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Smarty
PostPosted: Tue Oct 23, 2007 5:18 pm 
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Thought comments and debate open for discussion.

What do you think?

Which head for an SC12'ed 1275?

Running RE-13T Cam

Which rockers would be best?

What size valves?

How much port work?

Etc
etc.....

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clubmn
 Post subject: mini1275
PostPosted: Tue Oct 23, 2007 6:12 pm 
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I have an avonbar turbo low comp head, its prob the best you can by for a blown motor. but i got that from he UK

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Fat Boy Dave
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PostPosted: Tue Oct 23, 2007 8:34 pm 
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http://vmaxscart.brinkster.net/cylinders.html

depends road or track?

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slinkey inc
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PostPosted: Tue Oct 23, 2007 8:39 pm 
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Big valves, lots of flow, de-shrounded valves, Vizard style etc.

Head wise, blown motors will benifit from the same work as N/A motors, so I've read.

Although a low comp head with big chamber's is rpobably benificial as it will mean normal pistons can be used and expensive low-comp pistons won't be necessary. You could use good 'ol Hypatecs or similiar.

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Kennomini
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PostPosted: Wed Oct 24, 2007 7:25 pm 
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how do you get a low comp head, is it something that can be done to any head?

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drmini in aust
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PostPosted: Wed Oct 24, 2007 7:37 pm 
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Kennomini wrote:
how do you get a low comp head, is it something that can be done to any head?

Yes there is lots of metal that can be milled or ground out if you know what you are doing.
Standard 1275 heads are all 21.4cc, mine on the 1310 was out to 28cc at one stage (I was running Mahle flat top pistons) and I have seen them bigger still, for turbo motors.

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buztoy
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PostPosted: Wed Oct 24, 2007 7:51 pm 
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Location: ASQUITH NSW, Engine size:1310
Quote:
Although a low comp head with big chamber's is rpobably benificial as it will mean normal pistons can be used and expensive low-comp pistons won't be necessary. You could use good 'ol Hypatecs or similiar.


thats a really really good idea, that was the whole thing that turned me off forcing my motor, 1 i could accuratly work out how much CC i needed to add to combustion chamber but the other was price of pistons,

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