2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

lowering compression possible for N/A's?

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Old Feb 2, 2005 | 12:02 AM
  #1  
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lowering compression possible for N/A's?

just wonder if is possible to lower the comp. on an n/a so it could handle turbo better???
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Old Feb 2, 2005 | 12:14 AM
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turbo rotors...i cant think of any other way safely...but you might wanna see if any one else has any ideas.
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Old Feb 2, 2005 | 12:15 AM
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The only way to do it is to take the engine apart and replace the rotors with lower compression rotors from a Turbo II. The '87-'88 T-II's had 8.5:1 compression. The '89-'91 T-II's had 9.0:1 compression.
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Old Feb 2, 2005 | 12:33 AM
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If you can find someone to machine it for you, it can be done. But yea the easiest way is to get a pair of used TII rotors.
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Old Feb 2, 2005 | 12:12 PM
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ok thnx guys =)
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Old Feb 2, 2005 | 12:31 PM
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nm
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Old Feb 2, 2005 | 03:12 PM
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But why would you want to? Once you've gone high-compression-turbo, you'll never go back.
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Old Feb 2, 2005 | 04:25 PM
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yea, why would you want to? high compression will produce a lot more power.
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Old Feb 2, 2005 | 04:53 PM
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how detremental would it be if i were to rebuild my 89n/a engine and turbo charged it?
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Old Feb 2, 2005 | 05:01 PM
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Just drive it lots!!! After about 100k the compression will be much lower

-OR-

Take the exhaust off and using a long drill bit, drill out the rotors via the exhaust ports. Adding the holes in the cavity of the Rotor will lower the compression.

If you listen to me......well your dumber than I sound
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Old Feb 2, 2005 | 05:05 PM
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wont turboing a high compression rotary increase the likelyhood of detonation if it isnt tuned to the utmost precision?
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Old Feb 2, 2005 | 05:12 PM
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From: N/A
Originally Posted by IaMtHeRuThLeSs1
wont turboing a high compression rotary increase the likelyhood of detonation if it isnt tuned to the utmost precision?
If its not tuned correctly, yes. Ya can make more power with less boost with higher-compression rotors.
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