 1.7 L piston compression ratio/tops W-series 1970engine, Dome vs flat-top ? |
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914/4: 70 71 72 73 74 75 76 914/6: 70 71 72
| pgollender |
 Apr 6 2017, 08:10 AM
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Member  Group: Members Posts: 193 Joined: 5-July 11 From: Sacramento Member No.: 13,281 Region Association: Northern California  |
I have taken apart two 1970 W series motors and both had dome-top style pistons. Is the dome top still available as "new" or are all that are left are flat ones ?
I think the domes were rated at 8.2:1 compression ratio. The flat ones that I've seen are rated slightly less. If the original pistons themselves are in good shape what would you do ? Re-ring them or buy new flat stock with less compression ? Where are members gone for new cylinders ? Surely those old oxidized ones can't dissipate heat that effectively. |
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| 914Sixer |
Apr 7 2017, 02:24 PM
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914 Guru Group: Members Posts: 8,882 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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All 1.7 Porsche had domed pistons and were 8:2:1. Flat top pistons where in the VW bus and VW 411. Do not know what is offered now. Every now and then a set of the OEM domed pistons show up for sale on Ebay or theSamba.com.
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Posts in this topic
pgollender 1.7 L piston compression ratio/tops W-series 1970engine Apr 6 2017, 08:10 AM
PancakePorsche If they are within wear limit and no scuffing, do ... Apr 9 2017, 01:22 AM |
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