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Author Topic: HGT Fuel Injection kit on our YZ 144 Project.  (Read 20204 times)

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Offline snook620

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #60 on: October 11, 2011, 03:56:07 PM »
I see efi helping 4 strokes with cold starts, throttle response, less bogging, etc. But I really dont see much of an advantage on a 2 stroke besides maybe less jetting. Carbs make more power.

2000 YZ 125 under construction

Offline teriks

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #61 on: October 11, 2011, 11:09:53 PM »
If you are injecting into the combustion chamber after the exhaust port is closed (in theory anyway),why would you need an expansion chamber exhaust?
Because you inject fuel only, -cant get much of a fire without air.

Offline streaks383

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #62 on: October 12, 2011, 05:05:47 AM »
So who here has ever tested DI or FI on a performance 2T off-road bike?  If you haven't save all of your pillow talk for after its tested.  No one cares about 3  paragraphs or more with words and concepts you read or heard somewhere else and probably don't get, stating how bad DI is gonna be.  Put a sock in it until the test phase is complete.  As much as you are trying to discourage progression of the 2T I would bet you are employed by Honda.

Who exactly is testing DI here?  This thread is for EFI, which on 4-strokes is not a real step forward.  It added weight, complexity, and cost without any real significant benefit.  Do tell me how that's a good thing.  

What comes two letters after DI in my post?  Isn't TSM testing it, the point of this thread, so wait for the results before you claim no benefits.  Unless you have already tested it???
« Last Edit: October 12, 2011, 05:15:30 AM by streaks383 »

Offline SachsGS

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #63 on: October 12, 2011, 08:18:27 AM »
I realize that the crankcase is still being used as a (Schnurle loop) pump to both scavenge and charge the combustion chamber, however,if the fuel is injected into the combustion chamber after the ports are closed and those charging losses are mitigated - I can't see how an expansion chamber is required (in a DI engine - in theory).

Offline MikeD94

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #64 on: October 12, 2011, 09:33:57 AM »
Maybe I can think of why an expansion chamber would help increase HP with DI.  The expansion chamber would force more air back into the cylinder just before exhaust port closes.  Think of this as "turbocharging" from the exhaust side.  That's my theory or more accurately 2 cents.  :)

Offline teriks

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #65 on: October 12, 2011, 03:02:19 PM »
Sachs, without the pipe you end up with less air in the combustion chamber, basically what MikeD94 just wrote.
Less air - less fire - less power.

Getting eager to hear an update from Charles on the FI project :)

Offline Charles Owens

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #66 on: October 12, 2011, 03:10:09 PM »
HGT is waiting on the CNC flanges. Should be done tomorrow. :)

Offline scotty dog

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #67 on: October 12, 2011, 03:47:06 PM »
Good stuff Charles, so does that mean yous will be takin it for a rip on the weekend?
I think its making some a little anxious not knowing the outcome.
Hope it works out and makes the 144 RIP!! :D
F**K THE WHALES......................SAVE THE 2 STROKE!!!!

The hardest part about riding a 4 stroke is telling your parents your Gay!!

05 CR 250

Offline SachsGS

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #68 on: October 12, 2011, 05:09:56 PM »
Verrry interesting!

Offline Charles Owens

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #69 on: October 12, 2011, 06:41:36 PM »
Nah, I won't have it back by the weekend. They will get the parts tomorrow. I will let you guys know an ETA as soon as I get one.

I think its making some a little anxious not knowing the outcome.
Hope it works out and makes the 144 RIP!! :D

Me too! :)

Offline scotty dog

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #70 on: October 12, 2011, 07:18:12 PM »
Sweet  ;)
F**K THE WHALES......................SAVE THE 2 STROKE!!!!

The hardest part about riding a 4 stroke is telling your parents your Gay!!

05 CR 250

Offline ACMX

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Re: HGT Fuel Injection kit on our YZ 144 Project.
« Reply #71 on: October 13, 2011, 11:54:05 PM »
SOOO is it on its way?
ACMXProductions.weebly.com <-- Check it out! Now!

'Forgive me lord for I have sinned. I hit a fourth gear jump in fifth gear pinned'

The Sweet Sound of a Yz125 Two Stroke
http://www.youtube.com/watch?v=TSO3Po7uvJo

'If it takes more than two strokes, then you're just playing with