Thread: vvl valve shimming "how to"?

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2011-08-08 14:24:17

#11

cory

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I don't have the card in front of me but I think that's what they were ill rechecked them after work

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2011-08-08 14:46:09

#12

THOR

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Originally Posted by SR20GTi-R

Factory is .009 on the intake and .013 on the exhaust (+/- .002)

Is .020/.040 what kelford gave you Cory?

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2011-08-08 14:56:53

#13

SR20GTi-R

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Originally Posted by cory

I don't have the card in front of me but I think that's what they were ill rechecked them after work

Cool, just text me.

I have no idea where my card is.

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Tired..of the bullshit.

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2011-08-08 15:33:37

#14

THOR

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no texting.... put the info here....

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2011-08-08 16:58:31

#15

cory

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Originally Posted by ashtonsser

Step by step to make this as simple and painless as possible.

Install cam with all rockers and shims in place. Take initial measurements of all the clearances and write down on a sheet of paper with a drawing maybe to make it easier.

Whatever rockers are out of spec see just how much it is out of spec by taking your desired clearance and the clearance you got and subtract them, get your difference + or - dependant on if the clearance is too tight or too loose. Remove the shim and measure the shim one at a time for the ones that are out of spec. Then take your numbers + or - and you need a shim that much thicker or thinner to get the desired clearance. Install the proper thickness shim to get you within the desired spec.

It usually gives you a range so anywhere in that range is good. Specs can be found in the VE specs sticky in this section.

It just takes some time. Maybe one day we will get some aftermarket rocker arms that have an adjuster on it like the hondas. But i doubt it. haha For now we are stuck with reshimming.

I have to add for anyone doing this. Unlike written above you cannot get all your measurements with all shims in place. When your doing this you can only have one intake / or exhaust valve shimmed at a time; per cylinder. Since the rocker cannot twist side to side the only way to get an accurate measure is one shim at a time per rocker. ...

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2011-08-08 17:08:30

#16

Teal97

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yep. .20mm and .40mm
http://www.sr20-forum.com/west/47302-new-bumpsticks.html#post630514

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2011-08-08 17:42:44

#17

SR20GTi-R

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Originally Posted by Teal97

yep. .20mm and .40mm
http://www.sr20-forum.com/west/47302-new-bumpsticks.html#post630514

They list it in mm, so .20/.40mm is about .007/.014 in inches, which is what almost all of our feeler gauges are based on.

.009"in/.013"ex factory
.007"in/.014"ex Kelford

Seems like they went tighter on the intake and looser on the exhaust.

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Tired..of the bullshit.

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2011-08-08 17:59:54

#18

Mr.sentra_specv Online/offline status of Mr.sentra_specv is unknown

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.20mm = .0078"
.40mm = .0157"

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2011-08-08 18:16:11

#19

ashtonsser Online/offline status of ashtonsser is unknown

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Thanks Cory, Yeah i forgot to take into account the low lobes being conjoined not independant. If somehow you could get the feeler gauge between the bottom of the rocker and shim you should be able to take the measurement of both sides at once. I think a pair of some 90 deg feelers could get that done. You will have probably two different readings but the same thing applies. Just try to get the clearances as even as possible.

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2011-08-08 18:16:11

#20

SR20GTi-R

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Originally Posted by Mr.sentra_specv

.20mm = .0078"
.40mm = .0157"

Ok smart-ass its 8 & 16, you got me