rockers or cam?
on a VSII with enclosed pod cai (a la mace), extrractors, 2.5'' catback
what would be the next upgrade, bang for the buck wise....
was looking at 1.98 rockers or a crow cam... the cam seems a little pricier and I was wondering which would be the better option with my current setup
also, on my current setup what rwkw should be i expecting? 115-125?
High ratio rocker excpect a increase of around 12rwk,, googel the rockers theres some dyno curves out there, but realy just a cheaper substitution for a cam
what should i expect from a cam? i know it's a bit pricier
heres a link for some stuff that works with standart internals, u will need a good combination of intake flow and exhaust flow ( just a twin cat one of each bank straight through system gives a vn v6 about 14 kw at the wheels but costs more than high ratio rockers)... im assuming ur is a v6
Crow Cams
i wouldent wast time on anything other than stage 3 for a start 180 kw at fly wheel
yea, it's an ecotec 6 with an enclosed pod, extractors and a redback 2.5 inch catback... still has the original cat and y-pipe
With a proper size cam expect at least double the gains you would get from rockers, at least, maybe 3 times
Well rockers don't affect valve duration, only lift. Unlike a cam which affects both. So of course a cam is going to be better. If you can install the cam yourself it'll work out cheaper than rockers too.
actually yeah i was curious on this aswell, trying to weigh up the gains from both rockers and a cam.
Going a cam will make more power then say a set rockers, however there is also much more work involved (read $$$ if you can't do the work yourself). A tune is also needs to be factored in as well to suit the cam.
I personally won't do a cam install on a V6 as you do run the risk of spinning a cam bearing shortly after installing a new cam. Not common but it does happen, so it's something I could live without LOL
On this note we do sell and stock cams and rockers so we certainly do have an understanding as to which application they are most suitable for
What if you were to get better cam bearings as well?Originally Posted by MACE
Going a cam will make more power then say a set rockers, however there is also much more work involved (read $$$ if you can't do the work yourself). A tune is also needs to be factored in as well to suit the cam.
I personally won't do a cam install on a V6 as you do run the risk of spinning a cam bearing shortly after installing a new cam. Not common but it does happen, so it's something I could live without LOL
On this note we do sell and stock cams and rockers so we certainly do have an understanding as to which application they are most suitable for
Going a cam will make more power then say a set rockers, however there is also much more work involved (read $$$ if you can't do the work yourself). A tune is also needs to be factored in as well to suit the cam.
I personally won't do a cam install on a V6 as you do run the risk of spinning a cam bearing shortly after installing a new cam. Not common but it does happen, so it's something I could live without LOL
On this note we do sell and stock cams and rockers so we certainly do have an understanding as to which application they are most suitable for
what would the gains from 1.98 be on an engine with an encloesd pod CAI (fit), extractors and redback 2.5'' catback? and how much would it cost installed... alot of posts on this site seem to be from vic, i'm in the hawkesbury nsw
What I said is mostly applicable when installing a cam on a second hand engine. Installing a new cam with new bearings is ideal in many applications however in some of the high end stuff it's recommended that the cam bearings are doweled
In regards to power gains they can range from 13-20kw at the wheels with the 1..98:1 ratio rockers with your current mods. Installation can cost around $180 give or take, but is quite easy to install if patient
Just wondering... with the high ratio rockers produce a tappet noise once installed??
Not at all, unless you've installed stiffer springs or are running a different cam.
Otherwise if they are noisy then the main reasons would be that there isn't there isn't enough lifter preload/crush or that the pushrods are touching the cylinder heads.
Last edited by MACE; 14-01-2010 at 01:33 PM.
Donating Member
So when you install the higher ratio rockers you need to purchase stiffer spirngs? (correct me if im wrong but do you mean valve springs?)
And also ive heard this is an easy mod to install yourself with a small amount of car knowledge, is this correct?
97 WRX AWD
Tein Coilovers + EDFC Dampener Control - Whiteline heavy duty Rear sway bar - Whiteline Droplinks front and rear
Turbosmart dual stage boost controller
IHI VF34 Turbo - XForce 3inch TBE - Oversized TMIC - Unichip PiggyBack ECU
PPG Straight cut 1st & 2nd, Slight helical 3rd & 4th and standard fifth - HD Clutch - custom braided clutch line
02 wrx 4pot front calipers - DBA500 two peice slotted rotors - Steel braided Lines
BP98 safe tune @ 171.8awkw
Doh! I read my post again and it was inaccurately writtenLOL
All fixed now
In regards to your questions stiffer springs are not required. As for installation, they are quite easy to do as shown in the link below. Just add street commodores together where the *** are in link below for it to work
http://www.****************.com.au/i...146%20POWR.pdf
Cheers
Steve
Last edited by MACE; 14-01-2010 at 02:11 PM.
mace when you gonna do a nice special on these rockers so we can all buy a set!
Our pricing with this family of products represents the best bank for buck on the market for the ecotecs. However if you want an even better price best to PM me as I may having something kicking about
just thought i would chuck my 2 bob in, ok atm i have a vr v6, extractors, 2 1/2 exhaust, pod, cai, shift kit n tune.
now im doing this other engine up out of my other vr, very clean engine, only 120 km on clock, was originally going to put cam and rockers in it, which is bout $1200, to do this my self as well im talking, and gaskets for rebuild was going to be about $200, so $1400 was going to have a good motor right, well aparently not.
i rang a couple of places to see what they thought about various pistons for this motor, and i told them what i have done and what im doing and they said that my bores might be glazed, i would also need to change my cam bearings if going to a new cam otherwise 4/10 cases after 1000km it will just spin cam bearings,
so i had a talk to one bloke right, he said he can do me a deal,yella terra roller rockers 1.7 or 1.8 ratio, crow cam stage 3, bored out 20 though (this is instead of checking for glazing of bore and more power) bigger pistons, graphite gasket set, new cam bearings installed (need a special tool for this?) and also sending my block away from Wagga Wagga NSW to Victoria and back, all this for $2500, so im more inclined to go this way
this was at port city engines as well if you are wondering who, they build these engines for speedway cars, they said with these upgrades should be pushing 200rwk easy
but for you my friend, rockers are so much easier than a cam mate, but yea
and sorry for my bad spelling
Vs eco 3.8, extractors, 2.75" exhaust, roller rockers, cammed, bored out 20, t5 manual, rolling on king springs all way round with monroe gt shocks all way round, every door has a ding but looks can be very deceaving
iv had a set of mace 1.98:1 s and they were easy to install and after i put them in my car started to cherp into second (standard auto) i didnt get a tune to suit and economy didnt chang noticably.
what did you have done to your car? as mine churps second with 17 inch rims, 235 wide, also with no brake stop still foot flat, will automatically bag 1st, then click 2nd straight away and peal out 2nd, and i dont have that many mods?
Vs eco 3.8, extractors, 2.75" exhaust, roller rockers, cammed, bored out 20, t5 manual, rolling on king springs all way round with monroe gt shocks all way round, every door has a ding but looks can be very deceaving
ecotecs have less torque down low.
Peal out 2nd and run a mid 15 second 1/4common those are some pretty slippery 235s
maybe the roads are gravel where he comes from?
Posting Permissions
LinkBack URL
About LinkBacks
Reply With Quote
