Saveit 0 Posted November 4, 2008 Hi there, I have some 205's that i use for racing. I was looking for around 150 hp, so someone told me that putting a XU10 top from a 306 2.0 XSI 8v would be the best and easiest solution. So I went with that solution. The last question that i have with regards to this matter, is how much (if any) to take off the XU10 top for the compression to be right. Since it is a car used for racing, i was told, that the compression could be as high as 12:1, with 99 oct fuel. I was told that about 1 mm would be enough - is that right? Thank you! Share this post Link to post Share on other sites
Saveit 0 Posted November 4, 2008 The modifications is of course on some standard 205 1.9 gtis. Share this post Link to post Share on other sites
Baz 421 Posted November 4, 2008 i forget the desired amount to skim for correct comp ratio, do a search though as it's a widely covered topic. Share this post Link to post Share on other sites
Saveit 0 Posted November 4, 2008 Believe me, i have searched numerous times I cant seem to find a straight answer. There are a lot of different calculations in many posts, but no real conclusion. Someone must know how much to skim the head. I am looking at about 12:1 in comp ratio, since it is a racing car. Share this post Link to post Share on other sites
Henrik P 0 Posted November 4, 2008 Believe me, i have searched numerous times I cant seem to find a straight answer. There are a lot of different calculations in many posts, but no real conclusion. Someone must know how much to skim the head. I am looking at about 12:1 in comp ratio, since it is a racing car. I think the best way is to messeure how many cc there are in pistons and head and then calculate how much there has to be skimed off. Cause you don't now if the new head has been skimed because off a blowen head gasket. Share this post Link to post Share on other sites
whizzer71 0 Posted November 4, 2008 Dont know if this will help you ? http://forum.205gtidrivers.com/index.php?showtopic=94375 Tris Share this post Link to post Share on other sites
Saveit 0 Posted November 4, 2008 Still looking for an answer Someone must know how much others have skimmed off the head. Share this post Link to post Share on other sites
Saveit 0 Posted November 5, 2008 Since i am looking for a relatively high cr, would 1.5-2.0 mm skimmed off the head be too much, if the head have never been skimmed before? Share this post Link to post Share on other sites
jimistdt 1 Posted November 5, 2008 There is a guy called 'Jakob' on this forum, also from Denmark maybe if you send him a PM he could help you Share this post Link to post Share on other sites
