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re 5ktq vacuum hose sizes...
MSV96@aol.com, aka Mike Veglia, asked:
What size and type of hose is the popular choice for vacuum line replacement
on the 5ktq? I recall a suggestion of 4 mm high pressure fuel hose...not a
common item. I have found 3.5 mm cloth covered vacuum line but it looks
compared with what is in the car. I have given up on using some viton or
"pump tube" from work as they are not really suitable for the temps and/or
oils best I can tell (and viton tubing is outrageously expensive).
So, size? Type of hose? What is the consensus? TIA
I'm surprised you find viton to be unsuitable due to temperatures. I put
Viton O-rings on my turbo corvair push-rod tubes (air cooled engine with
600F head temps) in 1967 and they lasted through 100s of laps and 100k mi
before I tore the engine down 20 years later. They had survived intact and
only taken a set that slowly recovered sitting on my work bench.
Flexibility was unimpared. I can't speak to the suitability of specific
viton hoses for vacuum line; they would require sufficient wall thickness to
avoid collapse. Otherwise, I would doubt you could harm one unless it was
draped over the turbo turbine inlet.
.... Kirby (Kirby A. Smith)
2 x 1988 90q
New Hampshire USA