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GDI in MX bikes?

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When are we gonna see GDI in some motocross bikes? Unless, of course, factory riders all ready have it, either way I don't know. Maybe somebody out there has heard something about it?

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It will be a while. GDI is only now working its way in the automotive world in terms of being mass produced for companies such as Ford, Toyota, Volvo, etc. So with that being said it will probably take at least 5 years before we see it on MX bikes being sold to consumers.

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The other thing to remember is that GDI is, at present, mostly a means of reducing emissions and increasing fuel economy. Since there isn't really a performance boost associated with it compared to conventional EFI or carbs (except for 2T's that run a blower with the setup), there's not much motivation to add the weight and expense to an existing MX platform.

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The other thing to remember is that GDI is, at present, mostly a means of reducing emissions and increasing fuel economy. Since there isn't really a performance boost associated with it compared to conventional EFI or carbs (except for 2T's that run a blower with the setup), there's not much motivation to add the weight and expense to an existing MX platform.

No entirely true. GDI engines can run higher compression ratios since its easier to control detonation since you have fine control of how and when fuel is introduced. You can also do other tricks like giving two fuels sqirts during the power stroke to increase power.

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No entirely true. GDI engines can run higher compression ratios since its easier to control detonation since you have fine control of how and when fuel is introduced. You can also do other tricks like giving two fuels sqirts during the power stroke to increase power.

The '2 squirt' strategy isn't for more power. It's something thats used to control combustion "rattle" in common rail injected diesels. GDI also uses multiple shots of fuel but it is for emissions control. The purpose of using several small shost of gasoline is to keep combustion pressures and temperatures within a very specific set of parameters. This is done mostly for reducing oxides of nitrogen in the exhaust gas. Like stated above, the main reason for the advent of gasoline direct injection is for emissions control and fuel economy. The main reason it's seen on sleds and watercraft is for EPA compliance. Believe me, if the manufacturers could get away with using carbs on sleds and watercraft, they would. A lot cheaper, smaller parts inventory, etc.

Not that there isn't some great advantages to FI in general, but the carburetor doesn't really do a bad job for what it is and will be around for a long time.

Edited by 2grimjim

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