Thread: fourmulas

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Is there any fourmulas to find out what wrist pin hieght u need in a custom engine. I think this is a dumb question cause i should already know but hey dont hurt to ask

Originally Posted by joe bogger

Is there any fourmulas to find out what wrist pin hieght u need in a custom engine. I think this is a dumb question cause i should already know but hey dont hurt to ask

yes you need to know your deck of your block like 9.800 or 10.200 or 10.500 11.500 there is many but the most used are 9.800 or10.200 tall deck but you can get one that is deck some .just do not guess at it know you need to know how long your rods are and 1/2 the stroke of the crank add the 1/2 of the crank stroke crank and rod now subtract from the deck of your engine this will give you the CH of the pistons .you want to subtract from you ch if you running alum rods or if you do not want to be at. O deck your block first and know were your at like 9.800 or 9.870 or ???? you want your block tru deck before you order piston

so let me see if i've got this right for example a 6 inch rod a 3.6 stroke would make a even 2 for the wrist pin

sorry 9.8 deck

Originally Posted by joe bogger

so let me see if i've got this right for example a 6 inch rod a 3.6 stroke would make a even 2 for the wrist pin

well what 9.800 yes but ?
here is one 7.680 rod 1/2 the stroke 5.500 is 2.750 know add the 2.750 and rod 7.680 10.430 block deck is 11.500 CH piston is 1.070i do this for fun

Originally Posted by joe bogger

sorry 9.8 deck

like i said BUT that CH is abit big 2.000 your rod could be bigger get you CH down

K thats what i was looking for. Thanks