Who's 1.9.1 roller rockers are better?

[Skrewdriver]

Does anyone have any pros or cons about the 1.9.1 high ratio roller rockers From Yella Terra, FIT or Mace. Which is best,who's are ordinary ,value for dollars,etc . i'm after comparisons and other members' opinions.

[vsl67]

Yt are brand new true rolla tip rockers Mace & fit are non rolla tip remanafactered factory items , its up to you what you use performance wise you probaly wont notice a difference between them but if your going to spend the money might aswell go the Yt RR which you can get from the US delivered for a similar price for the Mace/fit RR not so long ago


These are Yt Rolla rockers

[Blakvsexec]

Its chalk and cheese.
Like a comparrison between rooting a bloke or a sheila, the one with the bloke will do but just wont be very nice, where as with the sheila is much better and you can tell all your mates. lol

get the yella terra ones.

[Skrewdriver]

thanks vsl67, can you recomend a place in the US to get them? cheers

[MR_VX]

Yea i fell screwed with mine FIT ones, if i done it again id got for the YT ones

[Skrewdriver]

Do yella terra 1.9.1 have any identifing marks on em? ,so you could tell if they were correct from wreckers/ swap meets ,etc?

[Decicrate]

From memory all the Yella Terra ones have it stamped on them.

[soop]

YT by a coutry mile.
Also you can't mistake them;



VS

[vsl67]

thanks vsl67, can you recomend a place in the US to get them? cheers

INTENSE-Racing.com - Pontiac G8, Grand Prix, Bonneville, Regal, L67 3800 Supercharged Performance Products, Mods and Tunes.

Or ZZ Performance
I cant seem to get their web site up at the momemt

[HamaTime™]

Do yella terra 1.9.1 have any identifing marks on em? ,so you could tell if they were correct from wreckers/ swap meets ,etc?

Not sure, but you can tell the difference easily. See below.

YT by a coutry mile.
Also you can't mistake them;



VS

To The OP:

Yella Terra are completely different designs, they are a Roller Rocker manufactured from lighter and stronger aircraft grade alloy, with a roller bearing TIP on them. (See the photo for the difference). At higher RPM's these Roller Tipped Rockers aka 'Roller Rockers' apparently create less side load on the valves. ~ RUF 231

MACE, FIT etc, all use the stock 'Rocker' from the factory which are re manufactured with the heads/tips skimmed etc (and all the rest) to create the higher lift.

For a technical report on the differences between standard 'Rockers' and 'Roller Rockers' - see this article here Roller Rockers vs Rockers

Talking to alot of modifiers and engine builders, most recommend YT products due to their obvious advantages listed above (being a stronger, lighter grade alloy, different design, true 'Roller' design which creates valve stability etc). If you are asking an opinion on which is better, I'm not going to say yay or nay to either, though if I was to buy higher ratio rockers it would be true Roller Rockers. But I wouldn't be going down that road, I'd prefer a lumpier cam. The difference would be minimal on a stock V6.

Based on the above, the choice is yours.

All this being said though, I would go with a different cam before upgrading rockers. But that's my preference.

[soop]

I concur.
Use standard ratio roller rockers with an upgrade cam for the best results.

[wraith]

I concur.
Use standard ratio roller rockers with an upgrade cam for the best results.

Cost vs gain though?

[soop]

Do it yourself and it doesn't cost any more.

Use the right cam for the setup you want and you'll benifit from it much more then dodgy high ratio rockers.

[delcowizzid]

regrind on a stock cam $280 gain around 20% more hp throw in some new inlet gaskets and timing cover gasket and maybe a timing chain if the cam is large but not totally nessicary we run 222@0.050 0.495 lift on stock chain and springs revs to 6500 no problems

[HamaTime™]

Cost vs gain though?

Yes that is a definite factor, however, Cam's open up a better power range, not to mention considering longer term benefits, a higher performance camshaft, along with an upgraded and strengthened valve train, along with some suitable ratio rockers to the cam specs is probably a better choice?

Cam with upgraded valve springs and double row timing chain + Increased compression = Torque/Kw/Power

Rockers = a bit more power thanks to increased valve lift, but won't open up as much gain as a cam.

In my experience with cars, you either do things properly or be happy with something that isn't really....

[soop]

As the sayings go.
Do it right, do it once and/or the poor man pays twice.

[delcowizzid]

no point lifting the valve higher if the heads dont flow anymore at the higher lift LOL

[soop]

Couldnt that actually cause issues with how the fuel fills the cylinder?

[HamaTime™]

no point lifting the valve higher if the heads dont flow anymore at the higher lift LOL

This is also very true.

Point of the thing is, take the motor out, build it properly! haha.

[soop]

dont even have to pull it out to put a new cam in.

[delcowizzid]

yeah key is never buy an off the shelf cam grind get it ground to suit what mods you have all the way down to the diff gears and you wont go wrong

[HamaTime™]

dont even have to pull it out to put a new cam in.

Yeah exactly.

yeah key is never buy an off the shelf cam grind get it ground to suit what mods you have all the way down to the diff gears and you wont go wrong

Yeah that works too, I have heard good things about off the shelf cams. But if your building a full motor, might as well go custom to suit the whole build.

[a1k3m1]

ive got MACE ones in mine, there better than stock ones lol... cant really compare as i havent tried the YT ones yet, but the upgrade from stockies to MACE's was huge lol

[soop]

All you're doing is holding the valve open longer.
Putting more force on the push rod, lifter and cam lobe.

Its the most arse backwards way of doing it.

[Z2TT]

Well I guess the head flow is fine since gains are still being had from 1.91 to 1.95 and from 1.95 to 1.98?

FIT Seem to say that their rockers give the most power gain e.g their extreme ones but I think this was topped by YT not long ago,
I just don't know how far they can go without compromising the reliability of the engine.

I guess a good way to go would be a ported head+rocker package to get most gains MACE do a package but kinda costly. But hey for those prices you might aswell just put a SC V6 in
and theres your power + more potential

In terms of power output would they pretty much be the same if they are both 1.91? Whether from YT to MACE to FIT? or is there other factors
that could affect power output.