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SN95 Cobras
Rebuilding my 98 cobra 4v, need help please
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<blockquote data-quote="Atrix" data-source="post: 16769226" data-attributes="member: 203518"><p>Hey guys just bought a 98 cobra and the guy ripped me off because it had 2 spun bearings on cylinders 2&6. I had to get block bored .20 over because it was pitted, also had to get Crank welded on journals 2&6. so i bought some new rods and pistons. well the pistons i had bought are below. I was wondering will i be at 10,6:1 ratio? and if so is that gonna be pretty safe? thank you</p><p></p><p>ModMax OEM Hypereutectic Piston Set 4.6 5.4 0cc Flat Top</p><table style='width: 100%'><tr><td><table style='width: 100%'><tr><td> <ul> <li data-xf-list-type="ul">Bore Sizes: Standard (3.552"), .020" over, .030" over</li> <li data-xf-list-type="ul">Compression Distance: 1.209"</li> <li data-xf-list-type="ul">Dish Volume: 0cc (Flat Top) no valve reliefs</li> <li data-xf-list-type="ul">Pin Size: OEM .866" Piston Pins - Standard Wall</li> <li data-xf-list-type="ul">Pin Retention: Full Floating with lock rings</li> <li data-xf-list-type="ul">Ring Sizes: 1.5mm-1.5mm-3mm</li> </ul> FOR YOUR COMPRESSION RATIO WITH THESE PISTONS PLEASE SEE THE CHART BELOW<br /> <p style="text-align: left"><table style='width: 100%'><tr><td><p style="text-align: center">COMPRESSION RATIOS</p> </td><td><p style="text-align: center">2V NON PI</p> </td><td><p style="text-align: center">2V PI</p> </td><td><p style="text-align: center">4.6- 4V ALL</p> 5.4- 3V or 4V</td></tr><tr><td><p style="text-align: center">0cc Dished with 4.6 Engine</p> </td><td><p style="text-align: center">10.4:1</p> </td><td><p style="text-align: center">12.4:1</p> </td><td><p style="text-align: center">10.6:1</p> </td></tr><tr><td><p style="text-align: center">0cc Dished with 5.4 Engine</p> </td><td><p style="text-align: center">9.6:1</p> </td><td><p style="text-align: center">10.8:1</p> </td><td><p style="text-align: center">9.8:1</p> </td></tr></table></p> <br /> </td></tr></table></td><td><img src="https://www.modmaxracing.com/v/vspfiles/templates/ModMax%203%20NAV/images/clear1x1.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></td></tr></table><p></p><table style='width: 100%'><tr><td><img src="https://www.modmaxracing.com/v/vspfiles/templates/ModMax%203%20NAV/images/DBox_Border_Left_Bottom.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></td></tr></table></blockquote><p></p>
[QUOTE="Atrix, post: 16769226, member: 203518"] Hey guys just bought a 98 cobra and the guy ripped me off because it had 2 spun bearings on cylinders 2&6. I had to get block bored .20 over because it was pitted, also had to get Crank welded on journals 2&6. so i bought some new rods and pistons. well the pistons i had bought are below. I was wondering will i be at 10,6:1 ratio? and if so is that gonna be pretty safe? thank you ModMax OEM Hypereutectic Piston Set 4.6 5.4 0cc Flat Top [TABLE] [TR] [TD][TABLE] [TR] [TD][LIST] [*]Bore Sizes: Standard (3.552"), .020" over, .030" over [*]Compression Distance: 1.209" [*]Dish Volume: 0cc (Flat Top) no valve reliefs [*]Pin Size: OEM .866" Piston Pins - Standard Wall [*]Pin Retention: Full Floating with lock rings [*]Ring Sizes: 1.5mm-1.5mm-3mm [/LIST] FOR YOUR COMPRESSION RATIO WITH THESE PISTONS PLEASE SEE THE CHART BELOW [LEFT][TABLE] [TR] [TD][CENTER]COMPRESSION RATIOS[/CENTER][/TD] [TD][CENTER]2V NON PI[/CENTER][/TD] [TD][CENTER]2V PI[/CENTER][/TD] [TD][CENTER]4.6- 4V ALL[/CENTER] 5.4- 3V or 4V[/TD] [/TR] [TR] [TD][CENTER]0cc Dished with 4.6 Engine[/CENTER][/TD] [TD][CENTER]10.4:1[/CENTER][/TD] [TD][CENTER]12.4:1[/CENTER][/TD] [TD][CENTER]10.6:1[/CENTER][/TD] [/TR] [TR] [TD][CENTER]0cc Dished with 5.4 Engine[/CENTER][/TD] [TD][CENTER]9.6:1[/CENTER][/TD] [TD][CENTER]10.8:1[/CENTER][/TD] [TD][CENTER]9.8:1[/CENTER][/TD] [/TR] [/TABLE][/LEFT] [/TD] [/TR] [/TABLE][/TD] [TD][IMG]https://www.modmaxracing.com/v/vspfiles/templates/ModMax%203%20NAV/images/clear1x1.gif[/IMG][/TD] [/TR] [/TABLE] [TABLE] [TR] [TD][IMG]https://www.modmaxracing.com/v/vspfiles/templates/ModMax%203%20NAV/images/DBox_Border_Left_Bottom.gif[/IMG][/TD] [/TR] [/TABLE] [/QUOTE]
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Rebuilding my 98 cobra 4v, need help please
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