Has anyone done a "before and after" 1.5 vs 1.6 rockers? I know you gain about .030 lift, and it will make the ramp "faster". I was wondering if anyone has done ONLY this change and seen E.T. results?
1.5 vs 1.6 rockers
- Thread starter 318willrun
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Along with that, if a lobes specs (duration at the various lifts) are based on a 1.5 ratio and you use 1.6 instead, what would the duration specs increase by then, typically, in general, or roughly... short of actually measuring.
dartfreak75
Restore it, Dont part it!
Following I'm curious about this topic too!
hopefully SOMEBODY here has tried it and can report on it, or else it will be another thing I'll have to add to my bucket list
j par
Well-hung Member
I've done it but no Apples to Apples timeslips. I always change too many things...
Very simple to figure. Here we go.
To figure what lift will be from 1.5, divide the lift at the valve by 1.5. This figure equals lobe lift, which is the actual lift of the camshaft lobe without rocker ratio influence.
No, take the lobe lift figure and multiply that times 1.6 and you have your new lift number using 1.6 rockers.
Is that what you were asking?
To figure what lift will be from 1.5, divide the lift at the valve by 1.5. This figure equals lobe lift, which is the actual lift of the camshaft lobe without rocker ratio influence.
No, take the lobe lift figure and multiply that times 1.6 and you have your new lift number using 1.6 rockers.
Is that what you were asking?
The duration does change, although VERY minimally. Something on the order of plus or minus 2*. It is a very negligible amount. It is fair to say the difference is all in the lift.
And no, it will not make the ramp "faster". Only modifications to the ramp on the lobe itself can do that.
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dartfreak75
Restore it, Dont part it!
My question is, is there a cheaper budget set of 1.6 rockers? The harland sharps cost nearly a grand that just seems ridiculously expensive to me.hopefully SOMEBODY here has tried it and can report on it, or else it will be another thing I'll have to add to my bucket list
j par
Well-hung Member
I'm not sure what's necessary about them except for maybe trying to get a little bit more out of a can and not having to change the cam? Just use one point fives and get a bigger cam...
Well, what I was really asking is if anybody went from 1.5 to 1.6 testing before/after results at a drag strip.
But not really looking for different ways to add lift, just wondering if anyone has gone to the 1.6 from 1.5 and has made a difference on the ET slip.
I haven’t went from 1.5 to 1.6 but I have went from stamped steel to to cast iron adjustables. Car was a 67 dart GT 1970 340 re ringed with the purple shaft 284/484. 727 with factory hi stall and 3.55 gears. It ran a 13.35 1/4 mile. After the change 13.22. Kim
thanks... appreciate it
The stamped rockers are anywhere from 1.43 to 1.45. I also set the preload to .006 Kim
I know late 90's street renegade class of FFW had camshaft limitations, the class leaders were running 1.73 ratio on thier exhaust and 1.6 on intake. I dont know by how much the increase was but know that they say it works.
Well it was clear as mud the way you asked it. At least to me.
"It just does". I cannot tell you why, because I am too stupid. But it does change. I've seen it on the degree wheel and talked to others who have experienced it, as well as read up on it. I just do not know the exact answer.
j par
Well-hung Member
It just does...
I cannot tell you why LOL....
Translation: I'm just jabberin to be jabberin....
No. I am speaking fact. It happens. I am admitting that I don't know WHY something happens. Your quote above was the useless one. Totally and completely.
j par
Well-hung Member
Don't get me started on what's totally and completely useless LOL...
Sure got you to respond quick...
FISH ON!!....BAhahahaha....
But who contributed to the thread and who did not?
Oh and congratulations, smartbutt. You made the cut.
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