We're currently in the design phase of rocker arms for the ECOTEC. Seeing as there are no aftermarket units, other than Jessel which are a pretty penny.

The unit body will be made from 6AL-4V, while the roller, needle bearing and shaft will be from carbon steel. The tip of the rockers will not be roller tipped. Rollerizing the tip, from what myself and ray bates found, does not reduce friction for such a small sweep angle and valve tip head. The radiused area actually is better for performance. More info to come as well as a sneak peek pic. The new rockers will be tested against stock units in all areas of fatigue and running in an upcoming motorized jig that simulates rocker operation with oil and heat.

There's been a couple complains of the stock units cracking and even breaking in stock applications. This way people doing builds will have an opportunity to chose a non-stock rocker, and we're confident the price will be much cheaper than the Jessel units.

Thanks,
JBP

Can you design us new pushrods, too?! :p

Sounds good, keep us updated!

I look forward to seeing these as well as having them in my engine. :thumb:

dumb question, but what do they do?

not bad, my motor build is still a few weeks off, when you think they will be ready for production

dumb question, but what do they do?

+1 :lol: I have no idea what they do...

+1 :lol: I have no idea what they do...

if im notmistaken they are on the head powered by the camshaft in order to open/close valves.

I thought that was a tappit

That will be a great product for us! They will make it more reliable in the upper rpm with cams!
Thanks JBP!

rocker arms are like a weight in a way...one end is raised and lowered by the lobes on the camshaft..the other end sits on the valve stem. When the camshaft lobe raises the outside of the arm it presses down on the valve stem opening the valve. When the outside of the arm is lowered by the camshaft it allows the spring to close the giveer

Rocker arm
From Wikipedia, the free encyclopedia


Generally referred to within the internal combustion engine of automotive, marine, motorcycle and reciprocating aviation engines, the rocker arm is a reciprocating lever that conveys radial information from the cam lobe into linear information at the poppet valve to open it. One end is raised and lowered by the rotating lobes of the camshaft (either directly or via a lifter (tappet) and pushrod, while the other end acts on the valve stem. When the camshaft lobe raises the outside of the arm, the inside presses down on the valve stem, opening the valve. When the outside of the arm is lowered by the camshaft, the inside rises, allowing the valve spring to close the giver.

The effective leverage of the arm (and thus the force it can exert on the valve stem) is determined by the rocker arm ratio, the ratio of the distance from the rocker arm's center of rotation to the tip divided by the distance from the center of rotation to the point acted on by the camshaft or pushrod.

For car engines the rocker arms are generally steel stampings, providing a reasonable balance of strength, weight and economical cost. Because the rocker arms are part of the reciprocating weight of the engine, excessive mass limits the engine's ability to reach high operating speeds.

I thought that was a tappit

lifter tappits are used when its lobe isnt opening it directly

the rocker arm is the piece that sits on the push rod with a pivot in the middle then to the valve. basically a teater-totter with the pushrod under one end and the valve under the other.

:confused:

Like sincerely I keep seeing pushrod.

On an OHC motor?

heres a pic right above valve.

http://cobaltss.net/gallery/files/2/0/0/8/8/32227.jpg

AHHHH ok

lololol I see it now

But it looks like theyd be on a push rod motor only...:confused:

OHC=ecotech, sh** forgot about that, but same thing in principal.

:confused:

Like sincerely I keep seeing pushrod.

On an OHC motor?

if u look at the closer camshaft to u to the far right just below the camshaft pressing on the spring...thats the rocker arm

http://www.gti-vr6.net/library/engine/24v.jpg

so all in all i was kinda right. lol. Ive have worked on engines when i was a child so i get the main idea of things but not the specifics.

Can you design us new pushrods, too?! :p
Sounds good, keep us updated!

New pushrods COMING UP!!! ;)

+1 I have no idea what they do...

Guys, just so we know, the "rocker arm" in these engines is actually a follower. There's big difference between the two. And whats with all this talk about pushrods! See what you started NOS2006. :)

So, the lifter end of the follower in this example is the pivot point, versus the fulcrum of a typical rocker arm being actuated by the pushrod.. Thats the big difference between a follower and a rocker arm.

Here's a pic of what Jessels ones look like:

http://www.jeselonline.com/v2/images/Followers/2.jpg

New pushrods COMING UP!!! ;)



Guys, just so we know, the "rocker arm" in these engines is actually a follower. There's big difference between the two. And whats with all this talk about pushrods! See what you started NOS2006. :)

So, the lifter end of the follower in this example is the pivot point, versus the fulcrum of a typical rocker arm being actuated by the pushrod.. Thats the big difference between a follower and a rocker arm.

Here's a pic of what Jessels ones look like:

http://www.jeselonline.com/v2/images/Followers/2.jpg

lol thats what i posted of that german engine lol

if u look at the closer camshaft to u to the far right just below the camshaft pressing on the spring...thats the rocker arm

http://www.gti-vr6.net/library/engine/24v.jpg

I UNDERSTAND NOW


BTW vr6 FTW:cool:

lol thats what i posted of that german engine lol

right! same difference. ;)


not bad, my motor build is still a few weeks off, when you think they will be ready for production

The design is complete, we have to construct the first prototype and test it rigorously. They should be ready for production after 2 weeks of testing. The prototype will take approximately 1 month to manufacture. So these babies will be hitting the streets if all goes well in 8 weeks.

u should let me test them on my car lol check out my engine build in my sig

what kinds of gains are going to be associated with this new part??

and hp? or what should be the benefits of this new design?

the benefits is a stronger head to support the power u want to build...

u should let me test them on my car lol check out my engine build in my sig

Nice build. But we've got all the testers we need for this one; We'll keep you in mind though.


what kinds of gains are going to be associated with this new part??

and hp? or what should be the benefits of this new design?

Good question... Raven SS got the majority of the question right. Its going to be stronger, much stronger. Being made out Titanium gives it an edge of strength and weight reduction. Weight reduction isn't that much of a concern as the follower weighs little to begin with and does not perform the same function as a rocker arm does. Continuing, the shaft of the rocker will be lubricated and the roller will see small amounts of oil as well to cool down during endurance runs and extreme use. There's a friction reduction channel in the center of the roller as well as tighter tolerance on the needle bearings. And of course lets not forget the CNC Titanium rocker body.

These rockers will be serious units gentlemen. We're going all out on them.

what kinds of gains are going to be associated with this new part??

and hp? or what should be the benefits of this new design?


After seeing that you have 2.2L in your name, I forgot to mention that these rocker arms will be compatible with every 4 cyl ecotec, L61, LE5, LSJ and LNF

Here's our release the pics of the rocker arm... Drool over these bad boys:


http://cobaltss.net/gallery/files/8/5/0/1/jbp_ti_rckr1.jpg






http://cobaltss.net/gallery/files/8/5/0/1/jbp_ti_rckr2.jpg

Sweet.
I really like that pink hue on the front edges :p:

Sweet.
I really like that pink hue on the front edges :p:

You like??

Psst, Been up since 6am `cause of someones car, be nice! ;)

You like??

Psst, Been up since 6am `cause of someones car, be nice! ;)

Really I like them, they look good.

And I am being nice, I haven't phoned you yet and besides today is a big day. :)

Really I like them, they look good.

And I am being nice, I haven't phoned you yet and besides today is a big day. :)

I haven't called him yet. He still have a chance to cancel. :nuts::)

I haven't called him yet. He still have a chance to cancel. :nuts::)

Now who isn't being nice:nono:, guess I am flying to TO. :lol:

lol damn man

Ok guys, We're really gonna move these babies through our dealers... The Jessel ones are $2300 bucks. :cussing: We're looking at a set of our titaniums to be at the introductory price of around $900-$1100 MSRP for the first two months of product release!!! :twothumbs

Bug your favourite dealer for even better deals by organizing a Group Buy!!

That should make some people happy.

When do you expect them to be ready?

That should make some people happy.

When do you expect them to be ready?

We're getting the prototype in two weeks. If it passes, then another 2-3 weeks after that!

Here's pics of our Titanium Rocker arm body. Solid 6AL-4V, these are beauts! Now comes testing!

http://cobaltss.net/gallery/files/8/5/0/1/20080225_020.jpg

http://cobaltss.net/gallery/files/8/5/0/1/20080225_019.jpg

While they do look great I have a couple questions that I may have missed the answer to. So if I may, What will the advantages of these be? In other words will they be offered in different ratios to effect the valve lift? If so how much over stock? Or can't that be done?

Basicly when all is said and done what will my $900 to $1100 be getting me?

The advantage over stock comes in several forms. Of course, titanium is about twice as light as steel and has a great strength property (in terms of weight) in comparison to steel. Weight isnt the determining factor in our decision to make these rocker arms, however, we made these to be replacements for people running high spring pressures, high lift camshafts. The stock rocker arms break during extended power runs, they are not up to the task of handling extreme duty.

So if you're just looking to buy these for the bling factor, it would be money wasted. You buy these to save your valvetrain when you've beefed up your motor.

The stock ratio is maintained. (1.7:1)

Will these be different ratio or just higer quality replacements?

Good stuff JBP, now make us a return fuel system-kit and you'll have even more people knocking down your doors.

someone needs to make a return style... alot of people would go wild over one including myself

subscribed

Ok cool. So these are for the guy who already is running a nasty cam and heavy duty springs, won't do anything for us who don't.

Will these be different ratio or just higer quality replacements?

Stock Ratio. Yes, much better quality (CNC'd Titanium) as opposed to stamped steel.

Ok cool. So these are for the guy who already is running a nasty cam and heavy duty springs, won't do anything for us who don't.

Right, except for slightly less weight.

Good stuff JBP, now make us a return fuel system-kit and you'll have even more people knocking down your doors.

someone needs to make a return style... alot of people would go wild over one including myself

Sure, that's a walk in the park. We've already got one designed for Rods 1200HP car. Although his is a fuel cell design, we can definitely make something rather quickly for the delta. Let's make another thread and see the interest for such a system w/an AFPR and stainless or nylon lines.

would i need these for your stage 2 tri flow cams and springs?

are you making a thread for the return fuel system?

We recommend them now that there is a replacement rocker arm. If you intend on doing any racing of the sort, a rocker arm that is stronger, lighter and better lubricated is less likely to fail.

Any possiblities of a higher ratio??

higher ratio?... not likely unfortunately.

time to ressurect this from the depths.. this project has fallen to the way side... the titanium is proven difficult to machine true dimensions, thus making the rocker geometry offset incorrectly..

so were looking at new materials to make the rocker body...

just saw this. i'd love to get some from you rather than 2300 from jessel.

el bump-o from el dead-o

lets get these on the rd. how they coming?

we actually have to get these ready for Victory_Reds race car... But my time is currently occupied in the software department. Serial communication is a real pain to code and timing is everything.

at this moment, they need a slight redesign before testing.. but they will be offered as a product and not fall into the depths of "shoved to the way side for something better"

^hooray for JBP, you've always handled me well. i'd def. like to look into these as i will be getting GMR Valve Springs and Adjustable cam gears, these will only help more :twothumbs