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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Joined: Jan 2003
Posts: 8,028 The Grand State of Confusion-O...
SKR8PN
OP
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OP
master
Joined: Jan 2003
Posts: 8,028
The Grand State of Confusion-O...
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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.
Karma has no menu. You get served what you deserve.
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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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Joined: Aug 2003
Posts: 43,230 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,230
Bend,OR USA
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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)
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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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Anonymous
Unregistered
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Anonymous
Unregistered
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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.
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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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Joined: Jan 2003
Posts: 8,028 The Grand State of Confusion-O...
SKR8PN
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OP
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Joined: Jan 2003
Posts: 8,028
The Grand State of Confusion-O...
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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?????
Karma has no menu. You get served what you deserve.
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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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Joined: Jan 2003
Posts: 6,591 Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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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
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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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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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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.
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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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Joined: Jan 2003
Posts: 17,918 Akron, Ohio
ProSport
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,918
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.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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