I won't spend that much on the whole engine.
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| YellaTerra 1.5:1 Ratio Platinum Roller Rockers https://www.slantsix.org/forum/viewtopic.php?t=64793 |
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| Author: | justa170 [ Thu Apr 23, 2020 7:24 am ] |
| Post subject: | YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
Super-fancy roller rocker setup, anyone? http://store.yellaterra.com.au/chrysler ... r-rockers/ I'm not feeling *quite* so flush, so I'll pass, but BOY do those look cool. |
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| Author: | Badvert65 [ Thu Apr 23, 2020 7:54 am ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
$1800 AU, YEE_OUCH!!! But they ARE cool. |
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| Author: | drgonzo [ Thu Apr 23, 2020 7:57 am ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
I won't spend that much on the whole engine.
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| Author: | Greg Ondayko [ Thu Apr 23, 2020 8:00 am ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
Looks cool. Hopefully they oil correctly. I would think think that they should be in 1.6 ratio too.. Heck, its cool just to see someone making parts for these engines... so I can't complain. Costs about $1150 USD. Not sure if that includes shipping. Greg |
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| Author: | Dart270 [ Thu Apr 23, 2020 9:49 am ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
A bit salty, yep, but they look nice. If I did not have evidence of good oiling/durability on a street or road race engine, I would not buy them. Lou |
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| Author: | slantzilla [ Thu Apr 23, 2020 10:53 am ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
They appear to be cast and on needle bearings on the shaft. 2 things that frighten me. In all honesty, unless I am running some crazy valvespring stock rockers are fine. I have a set of 1.6 RAS/Cox rockers. They are really cool looking, but back to back to back testing on my old junk showed them to be not much more than eye candy. |
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| Author: | CNC-Dude [ Thu Apr 23, 2020 10:59 am ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
You would think they could've at least found a cleaner cylinder head to display their products on.... |
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| Author: | Ron Parker [ Thu Apr 23, 2020 11:17 am ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
I ran a set of ras roller rocker for years very little performance gain over stock but they stayed adjusted right on the specs.I could check them at the start o season and not adjust them all year long. Thanks Ron Bagels second or third friend 
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| Author: | drgonzo [ Thu Apr 23, 2020 5:57 pm ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
Looks like they are available in 1.65 ratio. https://store.yellaterra.com.au/chrysle ... r-rockers/ |
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| Author: | Greg Ondayko [ Thu Apr 23, 2020 6:14 pm ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
They have a new 12 port head... but its for holden inline 6. Greg |
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| Author: | DadTruck [ Thu Apr 23, 2020 7:49 pm ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
Roller rockers will have less friction, but the friction reduction across the small hardened valve tip would not necessarily give a measurable increase in HP. What roller rockers will do is put much less side loading on the valve stem - valve guide interface. That gets important when valve action gets really fast with really large valve lifts. Keeping the valve head exactly centered on the valve seat when the valve closes means a better seal, minimal leakage, more efficient combustion, less chance of burning a valve,,, roller rockers are used to reduce the chances of future failures, not necessarily to show an increase on a hp chart. |
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| Author: | GregCon [ Thu Apr 23, 2020 8:12 pm ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
That's actually a cheap price for something made out of platinum. Roller tip rockers....they really don't put less side loading on the valve stem, if compared to a pad type rocker that is properly set up. But, since about 1% of the people out there set their valvetrain up properly, the roller tip shines because it does help with side loads when installed on an otherwise 'out of spec' setup. If the rocker is rocking on the proper radius and positioned properly relative to the valve stem, there are no side loads. I talked to Ray Barton years back and he told me they put a thin piece of paper between the valve tip and rocker pad while they rotate the engine through a cycle. If the rocker is rocking properly, the contact will be in a single straight line across the tip, and the paper won't be torn. There's no friction or scrubbing. |
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| Author: | DadTruck [ Fri Apr 24, 2020 7:31 am ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
here is an ez way to check rocker to valve tip alignment. https://www.lunatipower.com/how-to-veri ... n-geometry even with rollers the alignment can be wrong, and side load the valve to some extent. With proper alignment and rollers there is no side loading, the roller is moving back and forth across the center of the valve tip. with standard rockers and proper alignment there will still be side loading due to the skating action of the rocker as it moves across the valve tip, but the side loading is minimized. |
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| Author: | CNC-Dude [ Fri Apr 24, 2020 7:56 am ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
And probably the most beneficial gain from a quality roller rocker is having all 6 intake and all 6 exhaust valves opening fully the way the cam manufacturers intended, by having a true and consistent rocker ratio. Something that stamped factory rockers cannot do. Just because you will likely never see a 10 or so HP gain at the drag strip, doesn't mean the engine didnt see a gain.... |
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| Author: | Dart270 [ Fri Apr 24, 2020 8:18 am ] |
| Post subject: | Re: YellaTerra 1.5:1 Ratio Platinum Roller Rockers |
Nice discussion, folks. Thanks. Lou |
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