1.6 Rocker Arms for /6

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6pakattack said:
So is it the Kerf from the cutting blade that changes the fulcrum point to 1.6 ?? And,would you be offering your services as I don't have the smarts or tools to do this !!:prayer:
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I don't know what thickness of the blade that Aaron used to do this slice, but the one I used was .102". That ended up with about a .104" cut, which was just right. Manhattan Supply (MAS) has those blades. They're about $85.00 apiece, but the have free next-day-air shipping, which is nice.

But there's no need for 1.6:1 rockers if you can use a cam with a lot of duration; the problem comes with turbocharged engines wherein you CANNOT use a lot of duration, but want .500"-lift. Can't get a cam ground with short duration and that much lift; the lifter edge will bite into the cam lobe (on such a steep lift ramp,) and destroy the cam in short order. Hi-ratio rockers is the only answer...
If your engine is normally aspirated, I think you can get a cam ground with plenty of lift (with stock rockers,) since the duration is so much more. No problem.

Save your money...
 
6pakattack said:
So is it the Kerf from the cutting blade that changes the fulcrum point to 1.6 ?? And,would you be offering your services as I don't have the smarts or tools to do this !!:prayer:
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I have four sets of rocker arms if this process works the way me and Bill are hoping I might do up the other sets but my turbo build is my top priority so ask me that question in a week or two and we just might beable to work something out
Aaron
 
srixon4406 said:
I have four sets of rocker arms if this process works the way me and Bill are hoping I might do up the other sets but my turbo build is my top priority so ask me that question in a week or two and we just might beable to work something out
Aaron
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Jeff Colvert (the same guy who welded up our header) has agreed to weld these rocker arms for us. He lives about an hour-and-a-half away, so I'm taking them to him tomorrow to put the pieces back together.

Wish I could do it myself, but whatever meager skills I have, they don't include welding.... :angry7: Not EVEN...

I'll post some pictures when I get them back. Maybe I'll have a better camera, by then...

Then, they go back to the heat treatment facility for case-hardening (as per original.)

Hope they work...:prayer:
 
My question is has either of you actually made a measurement to verify what you're doing?
 
StrokerScamp said:
My question is has either of you actually made a measurement to verify what you're doing?
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I haven't yet I do have one of them tacked together that I'll mike them and report back my measurements but Bill has done the math on just how much material needed to be removed. I have the rocker arms at work and I'm off for a couple days but ill try and post a couple pics with some measurements
 
Cool. Please keep us posted. This is the kinda thing that gets stuff figured out. Just jumpin in and doin. Thanks for all the good info.
 
StrokerScamp said:
My question is has either of you actually made a measurement to verify what you're doing?
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The overall "working length" of these rockers appears to be 2.979" (1.788" on the valve side plus 1.191" on the pushrod side.) The shaft bushing has an internal diameter of .876" . That, of course, is irrelevant, for the sake of this discussion.

If you divide the long-side figure by the short side length, you get 1.50".

Subtract .100" (the amount I cut out of the short side, leaving 1.050") and divide it into the valve-side length (1.788",) you get a ratio of 1.70:1, which, given the propensity for these stock rockers to fall somewhat short of the nominal 1.5:1 ratio (they're usually 1.40:1 or worse,) should put them right close to 1.6:1, once they're cut and re-welded. That's about as close as I could get it.

I don't understand what was going on at Chrysler, to allow the OEM variations in this ratio, but everyone who has actually tested the stock rockers has confirmed that the ratio of these rockers always falls far short of the advertised 1.5:1. Usually, they test 1.35 to 1.40:1.

Go figure...:eek:ops:

Then, it's back to the heat-treating facility to regain the hardness to the original Rockwell spec.
 
That makes sense, Bill. I will be interested to see if someone can can acheive and duplicate an actual measured 1.6 or 1.7. In fact, I would be happy with a true 1.5.
 
That's a dang good improvement.
 
StrokerScamp said:
That makes sense, Bill. I will be interested to see if someone can can acheive and duplicate an actual measured 1.6 or 1.7. In fact, I would be happy with a true 1.5.
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I hear you!!! I will put a dial indicator on the rocker at the valve end, and measure actual lift, rather than try to build a jig to simulate the setup. I'll be sure to report on what I find, but it will be awhile; We are going to get this thing "operational" (getting close) with the stock rocker arms first.

Stay tuned.... and, thanks for your interest!:D
 
Damn,looks like it's been a while since I posted anything in my own thread !!Well,it Looks like my Roller Rockers should be on their way in the next couple of days !!Seeing as it's Friday,they should ship out Monday !! These should be the last piece to the puzzle,unless I hear from Frank about a head he's working on for me !! Just about done with my latest Honey Do Project,so it's time to get off my dead and onto my dieing and start putting the puzzle together !! Things usually happen in threes,so maybe I'll also get lucky and be able to drop the Dart off for the body work,and then the Tranny !! !!
 
6pakattack said:
Damn,looks like it's been a while since I posted anything in my own thread !!Well,it Looks like my Roller Rockers should be on their way in the next couple of days !!Seeing as it's Friday,they should ship out Monday !! These should be the last piece to the puzzle,unless I hear from Frank about a head he's working on for me !! Just about done with my latest Honey Do Project,so it's time to get off my dead and onto my dieing and start putting the puzzle together !! Things usually happen in threes,so maybe I'll also get lucky and be able to drop the Dart off for the body work,and then the Tranny !! !!
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Can I ask you a question where did u purchase the roller rockers and what was the damage
Thanks Aaron
 
Spoke with Trent at Rocker Arm Specialists,,
they have part number PL33HR,, which is a complete 1.6 ratio rocker arm set up with on a rebuilt shaft for 290.00 + shipping

I am buying a rebuilt (cleaned -chromed-ground) shaft from them,, 58.00 + shipping and saw the 1.6 ratio rockers on their web page....

the phone there is 530-378-1075
 
I have been calling them about every two weeks (last week was my last call) and each time I get the same story. "They are about a month out due to the adjuster screws working out" is all I get. I will be glad to see when they get delivered. I might think about buying product when I see them in someone's possession and see that they actually exist.
 
Here's some pics for you !!!

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I was impressed with them !! Dropped them off to the guy that's going to be building my motor,and he was impressed too !! I know 805 had some concerns with the size of the oiling holes,but Ben didn't see any problem with them at all !! And with this guys knowledge,I feel comfortable my motor will be just fine !!Can't wait 'till I find out the ACTUAL compression ratio,I may just have to join Bill in his ventures,only with a different approach !!
 
Nice. Are those the 600 buck pieces? What was the turn around time?
 
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