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Wat are compstar rods and weisco piston rated to? cause i just broke one of them...
racing at super chevy this weekend in maple grove raceway in pennslyvania, going 6000rpms on the top end nxt thing i hear clunking, i pop it in neutral and turn the car off and coast to turn off. i go to start the car back up and it wont turn over its locked up. i check the radiator and its half empty and the oil level is rediculously high.
get to the pits pull all the plugs except for #3 plug that wont budge, i go to turn the motor over by hand and it wont move in either direction. pulled the valve cover and no dropped valves everything looks normal nothing bent so im guessing a rod let go and hit the head and smashed the sparkplug cracked the head and water got in the cylinder or a hole in the cylinder wall
wat could cause this? oil pressure was good, only 6000rpms, temp at 160, air fuel was good, and the motor was rebuild with rods and pistons in march, and im only making 450 crank hp arent these rods and pistons rated to much more? just want some input of why this happened cause im stumped, i thought my motor was indestructible...Guess not
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75 Vette, NO LONGER AN LS ENGINE, now has "E85" 355 SBC, AFR 210's, forged internals and a D1SC Procharger, powerglide transmission, 4500 stall, 4.11gears, stock corvette suspension, Best ET 9.56/ Best mph 139mph
Wierd stuff happens...recently had a streetstock engine that I built all of a
sudden waste a cam lobe, trash the lifter face, vault the lifter into the bore,
hold the ex. valve open, piston broke it off, trashed the head and the piston
but still ran. Very expensive but this was midseason w/no warning signs
and the owner stayed on top of his valve lash. Everything looked fine under
the v-cover cuz the valve bent and held the spring pressure. I'm sure you'll
find exactly what (chicken or egg) happened upon tear down. SORRY for your
loss. BTW strong runnin combo !!
keep track of the injs and have them checked. Could be #3 went **** up, and toasted that piston....A/F could have been "good", til that instant..
U have any data logs?
__________________ Chuck
Hot rodding and drag racing since 55
55 Chevy/LQ9 Tyr Fryer
Turbo Buick in the 9's/142mph.
I usually log everything but this time I didn't I had a reading on the car last month racing air fuel was 12.3-12.7 so I figured I was safe when it got hotter it gets richer not leaner, I'm still at the track I'm leaving tn and tm morning I'll rip it all apart and take pictures
How many runs you did in that motor from your last rebuild?
around 50 passes give or take
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75 Vette, NO LONGER AN LS ENGINE, now has "E85" 355 SBC, AFR 210's, forged internals and a D1SC Procharger, powerglide transmission, 4500 stall, 4.11gears, stock corvette suspension, Best ET 9.56/ Best mph 139mph
more pics to come.
i had one valve snap in half so i am guessing it broke in the cylinder and the piston smashed it up and bent the rod and i have pieces all over the place, the one head is garbage but it seems like the other one is ok with a few knicks here and there so i'm hoping to just get another block crank head and 1 rod and piston and rebuild it
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75 Vette, NO LONGER AN LS ENGINE, now has "E85" 355 SBC, AFR 210's, forged internals and a D1SC Procharger, powerglide transmission, 4500 stall, 4.11gears, stock corvette suspension, Best ET 9.56/ Best mph 139mph
I think the national anthem ought to be sung in English, and I think people who want to be a citizen of this country ought to learn English and they ought to learn to sing the national anthem in English.
Yes a dropped valve could have caused it that's y I run ls2 heads instead of ls6 I'm afraid of hollow valves suck that it happened a lot of good parts ruined but I'm sure you will bounce back
__________________ 2001 b4c camaro lq4 prc 2.5 ls6 heads fast 92/92 tsp 233/239 cam hooker headers 3in true duals 6 speed ls7 clutch moser 12 bolt 3.73 gears new times coming soon, times with stock 243 heads 11.59@123.58 1.82 60ft n/a 10.91@130.52 1.72 60ft 100 shot
Wat are compstar rods and weisco piston rated to? cause i just broke one of them... 
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