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Heads and Cylinders All about your porting, compression, rings, cylinder and piston modifications to your bicycles engine

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  #21  
Old 05-11-2016, 02:21 AM
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exokinetic exokinetic is offline
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Default Re: Do aftermarket cylinder jugs exhist?

My dream component is a knock sensor, a high definition crank position sensor, and a computer controlled ignition system that keeps the spark advance at the absolute maximum, and takes timing out when it needs too as it senses knock.

So you ride the maximum spark advance curve no matter what the conditions are.

Colder outside? Hotter? Elevation Change? Humidity Change?

Knock sensor loop compensates.

Change Fuel? Raise Compression? New Pipe?

Knock sensor loop compensates.

Jetting not quite right? Yea, you will be slightly down on power, but the knock sensor loop will be giving you the maximum available power from the current jetting.

It's what makes today's turbo cars -gas and diesel- so much more efficient than their pre-knock sensor brethren.

Apollo Moto Racing is currently in the R&D phase researching the necessary components, and how to engineer a system of incorporating them into the "China Girl" type 2 stroke engine.
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  #22  
Old 05-11-2016, 06:59 PM
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mogollonmonster mogollonmonster is offline
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Default Re: Do aftermarket cylinder jugs exhist?

Get on it bro! That would be sweet! Anything to help straighten out the kinks in these little engines!
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  #23  
Old 05-12-2016, 06:48 AM
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Default Re: Do aftermarket cylinder jugs exhist?

I have some experience with knock sensors from work I did on my 84 and 85 SVOs and and 94 Supercoupe. The 84 dropped the timing back 3 degrees when it picked up a hit, the 86 dropped it back 1 degree at a time up to 5 or 6 IIRC and the 94 was almost totally ineffective as far as I could tell. It is simply a tuned crystal microphone.

My Grubee GT5A had an odd rattle under heavy load, like popcorn popping sound. It is detonation. It bent the head and blew the gasket and would have eventually taken out the bearings. What was the answer? Cylinder head chamber design.

Evolved machine design goes from simple machine to add on features to incorporated features and mature designs that simplify again by incorporating the features into the basic design. Add-ons like knock sensors are a band-aid.

Steve
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  #24  
Old 05-12-2016, 08:06 PM
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mogollonmonster mogollonmonster is offline
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Default Re: Do aftermarket cylinder jugs exhist?

I didn't want to be the one to point that out... EFI systems are a bit more complex, but would address more of the issues, again only a band aid. The chainsaws I refered to run like sexually assaulted primates to begin with, adding EFI just eliminates tuning and makes starting a little easier. In the real world, the difference isn't as noticeable as you would think, at least not in my experience, in fact, the carbureted MS 290 has noticeably more poop than it's EFI counterpart, again in my experience.

Again any thing that can be bolted to a ChinaGirl to make it run better, and actually works, gets my vote. Especially if it will out last the 3000 mile lifespan of these cylinders, so I can use it on the next one.
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  #25  
Old 05-12-2016, 10:43 PM
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Default Re: Do aftermarket cylinder jugs exhist?

I`m on over 10 tanks of gas now, losing count.
Cylinder got scratched up bad from running the original aircleaner.
Running a better air cleaner now and still the scratchy cylinder with some porting.
Making good power and runs all day at around 50-60 kph. Love these things.

Steve

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  #26  
Old 05-12-2016, 11:41 PM
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mogollonmonster mogollonmonster is offline
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Default Re: Do aftermarket cylinder jugs exhist?

Nice bike Steve! Needs more maple leaf than that itty bitty one, and don't you hate the cable mess? I don't pedal much, only to start, needless to say, things simplified after paint...

I was at 2,756 miles, before my CDI took a dirt nap, the first part failure. I've never had the head off, no clue what nastiness is going on in there. Going to pull the head soon though, around 3000 maybe, probably the jug too, as I think I heard the needle bearing the other day...

Oh and I see that tank dimple from the handlebars, were you on it when it fell over, or am I way off the mark? I only bring it up cuz ise gots one too! It almost hurt, nearly ate an Avalon.
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  #27  
Old 05-13-2016, 03:09 AM
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Default Re: Do aftermarket cylinder jugs exhist?

Quote:
Originally Posted by sbest View Post
I have some experience with knock sensors from work I did on my 84 and 85 SVOs and and 94 Supercoupe. The 84 dropped the timing back 3 degrees when it picked up a hit, the 86 dropped it back 1 degree at a time up to 5 or 6 IIRC and the 94 was almost totally ineffective as far as I could tell. It is simply a tuned crystal microphone.

My Grubee GT5A had an odd rattle under heavy load, like popcorn popping sound. It is detonation. It bent the head and blew the gasket and would have eventually taken out the bearings. What was the answer? Cylinder head chamber design.

Evolved machine design goes from simple machine to add on features to incorporated features and mature designs that simplify again by incorporating the features into the basic design. Add-ons like knock sensors are a band-aid.

Steve

So why then would modern turbo cars still have knock sensors, with much more advance logic.

Like for instance the new Ford Ecoboost, that has basically become a legend of efficiency and performance.

Yea, it uses a knock sensor...
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  #28  
Old 05-13-2016, 03:43 AM
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mobike91 mobike91 is offline
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Default Re: Do aftermarket cylinder jugs exhist?

Have any of you guys seen the GT80 engine that costs $200 from kings? Its pretty neat for what it is. I did a piston skirt job on my piston tonight. Let me know what you guys think. Also check out the porting job they did on the jug.



Doing this from my cellular device. Gotta post one pic at a time lol
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  #29  
Old 05-13-2016, 03:44 AM
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mobike91 mobike91 is offline
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Default Re: Do aftermarket cylinder jugs exhist?

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every run is a test run . . . and i just hope it dont blow up - wil
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  #30  
Old 05-13-2016, 03:46 AM
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mobike91 mobike91 is offline
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Default Re: Do aftermarket cylinder jugs exhist?

This one shows the piston at top dead center and no skirt in the breathing passage.

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