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ddgonzal
Re: Building mild daily engine
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H89 is same compression ratio as stock A12 head, so don't waste your time there.

H89: 29-31cc
A12: 27-29cc

However, H89 makes superior power above 3000 RPM. It is highly recommended unless you don't like to rev the engine in daily use.

Yes, flat-top pistons are the best way to gain higher compression.

To make the most HP, don't worry about Compression Ratio, but instead fit larger pistons. Regular oversize pistons (0.5 mm) will gain no noticable power. A14 pistons are 3mm larger diameter, and will deliver far more power than Compression Ratio change.

Otherwise, simply put new rings in the A12 and enjoy. Most blocks do not require any machining of bores unless you are fitting larger pistons.

Posted on: 2012/7/30 18:47
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Subject Poster Date
     Building mild daily engine zakdat 2012/7/30 4:38
       Re: Building mild daily engine Stock1200Ute1 2012/7/30 4:56
       Re: Building mild daily engine zakdat 2012/7/30 11:48
         Re: Building mild daily engine bakat 2012/7/30 12:04
           Re: Building mild daily engine zakdat 2012/7/30 12:19
       Re: Building mild daily engine Stock1200Ute1 2012/7/30 13:26
         Re: Building mild daily engine ddgonzal 2012/7/30 18:47
           Re: Building mild daily engine Stock1200Ute1 2012/7/31 0:58
             Re: Building mild daily engine Rallytwit 2012/7/31 2:24
               Re: Building mild daily engine Stock1200Ute1 2012/7/31 2:54
                 Re: Building mild daily engine zakdat 2012/7/31 4:34
                   Re: Building mild daily engine Stock1200Ute1 2012/7/31 9:16
       Re: Building mild daily engine bige 2012/7/31 9:48
       Re: Building mild daily engine zakdat 2012/7/31 12:34
         Re: Building mild daily engine estyre 2012/7/31 14:55
           Re: Building mild daily engine ddgonzal 2012/7/31 18:20
             Re: Building mild daily engine zakdat 2012/7/31 21:46
               Re: Building mild daily engine Stock1200Ute1 2012/7/31 23:59
                 Re: Building mild daily engine Stock1200Ute1 2012/8/1 0:14
                   Re: Building mild daily engine zakdat 2012/8/1 0:39
                   Re: Building mild daily engine Stock1200Ute1 2012/8/1 0:46
       Re: Building mild daily engine zakdat 2012/8/1 0:52
         Re: Building mild daily engine Stock1200Ute1 2012/8/1 1:23
       Re: Building mild daily engine BeeJJ 2012/8/2 12:42
         Re: Building mild daily engine Stock1200Ute1 2012/8/2 13:21
         Re: Building mild daily engine BeeJJ 2012/8/2 14:14
           Re: Building mild daily engine Stock1200Ute1 2012/8/2 14:24
             Re: Building mild daily engine Stock1200Ute1 2012/8/2 14:29
       Re: Building mild daily engine BeeJJ 2012/8/2 23:07
         Re: Building mild daily engine Stock1200Ute1 2012/8/3 0:04
           Re: Building mild daily engine Anonymous 2012/8/3 0:31
             Re: Building mild daily engine Stock1200Ute1 2012/8/3 4:40
               Re: Building mild daily engine davem69 2012/8/16 8:34
       Re: Building mild daily engine zordmaker 2012/8/17 12:47
       Re: Building mild daily engine slowdat 2012/8/20 4:20




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