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Grid on the piston Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive World>> General Discussions Jocky New User Mar 16, 2011, 12:57 AM Post #1 of 3 (2912 views) Grid on the piston Sign In I found there are some cross marks on a Nissan VQ V6 engine piston. As shown above, there are some grid on the piston shirt. Are those marks are designed for a specific purpose or just exist due to their manufacturing process? Thanks. re-tired Veteran / Moderator Mar 16, 2011, 3:29 AM Post #2 of 3 (2908 views) Re: Grid on the piston Sign In Pistons from various mfg have this . I understand they are to relieve surface tension which helps prevent the proliferation of cracks. LIFE'S SHORT GO FISH Tom Greenleaf Ultimate Carjunky / Moderator Mar 17, 2011, 12:45 AM Post #3 of 3 (2898 views) Re: Grid on the piston Sign In Add: If you need pistons engine is junk, T   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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