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Location:
Adelaide
Registered:
June 2002
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Re: compression...how low is to low (boosted engine)
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Sat, 05 March 2005 11:57
 
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Yeah-I concur, 8.5 should be fine-any lower and she'll be a tad sluggish off boost. My 5M psycho motor was around 7.5, and off boost it was a tad casual.
If you are going to the CHG setup, make sure the builder pays really good attention to the head and block prep. Try to get the head surface almost mirror smooth, as well as the finish on the block. A really fresh cutter on the machine and slowing the feed right up is a good way to start, followed by an absolutely flat aluminium section and superfine wet&dry paper (and elbow grease...). This reduces the small passages for gas to get between the CHG and head and block, and also improves the sealing of water/oil galleries. You don't have to o-ring it, but it will make it even stronger. Head studs are also a VERY good investment as you can really give the setup a definite crush, instead of just stretching the stock head bolts...Careful prep can ensure set-and-forget-it, the alternative being ongoing headaches with a CHG..
And someone mentioned 3Bond-brilliant stuff.
A really good bloke to call and get advice from about prepping is the bloke at Copper Head Gaskets here in Adelaide (Somerton Park).
Anyway-take it easy
Sean
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| | Subject | Poster | Date |
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compression...how low is to low (boosted engine)
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people100 | Wed, 02 March 2005 10:49 |
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Re: compression...how low is to low (boosted engine)
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4agte | Wed, 02 March 2005 10:53 |
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Re: compression...how low is to low (boosted engine)
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people100 | Wed, 02 March 2005 11:18 |
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Re: compression...how low is to low (boosted engine)
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4agte | Wed, 02 March 2005 11:37 |
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Re: compression...how low is to low (boosted engine)
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thechuckster | Wed, 02 March 2005 12:43 |
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Re: compression...how low is to low (boosted engine)
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4agte | Thu, 03 March 2005 08:14 |
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Re: compression...how low is to low (boosted engine)
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thechuckster | Fri, 04 March 2005 06:31 |
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Re: compression...how low is to low (boosted engine)
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4agte | Fri, 04 March 2005 07:16 |
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Re: compression...how low is to low (boosted engine)
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Cool1 | Wed, 02 March 2005 12:48 |
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Re: compression...how low is to low (boosted engine)
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people100 | Thu, 03 March 2005 07:41 |
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Re: compression...how low is to low (boosted engine)
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Norbie | Thu, 03 March 2005 11:21 |
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Re: compression...how low is to low (boosted engine)
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THE WITZL | Thu, 03 March 2005 23:24 |
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Re: compression...how low is to low (boosted engine)
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Mr DOHC | Fri, 04 March 2005 06:22 |
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Re: compression...how low is to low (boosted engine)
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oldcorollas | Fri, 04 March 2005 07:39 |
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Re: compression...how low is to low (boosted engine)
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YelloRolla | Fri, 04 March 2005 08:51 |
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Re: compression...how low is to low (boosted engine)
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people100 | Fri, 04 March 2005 09:48 |
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Re: compression...how low is to low (boosted engine)
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sideshow | Fri, 04 March 2005 11:43 |
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Re: compression...how low is to low (boosted engine)
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Norbie | Fri, 04 March 2005 15:19 |
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Re: compression...how low is to low (boosted engine)
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fatmr2 | Fri, 04 March 2005 21:15 |
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Re: compression...how low is to low (boosted engine)
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4agte | Sun, 06 March 2005 08:12 |
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Re: compression...how low is to low (boosted engine)
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Steve M | Sat, 05 March 2005 00:08 |
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Re: compression...how low is to low (boosted engine)
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people100 | Sat, 05 March 2005 11:09 |
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Re: compression...how low is to low (boosted engine)
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people100 | Sat, 05 March 2005 12:06 |
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Re: compression...how low is to low (boosted engine)
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MS-75 | Sat, 05 March 2005 11:57 |
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Re: compression...how low is to low (boosted engine)
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YelloRolla | Sun, 06 March 2005 06:54 |
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Re: compression...how low is to low (boosted engine)
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people100 | Sun, 06 March 2005 09:44 |
