Strimmer carburetor insulator
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Strimmer carburetor insulator
Hi all,
The part below (shown from front & rear) is a so-called "carburetor insulator" (actually acting as an intake manifold) for a petrol strimmer.
The original part cracked due to plastic "drying" when ageing along with repetitive disassembly/reassembly.
I thus reverse-engineered it with a caliper ( ) and created a more robust version of the part.
I get it machined into a medium-hard plastic, and ... it perfectly fitted and worked the first time.
The part below (shown from front & rear) is a so-called "carburetor insulator" (actually acting as an intake manifold) for a petrol strimmer.
The original part cracked due to plastic "drying" when ageing along with repetitive disassembly/reassembly.
I thus reverse-engineered it with a caliper ( ) and created a more robust version of the part.
I get it machined into a medium-hard plastic, and ... it perfectly fitted and worked the first time.
Re: Strimmer carburetor insulator
Nice application. What kind of plastic did you use, that is heat and fuel resistant enough?
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Re: Strimmer carburetor insulator
Can we see the final product ?
BTW, nice job!
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Re: Strimmer carburetor insulator
Thx. I wondered the same to myself when I was writing the OP. I have to ask the guy that machined the part for me as it was done in a scrap of material and I can't remember. I'll be back to tell.
Yep. It is actually mounted. I'll try to disassemble to take pictures, but if the seals are sticked I won't take the risk to crack them. I'll give it a try. I will also try to have some pictures of the original part.
I forgot to tell in the OP that, despite I like to play with FreeCAD and petrol engines, I had to design my own part mainly because the spare part wasn't sold anymore and it can only be found as used part in poor conditions.
Re: Strimmer carburetor insulator
Here we are.
First about the material, it was machined into a block of PEHD 500 (which is AFAIK similar to what is used for plastic cutting boards).
About the real part. First a picture that shows what the original part look likes (from front and rear) and how it is assembled (took from the user manual). Now some real world pictures.
One with the complete assembly in the strimmer. The part is the natural color (or dirty) one between the carb and the engine. Another with the carb disassembled. You can see the front of the part and the mating face of the carb (and the paper seal that goes in between). The last one from the true front of the part where you can see the piston through the intake hole (2-stroke engine). Unfortunately the seal at engine side is sticked thus I can't picture the other side of the part ATM.
First about the material, it was machined into a block of PEHD 500 (which is AFAIK similar to what is used for plastic cutting boards).
About the real part. First a picture that shows what the original part look likes (from front and rear) and how it is assembled (took from the user manual). Now some real world pictures.
One with the complete assembly in the strimmer. The part is the natural color (or dirty) one between the carb and the engine. Another with the carb disassembled. You can see the front of the part and the mating face of the carb (and the paper seal that goes in between). The last one from the true front of the part where you can see the piston through the intake hole (2-stroke engine). Unfortunately the seal at engine side is sticked thus I can't picture the other side of the part ATM.
Re: Strimmer carburetor insulator
Thanks for the material and thanks for showing. I can imagine how the other side looks like, so let it stuck , it won't get better by removing.
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Re: Strimmer carburetor insulator
A comment made on reddit
@openBrain have you thought about that?I would double check the material's gasoline resistance.
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Re: Strimmer carburetor insulator
Chemical resistance is indeed high, I have already used PE - though not with the HD extension - with fuel and had no issues. The temperature is something to think about, the data sheets talk about +80° (Celsius I guess!).
https://www.otvplast.eu/semi-finished/t ... lyethylen/
https://www.otvplast.eu/semi-finished/t ... lyethylen/
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