Hey guys,
I'm currently attempting to build an NA M54B30 on a budget and I need your help. Building engines is not a skill I have mastered yet and I'm going far and wide outside my comfort zone, learning as I go.
So far I've got the block bored to 84.5, balanced new pistons, gaped the piston rings, plastigauged the main and rod bearings and did extensive head work.
I'm trying to figure out how valve springs rates relate to valve float at high rpm in these engines and what is high rpm for an M54 engine. I've seen claims that stock m54 valve springs are good for around 7000+ rpm. Also, I've read that the M50 non-vanos engines supposedly had stiffer valve springs and they could be used in the M54 head:argue:. Recently I found a local place that offered me a regrind of my original B30 cams, which got me thinking about supporting valve train upgrades (budget ones:thumbsup. Do you think M50 NV valve springs will work in the M54 head?
My next question is regarding cam regrind and piston clearance in vanos. I'm going for 11,5:1 CR, so I will need to deck the block with 0.08. My new pistons are 0.02 lower than the stock B30 pistons and also have bigger valve reliefs (around 0.12 deeper, much like the B25 pistons). How much cam do you guys think I can run without loosing vanos?
Thanks i advance.
P.S. I appologize if the questions I have are already answered in another thread and I've missed it. I tried searching and reading before posting this.
I'm currently attempting to build an NA M54B30 on a budget and I need your help. Building engines is not a skill I have mastered yet and I'm going far and wide outside my comfort zone, learning as I go.
So far I've got the block bored to 84.5, balanced new pistons, gaped the piston rings, plastigauged the main and rod bearings and did extensive head work.
I'm trying to figure out how valve springs rates relate to valve float at high rpm in these engines and what is high rpm for an M54 engine. I've seen claims that stock m54 valve springs are good for around 7000+ rpm. Also, I've read that the M50 non-vanos engines supposedly had stiffer valve springs and they could be used in the M54 head:argue:. Recently I found a local place that offered me a regrind of my original B30 cams, which got me thinking about supporting valve train upgrades (budget ones:thumbsup. Do you think M50 NV valve springs will work in the M54 head?
My next question is regarding cam regrind and piston clearance in vanos. I'm going for 11,5:1 CR, so I will need to deck the block with 0.08. My new pistons are 0.02 lower than the stock B30 pistons and also have bigger valve reliefs (around 0.12 deeper, much like the B25 pistons). How much cam do you guys think I can run without loosing vanos?
Thanks i advance.
P.S. I appologize if the questions I have are already answered in another thread and I've missed it. I tried searching and reading before posting this.