Carl Heideman
Carl Heideman
8/18/20 6:35 a.m.

It’s a common question in our world: Does this automotive widget work as promised? Roller rockers are among the more popular and often misunderstood widgets, and they promise seemingly magical gains with few downsides. 

Do roller rockers really improve performance, save gas and make you…

Read the rest of the story

wspohn
wspohn Dork
8/18/20 12:18 p.m.

The use of roller tip rockers with higher than stock ratio will increase lift but also eventually wear out the valve guides (although not as quickly as high lift non-roller rockers would).  I don't mean tomorrow, but 30-40K down the road, you may end up with guide issues.  It sure works while it works though.

Just don't be 'that guy' that buys valve train components from three different manufacturers because they save $5 doing it, only to find that they ended up with valve spring 'crunch' when the spring is compressed fully with coil touching coil and the rest of the valve train si still trying to compress it more - I've seen that and it isn't pretty.

jefeingold
jefeingold New Reader
8/29/21 4:54 p.m.

As noted, increasing rocker arm ratio increases valve lift. Increasing valve lift also reduces valve-to-piston clearance. No, you don't want your valves to touch your pistons - bent valves or punctured pistons can result. This could be a concern if you already have a high lift cam, high compression pistons, a milled head, or a decked block. 

dougie
dougie HalfDork
8/29/21 11:54 p.m.

In reply to jefeingold :

Correct , you need to do the math and double check everything for clearances. When done right, the gains can be huge....

wspohn
wspohn SuperDork
8/30/21 11:39 a.m.

Let me guess, Dougie - do you cover all that with a nice alloy cover?  They certainly are pretty.

Of course the best rockers are none at all.....

 

dougie
dougie HalfDork
8/31/21 12:08 a.m.
wspohn said:

Let me guess, Dougie - do you cover all that with a nice alloy cover?  They certainly are pretty.

Of course the best rockers are none at all.....

 

That would be true if your car sat in the garage or only saw the grass of a static car show.....I exercise mine on the track regularly as the upgraded engine was designed for.....

 

 

 

CFreeborn
CFreeborn New Reader
4/23/22 12:51 p.m.

Nice driving Dougie.

Maybe I'll see you out at PIR one of these days. If I can get my car together...

tolyarutunoff
tolyarutunoff New Reader
4/23/22 3:59 p.m.

you can waste horsepower with too stiff valve springs

Our Preferred Partners
RqyCkJnvbzsM2qQ9Ubos3UjM1c1Zjq0KGoWCeIm58mPoNQFbNA6XNCkBsOLbXYz3