Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
i have a hz sedan with a gts dash recently ive cahnged the oil, now ive noticed that the oil pressure reading on the gts guage are different, its lower. why is this so?? ive used the same oil that ive used before??
|
|
|
|
|
|
Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
I too have a HZ with a std red 253, I have a Speco oil preasure gauge fitted and I get 50psi @ 2300rpm, after a while gets down to 40psi.At idle it drops to 10-15psi on a hot day. Make sure the idle is set right as if its too low then the preasure will dr
|
|
|
|
|
|
Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
did you change the filter too?
dont the pumps pump into the filter?
if so, and your filter was a bit blocked, then the pressure drop would be a good thing (more flow)
remember, flow is better than pressure.
DO NOT WRITE BELOW THIS LINE
|
|
|
|
|
|
Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
High volume oil pumps are the best way to keep the pressure up. They look the same as originals but they are cast steel and protect your cam and lifters better. JP Engineering make them in Adelaide I think. Wayne
|
|
|
|
|
|
Rank: Veteran
Groups: Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 1,991
Was thanked: 2 time(s) in 2 post(s)
|
It is perfectly normal for the pressure to be around 4-7 psi at idle and run at around 28-32 psi .
High pressure pumps are not necessary and in fact undesirable in a street engine as they can wash the bearing material out. I would think 50 psi is either
|
|
|
|
|
|
Rank: Veteran
Groups: Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 1,991
Was thanked: 2 time(s) in 2 post(s)
|
Also if you changed the gauge did you fit the right sender?
|
|
|
|
|
|
Rank: Guest
Groups: Guests
Joined: 2/09/2015(UTC)
Posts: 43,977
Was thanked: 5 time(s) in 5 post(s)
|
How does it wash the bearing material out, the pressures are normal just a bit more constant throughout the rev ranges. High volume not high pressure. Anything over the relief valve will be by-passed anyway. Oh well its served me well for the past 10 year
|
|
|
|
|
|
Rank: Veteran
Groups: Registered, Veteran
Joined: 1/03/2005(UTC)
Posts: 1,991
Was thanked: 2 time(s) in 2 post(s)
|
Read Cranes site. The pressure washes the surface tinning off the bearing and it breaks up. I am only going on the pressure recommendations in the Holden shop manuals.
|
|
|
|
|
|
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
