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Gtir Motorsport club » Tech room » Help and Advice » Which shims do I need.??

Which shims do I need.??

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1 Which shims do I need.?? on 31st January 2015, 9:38 pm

Chrism


Going to order these from the land of oz
But anyone know the right measurements for them.???
http://www.precisionshims.com.au/products/sr20

Or will I have to measure mine fitst

2 Re: Which shims do I need.?? on 31st January 2015, 10:07 pm

nomad

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I think your have to measure each one first .... thats why there is some many different sizes mate ...


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3 Re: Which shims do I need.?? on 31st January 2015, 10:42 pm

gtir_woody

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Another question to add to this is how long after a head rebuild should the shims be checked etc.

4 Re: Which shims do I need.?? on 1st February 2015, 12:17 pm

Mr B

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gtir technician
gtir technician
You have measure current clearances then measure current shims & calculate new size needed to get clearance to spec you want.
You may find some of current shims might be re-usable in another location saving amount needing purchase.

On a fully rebuilt head I would recheck clearances within 800 miles just to be sure.

5 Re: Which shims do I need.?? on 1st February 2015, 2:33 pm

GTI-R US

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also if your re-shimming the head it will pay you in the long term to fit locator shims either side of the rocker arm instead of using just one.
this will keep the rocker in place and help avoid it throwing if you mis-shift or overly rev the engine


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6 Re: Which shims do I need.?? on 1st February 2015, 4:48 pm

Chrism


Will you look for me bob and I'll call thro the week and get some more info off you Smile

7 Re: Which shims do I need.?? on 2nd February 2015, 4:53 am

gtir_woody

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Mr B wrote:
On a fully rebuilt head I would recheck clearances within 800 miles just to be sure.

Thanks B, I'll need to add that to my list of things to do.

8 Re: Which shims do I need.?? on 2nd February 2015, 9:56 am

Mr B

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gtir technician
gtir technician
^ that's what I do & was general practice recommended through some engine builders & machinists & one I decided adopt.
If you had a lot of head work done such as valve seats, new cams etc it sure worth checking ...

9 Re: Which shims do I need.?? on 2nd February 2015, 10:38 am

gtir_woody

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Out of curiosity are they generally out by much/ or at all after that period of time? I'll still get everything checked over anyhow

10 Re: Which shims do I need.?? on 2nd February 2015, 11:01 am

Mr B

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gtir technician
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Generally very little change & still perfect setting range.
Have had one that went a little too low on clearance probably due to settling of new valves & seats.
for me it just peace of mind & extra safety check.

11 Re: Which shims do I need.?? on 2nd February 2015, 11:15 am

gtir_woody

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Very true, the last thing you wanna be saying is "wish I checked that" Laughing

12 Re: Which shims do I need.?? on 2nd February 2015, 5:08 pm

pulsarmoley

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Mine definitely sound like they need checking, this time I think ill be getting new valves and seats fitted.


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13 Re: Which shims do I need.?? on 1st March 2016, 10:52 pm

Cosmic73

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GTI-R US wrote:also if your re-shimming the head it will pay you in the long term to fit locator shims either side of the rocker arm instead of using just one.
this will keep the rocker in place and help avoid it throwing if you mis-shift or overly rev the engine

When you say locater shims, we're talking about the slotted shims right?

I'm about to order some from Australia soon so if anyone else wants some let me know and we can share postage?

Also i now 32 shims if anyone needs, their range is 2.39mm to 2.642mm tho,
Very Happy

14 Re: Which shims do I need.?? on 2nd March 2016, 7:58 am

Mr B

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gtir technician
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Cosmic73 wrote:
GTI-R US wrote:also if your re-shimming the head it will pay you in the long term to fit locator shims either side of the rocker arm instead of using just one.
this will keep the rocker in place and help avoid it throwing if you mis-shift or overly rev the engine

When you say locater shims, we're talking about the slotted shims right?

Yes that right .

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