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Thread: How to shim valves for sr20ve

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Posts: 11-20 of 24
2009-03-31 03:25:47
#11
Originally Posted by more_fasterer


- Also remember to check clearances on both low lobe & high lobe, and preferably optimise for the high lobe. In my experience with franklin cams, by optimising for the high lobe I found the low lobe was at the looser end of spec.


Interesting, how would you go about checking the lash for the high low when it is constantly in contact with the rocker pad, sort of like Honda's loss motion system?

I don't think the factory specify checking the clearance for the high lobe base on what I have seen from the FSM.
2009-03-31 05:30:19
#12
Originally Posted by more_fasterer
Please note when you're checking valve clearances on a VE:

- Two valves share the same rocker. Because of this, you need to measure the clearance on each valve independent of the other. This means you have to take the shim out of one valve (per pair) to check the clearance of the other.

- Also remember to check clearances on both low lobe & high lobe, and preferably optimise for the high lobe. In my experience with franklin cams, by optimising for the high lobe I found the low lobe was at the looser end of spec.

Because of these two points, and the need to remove the cam every time you want to add/remove/change shims, checking valve clearances on a VE takes bloody ages!!


Originally Posted by 5speed
Interesting, how would you go about checking the lash for the high low when it is constantly in contact with the rocker pad, sort of like Honda's loss motion system?

I don't think the factory specify checking the clearance for the high lobe base on what I have seen from the FSM.


LOL... can someone explain to me how to adjust the small lobe lash independent from the large lobe lash? lol
2009-03-31 05:37:59
#13
Originally Posted by snickers
LOL... can someone explain to me how to adjust the small lobe lash independent from the large lobe lash? lol


Saw?
2009-03-31 05:40:35
#14
Originally Posted by wnwright
Saw?


I know how to change the lash from the large and small lobes.... but it has nothign to do with the rocker arm...
2009-03-31 10:15:37
#15
Originally Posted by 5speed
Interesting, how would you go about checking the lash for the high low when it is constantly in contact with the rocker pad, sort of like Honda's loss motion system?


Typically with feeler gauges.
2009-03-31 16:50:13
#16
I will probably build a tool to push down one valve at a time that way I do not need to remove the cams. I would just push the valve down then grap the shim with a long magnet meanwhile the other spring will be holding the rocker arm up out of the way.

On second thought I dont know if I want to use harley shims. My car may suddenly break down or start leaking for some totaly unrelated reason.
2009-03-31 19:25:13
#17
Originally Posted by more_fasterer
Typically with feeler gauges.


Ok, I was hoping for more details.

Using a feeler gauge is a little basic for me.
2009-03-31 19:32:46
#18
Originally Posted by E's
I will probably build a tool to push down one valve at a time that way I do not need to remove the cams. I would just push the valve down then grap the shim with a long magnet meanwhile the other spring will be holding the rocker arm up out of the way.

On second thought I dont know if I want to use harley shims. My car may suddenly break down or start leaking for some totaly unrelated reason.


Very true

Don't worry about using using the V-rod shims. The V-rod is not a traditional(push rod air cooled) American engine. The engine was design by Porsche. That's why the shims are in metric. You're good to go.
2009-03-31 23:30:31
#19
What I do is engage the VVL "latch" (for want of a better term) with my finger, and then push down on the high lobe rocker with a large flathead screwdriver. With the right amount of downward pressure it'll hold the latch in against the spring.


Originally Posted by snickers
LOL... can someone explain to me how to adjust the small lobe lash independent from the large lobe lash?


I'd like to know too! In the post you quoted, I said how to check the clearances for the two lobes independently... adjustment is something else!
2009-04-01 03:47:39
#20
Well, your original post makes it sound like you could independently adjust the lash between the high lobe and low lobe. That why you went through the trouble of checking the middle lobe clearance.

As you have found out, you can't.

By opening up the clearance of the middle rocker with the high lobe, you will also open up the lash for the small lobes. They are tied together. The only way to adjust them independently is if you regrind the base circles, not something you could do with a feeler gauge.

Keep in mind, if you open up the clearance between the high lobe and the middle rocker, it will be harder on the valve train and results in a louder running engine.
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