Carburettor throttle slide material

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SUMMARY

The forum discussion centers on re-engineering a 40+ year old carburettor throttle slide, addressing material flaws and performance requirements. The prototype slides were initially printed in ABS, but functional trials utilized Acetal for better thermal expansion management. Key requirements include resistance to petrol, ethanol, methanol, and LPG, along with durability against heat, wear, and impact. Owen is considering LG2 as a potential material and seeks alternatives that meet these stringent criteria.

PREREQUISITES
  • Understanding of carburettor design and functionality
  • Knowledge of material properties, specifically Acetal and LG2
  • Familiarity with thermal expansion and its effects on engineering materials
  • Experience with automotive fuel compatibility and its implications on material selection
NEXT STEPS
  • Research the mechanical properties of Acetal and LG2 for automotive applications
  • Investigate alternative materials that withstand exposure to petrol, ethanol, and LPG
  • Learn about the effects of thermal cycling on carburettor components
  • Explore advanced manufacturing techniques for precision components in carburettor design
USEFUL FOR

Automotive engineers, materials scientists, and anyone involved in the design and optimization of carburettor components for performance and durability.

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Hi.
I am re-engineering a 40+ year old carburettor design. The current throttle slide has stress raiser flaws and is the same material as the mixing chamber that it slide interfaces with. The prototype slides were printed in ABS for fitment trials. The functional trials used Acetal allowing for slide expansion to operating temperature.
Requirements:
I envisage a material that copes with:
1. Petrol, Ethanol, Methanol, LPG
2. Heat - residual heat soak with engine switched off more so than in operation
3. Wear - the mixing chamber is zinc alloy so the slide should be the sacrifical element
4. Impact - the slide is subject to single manifold pulses of 20 inHg to zero at idle as well as dealing with spring loaded slide snap-shut at deceleration.
5. High surface finish esp. for an internal piston bore as well as external sealing.
Any ideas?
Ta.
Owen.
 
Engineering news on Phys.org
Hi All.
So far, LG2 for consideration?
Any alternatives to...? Any reasons why not...?
Ta.
Owen.
 

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