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Post by brokenicarus on Aug 7, 2007 14:28:59 GMT -5
Hey gang, I was stumbling through the internets and I came across this site: www.megasquirt.info/after looking around, they seem like a pretty cool bunch. Then I found this: www.microsquirt.info/It seems custom made for motorbikes. Is there any reason this system couldn't circumvent a carb on an SR? I'd love to throw on some fuel injectors and try it out. Davey |
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Post by StewRoss on Aug 7, 2007 15:35:10 GMT -5
Hi, The word from Akira says that that the new SR for next year may come standard with FI! We'll see soon enough I guess... Not much left with carbies these days... SR  |
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Post by brokenicarus on Aug 7, 2007 16:42:41 GMT -5
How do ya feel about that? Carbies are simpler from a tinkerer's standpoint (mechanical, we can do the work on them), but Fuel injection seems pretty neat from a performance/variable standpoint (adjusting automatically for altitude, air flow, temp, etc).
Do you reckon an SR would get much better milage with a FI?
Davey
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Post by wotavidone on Aug 7, 2007 17:40:36 GMT -5
EFI is not hard. The only issue I can see is where to fit every thing on the bike.
You'd have to look around to find bike-size bits.
Throttle body with TPS, would have to come off a modern EFI single. I reckon I read somewhere that KTM make some EFI bikes? Or was it TM? Not sure. Then you need the pump, and it has to be small enough to hide somwhere, and hopefully not need a return bleed-off to the tank. Then the map-sensor. But the best bit about the whole deal would be the knock-sensor, and ignition timing control. This would enable high compression pistons, less worry about getting high octane fuel.
Would be wicked, and not that hard to do.
Maybe I'm biased, because I've helped my mate do an EFI '55 customline, and I've paid attention while he's done an early F100, and an FE Holden ute.
Its all logical, the technology has been around for years, and its practically bullet proof.
May not get better mileage, but almost certainly will get excellent grunt.
Only question mark in my mind is whether it will work with kickstart.
Mick
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Post by pablosrfivehundred on Aug 7, 2007 19:00:09 GMT -5
How do ya feel about that? Carbies are simpler from a tinkerer's standpoint (mechanical, we can do the work on them), but Fuel injection seems pretty neat from a performance/variable standpoint (adjusting automatically for altitude, air flow, temp, etc). Do you reckon an SR would get much better milage with a FI? Davey doesn't really matter to us in the USA. we never get the new cool bikes. |
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Post by StewRoss on Aug 8, 2007 2:58:57 GMT -5
Personally I prefer carbies...owner adjustable fairly easily...EFI needs electronic adjustment...I used to own an SP1 and they were able to be fitted with a Power Commander or similar or you would have probably had to change the whole system if you wanted to modify it. I recall the standard system could accomodate a shift of about 5% in any of the parameters it checked and it would adjust automatically...outside of that it no longer accomodated change. I fitted an Akrapovic Evolution system and it seemed to accomodate that OK... The little Honda 125 roadie now has FI as well. I guess if the SR comes out with it the performance should increase a little...I imagine it's all to do with pollution control... It might make it easier to tune? SR |
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Post by Bize on Aug 8, 2007 4:01:22 GMT -5
...I imagine it's all to do with pollution control... That's it exactly. Carbs are great for tinkering with and of course they are what you'd expect on a classic motor, but FI is more efficient and cleaner and (contarary to popular belief) a lot less complicated. So basically, like the 2 stroke, carbs are quickly becoming a thing of the past  |
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Post by davedunsboro on Aug 8, 2007 6:29:26 GMT -5
Yes I'm quite a fan of FI ! If its running ok that is . Usually if the things dont run its a sensor or something simple thats the problem . I still recon videos last longer & better than DVDs though ! It woudn't be too difficult to put an EFI system onto a SR there would be enough room oround the airbox , you need a pulse at the firing point so the CDI could go , (pulse could go into the EFI for spark& fuel ) , the pump could just fit anywhere with a couple of cable ties (that would run staight off the EFI) the module could fit under the seat , & the injector would have to go into a manifold (should be plenty of room as the carbys gone) . I dont think it would affect the kickstarting at all with the right system . You would still have to have a battery as I dont think it would work off a capacitor . Great topic "I'm excited" cheers frm Dave.
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Post by miker on Aug 8, 2007 8:58:48 GMT -5
A couple weeks back I made my first trip to 11,000 feet in probably 20 years. I was quite impressed that my car (with EFI) didn't feel a bit weaker at altitude, whereas we used to be lucky to get 25mph.
miker
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Post by andy on Aug 8, 2007 16:51:46 GMT -5
c'mon lads,have a sit down in front of a mirror and have a chat with yourself,these toys are classic bikes for christ sakes.think on!!! each to their own sure,but i'm one member that thinks that this aint the way forwards.
andy
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Post by colinjay on Aug 8, 2007 17:26:15 GMT -5
To hell with EFI, I am going to fit an AMAL carbie to get the real classic feel. You know, fuel leaking everywhere and having a tickler to use on those cold mornings to flood the carbie. Hmm, sound like I am talking about my G80 Matchless!
No seriously, if I was ever going to try and make a SR go really quick, programmable EFI with an integrated electronic ignition would be high on the list of must haves.
CJ
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Post by wotavidone on Aug 8, 2007 17:45:14 GMT -5
I reckon we should be able to get the best of both worlds. Maybe leave the EFI out of the deal, since I don't think any SR owner would deny that the look is very important.
But I reckon that you should be able to get a module by now that takes the place of the CDI, and adds knock sensing capability.
Sort of the same CDI ignition but auto retard for when the knock sensor says "hey, things is under a bit too much load, I'm seeing some pre-ignition here".
Cars with distributors have had this sort of thing for decades.
That's what the vacuum advance does. Its hooked up to "ported" vacuum. When you belt the throttle open, you momentarily lose that vacuum, thus the vacuum advance lets go and the spark is temporarily retarded until engine revs catch up and the vacuum is restored, which pulls the points plate around.
Since the CDI works by sensing revs and flywheel position, and deciding how long to delay the spark after it gets the trigger signal, I would have thought that some wizz kid would have added a knock sensing feature to an after market ignition by now.
Anyone know of anything?
Mick
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Post by sjef on Aug 8, 2007 18:45:46 GMT -5
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Post by wotavidone on Aug 8, 2007 19:14:40 GMT -5
Could be. I'll have to get my kids to translate it for me.
the only german my grandma taught me was "verdammt kleiner dumbkoff" excuse the spelling.
A swiss german acquaintance tells me she was not being very kind when she called me that.
Mick
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Post by sjef on Aug 9, 2007 5:13:49 GMT -5
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