Spica Vacuum Hoses - Alfa Romeo Bulletin Board & Forums
 
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post #1 of 6 (permalink) Old 09-25-2008, 07:08 AM Thread Starter
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Spica Vacuum Hoses

I replaced the vacuum lines on my car with generic, auto-parts store hoses.

Recently someone was advertising for sale the correct vacuum hoses which are supposedly superior to generic hoses.

Is it true that there are factory like correct hoses that would make a difference in the way the car ran and idled?
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post #2 of 6 (permalink) Old 09-25-2008, 07:23 AM
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do you mean the 4 lines that run from the little mounting block on the intake manifold to each cylinder ? I beleive this are the idle circuit, not really vacuum lines, so if the ID was less than original, the you would affect the idle circuit.
I think the only vacuum line (singular) on a spica engine is the big one from the intake manifold to the brake booster. I would think that this would be less sensetive to OE vs. aftermarket. Perhaps some later spica cars had vacuum advance on the distributor.

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post #3 of 6 (permalink) Old 09-25-2008, 08:10 AM
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They are "vacuum" lines in the sense that air gets sucked through them, not blown through. Anybody with a stock Spica manifold lying around probably has the original lines on it. I've had many manifolds with the braided Euro-type fuel hose and other substitutes, with no ill effects. As long as they're airtight and not too small, they should work.

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post #4 of 6 (permalink) Old 10-15-2019, 11:00 PM
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Does anyone know what the ID of the idle circuit hoses is? They appear to be 5 mm. Can anyone confirm?
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post #5 of 6 (permalink) Old 10-16-2019, 12:26 AM
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Quote:
Originally Posted by Alfastar View Post
Does anyone know what the ID of the idle circuit hoses is? They appear to be 5 mm. Can anyone confirm?
this discussion says 6 mm
https://www.alfabb.com/bb/forums/spi...oses-size.html

Dom - Alfa Spider 1990 S4 - formerly: Alfa 101 Sprint, 2600 Sprint, Montreal - family classics: Jensen Interceptor II, '58 Hooper RR Silver Cloud I, Shadow II, '60 Corvette.
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post #6 of 6 (permalink) Old 10-16-2019, 07:27 AM
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Thanks for Pointing me to the right post. I’m always amazed how much good information There is on this bulletin board that I have difficulty finding. Thanks again!
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