So I flycut my pistons.....
05-21-2011, 12:44 PM
#1
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So I flycut my pistons..... I did the free flycutting mod (aka sand paper and big valves) and Im still nervous about running the car. Its a Trex with 59cc ported 5.3s. I took out .100 intake and .80 out of the exhaust. Im sure I did it right but Im still nervous since this is my first time flycutting and running a huge cam.
I used a feeler gauge to measure the correct depth taken out of each piston. I measured from the lowest point in the cut.
I used a feeler gauge to measure the correct depth taken out of each piston. I measured from the lowest point in the cut.
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05-21-2011, 05:59 PM
#10
want a better idea if it is going to kiss ? clay the piston . only thing done by hand each piston might be off a slight amount . so maybe take the one oyu did the least amount of time on .
in case anyone wants to know about claying .
you can have a head on if you want we just need to check one to check piston to valve .
so remove the pushrods if one of the heads is still on . the other head has to be off .
anyway , go to wally world .
buy some play-doo .
place not too thick but a hamburger patty (not mega size) on a single piston .
re-assemble with gasket included . just like it is going back together .
make sure you torque the head to specs .
now all you got to do is remember which cylinder you put the play-doo on and assemble the intake and exhaust rockers for that particular cylinder with pushrods and dont forget the rocker rail .
put the car in neutral and rotate the crank at least one full turn .
take the head back off and look at your doo . if it is cut through that is a no go .
remove and measure . try using a burger flipper thing or putty knife very slow .
when measuring i was always told to give about .100 on both the int. and exh. side (technically .080 on exhaust but i dont gamble on hard work unless it is really worth it , so play safe ).
so anything above should be good to go .
in case anyone wants to know about claying .
you can have a head on if you want we just need to check one to check piston to valve .
so remove the pushrods if one of the heads is still on . the other head has to be off .
anyway , go to wally world .
buy some play-doo .
place not too thick but a hamburger patty (not mega size) on a single piston .
re-assemble with gasket included . just like it is going back together .
make sure you torque the head to specs .
now all you got to do is remember which cylinder you put the play-doo on and assemble the intake and exhaust rockers for that particular cylinder with pushrods and dont forget the rocker rail .
put the car in neutral and rotate the crank at least one full turn .
take the head back off and look at your doo . if it is cut through that is a no go .
remove and measure . try using a burger flipper thing or putty knife very slow .
when measuring i was always told to give about .100 on both the int. and exh. side (technically .080 on exhaust but i dont gamble on hard work unless it is really worth it , so play safe ).
so anything above should be good to go .
05-23-2011, 03:46 PM
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Sharp edges anywhere in the combustion chamber or on the piston tops promote "hotspots" which will cause detonation... big no no. just make sure you gently massage the edges and you'll be fine.
05-23-2011, 04:19 PM
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just measure the thickness and brake out the old pencil and paper
Stock pistons will come out the top and hit the head. Can't be done as far as I know.
So could I just make a solid roller, clay without a gasket, measure the clay and add the gasket thiciknees to the measurement in the clay?
05-23-2011, 07:54 PM
#18
want a better idea if it is going to kiss ? clay the piston . only thing done by hand each piston might be off a slight amount . so maybe take the one oyu did the least amount of time on .
in case anyone wants to know about claying .
you can have a head on if you want we just need to check one to check piston to valve .
so remove the pushrods if one of the heads is still on . the other head has to be off .
anyway , go to wally world .
buy some play-doo .
place not too thick but a hamburger patty (not mega size) on a single piston .
re-assemble with gasket included . just like it is going back together .
make sure you torque the head to specs .
now all you got to do is remember which cylinder you put the play-doo on and assemble the intake and exhaust rockers for that particular cylinder with pushrods and dont forget the rocker rail .
put the car in neutral and rotate the crank at least one full turn .
take the head back off and look at your doo . if it is cut through that is a no go .
remove and measure . try using a burger flipper thing or putty knife very slow .
when measuring i was always told to give about .100 on both the int. and exh. side (technically .080 on exhaust but i dont gamble on hard work unless it is really worth it , so play safe ).
so anything above should be good to go .
in case anyone wants to know about claying .
you can have a head on if you want we just need to check one to check piston to valve .
so remove the pushrods if one of the heads is still on . the other head has to be off .
anyway , go to wally world .
buy some play-doo .
place not too thick but a hamburger patty (not mega size) on a single piston .
re-assemble with gasket included . just like it is going back together .
make sure you torque the head to specs .
now all you got to do is remember which cylinder you put the play-doo on and assemble the intake and exhaust rockers for that particular cylinder with pushrods and dont forget the rocker rail .
put the car in neutral and rotate the crank at least one full turn .
take the head back off and look at your doo . if it is cut through that is a no go .
remove and measure . try using a burger flipper thing or putty knife very slow .
when measuring i was always told to give about .100 on both the int. and exh. side (technically .080 on exhaust but i dont gamble on hard work unless it is really worth it , so play safe ).
so anything above should be good to go .
05-23-2011, 08:15 PM
#20
want a better idea if it is going to kiss ? clay the piston . only thing done by hand each piston might be off a slight amount . so maybe take the one oyu did the least amount of time on .
in case anyone wants to know about claying .
you can have a head on if you want we just need to check one to check piston to valve .
so remove the pushrods if one of the heads is still on . the other head has to be off .
anyway , go to wally world .
buy some play-doo .
place not too thick but a hamburger patty (not mega size) on a single piston .
re-assemble with gasket included . just like it is going back together .
make sure you torque the head to specs .
now all you got to do is remember which cylinder you put the play-doo on and assemble the intake and exhaust rockers for that particular cylinder with pushrods and dont forget the rocker rail .
put the car in neutral and rotate the crank at least FOUR full turns .
take the head back off and look at your doo . if it is cut through that is a no go .
remove and measure . try using a burger flipper thing or putty knife very slow .
when measuring i was always told to give about .100 on both the int. and exh. side (technically .080 on exhaust but i dont gamble on hard work unless it is really worth it , so play safe ).
so anything above should be good to go .
in case anyone wants to know about claying .
you can have a head on if you want we just need to check one to check piston to valve .
so remove the pushrods if one of the heads is still on . the other head has to be off .
anyway , go to wally world .
buy some play-doo .
place not too thick but a hamburger patty (not mega size) on a single piston .
re-assemble with gasket included . just like it is going back together .
make sure you torque the head to specs .
now all you got to do is remember which cylinder you put the play-doo on and assemble the intake and exhaust rockers for that particular cylinder with pushrods and dont forget the rocker rail .
put the car in neutral and rotate the crank at least FOUR full turns .
take the head back off and look at your doo . if it is cut through that is a no go .
remove and measure . try using a burger flipper thing or putty knife very slow .
when measuring i was always told to give about .100 on both the int. and exh. side (technically .080 on exhaust but i dont gamble on hard work unless it is really worth it , so play safe ).
so anything above should be good to go .
pretty much what he said, but you want to turn it over four times so that it goes through all four strokes. if you only do one turn, you might be rotating that cylinder through the compression stroke (all valves closed) and you wont get any readings.