Ecotec Stroker Kit Questions

[[V6] Vr CoMmY]

G'day commodorians and MACE,

I've got a vu series 2 s pack ute, so far my mods include,

K&N Panel Filter
Mace 70mm throttle body
Mace 25mm insulator
Mace 12mm plenium spacer
mace 1:98 roller rockers
Pacemaker extractors into twin 100cpi cats
twin 2.5in cat back exhaust

Now these are my questions haha

I am interested in the MACE Stroker kit 2 but I was wondering if I could put it in myself or do I need to get an engine specialist to do it? Like does my block need modification to have the clearance for the kit?

And what cam do you recommend to get the max lift in my engine

CHEERS for any help

[vyseriesII]

If you got 1.98 rockers you wont need a cam with anymore lift. People usually go one way or another. Big cam, standard rockers or high ratio rockers. Though there are cams to suit high ratio rockers but i assume they have bugger all valve lift on the cam.

[TI3VOM]

If you got 1.98 rockers you wont need a cam with anymore lift. People usually go one way or another. Big cam, standard rockers or high ratio rockers. Though there are cams to suit high ratio rockers but i assume they have bugger all valve lift on the cam.

A cam upgrade is not all about lift, it is also about duration. The longer the duration the longer the power is made before it drops off.
I personally don't know why people would spend so much on upgrading to a cam, just to keep the stock rockers there as well. The Yella Terra Roller Rockers are a lightweight billet item that has the true roller tip, what that means is less weight and less wear = more power

[vyseriesII]

A cam upgrade is not all about lift, it is also about duration. The longer the duration the longer the power is made before it drops off.

I am aware of all this. While a cam would make things better they also come with a lot of Time and money to install and tune to suit. The gains he would get would be very little for the outlay of money. Cams do sound good at idle. But each to there own.

[TI3VOM]

Are we talking gains on a dyno or a quarter mile drag strip?

I know that a cam is a lot to install as well, with the rockers he has in his car, he will not gain much KW from a cam upgrade as he is already seeing a lot of lift from the rockers, but he defiantly would gain more acceleration from a cam for everyday driving/racing.

[vyseriesII]

I know what your saying but he was asking about max lift for his vehicle. I was just saying the cam he would get to suit his rockers if he wanted to go to the expense wouldn't give him more lift. There is no doubt his car would be better with a cam due to its more agressive gind and duration.

[TI3VOM]

My bad mate.

[VKCOMMO]

Chances are you will need to get the whole rotating assembly balanced, And while you're at it you might as well get the block reconditioned (dipped, bored and honed)..

Do it right, do it once..

[db_notso]

agreed nothing worse than rebuilding a motor and having to do it again cause you did a quick rings and bearings job...(40-60 000 km's)

this is why mechanics is a trade... use em'

[HoldenManDan]

Even the sump will need clearancing. Definately an engine rebuilder's job unless youre experienced and have the right tools for the job.

Also, dont bother building a high comp na stroker, the money spent for the outcome will not be worth it. Lower comp for boost is the way to go.

Dan

[[V6] Vr CoMmY]

Thanks for the input guys, I'm thinking of scraping the high ratio rockers and putting lightweight yt 1:6 ratio ones in so I can put a bigger cam... Any recommendations on cams or what brands I should steer clear of?

And does anyone know and decent engine builders (that won't rip me off and have pride in their work) in the north coast preferably between coffs harbor and goldy

Cheers

[MACE]

In regards to installing the stroker, if you've had engine building experience then it's something you can tackle yourself. Otherwise you'd need to contact a reputable engine builder.

In regards to roller tipped rockers are not really needed in all but an extreme competition cam. Money can be better spend elsewhere (unless the rocker ratio is changed at the same time). You'll find that the mass moment of inertia of the factory based rocker is less then that any market roller tipped item so they are less likely to experience valve float. You only have to look at the LS1 guys to see how infrequently they change their rockers when they do an aggressive cam upgrade as they're not needed.

Given the tip geometry of the ecotec rockers, friction isn't issue, unless you're approaching the .600" lift mark. Even then it's not the end of the world if you're on a budget and would like to spend $700 odd dollars elsewhere.

Everybody has their own opinions (which is to be respected), in summary though if you're going a cam and are on a limited budget keeping the factory rockers works perfectly well reliably.

Cheers,
Steve

[[V6] Vr CoMmY]

Thanks Steve,

I will most probably be in contact with you within the next couple of months to get my built going....

Cheers to everyone who put their bit in

[MACE]

No probs

If you have any more questions please don't hesitate to ask.

Cheers,
Steve