piston to wall.clearence for ls3 boost
12-16-2014, 04:41 PM
#1
Safety Car
Thread Starter
piston to wall.clearence for ls3 boost
Well my machine shop honed my block today and piston to wall came out.006 and 1 cyl .007... On the high end
Using weiscos blower pistons 2618 .part # 456x7
What do u guys run w aluminum block?opinions..?
Using weiscos blower pistons 2618 .part # 456x7
What do u guys run w aluminum block?opinions..?
Last edited by blown81bu; 12-16-2014 at 07:56 PM.
12-16-2014, 05:15 PM
#3
Safety Car
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But what?
12-16-2014, 05:40 PM
#4
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12-16-2014, 06:54 PM
#5
Tech Contributor
12-16-2014, 07:22 PM
#6
Burning Brakes
clearance
.006 depending where they took measurement .
you should be around .001-.003 I am at .004 17 lb boosted.
it don't much matter, put it together and go have fun
you should be around .001-.003 I am at .004 17 lb boosted.
it don't much matter, put it together and go have fun
12-16-2014, 07:44 PM
#7
Safety Car
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its .006 and 1 was 007 in the center of bore were the skirt mainly rides...
more of a taper up top were it was .009
so theres a little bit of disortion
my machinist said it would work but may see some blowby and noise
to make it perfect he said and i agree would be to step up to a 4.075 pistons..hone cylinders perfect and set it to .004-.004.5
i decided to send pistons back and reorder since they were off the shelf
I did have blowby before refresh
he does hone w ls deck plates and my head studs
more of a taper up top were it was .009
so theres a little bit of disortion
my machinist said it would work but may see some blowby and noise
to make it perfect he said and i agree would be to step up to a 4.075 pistons..hone cylinders perfect and set it to .004-.004.5
i decided to send pistons back and reorder since they were off the shelf
I did have blowby before refresh
he does hone w ls deck plates and my head studs
12-16-2014, 08:48 PM
#8
ISIS SUCKS FAT CHOAD
I think the factory spec is 19- 22 ten thousanths.
If your machinist recommends changing it, I'd do it.
It don't seem that he has anything to gain for having you make the switch.
I'd say it's new piston time.
If your machinist recommends changing it, I'd do it.
It don't seem that he has anything to gain for having you make the switch.
I'd say it's new piston time.
Last edited by MVP'S ZO6; 12-16-2014 at 08:51 PM.
12-16-2014, 09:48 PM
#9
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Will be loose Bret, But at least will not be hurt from not being on the other end with boost or NOS on the car. Plus his motor is what it is now with .006. The way he has been talking in here on his car more than not will have to refreshing it with new pistons again after the 2nd season with it on the street and track.
Give us your experience with what you have your motor build spec. I am not to old to learn something & retain it..
Last edited by robert miller; 12-16-2014 at 09:53 PM.
12-16-2014, 09:55 PM
#10
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its .006 and 1 was 007 in the center of bore were the skirt mainly rides...
more of a taper up top were it was .009
so theres a little bit of disortion
my machinist said it would work but may see some blowby and noise
to make it perfect he said and i agree would be to step up to a 4.075 pistons..hone cylinders perfect and set it to .004-.004.5
i decided to send pistons back and reorder since they were off the shelf
I did have blowby before refresh
he does hone w ls deck plates and my head studs
more of a taper up top were it was .009
so theres a little bit of disortion
my machinist said it would work but may see some blowby and noise
to make it perfect he said and i agree would be to step up to a 4.075 pistons..hone cylinders perfect and set it to .004-.004.5
i decided to send pistons back and reorder since they were off the shelf
I did have blowby before refresh
he does hone w ls deck plates and my head studs
12-16-2014, 10:04 PM
#11
Safety Car
Thread Starter
it will be a tighter engine when done but wont have excessive blow by...no more leaks..coolant wont be seaping out of heads due to wear n bolts..parts will be torqued rather than overtorqued..stock oil pump is in garbage.. backwards rear main seal is gone...arp bolts throughout even waterpump/oilpan...was a time bomb
"ususally they run best before they pop"
loose is power brett and i agree on this
hopfully i dont loose to much power with a tighter stronger engine 417 now
"ususally they run best before they pop"
loose is power brett and i agree on this
hopfully i dont loose to much power with a tighter stronger engine 417 now
Last edited by blown81bu; 12-16-2014 at 10:15 PM.
12-16-2014, 10:44 PM
#13
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12-17-2014, 11:38 AM
#14
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its gotta get retuned anyway with new ls2 inake and ls3 throttle body
so maybe 1 or 2 pulls on the dyno to set the rings in at ECS
so maybe 1 or 2 pulls on the dyno to set the rings in at ECS
12-17-2014, 02:48 PM
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12-17-2014, 05:47 PM
#17
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12-18-2014, 11:55 AM
#19
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Thread Starter
wiseco shipped pistons yesturday most shortest 3-4 weeks ever..Im going to asume someone ordered and canceled and i was gifted
i think were shooting for solid straight cylinders and .004-.005 piston to wall
i think were shooting for solid straight cylinders and .004-.005 piston to wall
12-18-2014, 12:26 PM
#20
Drifting
Last set of Wiescos I measured were exactly .0035 under the published bore spec. We added .001 extra clearance for a turbo engine being run on e85. So ~.0045 is what we ended up with and that engine is quiet. I would probably add up to another .001 extra to that number for a gas or higher output combo over 1000, but it all depends.