Pro`s and con`s of hydraulic lifters over solid lifters

[oblark]

As the title says what are the pro`s and con`s of hydraulic lifters over solid lifters ???

Is it a good upgrade to fit solid lifters in a 850 instead of hydraulic lifters ???

[claymore]

Depends on what red line you want to run.

[Harvey]

All I can say when is the last time you gaped your valves. That's a Pro in my eyes,must be 20 years the last car I did.
I think they never give any trouble if the oil changes are done on time & good oil used.

[claymore]

All I can say when is the last time you gaped your valves. That's a Pro in my eyes,must be 20 years the last car I did.
I think they never give any trouble if the oil changes are done on time & good oil used.

I wouldn't be able to have a 8500rpm limit with hydraulic lifters.

[Harvey]

I wouldn't be able to have a 8500rpm limit with hydraulic lifters.

Just to ask what is the max rpm for hydraulic - solid - air I think F1 max rpm was around 20k .

[stribo]

I think over about 11K-12K you need pneumatic. The way they keep reducing the redline of the F1 engines, they'll soon be back to solid lifters.

[oblark]

I`m I right in thinking that,

Solid lifters - need gapping but high rpm

Hydraulic lifters - self gapping but limited rpm

[claymore]

I think over about 11K-12K you need pneumatic. The way they keep reducing the redline of the F1 engines, they'll soon be back to solid lifters.

I think it's more to do with valve springs rather than the lifters.

I`m I right in thinking that,

Solid lifters - need gapping but high rpm

Hydraulic lifters - self gapping but limited rpm

Yep, but to be honest you should only really need to gap them when you put the head together.

[stribo]

I think it's more to do with valve springs rather than the lifters.

You are of course right Colin, springs can't close the valves quickly enough at F1 engine speeds.

[Wobbly Dave]

My ME7 has solid lifters.