6 replies to this topic

[johnnysti]

Hi all

The head is coming off bertie on sunday (if im awake!!) and is off to slark for a revamp. Ive been told to get a set of 1:3 roller tip rockers while its off.
The only thing is when i tell the wife that i need them (somehow) she will ask why and im worried that i cant give her a real reason. Please colud someone tell me the purpose of upgrading them as the thing she will moan about is the cost of £330 for a complete set. What gains will i get and is it a stronger part to have anyway?
Sorry if it seems a stupid question.................i am stupid!!!

Johnny

[Guess-Works.com]

Get a matched set, rockers and valve springs, the advantage is greater valve lift without having to change the cam...

Other than that, I think this is a can of worms which does not need opening again !

[pikey7]

The roller tips reduce the side load on the valve, extending valve and valve guide life. Plus they look blinging if you like to take off your rocker cover!

As GW says, I'm going nowhere near the "ratio" thing either!

[Jammy]

LOL!! Tis just like QI when Alan Davies always states the obvious answer and the alarm goes off!

As said, rollers reduce side loads, etc thus reducing friction, which is always a good thing to go towards losing less power.

Also, by increasing the ratio slightly you are opening the opening the vlaves slighly more with each engine cycle (I can't remember whether they open for longer or not as well). With the valves opening more it means more fuel vapour can be allowed into the combustion chamber and more exhaust gas can be expelled. Effectively meaning a bigger bang and slightly more power.

However, the rockers should be matched carefully with the valve springs and more importantly the camshaft. If you have a standard camshaft then Slark Engineering should be able to tell you what are the best rockers to go for (so if they've recommended the 1.3s then go for them), else, if its a aftermarket cam, ring the manufacturers of the cam and get their advice.

[johnnysti]

LOL!! Tis just like QI when Alan Davies always states the obvious answer and the alarm goes off!

As said, rollers reduce side loads, etc thus reducing friction, which is always a good thing to go towards losing less power.

Also, by increasing the ratio slightly you are opening the opening the vlaves slighly more with each engine cycle (I can't remember whether they open for longer or not as well). With the valves opening more it means more fuel vapour can be allowed into the combustion chamber and more exhaust gas can be expelled. Effectively meaning a bigger bang and slightly more power.

However, the rockers should be matched carefully with the valve springs and more importantly the camshaft. If you have a standard camshaft then Slark Engineering should be able to tell you what are the best rockers to go for (so if they've recommended the 1.3s then go for them), else, if its a aftermarket cam, ring the manufacturers of the cam and get their advice.

Hi all
Its a 286 if i remember rightly. So if i get the complete kit for £330 does that include all those other bits you guys were on about? Im not sure what the difference is between the sets that are about £175 and the 'complete' sets that are £330?

[Sprocket]

And £330 seems a little excessive, sounds like the price tag for full roller rockers and not realy nescisary on a fairly mild tune engine, if at all. I think you'll find the roller tip rockers are far cheaper and that shouldn't hit the pocket as hard, and hopefully the wife wont then hit you as hard.

[The Matt]

Other than that, I think this is a can of worms which does not need opening again !

As GW says, I'm going nowhere near the "ratio" thing either!

LOL!! Tis just like QI when Alan Davies always states the obvious answer and the alarm goes off!

Lads, thank you sooooooo much for handling that so well!

As said above, there is plenty of info out there already which stated the benefits of them, but as with all other tuning components, you have to make sure they are matched and properly suited to the rest of your setup.

And MS is right, you can get roller tip rockers alot cheaper than full roller setups!