I'm running a Hydraulic roller cam with 1.6 ratio roller rockers. They have poly locks and we are having a bit of trouble installing them.

Not sure if the rocker arm stud is too high, or I just havn't tightened the nuts enough. What is the proper installation procedure for these type of rocker arms.

 

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Back the allen screw out quite a bit. Turn the nut with your fingers until the pushrod is difficult to turn, then use a closed end wrench (not a socket) turn the nut 1/2 turn more.

Next step is critical.

Hold the nut with a box end wrench so it DOES NOT MOVE, then use an allen wrench to tighten the allen screw. This holds the nut in place. It's the ONLY thing that holds the nut in place so don't be affraid to tighten it.

They make tools for those things that work pretty well.

http://www.jegs.com/cgi-bin/ncommerc...12&prmenbr=361

 

I just noticed two things.

First ........ does that rocker arm clear the retainer on the spring? It looks VERY close.

Second...... The nose of the rocker looks like it's riding on the very far edge (away from the stud) of the valve tip. Have you checked that you have the right length pushrods?

Actually there are three things.

Where are the guide plates? Or are you just relying on the pushrod holes in the head to keep the rockers inline with the valves? From what I can tell, those aren't self aligning rockers, are they?

 

1. Yes it does the rocker arms are machined on the inside, there is alot more clearance than the picture makes it looks like.

2. I have standard length pushrods Comp Cams HP-5000R is says on them

3. No guideplates, I recieved conflicting info on whether I should get them or not, so I didn't, I may need them.


The rocker arm geometry seems off, the biggest question is the stud length. Standard 1.76 was too short these are 1.9 but they have ridge on the thread and will not go flush with head.

Edit - I think the ridge is the spacer for guide plates. Do I need to run this with guide plates?

This is my first engine and at this point I am really bewildered.

 

yea dude with non aligning rckers u need them, thats why they make them.

with aligning rockers the roller tip is inside the body of the rocker so to speak...the tips fit over the valve stem so the rocker doesnt move side to side

non-aligning rockers dont have the tip sunkin in..so without guide plates the rocker COULD mover around, become loose from the stud and will cause real problems in that cylinder

good luck!

 

First and foremost.... Have the heads opened up where the pushrods go through and run guide plates or you'll more likely than not have a noisy engine that will make you chase a lifter noise for days. I am running earlier heads on my car. 1.6 roller rockers.. My machinist assured me that the guide holes in the heads would be fine. Yea right...

The ideal geometry would put the center of the rocker to the intake side of the valve stem and then true center at half cam lift. Geometry is mostly set with the pushrod. A pushrod length checker is available from summit.

Here is what comp cams has to say....

http://www.compcams.com/information/Products/Pushrods/

 

So, if the roller tip is to far outboard (away from the stud) then do I need a longer or a shorter push rod?

 

i agree the rocker tip looks like it's too far forward. have you chacked push rod length?

 

Make sure you Install guide plates when dialing in the trajectory. Get the heads opened up for plenty of clearance and add guide plates. I can't even begin to tell you how much trouble that could save you. Your making a change that it won't like with the 1.6 roller rockers. ans easy way to tell would be to grab a rocker at tdc and move it from side to side. If any of them go into bind before it can find center you have to deal with it. Most likly the rear two cylinder intakes will not center up.

Bring it up to TDC on a cylinder, put some assy lube or something on it and adjust the valve. then remove the rocker and see how close to center the roller moves up on the stem.


A shorter push rod will bring it closer towards the intake. Just pull off a rocker and take out the push rod and slip the rocker back on. That will give you an idea of what your up against.