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T/A Adjustable Rockers #221033
02/11/09 11:58 AM
02/11/09 11:58 AM
Joined: Mar 2003
Posts: 15,478
the boonies
aarcuda Offline OP
I Live Here
aarcuda  Offline OP
I Live Here

Joined: Mar 2003
Posts: 15,478
the boonies
Has anyone ever measured their ratio to see if they are 1.5 or something less? I am running the T/A heads with the stock offset adjust T/A rockers (bushed and rebuilt by RAS).

Ive never measured the ratio on these but I am am curious as to how close to 1.5 they are. I know there is a company that sells some really high dollar T/A offset rockers but they were close to $1000 if i recall. I wouldn't even consider that kind of expendature unless I knew my current rockers were shorting me on lift

Re: T/A Adjustable Rockers [Re: aarcuda] #221034
02/11/09 01:11 PM
02/11/09 01:11 PM
Joined: Jan 2003
Posts: 5,893
Florida
Locomotion Offline
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Locomotion  Offline
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Joined: Jan 2003
Posts: 5,893
Florida
If RAS rebuilt and bushed them, they should be closer to advertised than OEM. But with all the variables, including the OEM lifter and pushrod angles, a true 1.5 rocker will still not give 100% of the advertised lift. If you need a precise lift, you would need to go a little bit over on the rocker ratio or a little bit over on the cam lift to make up for the less than optimum geometry.

Either way, you would need to do a lot of measuring making sure to have the lifter pushrod cup is in the exact same location as the lifters you're using. Hydraulics will collapse a bit and using a different pushrod cup height and/or different length pushrod will throw off the measurements.

Re: T/A Adjustable Rockers [Re: Locomotion] #221035
02/11/09 02:01 PM
02/11/09 02:01 PM
Joined: Mar 2003
Posts: 15,478
the boonies
aarcuda Offline OP
I Live Here
aarcuda  Offline OP
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Joined: Mar 2003
Posts: 15,478
the boonies
i don't need a precise lift. I just want as close as possible. i was reading all these posts about different combos and such and see their hp dyno numbers and notice that theres a lot of variation between very similar builds using cams that are very close.

so i got to thinking about rocker arms and how if a factory rocker arm ratio for the stamped steel rockers were only 1.46 or so, that that may be a big factor as to why that particular motor didnt make as much power as someone with some aftermarker rockers that were right on 1.5 ratio.

So then i thought "what about my TA rockers? are they 1.46? less? closer to 1.5?" I donnt know cause I never checked. I'd like to get as much out of my egine as possible and a rocker arm change is easy. not cheap at $1000 but easy...

so i figured I'd ask if anyone ever checked them







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