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 Be Stihl My Heart

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Darth
Active Member


Posts : 26
Join date : 2012-04-26

PostSubject: Be Stihl My Heart   Mon May 21, 2012 12:48 am

I know ... stupid title ...

Since I had this (it's in great condition) I thought I would use it. It's a (41cc) Stihl 011. From everything I'm reading on the chainsaw forums, they were very "torquey" for their size.

Had I known before I started, I would have looked for something else because (as you know) if you need parts ... it's the Stihl dealer ... most of the time anyway. Live and learn.

Surprisingly enough ... I can get everything I need.

I spent most of the evening cutting away what I didn't want ...

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Darth
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Darth
Active Member


Posts : 26
Join date : 2012-04-26

PostSubject: Re: Be Stihl My Heart   Wed May 23, 2012 11:25 pm

I did a temporary re-assembly so I could determine my exhaust and intake port timing.

If I fabricate and expansion chamber, I'll need this information.



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Darth
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blake hobbs
Rookie Member


Posts : 3
Join date : 2012-08-24

PostSubject: Re: Be Stihl My Heart   Tue Aug 28, 2012 12:19 am

will 41 cc be enough?, im trying to find a motor of a suitable size but i have no idea where to start, though whatever i do end up using i will probably machine a new connecting rod and piston so it can run alcohol. (but that is just when i get bored).
any help recommending a motor will be greatly appreciated.
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Darth
Active Member


Posts : 26
Join date : 2012-04-26

PostSubject: Re: Be Stihl My Heart   Tue Aug 28, 2012 12:42 am

You would be better off waiting for one of the "pro's" to answer this. I'm as new as you are. Lately I haven't even been working on this because of a Kaw Triple I'm working on.

I only started on this engine because I got the entire chainsaw for "cheap" ...

Sorry I couldn't help ... Good luck !! Very Happy

Darth
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George Lane
Admin


Posts : 120
Join date : 2012-01-21
Location : Northern Virginia

PostSubject: Re: Be Stihl My Heart   Tue Aug 28, 2012 12:03 pm

From my experience 41cc is fine for tooling around a parking lot, if you want to be competative in a 35+ lb. 1/4 scale drag car you need 70+cc. This is just my opinion.
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George Lane
Admin


Posts : 120
Join date : 2012-01-21
Location : Northern Virginia

PostSubject: Re: Be Stihl My Heart   Tue Aug 28, 2012 12:47 pm

Another thought, the port timing and size on chainsaw engines is designed by the mfg. to limit rpm and hp levels with durability and reliability the primary objective unless you have experiance in modifying them it is better left to a pro. The biggest power gain is NOS and advancing the timing. I ran alcohol in my rail and the major benifit was the engine was more resistant to detonation on very hot days. The only changes required for alky was the replacement of the needle and seat with one designed for alkey and seting the fulcrum lever in the carb to lift the needle earlier and higher. You can increase compression by usung a thinner gasket between the block and cylinder. Alcohol is hydroscopic, it attracks water, and corosive. I had to use the non aerosol wd40, available at Napa in 1 gal cans, as a after run to flush the fuel system. Drain the fuel tank, put 4-5oz. of wd40 in the tank or connect a small tank with wd40 in it to the carb, restart the engine and run it until it runs rough and smokes like hell and it is ready for storage.
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blake hobbs
Rookie Member


Posts : 3
Join date : 2012-08-24

PostSubject: Re: Be Stihl My Heart   Fri Aug 31, 2012 1:52 am

awesome, thanks guys. Another quick question, i have a spiral ring and pinion gear from a big grinder it is about 2 inches tall (ring) and the ratio is 2.75, think that will be good enough? my dad races top alcohol and thinks that its just going to break. thoughts?
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