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914World.com _ 914World Garage _ stock 2.0 914-6 compression values

Posted by: Todd230 Feb 18 2013, 06:45 PM

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

Posted by: sixnotfour Feb 18 2013, 06:51 PM

No Pics ....No answers ......NoOby rules

Posted by: JmuRiz Feb 18 2013, 07:15 PM

I think the numbers vary on the machine used to check...maybe an experienced engine builder would know ballpark values.

Posted by: Todd230 Feb 18 2013, 08:21 PM

on the way home Saturday -
http://www.flickr.com/photos/81912396@N00/8486951105/
http://www.flickr.com/photos/81912396@N00/8486951105/ by http://www.flickr.com/people/81912396@N00/, on Flickr

My old car -
http://www.flickr.com/photos/81912396@N00/8379409354/
http://www.flickr.com/photos/81912396@N00/8379409354/ by http://www.flickr.com/people/81912396@N00/, on Flickr

Posted by: Todd230 Feb 18 2013, 08:22 PM

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..

Posted by: Cairo94507 Feb 18 2013, 09:01 PM

Very nice car. Congratulations.

Posted by: kg6dxn Feb 18 2013, 09:12 PM

The actual number is less important then consistency between the cylinders.

Actual numbers will vary from tool to tool...

Posted by: Todd230 Feb 18 2013, 09:17 PM

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.

Posted by: sixnotfour Feb 18 2013, 09:37 PM

Iron fins for T, Aluminum fins for E or S,,On the cylinders, view rom below.
Great looking 914-6

Posted by: Todd230 Feb 18 2013, 09:59 PM

Great! Thank you. I have iron cylinders.

Posted by: brant Feb 19 2013, 07:56 AM

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.