how do these pistons look???

saskattakman

saskattakman

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well i pulled the topend of my srx to send to mr viper for porting....tell me what you guys think of these pistons....i am jetted 152.5 152.5 and 155....my sled is runnin cold air intake and gutted airbox...to me these look rich...what do you guys think??
 

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chevyracer68 said:
well i pulled the topend of my srx to send to mr viper for porting....tell me what you guys think of these pistons....i am jetted 152.5 152.5 and 155....my sled is runnin cold air intake and gutted airbox...to me these look rich...what do you guys think??
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those are lean, and you got some blow by.
i would replace those bad boys and up your jetting
 
not sure they are lean but i think they have alots of idlling ...about blow by they are not that bad but they leak a little
 
they "look" worn on the skirts, would need to measure them from 10mm up from bottom of skirt to be sure, because all i can do is see the pic, but usually when they are all smooth and dull looking in the circular spot like yours are, they will be under spec.
 
IMO they look rich(how'd your plugs look?), and yes make sure you Mic 'em out, you may need pistons too.

How many miles/KM on the sled?
 
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plugs always seem to look on the dark side...well measured the pistons and i think im getting between 3-5 thous wear between the 3 according to shop manual....as for kms on them lets just say above 13,000...figured its time
 
chevyracer68 said:
plugs always seem to look on the dark side...well measured the pistons and i think im getting between 3-5 thous wear between the 3 according to shop manual....as for kms on them lets just say above 13,000...figured its time
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Yea book says your only allowed 3 and with over 13kms yea it's time.

what oil you use??
 
NO DOUBT BLOW BY THERE. HARD TO SAY ON TOPS. WOULD LIKE CLOSER LOOK. WHAT I WOULD OF LIKE TO SEEN WAS THAT CARBON IN MIDDLE AND THAN CHANGEING TO LITE BROWN GOING OUT TOWARDS EDGES. DON WILL GIVE YA JET SPEC WITH YOUR NEW MOTOR. 3:16 (yammie tony)
 
i have always run shell advance non syn for the last 10,000 kms or so pv's seem to be carboned up every year...
 
chevyracer68 said:
anybody who want a better look at pictures it seem they get all discolour when i upload them to here i can email them to ya....thanks everybody for their input and advice always appreciated on this site
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shoot 'em to me i'll post 'em....
 
THATS MY THOUGHT TO MAGIC. THAT CENTER PISTON WITH CARBON IN CENTER GOING TO LITE BROWN TOWARDS EDGES WAS ALWAYS NICE. SO JUST A GUESS, BLOW BY, LEAN READING ON TOPS MEANS ALOT OF WOT RUNS ACROSS THOSE LONG LAKES. RIGHT CHEVY !! lol. 3:16 (yammie tony)
 
so you guys think install new top end with ported cyls and see where im at from there??gonna run amsoil from now on
 
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