Engine guys Valve springs question?
Thread Starter
Racer
Joined: Jan 2010
Posts: 367
Likes: 1
From: Christchurch Canterbury
Engine guys Valve springs question?
Have have just recieved a pair of Brodix race rite BBc heads.
I asked Brodix to assemble them to suit solid flat tapped cam( Isky Z33)
The specs of the installed springs are
150lbs on the seat
365lbs open
Isky recommends 135 lbs on the seat, 395lbs open.
Is 150lbs on the seat too much ? will it affect cam life ?
Cheers
I asked Brodix to assemble them to suit solid flat tapped cam( Isky Z33)
The specs of the installed springs are
150lbs on the seat
365lbs open
Isky recommends 135 lbs on the seat, 395lbs open.
Is 150lbs on the seat too much ? will it affect cam life ?
Cheers
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
If you haven't broken in your cam yet, make sure to remove the inner springs until you do.
Once that's done you should be fine running what Brodix sent to you.
As Gkull mentioned, they will lose a bit of spring pressure after they have been run for a while.
Once that's done you should be fine running what Brodix sent to you.
As Gkull mentioned, they will lose a bit of spring pressure after they have been run for a while.
Advanced
Joined: May 2006
Posts: 55
Likes: 0
From: Austin, TX
Good advice from Driveshaft. Light springs to break in flat tappet cams. I am more concerned with the max pres of your springs. If they settle in to 350lb or so at full lift, you might not have enough valve control over 6000rpms to keep the lifters on your 7000 rpm cam. 350lbs vs 400lbs is quite a difference. It sounds like you may need dif springs. I'd call Isky and double check with them.
If you have titanium retainers and good rockers you might be OK. (The BBC has a heavy valvetrain.)
Are they making Titanium pushrods yet?
If you have titanium retainers and good rockers you might be OK. (The BBC has a heavy valvetrain.)
Are they making Titanium pushrods yet?
Thread Starter
Racer
Joined: Jan 2010
Posts: 367
Likes: 1
From: Christchurch Canterbury
Good advice from Driveshaft. Light springs to break in flat tappet cams. I am more concerned with the max pres of your springs. If they settle in to 350lb or so at full lift, you might not have enough valve control over 6000rpms to keep the lifters on your 7000 rpm cam. 350lbs vs 400lbs is quite a difference. It sounds like you may need dif springs. I'd call Isky and double check with them.
If you have titanium retainers and good rockers you might be OK. (The BBC has a heavy valvetrain.)
Are they making Titanium pushrods yet?
If you have titanium retainers and good rockers you might be OK. (The BBC has a heavy valvetrain.)
Are they making Titanium pushrods yet?
Yes good point, will do on isky see what they say
Cheers
