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Differences between 1.5 and 1.6 rocker arms....... #178274
12/29/08 07:27 PM
12/29/08 07:27 PM
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SKR8PN Offline OP
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My question is, do they move the pushrod adjuster or the roller tip,or BOTH to get the change in ratio difference??? I have Harland Sharp 1.5's and am considering going to 1.6's, but need to finish checking clearances first,and am clueless as to where the change will effect stuff the most......like valve roller to stem and pushrod clearance's in the head.


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Re: Differences between 1.5 and 1.6 rocker arms....... [Re: SKR8PN] #178275
12/29/08 07:29 PM
12/29/08 07:29 PM
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Pushrod moves closer to the shaft as the ratio goes up. So check the bottom side of the pushrod for clearance.

Re: Differences between 1.5 and 1.6 rocker arms....... [Re: SKR8PN] #178276
12/29/08 07:34 PM
12/29/08 07:34 PM
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i'm in the same boat as you just bought HS 1.5s this past season have 25 runs on them now probably going to switch to T&D 1.6s for the new motor.

Re: Differences between 1.5 and 1.6 rocker arms....... [Re: SKR8PN] #178277
12/29/08 07:54 PM
12/29/08 07:54 PM
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Check your current set for the accuracy, my 1.5 are actually 1.54 to 1.56, same on the new set of 1.6, (actually checked at the retainers 1.64 to 1.66) that I bought three years ago I use a ail indicator and set the lash at zereo, measure the actaul lift at the retainers and do the math, lobe lift times the ratio for theoritical lift versus actual lift at the retainers


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Differences between 1.5 and 1.6 rocker arms....... [Re: Cab_Burge] #178278
12/29/08 08:14 PM
12/29/08 08:14 PM
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ELYRIA,OH
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i checked the actual lift on the HS and it is spot on![1.5]

4909251-May06_26.JPG (193 downloads)
Re: Differences between 1.5 and 1.6 rocker arms....... [Re: blownzoom440] #178279
12/29/08 08:28 PM
12/29/08 08:28 PM
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Quote:

i checked the actual lift on the HS and it is spot on![1.5]


Maybe my complaining did some good How old are yours?


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Differences between 1.5 and 1.6 rocker arms....... [Re: Cab_Burge] #178280
12/29/08 08:30 PM
12/29/08 08:30 PM

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Quote:

Check your current set for the accuracy, my 1.5 are actually 1.54 to 1.56, same on the new set of 1.6, (actually checked at the retainers 1.64 to 1.66) that I bought three years ago I use a ail indicator and set the lash at zereo, measure the actaul lift at the retainers and do the math, lobe lift times the ratio for theoritical lift versus actual lift at the retainers




just somethng to keep in mind, some of the better manufacturers take into account valvetrain deflection under operating condidtions. that's one part of the reason a 1.5 might be 1.54 and a 1.6 is 1.64, give or take a small amount.

Re: Differences between 1.5 and 1.6 rocker arms....... [Re: blownzoom440] #178281
12/29/08 08:31 PM
12/29/08 08:31 PM
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SKR8PN Offline OP
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I did the same as Metal Storm,but I cheated a weee bit by using another rocker shaft and cutting it down so you are only dealing with two rockers on a very short shaft.

Next question: What is the formula for determining the difference between a 1.5 and a 1.6 rocker arm NOT at full lobe lift? Lets say I want to calculate the difference in lift at 15 degrees ATDC? Do I measure ACTUAL lobe lift(on the lifter) at 15 degrees ATDC then X 1.6 and compare it to what I have actually measured with a 1.5 rocker arm at the retainer?????


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Re: Differences between 1.5 and 1.6 rocker arms....... [Re: SKR8PN] #178282
12/29/08 08:43 PM
12/29/08 08:43 PM
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what type of harlands are you looking for standards or offsets....


Mopar Performance
Re: Differences between 1.5 and 1.6 rocker arms....... [Re: Cab_Burge] #178283
12/29/08 09:17 PM
12/29/08 09:17 PM
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ELYRIA,OH
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Quote:

Quote:

i checked the actual lift on the HS and it is spot on![1.5]


Maybe my complaining did some good How old are yours?



thay are about 3yrs old.my other set went to the dont ask me how i know post about checking TQ specs on the hold downs.

4909430-Dec09_28.JPG (178 downloads)
Last edited by METAL STORM; 12/29/08 09:35 PM.
Re: Differences between 1.5 and 1.6 rocker arms....... [Re: SKR8PN] #178284
12/29/08 09:35 PM
12/29/08 09:35 PM
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Canton, Ohio
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Sport440 Offline
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Quote:

I did the same as Metal Storm,but I cheated a weee bit by using another rocker shaft and cutting it down so you are only dealing with two rockers on a very short shaft.

Next question: What is the formula for determining the difference between a 1.5 and a 1.6 rocker arm NOT at full lobe lift? Lets say I want to calculate the difference in lift at 15 degrees ATDC? Do I measure ACTUAL lobe lift(on the lifter) at 15 degrees ATDC then X 1.6 and compare it to what I have actually measured with a 1.5 rocker arm at the retainer?????




I just use the actual lobe lift and X again with the new ratio.
At the lower lobe lifts like at 15* BTDC or ATDC the extra .1 RR adds very little lift as compared to the higher lifts. mike

Re: Differences between 1.5 and 1.6 rocker arms....... [Re: moparniac] #178285
12/30/08 09:01 AM
12/30/08 09:01 AM
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SKR8PN Offline OP
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Quote:

what type of harlands are you looking for standards or offsets....





1.6 standards. They are going on a set of Stage VI MW heads.


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Re: Differences between 1.5 and 1.6 rocker arms....... [Re: SKR8PN] #178286
12/30/08 09:36 AM
12/30/08 09:36 AM
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Quote:

Quote:

what type of harlands are you looking for standards or offsets....





1.6 standards. They are going on a set of Stage VI MW heads.



MW Stage 6s require a .485" offset intake; std offset intakes won't work.

Re: Differences between 1.5 and 1.6 rocker arms....... [Re: BradH] #178287
12/30/08 09:50 AM
12/30/08 09:50 AM
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Akron, Ohio
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I'm trying to make a decision on this also. I have a 500" low deck with 440-1 heads and Indy 1.6 rockers.
I want to step up to Harland Sharp rockers but I'm debating on switching to 1.5's since the new cam is 706/661 lift with 1.5's. I'm worried 1.6's will give me too much lift for a street strip motor.


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Re: Differences between 1.5 and 1.6 rocker arms....... [Re: ProSport] #178288
12/30/08 01:28 PM
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My 518 with Eddy RPM heads loves the H.S. 1.6 rocker(actual 1.64 ratio) with a .420 lobe. The actual net lift at the retainers is around .710 to .730, love the differences bewtween rockers ratios on the same set As far as to much lift on a BB Mopar type head I don't think that you can get therte from here More lift is better if you want more power as long as you have a stable lobe and valve train that will handle it


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)






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