You know your way around marine en­gines? This cap­tain’s test will gauge your ba­sic marine en­gine knowl­edge. Let’s see how much you know. — John Tiger

Boating - - MAKING WAVES -

1. What is the main dif­fer­ence be­tween a four-stroke en­gine and a two-stroke en­gine?

A. A four-stroke is faster than a twostroke.

B. A four-stroke uses me­chan­i­cal valves and a camshaft to con­trol the in­take charge, where a two-stroke uses reed valves and pis­ton ports for the same func­tion.

C. A two-stroke makes power ev­ery revo­lu­tion of the crank­shaft, where a four-stroke makes power with ev­ery two rev­o­lu­tions of the crank­shaft.

D. A four-stroke is more ex­pen­sive than a two-stroke.

E. None of the above

F. B and C

2. What does DFI mean rel­a­tive to an en­gine?

A. Don’t For­get It

B. A new type of ig­ni­tion sys­tem on “clean” out­board en­gines and stern­drives

C. Dif­fer­ent Fuel & Ig­ni­tion

D. Di­rect Fuel In­jec­tion

E. None of the above

3. What does the term I-6 typ­i­cally mean when re­fer­ring to a marine en­gine?

A. Noth­ing, the term has no sig­nif­i­cance. B. Ig­ni­tion Six C. In­line Six D. None of the above

4. What is a cat­alytic con­verter, what does it do, and why is it in­stalled on mod­ern in­board and stern­drive gaso­line en­gines?

A. It helps keep the en­gine ex­haust clean (re­duces emis­sions).

B. It’s re­quired by law, sim­i­lar to au­to­mo­biles.

C. A de­vice in­te­grated into the ex­haust sys­tem, with a sub­strate in­side that con­verts toxic gases and pol­lu­tants into less en­vi­ron­men­tally dam­ag­ing emis­sions.

D. All of the above

E. A and B

5. Why are more boat man­u­fac­tur­ers in­tro­duc­ing hulls de­signed, built and equipped with mul­ti­ple out­boards in­stead of us­ing stern­drives?

A. Out­boards have re­cently grown to be­come larger and more pow­er­ful, and at the same time they are still lighter than in­boards and stern­drives.

B. Out­boards are more eas­ily re­place­able if nec­es­sary; sim­ply un­bolt the old one and re­place with the new one.

C. Stern­drives and in­boards are ob­so­lete.

D. None of the above

E. A and B

6. When talk­ing to your me­chanic, what is the dif­fer­ence be­tween these state­ments: 1) “My en­gine won’t start.” 2) “My en­gine won’t turn over.” 3) “My en­gine won’t fire.”

A. There is no dif­fer­ence; they all mean the same thing.

B. “Won’t start” could mean ei­ther 2 or 3.

C. No. 2 means the en­gine starter won’t en­gage and crank the en­gine.

D. No. 3 means the starter cranks the en­gine, but it won’t start and run.

E. None of the above

F. B, C and D

1. F. The lat­est four-strokes are no more ex­pen­sive than two strokes, and top speeds are very com­pa­ra­ble.

2. D. Di­rect Fuel In­jec­tion, used (for ex­am­ple) on Ev­in­rude E-Tec out­boards.

3. C. In­line Six, re­fer­ring to the cylin­der con­fig­u­ra­tion of the en­gine block.

4. D.

5. E.

6. F.


Test your knowl­edge of boat­ing with more Cap­tain’s Tests at boat­ing­­tain­stest.

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