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Author Topic: what is a 'reasonable' deck height  (Read 3221 times)
nicolas
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Posts: 4010
« on: November 13, 2010, 15:26:10 pm »
i want to know what is a good or accepted as reasonable deck height in an engine?

my engine spec is 82x94. heads are 58cc and have a step in them. and without shims i have a deckheight of 0.52mm now. so with a shim tha measures 1mm (or a 0.040) i would end up with my desired CR of 9 to 9.4

is this OK or do i need more? can i get away with less?
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Peter
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Posts: 1301
« Reply #1 on: November 13, 2010, 17:09:30 pm »
with good parts 0.040 should be OK,
thats what i wanted to do when i still wanted to keep my engine NA
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Jo Clifford
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Posts: 577



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« Reply #2 on: November 13, 2010, 18:10:41 pm »
Quote from: nicolas on November 13, 2010, 15:26:10 pm
i want to know what is a good or accepted as reasonable deck height in an engine?

my engine spec is 82x94. heads are 58cc and have a step in them. and without shims i have a deckheight of 0.52mm now. so with a shim tha measures 1mm (or a 0.040) i would end up with my desired CR of 9 to 9.4

is this OK or do i need more? can i get away with less?

Yes,that is ok Smiley

Jo
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nicolas
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Posts: 4010
« Reply #3 on: November 14, 2010, 18:35:07 pm »
Quote from: Peter on November 13, 2010, 17:09:30 pm
with good parts 0.040 should be OK,
thats what i wanted to do when i still wanted to keep my engine NA

Quote from: Jo Clifford on November 13, 2010, 18:10:41 pm
Quote from: nicolas on November 13, 2010, 15:26:10 pm
i want to know what is a good or accepted as reasonable deck height in an engine?

my engine spec is 82x94. heads are 58cc and have a step in them. and without shims i have a deckheight of 0.52mm now. so with a shim tha measures 1mm (or a 0.040) i would end up with my desired CR of 9 to 9.4

is this OK or do i need more? can i get away with less?

Yes,that is ok Smiley

Jo

thanks honeys  Wink
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Jesse/DVK
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'64 2176cc


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« Reply #4 on: November 15, 2010, 20:35:10 pm »
Rule of thumb is minimum 1mm but max 1.5mm to get enough squish.

How much is the step? You should add that to to your deck height.
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Der Vollgas Kreuzers
nicolas
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Posts: 4010
« Reply #5 on: November 16, 2010, 11:39:01 am »
Quote from: Jesse/DVK on November 15, 2010, 20:35:10 pm
Rule of thumb is minimum 1mm but max 1.5mm to get enough squish.

How much is the step? You should add that to to your deck height.

not sure if i can add the step to my deckheight. i don't want the piston hitting the step or so. i prefer to keep my pistons IN the cylinders for now.  Wink but i do understand what you are saying.
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