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[quote="Rich B"]Thats very interesting, thanks for that. I'm a bit cautious of skimming block or heads as I don't know how much tolerance there is between the valves and the pistons at the moment. I bought the heads from Dave Barbara who paid over £2500 for them, I don't know if they have been skimmed or not but I would imagine for that kind of money, a proper job would have been done. I'm hoping all these mods will give a decent power increase although when you look at it the increase in capacity is only about 88cc. I wanted everything to run ok on the standard (albeit superchipped) ECU so I thought the 89mm pistons would be about right. I'll sort out a programmable ECU at a later date. I think you need to know where to draw the line thoug, you can get to the stage where you could have bought a decent fast car instead![/quote]
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<table border="0" cellpadding="3" cellspacing="1" width="100%" class="forumline"> <tr> <th class="thCornerL" width="22%" height="26">Author</th> <th class="thCornerR">Message</th> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>Rich B</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="templates/subRed/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Sat Dec 13, 2008 11:57 am<span class="gen"> </span> Post subject: </span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Thats very interesting, thanks for that. I'm a bit cautious of skimming block or heads as I don't know how much tolerance there is between the valves and the pistons at the moment. I bought the heads from Dave Barbara who paid over £2500 for them, I don't know if they have been skimmed or not but I would imagine for that kind of money, a proper job would have been done. <br /> <br />I'm hoping all these mods will give a decent power increase although when you look at it the increase in capacity is only about 88cc. I wanted everything to run ok on the standard (albeit superchipped) ECU so I thought the 89mm pistons would be about right. I'll sort out a programmable ECU at a later date. I think you need to know where to draw the line thoug, you can get to the stage where you could have bought a decent fast car instead!</span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/subRed/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> <tr> <td width="22%" align="left" valign="top" class="row2"><span class="name"><a name=""></a><b>rsfruitbat</b></span></td> <td class="row2" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="templates/subRed/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Thu Dec 11, 2008 2:30 pm<span class="gen"> </span> Post subject: </span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">If you dont skim anything then CR will go fro 10:1 to 10.4:1 <br />If you need to skim heads then every .1mm you skim will reduce head cc by approx 0.4cc. At least initially every 0.1mm you skim CR goes up by 0.1. Skimming block will have slightly more effect. <br /> <br />rsfruitbat</span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/subRed/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>Rich B</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="templates/subRed/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Wed Dec 10, 2008 8:25 am<span class="gen"> </span> Post subject: </span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Hi <br /> <br />Thanks for that. I'm not really looking for any specific CR, all I know is it will be raised slightly. Heads have not been skimmed as far as I know, nor has the block. The pistons are standard shape just larger (89mm) and are made from JE's 89m casting. <br /> <br />Cheers <br /> <br />Rich</span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/subRed/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> <tr> <td width="22%" align="left" valign="top" class="row2"><span class="name"><a name=""></a><b>rsfruitbat</b></span></td> <td class="row2" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="templates/subRed/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Wed Dec 10, 2008 8:20 am<span class="gen"> </span> Post subject: </span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Hi Rich b <br />Can you tell me what ratio you are after and : <br />if you have had any work done on the head chamber <br /> or them skimmed <br />or block skimmed. <br /> <br />Ideally if you can tell me the head cc's JE should be able to tell you the piston top cc's and I can calculate it for you. <br />Did a lot of this when I was building the 1400. <br /> <br />rsfruitbat</span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/subRed/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>Rich B</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="templates/subRed/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Mon Dec 08, 2008 9:07 pm<span class="gen"> </span> Post subject: </span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody"><img src="images/smiles/icon_lol.gif" alt="Laughing" border="0" /> <img src="images/smiles/icon_lol.gif" alt="Laughing" border="0" /> <br /> <br />Compression ratio will be raised slightly I think but the calculations to work it out are rather complex so I couldn't give you an accurate figure. <br /> <br />I'll be using flowed heads and billet fast road cams and anticipate power to be around 175bhp....</span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/subRed/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> <tr> <td width="22%" align="left" valign="top" class="row2"><span class="name"><a name=""></a><b>Admin</b></span></td> <td class="row2" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="templates/subRed/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Mon Dec 01, 2008 2:23 pm<span class="gen"> </span> Post subject: </span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Hi <br /> <br />Forged pistons. Ebay rip off. Should have got some genuine real pistons <img src="images/smiles/icon_wink.gif" alt="Wink" border="0" /> . <br /> <br />Look good. Keeping compression about stock? <br /> <br />All the best <br /> <br />Keith</span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/subRed/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> <tr> <td width="22%" align="left" valign="top" class="row1"><span class="name"><a name=""></a><b>Rich B</b></span></td> <td class="row1" height="28" valign="top"><table width="100%" border="0" cellspacing="0" cellpadding="0"> <tr> <td width="100%"><img src="templates/subRed/images/icon_minipost.gif" width="12" height="9" alt="Post" title="Post" border="0" /><span class="postdetails">Posted: Sun Nov 30, 2008 7:38 pm<span class="gen"> </span> Post subject: Forged pistons</span></td> </tr> <tr> <td colspan="2"><hr /></td> </tr> <tr> <td colspan="2"><span class="postbody">Hi Folks <br /> <br />My forged pistons have just arrived from the USA, thought I'd post a piccy: <br /> <br /><a href="http://img508.imageshack.us/my.php?image=pistons2gd7.jpg" target="_blank" class="postlink"><img src="http://img508.imageshack.us/img508/6069/pistons2gd7.th.jpg" border="0" /></a> <br /> <br />They're made by JE and are 89mm, hopefully this gives a new capacity of 1800cc. These will be combined with gas flowed heads and billet fast road cams (photos to follow). Should be quite quick I hope....</span></td> </tr> </table></td> </tr> <tr> <td colspan="2" height="1" class="spaceRow"><img src="templates/subRed/images/spacer.gif" alt="" width="1" height="1" /></td> </tr> </table>
