Leak Down Test

[black sky]

Like the tittle said how much is a leak down test and where abouts in lansvale can i get it done??

Cheers

anthony

Edited January 31, 2007 by black sky

[guesty]

just curous, Whats a leak down test?

[nfi]

Leak down test involves blowing a lot of air through the spark plug hole and measuring the pressure the cylinder can hold.

This is fiddly as you have to hook the compressor up to a cylinder and then turn the crank until both valves are closed to get a reading.

It is more accurate than a compression test gauge as oil can cover up worn rings where as this doesn't let anything hide.

If the rings are worn badly you will get air up through the dipstick and if the valve stems are worn then you will hear air out the intake or exhaust.

<20% leakdown is considered ok while you really want under 10%.

New engines generally have about 3%.

[black sky]

Leak down test involves blowing a lot of air through the spark plug hole and measuring the pressure the cylinder can hold.

This is fiddly as you have to hook the compressor up to a cylinder and then turn the crank until both valves are closed to get a reading.

It is more accurate than a compression test gauge as oil can cover up worn rings where as this doesn't let anything hide.

If the rings are worn badly you will get air up through the dipstick and if the valve stems are worn then you will hear air out the intake or exhaust.

<20% leakdown is considered ok while you really want under 10%.

New engines generally have about 3%.

and how much does this process cost???

[wrxhoon]

and how much does this process cost???

That will depend on the car, it will take the same time to do as a compression test and its best to do both at the same time .

[black sky]

That will depend on the car, it will take the same time to do as a compression test and its best to do both at the same time .

the car is a gtr

Cheers

anthony

[Abo Bob]

I would recommend Bel Garage to get it done. Maybe $100.

[(B1) MR_fanny]

i got one done for 70bucks i recall.

[xtra.5]

Can a compression test and/or leakdown test be done on an engine not currently in a car?

Cheers

[32vspecII]

last time i got a full mechancal inspection it was about 150$ with comp/leak tests might as well check everything while you are there

[wrxhoon]

Can a compression test and/or leakdown test be done on an engine not currently in a car?

Cheers

Yes but to do a comp test you must be able to crank the engine .

[The Mafia]

I got both done for about $100