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Author Topic: Rocker shims  (Read 4800 times)
Eddie DVK
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« on: June 03, 2019, 11:50:13 am »
Is there a limit on how much you can put between the head and the rockers.
I now have a 1.5 mm between them ( the thickest set you can buy) but need a bit more...
Did some of you combine several thicknesses under the rocker...

Thanks in advance.
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Regards Edgar

" Type 4, it is a completely different engine. You have to drive one to understand! "
richie
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« Reply #1 on: June 03, 2019, 17:42:44 pm »
I have just finished one that needed 3 x 0.030thou  under each block so 0.090 total[ nearly 2.3mm] I had to move rocker stud out of head a little to make sure shoulder that rocker block locates on had enough out of shims to work as intended but that was all.

cheers Richie
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Cars are supposed to be driven, not just talked about!!!   


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richie
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« Reply #2 on: June 03, 2019, 18:24:38 pm »
Oh and also you might need taller valve covers  Roll Eyes
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Cars are supposed to be driven, not just talked about!!!   


Good parts might be expensive but good advice is priceless Wink
Eddie DVK
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« Reply #3 on: June 03, 2019, 20:53:17 pm »
Thank you Richie.

Hm the taller valve covers I forgot...
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Regards Edgar

" Type 4, it is a completely different engine. You have to drive one to understand! "
nicolas
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« Reply #4 on: June 05, 2019, 08:47:08 am »
Quote from: richie on June 03, 2019, 18:24:38 pm
Oh and also you might need taller valve covers  Roll Eyes

dipples also do the trick.  Roll Eyes

with thicker shims make sure to check the covers as you easily have not enough space...
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Martin S.
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« Reply #5 on: June 06, 2019, 01:39:14 am »
Is this caused by longer installed valve stem height?
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Cal Look white 68 Bug with AJ Sims EFI Turbo 2332. 194hp 240tq @ 5500 rpm 3psi boost.
Eddie DVK
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« Reply #6 on: June 06, 2019, 06:53:38 am »
Quote from: Martin S. on June 06, 2019, 01:39:14 am
Is this caused by longer installed valve stem height?

Ooooh sorry martin,

No this was caused by installing Porsche swivelfeet adjusters.
In an engine that was already in use... and did not want to modify the pushrod length.
« Last Edit: June 06, 2019, 07:58:04 am by Eddie » Logged
Regards Edgar

" Type 4, it is a completely different engine. You have to drive one to understand! "
alex d
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« Reply #7 on: June 06, 2019, 09:40:43 am »
did you grind around 1mm from the underside of the rockers to make space? with 911 adjusters everything gets tight if you don't
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Eddie DVK
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« Reply #8 on: June 06, 2019, 10:19:39 am »
Quote from: alex d on June 06, 2019, 09:40:43 am
did you grind around 1mm from the underside of the rockers to make space? with 911 adjusters everything gets tight if you don't

Yep I did, even chamfer the underside a bit to make room for the swivelfeet to rotate/move.
Will post a picture tonight.

Have everything fitted and by chamfering a bit more, I have now enough space on the swivels..
Only thing to test is the valve cover now.
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Regards Edgar

" Type 4, it is a completely different engine. You have to drive one to understand! "
Dougy Dee
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« Reply #9 on: June 06, 2019, 13:30:14 pm »
So... why did you add the swivel feet adjusters?
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Eddie DVK
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« Reply #10 on: June 07, 2019, 10:50:43 am »
Quote from: Dougy Dee on June 06, 2019, 13:30:14 pm
So... why did you add the swivel feet adjusters?


Always straight contact to the valve, does not need a perfect valve geometry to work properly, so easier to set up.
Porsche uses them.... although that can not be the reason to use them.. Grin
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Regards Edgar

" Type 4, it is a completely different engine. You have to drive one to understand! "
Martin S.
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« Reply #11 on: June 07, 2019, 12:23:43 pm »
I have an extra NOS Berg set for sale if anyone’s interested. Beef ones don’t need clearance grinding of the rockers.
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Cal Look white 68 Bug with AJ Sims EFI Turbo 2332. 194hp 240tq @ 5500 rpm 3psi boost.
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