 Help on deck height |
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| Shindog1961 |
 Apr 13 2014, 07:53 PM
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#1
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Member  Group: Members Posts: 196 Joined: 10-November 12 From: Santa Fe New Mexico Member No.: 15,133 Region Association: Southwest Region  |
Put my first cylinder and piston on and the deck height looks really low. Measures out to .2mm. That's got to be too low! Right? Thoughts?
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| Michael RD |
Apr 13 2014, 09:11 PM
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#2
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Newbie Group: Members Posts: 34 Joined: 7-March 13 Member No.: 15,628 Region Association: None |
Yes too low. General consensus is min. .035 to .040 (1mm). Thicker cyl. base shims required. (IMG:style_emoticons/default/bye1.gif)
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| malcolm2 |
Apr 14 2014, 06:59 AM
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#3
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Advanced Member Group: Members Posts: 2,738 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States 
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Seems to me your question should have included your compression ratio goal and actual with no shims vs a question about just the height. There is alot more to it than just the height. Use this link to get the CR result you want. You can work backwards to get the total thickness of shims and resulting height.
https://www.cbperformance.com/v/enginecalc.html There are other calculators out there just google it. Clark |
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| VaccaRabite |
Apr 14 2014, 08:00 AM
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#4
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En Garde! Group: Admin Posts: 13,417 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
Exactly.
What compression ratio are you targeting? |
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| Shindog1961 |
Apr 20 2014, 04:18 PM
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#5
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Member Group: Members Posts: 196 Joined: 10-November 12 From: Santa Fe New Mexico Member No.: 15,133 Region Association: Southwest Region |
Going for stock 8.2. Trying to keep the cost down, its mostly a learning experience. Domed pistons are above the cylinders with no shims, peripheral clearance .65 mm. Heads are stock heads, no machining just cleaned up new springs and valves.
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| Woody |
Apr 20 2014, 04:38 PM
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#6
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Sandbox Rabblerouser and head toilet scrubber Group: Members Posts: 3,858 Joined: 28-December 10 From: San Antonio Texas Member No.: 12,530 Region Association: Southwest Region |
Domed pistons?
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| rick 918-S |
Apr 20 2014, 06:37 PM
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#7
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Hey nice rack! -Celette Group: Members Posts: 20,402 Joined: 30-December 02 From: Now in Superior WI Member No.: 43 Region Association: Northstar Region 
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Are you building a 1.7? Domed? I have seen domed 1.7 pistons but not 2.0. Of course I can say I have not seen everything.
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| wndsrfr |
Apr 20 2014, 06:39 PM
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#8
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Senior Member Group: Members Posts: 1,428 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region
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QUOTE(Shindog1961 @ Apr 13 2014, 05:53 PM)  Put my first cylinder and piston on and the deck height looks really low. Measures out to .2mm. That's got to be too low! Right? Thoughts? Is there a step cut in the head.....that has to be taken into account.... |
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| malcolm2 |
Apr 20 2014, 06:59 PM
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#9
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Advanced Member Group: Members Posts: 2,738 Joined: 31-May 11 From: Nashville Member No.: 13,139 Region Association: South East States
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QUOTE(wndsrfr @ Apr 20 2014, 07:39 PM) Is there a step cut in the head.....that has to be taken into account.... Show us some pictures. (IMG:style_emoticons/default/thisthreadisworthlesswithoutpics.gif) |
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| Shindog1961 |
Apr 21 2014, 12:29 PM
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#10
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Member Group: Members Posts: 196 Joined: 10-November 12 From: Santa Fe New Mexico Member No.: 15,133 Region Association: Southwest Region |
Thanks everyone for their input. Greg at Fat Performance got me set up with new shims for the proper height.
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| 76-914 |
Apr 21 2014, 03:11 PM
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#11
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,482 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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Did you CC your heads, yet? It's simple and you'll need that info to go forth? I've got a home made set up I'll loan you for the cost of shipping if you need one.
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