edddy57
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+1 with Taz here - if using a huge amount of adjunct you would be advised to do a cereal mash first, as they do in the USA and also I'm sure at Corona. This "pre-digests" the adjuncts by using the alpha amylase of a portion of the base malt which you add, converting the gelatinised starches of the adjuncts - then you tip them (at appropriate temp) into the main mash so that the main mash doesn't scream "WTF".
In your case with your fearsome adjunct bill, I would get a stockpot or three, bring the adjuncts to around 73 degrees in a fairly thick mash and stir in about 20% of the dry base pilsener malt, stirring like buggery. The Alpha amylase attacks in less than a minute and the thick mash then turns into a sort of soup. Amazing. Then let it cool to the temp of the main mash, in your case 64 degrees and pour it in. Like feeding babies on Gerbers as opposed to HJ Whoppers :lol:
Don't worry about using up some of the base malt, plenty of enzymes left to go around - decoction mashes boil up to 2/3 of the base malt and kill the enzymes, but obviously no harm done.
Clarification: I have only ever done a single infusion when using rice and corn (usually polenta instead of corn), however I have boiled them first prior to adding to the main mash (at usual temp of 64 - 67 degrees). Given what you have said Bribie, would you still boil the rice & corn before bringing the temp down to the suggested 73 degrees and adding the 20% dry pillsner malt. Also when you say "fairly thick mash", after boiling the rice its pretty damn thick.. Do I need to add more water first?
Eddy