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Old 01-06-2019, 08:22 PM   #1
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Direct Injected Motorcycle Engines

I couldn't find much about this other than ktm doing something with 2 strokes.
Its something I'd avoid but why isn't it being used on four stroke motorcycle engines, or is it?
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Old 01-06-2019, 11:08 PM   #2
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Not on any 4t bike I know of.

on a 4t the injection system would be too mechanically complex in order to produce the pressures required to squirt gas in a fully compressed the cylinder. Bear in mind too on a 4t, a consideration is that the fuel has to mix with air and produce a homogenous charge in order to have an ideal flame front.

On 2t, the injector is in the transfer port (not really direct injection) an area where it is not attaining high pressure.
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Last edited by Karbon; 01-06-2019 at 11:17 PM..
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Old 01-07-2019, 12:04 AM   #3
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Direct injection is becoming more common on cars. Perhaps motorcycles don't have the space for the hardware.
The car market is more competitive for meeting fuel consumption numbers. So in the interest of better numbers they may be willing to disregard long term maintenance cost to the owner.
I have port injection in my car with prevents the sooty valve issues of DI. I wouldn't buy a DI car either.
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Old 01-08-2019, 11:04 AM   #4
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Old 01-08-2019, 08:43 PM   #5
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I found one:
https://www.youtube.com/watch?v=wgELh0yJMuI

The club built it a couple years ago, it is powered by a Russian tank engine. And diesel engines have direct fuel injection.

Not sure how to post a picture on this forum, so the link is all I can provide.
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Old 01-09-2019, 07:02 AM   #6
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I found one:
https://www.youtube.com/watch?v=wgELh0yJMuI

The club built it a couple years ago, it is powered by a Russian tank engine. And diesel engines have direct fuel injection.

Not sure how to post a picture on this forum, so the link is all I can provide.
without watching, and with no knowledge of what engine it is, are you sure it's DI? Older diesels aren't: Ford used the 7.3IDI before they went DI with the 7.3 powersmoke (while equal displacement they aren't related), I believe the Chevy 6.2 and 6.5 is IDI as well, and so on.
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Old 01-09-2019, 10:34 AM   #7
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DI in a 4T gas engine is a bad thing without having secondary injectors in the intake. Without the secondary injector there is no fuel washing over the intake valves to slow the buildup of carbon. Good example of this is the Lexus IS250, the valves can carbon up every 20-30K miles and result in rough idle and a CEL. The IS 350 has secondary injectors and does not have the carbon build up issue.
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Old 01-09-2019, 01:57 PM   #8
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Orbital in Austria supposedly had a Direct Injection 2 stroke that worked pretty good. Haven't heard anything about them in years.

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Old 01-10-2019, 10:08 AM   #9
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you get carbon build up on DI (only) because oil is not filtered out in the crankcase circulation. I see some improvements in CCV designs but an aftermarket catch can in the circuit helps quite a bit.

having a second set of injections in the ports is great if for tuners. most DI only systems can't deliver enough extra fuel for mods on boosted applications.
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Old 01-11-2019, 07:29 AM   #10
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you get carbon build up on DI (only) because oil is not filtered out in the crankcase circulation. I see some improvements in CCV designs but an aftermarket catch can in the circuit helps quite a bit.

having a second set of injections in the ports is great if for tuners. most DI only systems can't deliver enough extra fuel for mods on boosted applications.
Stole my post.
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Old 01-13-2019, 09:51 PM   #11
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Don't get why the auto manufacturers don't add the catch can as a stock item.
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