Guest JAMIE T Posted April 2, 2003 Share Posted April 2, 2003 I do some work for a shop that can get JE pistons at dealer prices. If anyone has a PN for their pistons, let me know. Or, what info do I need to have on hand to order the proper pistons. I want a 87mm or 87.5mm bore. I have 9mm L24 rods and a LD28 crank. Do I need to tell THEM the pin height, or will they have that information. Quote Link to comment Share on other sites More sharing options...
Guest Zcarsmakemyheadhurt Posted April 2, 2003 Share Posted April 2, 2003 When you order pistons from JE or just about anyone you have to have them send you a build sheet the you have to fill in all the info for ordering. Good luck. Quote Link to comment Share on other sites More sharing options...
jgkurz Posted April 2, 2003 Share Posted April 2, 2003 My pistons should be almost exactly what you are looking for. You may want to go a little higher on the compression though. These were built at 7.6:1 before I was enlightened.... I have late 133mm L24 rods with a Maxima L28D crank and an 87.5mm bore. This should net out to 3.0 liters. I think you are wise to keep thick cylinder walls if you are going to boost your engine. JE Piston p/n 168155 Bore 3.445 or 87.5mm Stroke 3.268 Invdome depth .125 Comp dist 1.290 Comp Ratio 7.6 to 1 Top Ring 1.5mm 2nd Ring 1.5mm Oil ring 4.0mm Pin Dia .827 Pin length 2.5 Spiro locks used Piston weight 366 Grams Nissan OEM L28ET headgasket used with the following specs: 1.25mm height, 88mm cyl dia, 7.6CC per cyl P90 Cylinder head with 53.6 cc chambers Quote Link to comment Share on other sites More sharing options...
TimZ Posted April 2, 2003 Share Posted April 2, 2003 My pistons should be almost exactly what you are looking for. You may want to go a little higher on the compression though. These were built at 7.6:1 before I was enlightened.... I have late 133mm L24 rods with a Maxima L28D crank and an 87.5mm bore. This should net out to 3.0 liters. I think you are wise to keep thick cylinder walls if you are going to boost your engine. JE Piston p/n 168155 Bore 3.445 or 87.5mm Stroke 3.268 Invdome depth .125 Comp dist 1.290 Comp Ratio 7.6 to 1 Top Ring 1.5mm 2nd Ring 1.5mm Oil ring 4.0mm Pin Dia .827 Pin length 2.5 Spiro locks used Piston weight 366 Grams If you want to specify the CR for your application, then this is not enough information. That piston may have been built for 7.6:1 for your application, but this is completely dependent on the dimensions of the comustion chamber that you are using. The number that is missing above is the volume (usually given in cc's) of the inverted dome on the piston. The "invdome depth" number almost gets you there but it still does not give you the actual volume since you don't know the geometry of the dome. You can specify the CR to the manufacturer, but you must then also supply the volume of the combustion chamber and the volume added by the head gasket (along with bore and stroke, of course). Quote Link to comment Share on other sites More sharing options...
rags Posted April 2, 2003 Share Posted April 2, 2003 Tim, What C/R is your motor and who made your pistons? Thanks. Joe Quote Link to comment Share on other sites More sharing options...
turbobluestreak Posted April 2, 2003 Share Posted April 2, 2003 If your going to try a stroker build up you should read this first. In fact everyone should read this. http://www.zhome.com/rnt/3.1HanveyProject.htm tbs Quote Link to comment Share on other sites More sharing options...
jgkurz Posted April 3, 2003 Share Posted April 3, 2003 I have added the missing info to my post.... Quote Link to comment Share on other sites More sharing options...
TimZ Posted April 3, 2003 Share Posted April 3, 2003 Tim' date=' What C/R is your motor and who made your pistons? Thanks. Joe[/quote'] It's 7.5:1. My old pistons were Arias. I just went to a stroker crank and the new pistons were made by Diamond. It's not up and running yet, though. Quote Link to comment Share on other sites More sharing options...
jgkurz Posted April 3, 2003 Share Posted April 3, 2003 TimZ, I don't feel so bad now that I see your compression is nearly the same as mine. Everyone seems to think I should have gone with 8 or 8.5:1. Oh well..... I guess I'll just turn up the boost. Quote Link to comment Share on other sites More sharing options...
TimZ Posted April 3, 2003 Share Posted April 3, 2003 TimZ, I don't feel so bad now that I see your compression is nearly the same as mine. Everyone seems to think I should have gone with 8 or 8.5:1. Oh well..... I guess I'll just turn up the boost. For sheer power, being able to turn up the boost is much more effective than a 1 point increase in CR. You'll make that difference up in the first additional psi of boost. Quote Link to comment Share on other sites More sharing options...
rags Posted April 3, 2003 Share Posted April 3, 2003 I agree 100% with Tim's shear power statement but since I will be using the car on the street and will not be doing things nearly as radical as he has done with custom everything , I think if I increase the base CR to 8.5 it will increase torque down low and lag from a bigger turbo won't be as annoying. Been there, no fun. Besides, am I the only one who doesn't have the turbo spooled all the time? I didn't think I was that old! Joe Quote Link to comment Share on other sites More sharing options...
rags Posted April 3, 2003 Share Posted April 3, 2003 I hate seeing misspelled words after I make a post Quote Link to comment Share on other sites More sharing options...
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