L-Jet Silicone hose kit - Alfa Romeo Bulletin Board & Forums
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post #1 of 11 (permalink) Old 07-20-2019, 07:17 AM Thread Starter
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L-Jet Silicone hose kit

I wanted to post an alternative to ordering vacuum hose from another source, cutting cost by almost 75% and what I believe to be higher quality hose.
The replacement of all the hose is very straightforward, just pull the old hose and use it to measure the new piece. Here is a list of the hose sizes and application. I am only slightly generous with the measurements so don't get carried away with lengths.

1. 16" of 19mm for crank breather
2. 21" of 13mm for AAV
3. 51" of 8mm for brake boost and idle adjust
4. 60" of 6mm for vapor cannister
5. 145" of 3.5mm for all other stuff

Only thing is that the hose for the vapor cannister is different sizes on each end. Just use a small piece of the hose for the brake booster to enlarge to fit on crossover pipe better. You can use soapy water or spit to make sliding hoses on easier. if you are so inclined you can order 5 ft of 3mm for your windshield washer system but has nothing to do with your vacuum.

Just go to www.siliconehose.com, choose the vacuum hose link, choose your color and sizes and wait for the mailman! I think my order came to 37.00 USD, shipping included.

Easy Peasy!
grizzly, ghnl, sloboy89 and 1 others like this.
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post #2 of 11 (permalink) Old 07-20-2019, 12:10 PM
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Great list. Thanks for the info!
Did you use clamps with your hoses?

Last edited by doctorb; 07-20-2019 at 12:20 PM.
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post #3 of 11 (permalink) Old 07-20-2019, 12:22 PM Thread Starter
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Great list. Thanks for the info!
Did you use clamps with your hoses?
No, they grip just fine without clamps. Cleaner look too!
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post #4 of 11 (permalink) Old 07-20-2019, 05:01 PM
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I noticed the 19mm isn't vacuum rated. Has it been working for you?
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post #5 of 11 (permalink) Old 07-20-2019, 05:34 PM Thread Starter
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I noticed the 19mm isn't vacuum rated. Has it been working for you?
It's only the crankcase breather hose, not part of the vacuum system, only for aesthetics.
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post #6 of 11 (permalink) Old 07-20-2019, 05:40 PM
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Silicone hoses have a tendency to split at the ends when they are disconnected from fittings. I like to make them a little longer so that I can cut an inch or so from an end a few times before the hose becomes too short.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #7 of 11 (permalink) Old 07-20-2019, 05:46 PM Thread Starter
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Originally Posted by alfaparticle View Post
Silicone hoses have a tendency to split at the ends when they are disconnected from fittings. I like to make them a little longer so that I can cut an inch or so from an end a few times before the hose becomes too short.
Do you think it is from temp cycles, chemicals, stress from stretching??
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post #8 of 11 (permalink) Old 07-20-2019, 06:55 PM
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Quote:
Originally Posted by SkiBum View Post
Do you think it is from temp cycles, chemicals, stress from stretching??
Cut them cleanly (like with a proper hose cutter or cigar cutter) and they'll be fine, provided they're good quality. I had a silicone hose set on my Milano for ten years and when I sold the car they were like the day I bought them: never had a single one split or tear.

Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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post #9 of 11 (permalink) Old 07-20-2019, 08:09 PM
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I cannot get the one off the brake booster without it splitting. I cut it cleanly with a razor blade.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke

Last edited by alfaparticle; 07-20-2019 at 08:13 PM.
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post #10 of 11 (permalink) Old 08-17-2019, 12:44 AM Thread Starter
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Quote:
Originally Posted by SkiBum View Post
I wanted to post an alternative to ordering vacuum hose from another source, cutting cost by almost 75% and what I believe to be higher quality hose.
The replacement of all the hose is very straightforward, just pull the old hose and use it to measure the new piece. Here is a list of the hose sizes and application. I am only slightly generous with the measurements so don't get carried away with lengths.

1. 16" of 19mm for crank breather
2. 21" of 13mm for AAV
3. 51" of 8mm for brake boost and idle adjust
4. 60" of 6mm for vapor cannister
5. 145" of 3.5mm for all other stuff

Only thing is that the hose for the vapor cannister is different sizes on each end. Just use a small piece of the hose for the brake booster to enlarge to fit on crossover pipe better. You can use soapy water or spit to make sliding hoses on easier. if you are so inclined you can order 5 ft of 3mm for your windshield washer system but has nothing to do with your vacuum.

Just go to www.siliconehose.com, choose the vacuum hose link, choose your color and sizes and wait for the mailman! I think my order came to 37.00 USD, shipping included.

Easy Peasy!
repost for those interested..
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post #11 of 11 (permalink) Old 08-17-2019, 05:15 AM
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Thanks! I totally missed this before!

Adam -- 1988 Alfa Romeo Spider Graduate
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