I just installed a set of the Gold Race 1.7 rollers on the Z06 this past Saturday...After my cam install, I had alot of tapping...I finally theorized that it was a lack of lifter preload...So, I went ahead and got a set of the fully adjustables...

The engine is as quite as a church mouse now...

As for running these with a bigger cam...My cam is somewhere around 234/238 .598/.602 114 lsa and no problems whatsoever...

Peace...Gman

 

thanx for the info. Anyone know if the variable ones are adjustable?

 

Yes, the Crane variable ratio (I think they call it Quick Lift) rockers are adjustable. You can by them as rockers only or as a complete kit with rockers, screw in studs, pushrod guideplates and HD pushrods. I think the 1.7 kit is part #144750-16 and the 1.8 kit is #144759-16. And they are definitely quiet. Mine are at least as quiet as stock even with .551" lift at the valve and 125# of seat pressure from the Crane 832s

 

Once again I don't believe these rockers will do anything that can't be done with a cam. The question still remains how much do these rocker arms cost, for some reason the VHP touts avoid answering.

 

After 36 years of racing and testing, it is our position that you cannot duplicate gains made from cam and rockers, with just a cam.
The rocker arm package consists of the rockers, screw in studs, guideplates, polylocks, and .080 wall chromoly pushrods in proper length. You can find the price, which is $669.00 on our website, or in the Nov issue of GM High Tech and Oct issue of Corvette Fever in our advertisement. If you have any questions about the rockers, here is a link to read and you can call us at
1-866-462-4500.
http://www.vincihighperformance.com/...1MAINPAGE.HTML

 

i know how hard it is to just go to the site and look up the price. and i've posted in other threads the price when asked. and have given links. i must've missed it being asked in this thread. so here goes.

the super web deals link off the main page.
http://www.vincihighperformance.com/superwebdeals.HTML

the parts special link off the main page
http://www.vincihighperformance.com/superwebdeals.HTML

the valvetrain link off the main page
http://www.vincihighperformance.com/superwebdeals.HTML

click the fbody link off the main page, then click LS1 and you get this page. http://www.vincihighperformance.com/fbodyls1.html then click engine on the left side.

click the corvette link off the main page, then click LS1 and you get this page. http://www.vincihighperformance.com/...1MAINPAGE.HTML then click engine on the left side.

for the LS2 guys, click corvette off the main page, then LS2 and you get this page http://www.vincihighperformance.com/...0MAINPAGE.HTML then click engine.

for the GTO guys click GTO off the main page and you get this http://www.vincihighperformance.com/GTOMAINPAGE.htm then click engine.

and finally for the truck guys click trucks and SUV off the main page and you get this http://www.vincihighperformance.com/SUVGMMAINPAGE.HTML then click engine.

the pricing is $669.00 for either the 1.7 or 1.8 rocker kit. Kit contains rockers, studs, guide plates, lock nuts, and pushrods.

sorry for any inconvience this may have caused anyone that asked for the price and we didn't catch it.

 

well, then i guess two dynojets i've been on are crappy ones then.

my 99TA i had for about 3 weeks. all found here http://stealthram.com/1999TransAm.html

hood closed vs hood open.


then when i changed the spark plugs with hood open brought it up another 10rwhp ( plus dyno of 150 n2o on this one included)


then the wife's car with the borla catback on it. hood closed vs hood open

now of course these are off of VHP's dyno.
then we have my current car http://stealthram.com/2000pontiacformula.html

on a completely different dynojet. all stock with hood open. now i just showed on two different LS1 cars, the hood costs you 10 rwhp so, subtract that from this dyno sheet.


alot of people complain about VHP's dyno being lower than others. but what VHP does is keep the hood closed (because you drive it that way on and off the track), and bring engine to operating temps (as it would be driven). this is how they baseline it. as it was given to them.

 

Bigdsz...I don't think anyone is saying that these rockers are going to replicate a big cam...But for guys that don't want to completely tear an engine open, they do offer the same benefits of at least a bigger cam than stock...Also, the comparison of full roller rockers to that of the factory units just in terms of parasitic losses and less wear and tear on the valvetrain makes them a justifiable bargain in my opinion...

Peace...Gman

 

FWIW, I just happened to open up "Smokey Yunick's Power Secrets" published by SA Design last evening. On pages 83 and 84 he is talking about achieving a more radical opening rate of the valve. He talks about 3 ways of achieving this: 1) change the lobe profile, 2) increase the lifter diameter, or 3) increase the rocker ratio. After discussing the pros and cons of each method, Ole Smokey says, "So in my opinion, if you are in a situation that calls for increased "valve action" and you are considering these three options, I feel that raising the rocker ratio is unquestionably the best choice." Now that's just Ole Smokey's opinion and he surely wasn't always right, but after all of the testing he did, this comment speaks volumes. BTW, most of what is claimed to be "modern science" and is quoted on this website can be found in one form or another in Sir Harry Ricardo's book " The Internal Combustion Engine" , published in England in 1927. Nothing is really new with the ICE, just better materials and electronic management of air, fuel and spark and other control factors!!

 

Here, here!

 

Steve I'm a little surprised by your position on these variable rockers. To me it's so evident that you are increasing the valve train stress by using these rockers, they may not increase the lift but certainly accelerate the ramp rate. Let's assume that you are already running an XER or close to XER lobe and you install these rockers, is it not going to accelerate valve train wear, particularly spring deterioration? The above comment, credit given to Smokey Yannuk is true to a point but the larger cams being run in these LSX series engines are cutting edge any further change in valve train geometry could be curtains for the engine.

 

Please explain your opinion with specific backup facts or data, because the only thing that we have found that is stressed more is the pushrod and it would be stressed more with a quicker ramp, so how can it be "curtains" for the engine. We certainly haven't found this in our R&D at Crane and our job is to break parts before you do!!! I'm not trying to come across heavy, we are always open to new thoughts and ideas. I admit that we don't have all the answers, but we try to add to our knowledge base everyday and we appreciate outside suggestions. Mark Campbell

 

Mark, Why are Crane's new rockers quieter ? Is it Crane's recommended preload adjustment (equaling 0.090-0.100 compression) or is it the barrel shaped roller bearings.

 

Proper preload is fundamental to keeping the valvetrain quiet. Many people on this site fail to recognize how much preload changes with an aluminum block and heads as compared to cast iron components. The main reason that our rockers are quiet is due to the quality and special crowned design of the needle bearings combined with the amount of oil we allow to the bearings to keep them quiet and cool. The subtleties in rocker design are enormous and we have only recently revealed a few. In the next several months we will reveal many more (many of which are all ready in our current product line, but we just haven't explained them well) and these all add HP and reliability. We are constantly improving our products to give both!!

 

Verygood answer. THANKS

 

Mark, I'm an old timer when it comes to engines, I've been working on them for 40+ years, in fact in the late 60's and early 70's I supplied cutting oil to Crane at their plant in Hallandale. That being said, the point that I'm trying to make is that I do not believe that using Cranes' new rockers with a close to maxed out cam, particulary duration, is a good idea. Just like a big cam stresses valve springs and shortens their life, I believe the new rockers will do the same. I also maintain with the increased duration, if you already have something like a XER lobe, and valve float occurs there could be catastropic results.

Surely these rocker could be used on a stock or mild set up, but what would be the point you would be better off using regular 1.8's or 1.85's and getting the extra lift. Better idea than that even,to do it right, is to install a Crane Cam.

 

Joe Vinci, I sent you a PM. I have an 02 ZO6, I recently purchased a set of the crane 1.89 rockers off of your site along with the pushrods, the whole deal.

I was concerned with P to V clearance issues as I was unaware the lift at peak was 1.82 not 1.89. With an 02 LS6 cam (.551/.547) the lift wouldve been at .613/.608, but if the ratio is indeed reduced to 1.82 that brings the max lift #'s down to a less questionable .589/.585.

Is this correct? Anyone? I hope so as I would love the new lift #'s under .600! I shouldnt have any P to V problems with .589/.585 right?

 

We are not having any problems at that lift. Of course we are using our valve springs as well. Just make sure that the valve springs you are using are fully capable of maintaining that lift so you don't lose spring tension and end up with valve float or coil bind. Then you will be having problems. Joe.

 

I bought and installed a new set of these rockers last month from Vinici, with 1.79/1.72 ratio. So far I'm happy with the set-up- I also installed an 062 cam on my Z06. Power & torque increased 20-40hp and torque thew out the power band. About the only thing that is a slight issue at this time is:

My valve train is a bit noiser from idle to about 2K rpm's. The typical sewing machine noise commen on most LS1/6's got a bit louder. Other than that-she run's like a bat out of hell.

Thank's Joe & Vinici.