ABOUT: Lower Compression Pistons

 Lower compression pistons were tried in later model GM 6.5 in an attempt to lower piston temps and reduce pistons from 'grabbing' the cylinder walls when hot. For a manufacturer or engine builder it is easy to change pistons you just change the ones you are using in the parts bin, for those of us with them already in an engine it's a lot more involved and to be done correctly an engine rebuild is required. The cost of such is prohibitive and even if you are doing a rebuild the prices are typically way over those of stock ratio pistons.

 I have found the best thing to do is to use water-mist-injection, this keeps piston temps down acts as an air-charge cooler and also helps to keep the combustion chambers and engine oil cleaner.

 We do not want to hear of more people falling victim to marketing 'scams' diesel pages or forums to buy over priced parts when they don't need to, so we tell you other ways IF you still feel you must lower compression, and this can be done other less expensive ways than the guys trying hard to sell you on their (or their friend's) pistons will tell you,

 TECH TIP: To lower compression in GM 6.2/6.5 Diesel engines, you can either use thicker head gaskets or if you are getting new pistons, get stock ones that have some material milled off the top, the small amount milled off will make little if any difference in the strength of the piston, however lowering compression should reduce power output and efficiency of the combustion process. 
 The higher compression that can be run safely without overheating and detonation then the better the efficiency and power output, the key is to keep things cool. 

  We do offer quality pistons and rings and have lower compression available, sometimes they take longer as they are not a popular item. 

 It is bar far more wise to keep your properly running engine together by using the water-mist-injection to keep it cooler  to help it stay together.
 

 So as you can see from the above chart the site pushing products for GM diesels recommends a large bill of goods to reduce the cylinder temperatures and keep the 6.5TD running cooler, and then when your being sold on that stuff and need the engine work for the pistons you'll be advised to get splayed main caps and other nonsense you don't need and that can even be detrimental to the engine.  All that nonsense is recommended by them when one simply needs to use a quality water-mist-injection system to keep the 6.5 running cooler. 

Please Beware what you read at some so-called "information" or "resource" sites on GM diesels, often they sell the parts they're pushing, click here to read the WARNING.

   
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