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Author Topic:   Damaged pistons - pics - opinions?
fairlaniac
Member
posted October 17, 2003 09:35 PM
Our last race out we encountered the damage shown in these pictures (see links). Can anyone offer some ideas on what may have happened? It's a .040 Chevy 350 with 11.5:1 lightened Wiseco pistons, 2.02 heads, Brzezinski 4bbl intake with a Carter AFB. If there is any more info you need, I can supply best to my knowledge. I notice how the damage occurs near the piston ring end gap? We're looking on correcting this for next year. Oh yeah, we're running 1/2 Sunoco 94 and 1/2 Cam2 racing gas.

Pic links: http://home.dejazzd.com/thebenders/images/cyc2-2003.jpg http://home.dejazzd.com/thebenders/images/cyc3-2003.jpg http://home.dejazzd.com/thebenders/images/cyc4a-2003.jpg http://home.dejazzd.com/thebenders/images/cyc4b-2003.jpg

------------------
Doug
"Lift for a second, that's where you'll finish!"


66jj
Member
posted October 17, 2003 09:55 PM
I think you allready know, you didnt gap the rings wide enough and the ends butted.

I only needed to look at the first pic.




fairlaniac
Member
posted October 20, 2003 09:35 PM
Thanks for the response.

------------------
Doug
"Lift for a second, that's where you'll finish!"


jwht2315
Member
posted November 02, 2003 10:33 AM
quote:
Originally posted by fairlaniac:
Our last race out we encountered the damage shown in these pictures (see links). Can anyone offer some ideas on what may have happened? It's a .040 Chevy 350 with 11.5:1 lightened Wiseco pistons, 2.02 heads, Brzezinski 4bbl intake with a Carter AFB. If there is any more info you need, I can supply best to my knowledge. I notice how the damage occurs near the piston ring end gap? We're looking on correcting this for next year. Oh yeah, we're running 1/2 Sunoco 94 and 1/2 Cam2 racing gas.

Pic links: http://home.dejazzd.com/thebenders/images/cyc2-2003.jpg http://home.dejazzd.com/thebenders/images/cyc3-2003.jpg http://home.dejazzd.com/thebenders/images/cyc4a-2003.jpg http://home.dejazzd.com/thebenders/images/cyc4b-2003.jpg



Dude you had an end gap problem with te rings. They went gapped enough. Always gap them to the manufacturers specs.

ctfarm
Member
posted November 02, 2003 11:51 AM
I agree that you need more ring gap,but the pistons burnt from running too lean a fuel mixture.Check your fuel system and carb.



ssr1st
Member
posted November 02, 2003 02:41 PM
Thats a lot of damage for a flat top. Are you sure the timing marks are correct on the balancer?


racerguy500
Member
posted November 02, 2003 08:20 PM
Read the plugs, too white is lean, too dark is rich looks like a fuel problem but that should that should tell you quickly. We did that a few times and turned out to be not enough octane in the fuel combined with too lean jets in the carb. How many laps or races did it take to get it like that? Was it overheated when it happened or overheated after it happened? What kind of compression are you running by the test gauge? Need more facts but start there and hope it helps. Good luck


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