't know if this has been posted before.It is a fun little quiz on car engines.

Some of the questions are easy and some make you think.

It's about 40 questions long!!!

Give it a try!!!!

http://www.zoo.com/quiz/car-engine-quiz?mkcpgn=i600001572&utm_source=outbrain&utm_medium=paid&utm_campaign=Zoo-CarEngine(desktop)&utm_term=5365692&utm_content=Can+You+Take+An+Engine+Apart+And+Put+It+Back+Toget

Edited February 23, 2016 by gbdolfans

[landman]

Fun. Perfect  score. Some of the alternative answers took some imagination.

[unclescott58]

Disappointed! I missed two. Needed to read things more carefully.

[cobraman]

I missed one. I read it wrong. That's my story and I'm sticking to it !

[Deathgoblin]

Perfect score.    

[XJ6]

35 Correct out of 40 ?

[Roger U]

I missed one. :-(

[gino]

missed three.

[louie]

38 out of 40  and I am very surprised that I got that many right. I pretty much know what's what but plain and simple I'm not a mechanic. That was exellent stuff and thanks for posting it.       Jeff 

[Renegade]

Got 39 out of 40.

[Dragline]

Crushed it. But I did make a couple of educated guesses.

[bogger44]

38 out of 40.

[StevenGuthmiller]

Oops I missed one!

I'd be interested to hear which ones were missed by those of us that didn't get a perfect score.

My guess is either #2, the "Nickolaus Otto" question, or the one I shouldn't have second guessed myself on, which engine produces more torque. Gasoline, diesel or equal?

 

Steve

[ChrisBcritter]

Crushed it. But I did make a couple of educated guesses.

Same here (40/40) - confirmed a couple things I wasn't too clear on.

[Crazy Ed]

    Funny but Question 36 doesn't have a Correct answer listed as an option.

   The Question is Octane is...?. The listed as correct answer is - How much Gasoline can be compressed before it ignites. While Octane is the ability to resist Knock. But given the choices their answer was the best.

[Deathgoblin]

    Funny but Question 36 doesn't have a Correct answer listed as an option.

   The Question is Octane is...?. The listed as correct answer is - How much Gasoline can be compressed before it ignites. While Octane is the ability to resist Knock. But given the choices their answer was the best.

It's still technically correct.  Knock is ignition from compression.  Lower octane fuels are more likely to detonate from compression than higher octane fuels, and high compression is a component of high performance engines.  So the higher compression ratio engines need a higher octane to keep from knocking.

[blunc]

missed the horsepower question, didn't feel like looking it up.

[chunkypeanutbutter]

38/40. Oops. Seems to be common, though! 

[Crazy Ed]

It's still technically correct.  Knock is ignition from compression.  Lower octane fuels are more likely to detonate from compression than higher octane fuels, and high compression is a component of high performance engines.  So the higher compression ratio engines need a higher octane to keep from knocking.

    Hi There Brian. Seems to me you're the conditions that cause Knock/Pre Ignition, not the Fuels abulity to resist it. Guess we'll agree to disagree on this'n.

[DaveM]

40 here too.  I was tempted to say that a dual exhaust helped the engine's performance by increasing the exhaust noise, but I know better.    

 

[DaveM]

Octane rating or octane number is a standard measure of the performance of an engine or aviation fuel. The higher the octane number, the more compression the fuel can withstand before detonating (igniting). In broad terms, fuels with a higher octane rating are used in high performance gasoline engines that require higher compression ratios.  

 straight from Wikipedia, but there are many other sources.  

 

I think we're all on the same basic page here.  Higher octane resists knocking because it doesn't detonate at such a low compression.  Compression related detonation is the source of knocking, so the octane rating is a measure of the gasoline's ability to be compressed without detonating.  They  used to  use card gap testing  to test fuel mixtures at certain ratios, temperatures and pressures.  This was more common as a way to test Nitromethane fuels.  (Really, the card gap test is more of a stability test for explosives, but it is still measuring resistance to shock, or rapid compression)  

[Force]

40 out of 40 here...basic engine knowledge.

[s10chevypu]

I got 37 out of 40 right, not bad

[timc]

38 of 40 here but i read questions wrong.

[Lizard Racing]

The only one I missed was the octane question.  Trick question!