 stock 2.0 914-6 compression values |
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| Todd230 |
 Feb 18 2013, 06:45 PM
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#1
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Newbie  Group: Members Posts: 10 Joined: 3-February 13 From: Phoenix Member No.: 15,475 Region Association: None  |
Just picked up a 914-6 this weekend which is in need of some reassembly. Compression values are currently in the 145 psi range. A local mechanic told me the typical values for a stock motor would be in the 125-130 range because of the low compression set up in 1970. I'd be interested in the values other members are seeing with their stock 2.0 vs a stock motor with a slight bump in compression via S pistons (for example). This is just out of curiosity, while I'm working to get the fuel and brake systems in shape. Pure speculation. Any input would be great - thank you. Todd
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| sixnotfour |
Feb 18 2013, 06:51 PM
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#2
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914 Wizard Group: Members Posts: 10,432 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains 
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No Pics ....No answers ......NoOby rules
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| JmuRiz |
Feb 18 2013, 07:15 PM
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#3
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914 Guru Group: Members Posts: 5,427 Joined: 30-December 02 From: NoVA Member No.: 50 Region Association: MidAtlantic Region
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I think the numbers vary on the machine used to check...maybe an experienced engine builder would know ballpark values.
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| Todd230 |
Feb 18 2013, 08:21 PM
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#4
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Newbie Group: Members Posts: 10 Joined: 3-February 13 From: Phoenix Member No.: 15,475 Region Association: None |
on the way home Saturday -
(IMG:http://www.914world.com/bbs2/uploads_offsite/farm9.staticflickr.com-15475-1361240476.1.jpg) photo by todd2302000, on Flickr My old car - (IMG:http://www.914world.com/bbs2/uploads_offsite/farm9.staticflickr.com-15475-1361240477.2.jpg) image by todd2302000, on Flickr |
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| Todd230 |
Feb 18 2013, 08:22 PM
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#5
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Newbie Group: Members Posts: 10 Joined: 3-February 13 From: Phoenix Member No.: 15,475 Region Association: None |
Was just curious. When I was building kart engines compression between the different spec motors were pretty easy to distinguish.
Pretty nice little car. 99% rust free - there is a 50 cent size hole right behind the passenger front tire on the rocker, hell hole is rust free, pan looks solid. Need to install the rebuilt calipers, ss fuel lines, rebuilt webers, and see where I am in terms of leaks, compression again, leak down and go from there. Considering putting another motor in it just to have the experience of building a porsche motor at my own pace while driving this one and then swapping it out so I can drive it a little more spirited. It's got an old respray one it and its got a few dents and dings but nothing major. Going to run a paint thickness gauge over it just for info - I don't see any major bodywork in it. Think it was a simple respray based on the masking lines, etc.. Estimate it's been sitting for 10 - 20 years. Original paperwork, delivery booklet with VIN and motor #s, etc.. |
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| Cairo94507 |
Feb 18 2013, 09:01 PM
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#6
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Michael Group: Members Posts: 9,762 Joined: 1-November 08 From: Auburn, CA Member No.: 9,712 Region Association: Northern California
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Very nice car. Congratulations.
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| Mike Bellis |
Feb 18 2013, 09:12 PM
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#7
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None
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The actual number is less important then consistency between the cylinders.
Actual numbers will vary from tool to tool... |
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| Todd230 |
Feb 18 2013, 09:17 PM
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#8
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Newbie Group: Members Posts: 10 Joined: 3-February 13 From: Phoenix Member No.: 15,475 Region Association: None |
Thanks. Yes I understand the basics of compression testing. My question was geared towards what combinations produce x compression values. My 3.2 carrera motor produced 175 psi, 3.0 with a certain piston an combustion chamber might produce x compression, etc. I'm just curious if someone slipped s pistons in this 2.0 since the compression was a bit higher than expected.
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| sixnotfour |
Feb 18 2013, 09:37 PM
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#9
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914 Wizard Group: Members Posts: 10,432 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains
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Iron fins for T, Aluminum fins for E or S,,On the cylinders, view rom below.
Great looking 914-6 (IMG:style_emoticons/default/welcome.png) |
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| Todd230 |
Feb 18 2013, 09:59 PM
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#10
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Newbie Group: Members Posts: 10 Joined: 3-February 13 From: Phoenix Member No.: 15,475 Region Association: None |
Great! Thank you. I have iron cylinders.
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| brant |
Feb 19 2013, 07:56 AM
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#11
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914 Wizard Group: Members Posts: 11,624 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains
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you've already got it figured out...
but also remember compression numbers vary depending on what altitude the car is residing at during the test. |
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