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93 Dak
Dodge Dakota
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11/27/2004
21:43:11
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 Subject: Roller Rockers
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Message:
How about a quick lesson on RR's please.
Why do most of them need this adjusting process?
Is it relatively simple, just time consuming?
Anyone use the non-adjustable Harland Sharps?
Pro and cons with non-adjustable Harland Sharps?
Pros and con with adjustables?
Thanks,
James
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Mr. Teacher
Dodge Dakota
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11/28/2004
12:58:29
| RE: Roller Rockers
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Message:
heres your assignment. go here and do some research.
http://www.harlandsharp.com
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93 Dak
Dodge Dakota
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11/28/2004
13:35:08
| RE: Roller Rockers
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Mr. Teacher
Did that already. Maybe there's a secret link somewhere on their web site you can share with me since you think you answered my questions :)
Thanks so much!
James
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.boB
Dodge Dakota
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11/30/2004
00:58:25
| RE: Roller Rockers
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Message:
Rocker arms in general:
Factory assembly uses non adjustable because they are cheaper and easier, not because they are better.
Aftermarket installations should always be adjustable, IMO. You need to compensate for variabilities in aftermarket parts, and for wear.
Adjustment is pretty simple on hydraulic valve trains. It takes a little time, but it's not difficult. Do it once and forget it.
Roller rockers: There is no performance advantage in a street motor! The advantage of a roller is that parts roll on needle bearings instead of sliding metal against metal. That friction creates heat, and causes parasitic power consumption. But it's a very small amount, usually not even measurable at street rpm's (<3,500).
If you're looking for more power, you don't need a roller tip. What you do need is an increased ratio, like from 1.6 to 1.7. A little more valve lift will give you a little more power at the upper ranges. Unfortunatly, I'v not seen a stock type replacement available with a better ratio, so you're kind of stuck spending the big bux on rollers.
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carmen
Dodge Dakota
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12/01/2004
22:34:51
| RE: Roller Rockers
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Message:
harland sharp factory replacement non adjustable roller rockers with 1.7 ratio, great investment.
easy as putting in factory parts.
I bought mine from sam, http://www.socaldakota.com/
great guy, good price.
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93 Dak
Dodge Dakota
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12/01/2004
22:44:13
| RE: Roller Rockers
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My heads will be milled and block decked so I assume adjustables would better suit me, correct?
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.boB
Dodge Dakota
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12/01/2004
22:54:23
| RE: Roller Rockers
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Message:
Yes, and no. You need to make an adjustment in your push rods to compensate for the machine work. The rockers are now closer to the cam shaft. If you don't mill too much you can use the stock push rods. You'll need to check for proper valve train geometry during assembly.
I would start by using an adjustable rocker arm. Then, if needed, you can get the correct length push rods.
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