 Not using the cylinder/head gasket..., ...and dropped valve seat? |
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| larss |
 Sep 29 2011, 07:48 AM
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#1
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Member  Group: Members Posts: 428 Joined: 10-September 09 From: Sweden Member No.: 10,787 Region Association: Scandinavia  |
If I don't fit any gasket at the top of the cylinders (which is what every expert suggests) will this affect the type/thickness of shim used at the bottom or is the increase in compression so marginal that standard shims can be used?
This is for a all standard 1,7 D-jet engine rebuild. /Lars |
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| hot_shoe914 |
Sep 29 2011, 07:55 AM
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on ramp passer Group: Members Posts: 3,802 Joined: 20-November 07 From: Earle, Ar. Member No.: 8,354 Region Association: None |
QUOTE(larss @ Sep 29 2011, 08:48 AM)  If I don't fit any gasket at the top of the cylinders (which is what every expert suggests) will this affect the type/thickness of shim used at the bottom or is the increase in compression so marginal that standard shims can be used? This is for a all standard 1,7 D-jet engine rebuild. /Lars You have to determine what compression ratio you want then you need to measure your deck height. |
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| larss |
Sep 29 2011, 08:17 AM
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#3
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Member Group: Members Posts: 428 Joined: 10-September 09 From: Sweden Member No.: 10,787 Region Association: Scandinavia |
/Lars
QUOTE You have to determine what compression ratio you want then you need to measure your deck height. Thanks guys, I will go for standard performance and aim for getting close to the standard compression ratio (within some margin). I dont know how thick the head gasket is and if removing it will be a noticeable increase? Someone may have done this calculation before for an all standard 1,7 80Hp engine ... QUOTE "Every expert suggests"? What, I'm no expert, despite my 38 years of T4 engine building? I use them and I've never had a problem. If you choose not to use them, plan on calculating the CR and shimming accordingly (we do that with the gaskets, because you need to do it)> You'll need a way to accurately measure the combustion chamber volume and a way to measure the piston deck height. The Cap'n Sorry Cap'n, I fully respect your opinion, havent noticed any different opinions on this until now (haven't read the treads carefully enough Im afraid). It has been written several times that VW/Porsche issued a service message about this but can not find the original posted anywhere... Anyhow, someone may already have done the combustion chamber measurements and calculation for a all standard 1,7 80Hp setup? /Lars S o |
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Posts in this topic
larss Not using the cylinder/head gasket... Sep 29 2011, 07:48 AM
Cap'n Krusty
/Lars
Thanks guys,
I will go for standard perfor... Sep 29 2011, 11:37 AM
76-914 Lars, have you planned your engine build? i.e. com... Sep 29 2011, 07:57 AM Cap'n Krusty
If I don't fit any gasket at the top of the c... Sep 29 2011, 07:59 AM nathansnathan The stock 1.7 head chamber is supposed to be aroun... Sep 29 2011, 10:50 AM Dave_Darling VW did issue a tech bulletin bout omitting the hea... Sep 29 2011, 11:07 AM larss Thanks guys, this made things clear to me!
Ju... Sep 29 2011, 11:31 AM |
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