Is it true that HHO is not recommended for vehicles with turbochargers, superchargers or compression ratios greater than 9.5 to 1 it can cause an engine knock. They say that you can installed these kits in all makes of cars?

Yes, if you were injecting a lot of HHO because HHO ignites at about 580C when in its pure form. But when it is diluted by the air far below the self-sustaining burning level of hydrogen in air (which is 4% at atmospheric pressure), one should not worry about HHO causing engine knock. Let us do a rough calculation:

Let’s assume the production of hydrogen is 10 liters (which would be 15 liters of HHO) per minute – this is a lot of hydrogen – most kits out there can only produce 1 or 2 liters of hydrogen per minute. OK, 10 liters of hydrogen per minute getting blended with 2700 liters of air for the Sprinter running at 2000 rpm. So that is a “fuel/air” ratio of 10/2700= 0.37% – far too little hydrogen to even think about igniting, even at the Sprinter’s 18 to 1 (or higher, 35 max) compression ratio.

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