2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Vacuum Hose Diameter - 3.5 or 4

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Old 08-19-04 | 05:26 PM
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Vacuum Hose Diameter - 3.5 or 4

I've been looking up what size vacuum hose I need to replace all my small diameter lines in a 86' N/A. What's throwing me is what size for the lines, 3.5 or 4mm. Everybody's saying different things.

Btw, I'm looking at Hose Techniques since they seem to have the best prices.

Thanks

YES I SEARCHED!
Old 08-19-04 | 06:06 PM
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meh, NAPA will only sell SAE, and I've suprisingly never had a fittement issue with them. I take in an old line, say "I need the same ID" and they come back with a *VERY* damn close (usually smaller, which makes tighter fit) SAE ID.
Old 08-19-04 | 06:38 PM
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That didn't help much. Thanks for the bump though .
Old 08-19-04 | 07:05 PM
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All my vac lines are now 3.5mm, from Mazdatrix, so I can say unequivocally that they work...Yellow, so that I can write on them
Old 08-19-04 | 07:46 PM
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You have yet to let me down Wayne, so I'm going with 3.5 . Thanks.... again.......

About how many ft did you use? I've read anywhere from 15 to 30. I was just going to go with 25 in case I make mistakes. However, I don't have much money to waste...

Last edited by DerangedHermit; 08-19-04 at 07:48 PM.
Old 08-19-04 | 08:10 PM
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Aww heck, I don't know, I bought the stuff like 4 different times, as I was doing different things to the car. Never seemed to be enough, I remember that, lol...
Old 08-19-04 | 09:07 PM
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Eh, I'll just get like 25 and see how that does. If it's not enough, I'll buy more .
Old 08-19-04 | 09:43 PM
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Wow, I emailed Hose Techniques and asked a question. They responsed with a smart *** answer. Not appreciated...

Good chance they just lost my business.
Old 08-19-04 | 09:51 PM
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Dude, I've been dealing with Mazdatrix forever. They are the best bunch of guys I've ever dealt with, even Fed-Ex overnighting a package at their expense when UPS screwed me once and sent my original order half way across the country. Never had a problem with anything I've bought from them, either. They may seem expensive to some, but if you want quality parts, they're competitive compared with your Mazda dealer...

Yet another selfless plug for Mazdatrix
Old 08-19-04 | 09:56 PM
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I got some gaskets from them and they seem to be good quality and came quick in the mail. Thing is, their lines are $2/ft and Hose Techniques are $1.35/ft.
Old 08-19-04 | 10:05 PM
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And you get what you pay for...And your next question is...
Old 08-19-04 | 10:10 PM
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True that. For all I know Mazdatrix buys Hose Techniques stuff and resells it .
Old 08-19-04 | 10:18 PM
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Lol, ya got me there. Mazdatrix sure as hell will treat you better, though
Old 08-19-04 | 10:21 PM
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So far they have. I'm gonna post the email I got from Hose Techniques.

>I currently own a 1986 (2nd generation) Mazda RX-7 which is riddled with
>vacuum lines, the original ones. I'm looking to replace them and have a
>question about the black hose. How does the color compare to regular rubber
>lines black color? What exactly is glossy in this case? Do you have clear
>vacuum lines?

You question is easy...........Glossy means shiny. We do not make Clear Silicone. Look at the web site for other information.

R&D
Alright, first of all, it's "your" question. Second, I didn't have just one question. Third, I KNOW WHAT GLOSSY MEANS.
Old 08-20-04 | 12:40 AM
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http://www.mazdaformance.com/Merchan...egory_Code=470

Hose techniques kit on clearance for about half price. I have the kit on my car and there was more than enough to do just about everything and still lots extra.
Old 08-20-04 | 12:41 AM
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Too bad I don't have the money right now. That and it's not the color I would get . Thanks though.
Old 08-20-04 | 01:56 AM
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(i dont' use them) but i was wondering.... u know those "silicon" hoses in Autozone ricer section with their funky colors? my friend that owns a supra say they suck....

anyone have experiences they would like to share? and well (i don't know alot about it) can someone tell me whats the difference between good quality (and how to distinguish) from bad silicon vaccum hoses?
Old 08-20-04 | 12:22 PM
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Hmm - Yellow hose in a black car - makes me hungry for a big Mac.
Old 08-20-04 | 02:50 PM
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I've decided to go with Mazdatrix line. Wayne seems to know everything else, so I might as well go with him. That and Hose Techniques pissed me off.

Side note: Getting a tranny today, got my gasket in, HOPEFULLY I'll be able to drive the car for the FIRST time this weekend. Wish me luck.
Old 08-20-04 | 10:04 PM
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Originally Posted by SureShot
Hmm - Yellow hose in a black car - makes me hungry for a big Mac.
Just letting people know if case they didnt but mazdaformance offers flow blue and flow red. The picture with a yellow is a generic picture alot of people use to advertise the kit for FCs.
Old 08-21-04 | 11:38 PM
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Originally Posted by Cybaster
(i dont' use them) but i was wondering.... u know those "silicon" hoses in Autozone ricer section with their funky colors? my friend that owns a supra say they suck....

anyone have experiences they would like to share? and well (i don't know alot about it) can someone tell me whats the difference between good quality (and how to distinguish) from bad silicon vaccum hoses?
There was a full thread on silicone hoses and what is what a while back I participated in. It is located here.

https://www.rx7club.com/showthread.p...ne+vacuum+hose

I think on the first page I went into what Catalyst work best. If this doesnt answer all of your questions, let me know. I will be happy to help you with all of the information you need.

Jim
Old 08-22-04 | 12:07 AM
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Man, all you had to do was ask me, I would have told you, saved you a lot of time and money. Regular vacuum hose, 5/32" at autozone for 1/4 what silicone costs. Some of the cheaper silicone hose kits collapse under heat and cause more problems then they solve. You can never go wrong with traditional black rubber stuff, for usefulness or style purposes, plus it's readily available and cheap.

Oh, and that wasn't a smartass answer on their part, it was, uhm...a not-so-bright question on yours, IMO. I experience dumb *** questions on a daily basis, over the phone and via email. I have made my large, informative webpage in an attempt to combat this, but still the idiocy persists. IT is enough to drive a sane man crazy, to know that you've written all the information anyone could ever need, along with pictures, and it gets ignored anyway. To ask what color their black is, wasn't the smartest thing you could have done, IMO. It's friggen hose dude, not a paintjob on a car. It's not like it matters. You either want glossy (shiny) or standard (dull) as I see it.
Old 08-22-04 | 03:17 AM
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hey, we were all idiots in pre-school...

but hey I think High temp has a point in

https://www.rx7club.com/showthread.p...ne+vacuum+hose

But i mean, obviously Silicone hoses were made for a reason... I mean i am using traditional black rubber ones too, and true, it does work well.... but going to silicone might not be a bad idea.... what ever floats your boat....
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