3.903" Pistons in a 3.905" Bore?
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Who's pistons are they?? .002" is too tight IMO..
Diamond usually fits theres .004" to .006". JE is usually .005"-.006". Is the motor NA? Usually with a FI or NO2 motor you will run a larger piston to wall clearance.
Diamond usually fits theres .004" to .006". JE is usually .005"-.006". Is the motor NA? Usually with a FI or NO2 motor you will run a larger piston to wall clearance.
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Make sure you measure the piston skirt approx. 1.25" below the oil ring groove and 90 degrees from the wrist pin. All piston manufactures note there pistons by the "finished" bore size. If you asked for a piston for a 4.125" bore they would make the appropriate allowances. For example this piston would be 4.120" and would allow a .005" clearance.
Heres your situation;
I assume that you have a stock bore LS1. That bore is 3.898". Lunati's pistons that you are referring to, are for a stock bore motor that is "finished honed" to a new bore size of 3.903". That is a .005" increase in bore. This will allow you to have a new clean and true cylinder wall and is the max you can increase the bore on a stock LS1 sleeve.
Buy the pistons and bring them to your machine shop. They will know what to do!
Heres your situation;
I assume that you have a stock bore LS1. That bore is 3.898". Lunati's pistons that you are referring to, are for a stock bore motor that is "finished honed" to a new bore size of 3.903". That is a .005" increase in bore. This will allow you to have a new clean and true cylinder wall and is the max you can increase the bore on a stock LS1 sleeve.
Buy the pistons and bring them to your machine shop. They will know what to do!
#12
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If you are assembling the motor yourself then I would talk to a few people that have built LS motors before like MTI or Thunder or somebody. I have done a few tractor engines and SBCs as a general guideline .003 - .007 is acceptable but that is dependant upon the type of pistons you use. If you are using the stock pistons I would try to stay around .003 definately below .005 Like was said with Forged parts you have alittle more room to work with because of thermal expansion ect ect.