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Bassfreak0405
Dodge Dakota
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3/08/2005
17:31:08
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 Subject: Roller rockers?
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Message:
Hey everyone, I had a question. Are there any difference between the crower roller rockers for the 3.9 v-6 and the 5.2/5.9 v-8's? My buddy bought a set of 1.7's form truck performance.com for his 99 ram with the 5.2 but he doesnt want to put them on now since he might get rid of the truck. He would sell them to me for $225, would this be a possible swap out? ive read on here that the 3.9 is just a 5.2 with #1 and #8 cylinder hacked off but is the drivetrain the same?
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daddio
Dodge Dakota
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3/08/2005
18:40:52
| RE: Roller rockers?
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Message:
i am 99.99% sure they will work on your 3.9. i bought a set for mine over a year ago and have yet to install them. do it and let me know what i am missing!
oh, you could probably check with Crower cust serv to be 100% sure.
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stevebdak
Dodge Dakota
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3/08/2005
19:02:08
| RE: Roller rockers?
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Message:
Crower has different part numbers for the 3.9 and the 5.2 roller rockers. Here is what Huges Engines says are common swapable parts:
Some of the most obvious examples of interchangeability are the rocker arms, lifters, pushrods, timing chains, pistons, rings, valves, valve springs, retainers and in a slightly modified version the cylinder heads, camshafts, intake manifolds, throttle bodies and cold air intakes.
I run the 1.7 Crowers. At first I ran just the rockers. After bending a valve and blowing off the valve spring which damaged the rockerarm, I went with the longer crower pushrods and the guideplates. And after having my heads rebuilt, I am glad I went with the longer pushrods and guideplates.
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daddio
Dodge Dakota
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3/08/2005
19:06:25
| RE: Roller rockers?
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Message:
what happened steve? i understood that these crower 1.7's could run up to 5500 rpm with no probs. do you go over that?
just curious. i may want to sell mine instead of install them.
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Bassfreak0405
Dodge Dakota
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3/08/2005
19:12:38
| RE: Roller rockers?
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Message:
I think that the mounting studs are the same for both engines, 3/8". I think that i will try them out, hopefully everything will work out, though i'm not really looking forward to depening the baffles on the valve covers. But if the swap turns out ok, it should be worth the extra couple of ponies!!
thanks for the replys
John
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J and J Auto
GenII
3/09/2005
05:09:48
| RE: Roller rockers?
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Message:
The V6 and V8 both use the same crowers of corse
the number is diff one set has 12 and 1 16 daa
6 and 8 cyl
yes they will bolt right in just have 4 left over
Just lay the covers on a towel on the floor take
a short 2X4 and knock them down be sure to leave
the ends open 1/8 to 3/16 so the oil can be put in
the vent and pcv work
The top of the adjuster nut will hit if this is
not done takes about 5 min each to do
Larry
J&J Auto
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??????????
Dodge Dakota
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3/09/2005
11:16:41
| RE: Roller rockers?
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Message:
What about the Harland Sharp Rockers, would I want the adjustable or the non adjustable ones?
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stevebdak
Dodge Dakota
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3/09/2005
15:45:52
| RE: Roller rockers?
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Message:
Daddio, I was tached up at 4500 when it blew the spring off. I had about 20K on my rockers. It could have been a weak spring, or something else. either way I decided to add the longer pushrods and the guideplates. I have about 5K on the head rebuild and everything seams to be running fine. I don't think it had anything to do with the Crower rockers.
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daddio
Dodge Dakota
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3/09/2005
15:58:38
| RE: Roller rockers?
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Message:
thanks for replying steve. i still believe i am going to sell my set. i have another project that needs the money more. my '00 dak only has 45k on it and it does what i need it to do anyway. if you know anyone that wants them email me.
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Wadak
GenIII
3/10/2005
20:44:24
| RE: Roller rockers?
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Message:
Just to back up what Larry said, I followed his instuctions on my v6 Dak, I had no problem with the installation. I knocked the baffles in with a 2x4 and measured how down I knocked them in, about 3/8 of an inch. I pryed each end of the valve cover open slight with a small screw driver so that the PCV valve to work. I have about 23,000 miles on them without any problems. I have rev'ed it to the point it hit the limiter with no problems.
92 and 97 Daks both with many mods.
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chaz
Dodge Dakota
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8/09/2011
17:23:36
| RE: Roller rockers?
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Message:
hey john here do you still have the roller rockers? and how much would you take for them? for the 00 dakota? im running a 3.9
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daddio
Dodge Dakota
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8/09/2011
20:20:45
| RE: Roller rockers?
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Message:
That was over 6 years ago. they've been sold for quite a while.
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chaz
Dodge Dakota
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8/14/2011
16:25:34
| RE: Roller rockers?
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Message:
so on the roller rockers what do the 1.6 and 1.7 stand for?
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chaz
Dodge Dakota
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8/14/2011
20:43:30
| RE: Roller rockers?
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Message:
so on the roller rockers what do the 1.6 and 1.7 stand for?
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dakota49
Gen I
8/17/2011
22:43:02
| RE: Roller rockers?
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Message:
What those numbers mean is, for every .001 inch lift of the cam lobe, the rocker will open the valve .0016 inch, or .0017 inch 1.6-1.7.
The factory uses 1.5 rockers, so what happens is you wind up with more valve opening than with the stock rockers. That means the valve is opening more for more air and fuel to enter the cylinder, providing more POWER.
I hope that helps,
good luck
Dakota49
1988 3.9 5 speed 4X4
dakota49
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Todd93/96Dak
Dodge Dakota
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8/18/2011
09:12:47
| RE: Roller rockers?
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Message:
1.5 rockers were used on the LA series engines. The 1.6 rockers are in the Magnum series.
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harry from ct
Dodge Dakota
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8/22/2011
20:38:11
| RE: Roller rockers?
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Message:
had mine on 4 years tacked it out it new springs @6000 rpm
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Richard
Dodge Dakota
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5/18/2013
01:52:52
| RE: Roller rockers?
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Message:
the only way to get your pos dakota 3.9l 4x4 v6 to hit high 20's in the quarter would be to get really high and drop that sonna bitch down a f#cking mine shaft. no...its not fast...no that throttle body spacer didnt add 5 horses, aqnd no your cat back doesnt have a nice v8 growl. you know what has a nice v8 growl...a v8.
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Juicer
Dodge Dakota
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5/20/2013
17:30:21
| RE: Roller rockers?
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Message:
Hey wait a minute, I went from 175hp to 176hp with all those mods!
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