[Mgs] HIF's

[PaulHunt73]

The clunk test is done with the engine off.  It won't clunk at idle as the 
idle airflow lifts it off the bottom, and lifting it any more than 1/32" 
will probably stall it.

Strictly speaking the clunk test should be performed with the jet raised 
level with the bridge, i.e. about two full turns from the normal position. 
If it clunks here i.e. the needle doesn't bind then it definitely won't bind 
with the jet in the lower running position.  But with sprung needles instead 
of fixed it's very unlikely to bind anyway, and with HIFs there is no 
provision for centring the jet even if it doesn't clunk.  But it's still 
worth doing to make sure it isn't binding, perhaps due to a bent needle.

The dampers won't make any difference to the clunk test.  They only damp the 
upward movement of the piston, when you have forced them up against the 
damper and then let them go they should drop smartly with said clunk.

PaulH.

----- Original Message ----- 
> Several of you mentioned that after lifting the pistons you should hear a
> "clunk" when they drop. Is this when the car is off, idling, or both?