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Old 12-09-2017, 09:24 PM   #1
Shaky93

Name: Shaky93
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Changing rocker arm ratio

So I have the opportunity to purchase a set of very nice roller rockers for my triple turbo 12v DPC build for a pretty good price, but they are 1.8, I was planning on going to roller rockers to fight rocker arm deflection anyways but in 1.6 maybe 1.7. I'm using a 194/220 cam, head flows PLENTY, and I have more than enough valve relief to accommodate the extra lift, my question is what will the higher rocker ratio do to the overall drive ability of the engine? Beings it needs to be somewhat streetable to finish well in all the events. I've got no experience messing with rocker arm ratios just looking for a little bit of advice. Thank you!

Here's What we're working with Click the image to open in full size.
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Last edited by Shaky93; 12-09-2017 at 09:27 PM.
 
Old 01-16-2018, 04:07 PM   #2
thinair
 
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I would like to know more on this subject as well.
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94 12v. NV4500 Valair twin disc, Seth stage 4, DDP 5x14, 024 dv. Fass 260. T4 ATS. 362sxe. 150 ii springs.

2012 3500 CCSB. Thuren 2.5 kings, DT Profab radius arms. Carli LT Airbags/Sway Bar
 
Old 01-17-2018, 04:34 PM   #3
Stormin08
 
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I believe the LSA is going to be key, on a forced induction motor...the overlap, if too great can cause power loss.

What is the LSA of said cam ?
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Old 01-17-2018, 06:45 PM   #4
thinair
 
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110 lsa
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94 12v. NV4500 Valair twin disc, Seth stage 4, DDP 5x14, 024 dv. Fass 260. T4 ATS. 362sxe. 150 ii springs.

2012 3500 CCSB. Thuren 2.5 kings, DT Profab radius arms. Carli LT Airbags/Sway Bar
 
Old 01-21-2018, 01:20 PM   #5
mfsuper90
 
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Interested As well
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Old 01-21-2018, 02:33 PM   #6
jones95runner
 
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Just my , but you need to figure you max lift with those rockers, and you need to know your flow numbers of your head at various lifts,

Aftermarket heads are not so bad, but oem cast 12v heads had a wall where with too much lift they actually lost cfm/power. From what I remember was somewhere in the. 600" lift range.
 
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