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TIMING Questions might be tricks

J

John/Ont

Member
#1 - Normally is a Straight line measured in degrees or distance

#2 - Normally in a recipricating piston engine does the piston travel in a straight line

#3 - Normally in a recipricating piston engine is a rotating crankshaft measured in degrees or .000 of the inch

#4 - firing order 18436572 if # 1 fires @10deg. BTDC each cylinder fires @ how many degrees TDC of its own cylinder

#5 - if a v8 engine has a 4 deg retarded cam gear where is tdc of the #1 piston

#6 - if valve overlap takes place @ 180 deg where is TDC on a v8

#7 - if an injector injects fuel @ 23 deg BTDC where is #1 Crank pin
 
1. A straight line is measured in distance...except when it represents 180 degrees, or a multiple thereof.

2. NORMALLY the piston travels in a straight line...EXCEPT when allowing for thrust forces acting perpendicular to the direction of piston travel.

3. NORMALLY crankshaft rotation is measured in degrees. Distance measurements of crankshaft rotation would vary wildly, depending on distance from the rotational axis from which the measurement is taken.

4. Since all terminals in a distributor cap are [theoretically] equidistant from one another, if cylinder #1 fires at 10 degrees BTDC, each other cylinder should also be firing at 10 degrees BTDC.

5. TDC of the piston is at the same crankshaft position it always was, regardless of cam timing.

That's a start...
 
As in Guido's previous, vague timing question - context and word defintion is lacking. Tricky questions are usually "tricky" because words have multiple meanings.

E.g. " #7 - if an injector injects fuel @ 23 deg BTDC where is #1 Crank pin "

BTDC of what? In the field of engineering - TDC can refer to the crankshaft throw, or the piston - and not always both at the same time. A piston can be loose or disconnected from the crank and be at 23 degrees before top dead center - and that crank pin might be just about anywhere.

Also - the word "injector" in that question does not state for which cylinder.

I hope these aren't questions written with the hopes of teaching somebody how to diagnose and/or fix an engine. Teach somebody core fundementals instead of mulitple-choice trick questions - and they might have a chance of using that knowledge - and adapting it upwards to many situations.
 
#1 - Normally is a Straight line measured in degrees or distance

Distance?

#2 - Normally in a recipricating piston engine does the piston travel in a straight line

Yes back and forth

#3 - Normally in a recipricating piston engine is a rotating crankshaft measured in degrees or .000 of the inch

degrees of rotation

#4 - firing order 18436572 if # 1 fires @10deg. BTDC each cylinder fires @ how many degrees TDC of its own cylinder

10deg. BTDC

#5 - if a v8 engine has a 4 deg retarded cam gear where is tdc of the #1 piston

TDC is TDC and the cam makes no difference to TDC

#6 - if valve overlap takes place @ 180 deg where is TDC on a v8

At top dead center

#7 - if an injector injects fuel @ 23 deg BTDC where is #1 Crank pin

@ 23 deg BTDC in relation to the cylinder addressed


These questions seem really "off base" what are you trying to do, or understand?
 
Tell OJs lawyers that supplied the questions the height of the deck above each cylinder bore is needed to answer correctly and accuratly.This assumes the perfect crank is located in the block exactly as engineers intended.5&6 dont make sense to me.Yes DNA can fly.Just kidding I dont really care.
 
What about engine that have pistons in which the wrist pin IS NOT in the ceter of the piston to reduce piston slap? Many LA Chrysler engines came with such piston from the factory.

Kent
 
For question #6 on overlap. That takes place when any one piston is at the top of it's stroke after exhaust and the intake valve just cracks open while the exhaust valve is just about seated. This is hardly noticeable but can be seen if everything is adjusted correctly. The engine will never stop in this position so it has to be seen while rotating the engine over slowly.

Also when any one cylinder is in overlap the valves can be adjusted on it's running mate, since it will be at the top of it's compression stroke.
 
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