How many seconds is a few?

[beby99]

I noticed my Suzuki service manual says that during a compression
test, to crank the engine for a few seconds. So how long
is a few? How long do you guys crank the engine to get a accurate
reading?

Just curious, thanks.

[earlfor]

Re: How many seconds is a few?

Three

Earl :-)

I noticed my Suzuki service manual says that during a compression
test, to crank the engine for a few seconds. So how long
is a few? How long do you guys crank the engine to get a accurate
reading?

Just curious, thanks.

[lhanscom]

It doesn't really matter, just do it the same for all cylinders. You'll see your gauge even out too.

That said, I am completely sure that a few is 3.6148 seconds, be sure not to miss that number by more then .001.
:P

[beby99]

Thanks guys,

If I crank for just a few seconds (3 to 5) I get about 15 psi less
then when I crank for 10 seconds. Still within limits but want to
know which is the more accurate.

[lhanscom]

Compression numbers are never really accurate, though the highest number you get is probably the most accurate. Temperture of the engine, and air as well as a dirty air filter, and speed of the starter will all change the results day to day, and certainly bike to bike. A compression test is ment to give you values that can be compared across cylenders, all should read close to the same.