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Intake block on a 3 cube?

Four Paws

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I have a 48cc saw (Shindaiwa 488) with a tiny spigot mounted Walbro HDA. I'd like to run a larger carb, but feel the tiny intake boot and spigot will hinder the saw. I have debated welding a block on the jug.

Saw is in the 190-200 psi range - on gas.

I don't really have a goal with the saw. I'd like to be able to run it reliably in the woods. I'd consider turning it into a play thing and running alcohol...would need some guidance to get started down that route.
 

Four Paws

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Worth my time? Anyone want to talk 3-cubes...any make or model...any fuel...woods port or full on muffler saws?
 

Stihlbro

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I am all ears, willing to talk, show me some pictures of the saw with intake set up currently. May not have to weld. I need to see throttle linkage, choke and fuel line routing. Fuel.....alcohol with the work required eh, too many gas options. But hey, let's do this!!
 
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psuiewalsh

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Does the boot bolt to that cylinder? Maybe a bolt on intake?

Sent from my C771 using Tapatalk 2
 

Hedgerow

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Now we talkin...
 

Four Paws

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I will get some pictures after work. The jug has a totally round intake tract and utilizes a boot similar to Stihl. The boot and intake tract is very small internally (about as big around as a pinky finger - 1/2" or so). The design of the saw facilitates a lot of room for modification and packaging under stock covers.

Thanks for your replies so far.
 

Hedgerow

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Sometimes an intake block is the only reasonable way to get the carb the saw is begging for, onto the jug.
The 488 is a solid platform to experiment with and I've not seen many threads on them.
 

Cut4fun

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488 like yours?



!Bkhe5Qw!mk~$(KGrHqMH-EMEs9WHSQH4BL(4UR7B+!~~_35.JPG

s-l225.jpg

s-l225.jpg
 

Four Paws

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488 like yours?



!Bkhe5Qw!mk~$(KGrHqMH-EMEs9WHSQH4BL(4UR7B+!~~_35.JPG

s-l225.jpg

s-l225.jpg

Yes, That is the intake boot and carb mounting bracket (white piece) from a 488. The metal ring slides into the end of the boot once it slides through the bracket. The carb bolts on into threaded brass inserts molded into the bracket.
 

Four Paws

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Here are some pictures of the stock components. Feedback, thoughts, discussion, criticism all welcome!

IMG_20160106_3064.jpg IMG_20160106_49468.jpg IMG_20160106_1722.jpg IMG_20160106_24292.jpg IMG_20160106_338.jpg
 

Stihlbro

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I'm studying the pictures, it will take me a few times. The area on top of the spigot to back of cylinder wall looks thin. But I foresee a tillotson hl or Walbro wj doable.
 

Four Paws

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I'm studying the pictures, it will take me a few times. The area on top of the spigot to back of cylinder wall looks thin. But I foresee a tillotson hl or Walbro wj doable.

Thin-ish. I could TIG in some aluminum to fill it up. Then machine the area flat to weld the block on.

One thing I have noticed is that intake ports enter at different angles on different saws. Is there a science to this, or is it simply packaging?

Same goes for exhaust. These newer saws with cylinders tilted back seem to have the exhaust port exiting at a steep downward angle. Older saws, straight out perpendicular to the piston. Again, is this for packaging or power?
 
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