rockers and push rods

[tionaboy]

Hey guys
I have a 2000 model v6 vt commodore and its the first time im doin up a car so all help is realy appreciated.... iv been doin a little reserch on the net and found some 1.97 hybrid rockers and im puttin 5/16 push robs in. But was just wonderin if i have to get anythin customized to make them fitt....

[dynoryder]

you should buy the rockers and rods for your model

which is ecotec

ive seen 1:1.9 ratio but all you need is 1:1.6 rockers with the right cam

i would get the rockers from the shop you get the cam from

[tionaboy]

Thanx mate ... this prob sounds like a stupid question but wat is cams and wat do they do lol sorry like i sed neva done up a car let a lone gone near an engine lol

[dynoryder]

the cam moves the rockers up and down it dose this with cam lobes there like eggs look it up

if you going for speed i would sugest buying a car already done

[vxcalais_01]

Go the the Mace Engineering section, in the sponsors area, v6 modifications. They have 1.98 rockers with pushrods included, much cheaper. As a beginner, these rockers are better as you can do them yourself or cheap installation than a camshaft. Camshaft is cheap same as rockers, but expensive to install and then tune it. On Vt hopefully you can use a Chip instead of tune, check on the Crow Cams website. Mace have those packages as well,

[tionaboy]

Thanx heaps 4 the info... any more info on the questions that i asked ( do i need to customize anythin to put these push rods and rockers in )

[Tsunamix]

I have done MACE 1.98 rockers on my VT 2 v6. Easy as to do.
No customisation neded. No modification needed.

Only thing to remeber os make Absolutley sure you cover both ends of the pushrods, the rocker seat, the rocker pushrod face and the rocker valve face with the supplied pre-lube when you assemble.

Safety says by a torque wrench so you tighten the bolts to the correct torque.

[dynoryder]

so if you buy these rockers do they come with shorter rods if so what is the point it wont lift the valve any further

the best way to get more valve lift is a cam usally only repalce rockers if you want strength in the valve train

[acarmody]

The pushrods aren't shorter, they are stronger and thinner so they don't hit any overcast metal in your engine.

Yes the best way to get more lift is a cam, if you have the money. The cheapest way to get more lift is higher ratio rockers.

[Tsunamix]

I disagree. The best way to get more lift is the rockers. yes a cam can provide more lift, but to do it with a cam changes duration as well as lift. This changes the engines airflow characterists entirely.

it may change them for the better, but there are sacrifices there in terms of idle quality, economy and driveability as well.

Changing the rockers gives more lift, without changing any other engine characteristic. You don't need a tune to get the most out of them.

The pushrods are the same length, the contact point is moved in towards the post a bit, so that it multiplies the amount of lift (think push down on top on valve stem) a little.

Standard ratio at factory is about 1.6 I think. I'm running 1.98's and there are up to 2.15's around for the v6 ecotech.

[dynoryder]

I disagree. The best way to get more lift is the rockers. yes a cam can provide more lift, but to do it with a cam changes duration as well as lift. This changes the engines airflow characterists entirely.

it may change them for the better, but there are sacrifices there in terms of idle quality, economy and driveability as well.

Changing the rockers gives more lift, without changing any other engine characteristic. You don't need a tune to get the most out of them.

The pushrods are the same length, the contact point is moved in towards the post a bit, so that it multiplies the amount of lift (think push down on top on valve stem) a little.

Standard ratio at factory is about 1.6 I think. I'm running 1.98's and there are up to 2.15's around for the v6 ecotech.

would the 2.15's coilbind the springs if how close do they come if you know and do they make 2.15"s for buick sixs

[vxcalais_01]

would the 2.15's coilbind the springs if how close do they come if you know and do they make 2.15"s for buick sixs

Not for buicks yet, and no should not give coil bind. Stock modifided rockers are known for retaining factory characterisitcs over newly designed such as the YT's. I have been running YT's 1.95 for over 3 years now, no coil issues. Mace however are looking at packaging the 2.25 with modified heads, to cater for the extra lift and flow. Something i am looking forward to.

[acarmody]

I disagree. The best way to get more lift is the rockers. yes a cam can provide more lift, but to do it with a cam changes duration as well as lift. This changes the engines airflow characterists entirely.

it may change them for the better, but there are sacrifices there in terms of idle quality, economy and driveability as well.

Changing the rockers gives more lift, without changing any other engine characteristic. You don't need a tune to get the most out of them.

The pushrods are the same length, the contact point is moved in towards the post a bit, so that it multiplies the amount of lift (think push down on top on valve stem) a little.

Standard ratio at factory is about 1.6 I think. I'm running 1.98's and there are up to 2.15's around for the v6 ecotech.

Fair point. Though depending on the cam their may not be any noticable degrading of idle quality, economy or driveability.

The only bad thing about higher ratio rockers is that they increase pressure on the camshaft, only slightly, but it is there. Still people have been running them for years without destroyingcam bearings, or damaging cams.

To the OP, go for it and let us know how it went.

[dynoryder]

big lift cams can idle well cuz they dont have overlap

overlap is what stuffs up idle

forced air engines cant have overlap in the cam so they have max lift cams that nearly coilbind

[tionaboy]

Thanx heaps 4 all the info guys... bit short on money atm but will do it soon. Hopefully... and i will be bak on to tell u how it all went ... again thanxx