Vacuum hose redo
10-11-17, 06:10 AM
#1
Junior Member
Thread Starter
Vacuum hose redo
Hey guys,
I'm looking at rerunning all the vacuum lines since a couple are split or damaged. I'm wondering if anyone has any experience with the best type of vacuum hose to use for this? and how do you get nice bends in the hoses? or do you really need the preformed ones from mazda? Thanks
I'm looking at rerunning all the vacuum lines since a couple are split or damaged. I'm wondering if anyone has any experience with the best type of vacuum hose to use for this? and how do you get nice bends in the hoses? or do you really need the preformed ones from mazda? Thanks
10-11-17, 10:11 AM
#5
Always Bad Advice
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The following 4 users liked this post by mdp:
10-12-17, 11:46 AM
#6
I used silicone on mine. I bought 20ft of 3.5mm and 5ft of 6mm. It was plenty for redoing all of the vacuum hoses. I also replaced the check valves with viton check valves from Dale Clark. I bought mine from boostcontroller.com.
Those are good papers on comparing viton to silicone!
Those are good papers on comparing viton to silicone!
Last edited by FrankV702; 10-13-17 at 11:12 AM.
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10-19-17, 12:21 PM
#9
RX-7 Bad Ass
iTrader: (55)
*sigh* The vacuum hose debate again.
SILICONE VACUUM HOSE WORKS GREAT ON THE FD.
A lot of the testing/misinformation on using silicone hose is from way back in the day when the hose was thin walled and fell apart if you looked at it with oil. Newer hose doesn't have this problem at all.
My go-to vendor at this point for SVH is boostcontroller.com - fits great and is very reasonably priced.
IMHO there's no big reason to use Viton hose on an FD. The only place I have Viton on my car is the lines to my catch can because they carry oil and oil vapors. I actually used SVH for years there with no problems, but got some Viton and went ahead and replaced it.
Viton hose costs more, can be harder to find, is not as flexible, and can be hard to find in the correct size (3.5mm).
I've been running the same vacuum lines on my car for ~13 years with zero failures. Also have done a number of vacuum jobs on other FD's with zero failures.
Dale
SILICONE VACUUM HOSE WORKS GREAT ON THE FD.
A lot of the testing/misinformation on using silicone hose is from way back in the day when the hose was thin walled and fell apart if you looked at it with oil. Newer hose doesn't have this problem at all.
My go-to vendor at this point for SVH is boostcontroller.com - fits great and is very reasonably priced.
IMHO there's no big reason to use Viton hose on an FD. The only place I have Viton on my car is the lines to my catch can because they carry oil and oil vapors. I actually used SVH for years there with no problems, but got some Viton and went ahead and replaced it.
Viton hose costs more, can be harder to find, is not as flexible, and can be hard to find in the correct size (3.5mm).
I've been running the same vacuum lines on my car for ~13 years with zero failures. Also have done a number of vacuum jobs on other FD's with zero failures.
Dale
10-19-17, 05:43 PM
#10
Constant threat
*sigh* The vacuum hose debate again.
SILICONE VACUUM HOSE WORKS GREAT ON THE FD.
A lot of the testing/misinformation on using silicone hose is from way back in the day when the hose was thin walled and fell apart if you looked at it with oil. Newer hose doesn't have this problem at all.
My go-to vendor at this point for SVH is boostcontroller.com - fits great and is very reasonably priced.
IMHO there's no big reason to use Viton hose on an FD. The only place I have Viton on my car is the lines to my catch can because they carry oil and oil vapors. I actually used SVH for years there with no problems, but got some Viton and went ahead and replaced it.
Viton hose costs more, can be harder to find, is not as flexible, and can be hard to find in the correct size (3.5mm).
I've been running the same vacuum lines on my car for ~13 years with zero failures. Also have done a number of vacuum jobs on other FD's with zero failures.
Dale
SILICONE VACUUM HOSE WORKS GREAT ON THE FD.
A lot of the testing/misinformation on using silicone hose is from way back in the day when the hose was thin walled and fell apart if you looked at it with oil. Newer hose doesn't have this problem at all.
My go-to vendor at this point for SVH is boostcontroller.com - fits great and is very reasonably priced.
IMHO there's no big reason to use Viton hose on an FD. The only place I have Viton on my car is the lines to my catch can because they carry oil and oil vapors. I actually used SVH for years there with no problems, but got some Viton and went ahead and replaced it.
Viton hose costs more, can be harder to find, is not as flexible, and can be hard to find in the correct size (3.5mm).
I've been running the same vacuum lines on my car for ~13 years with zero failures. Also have done a number of vacuum jobs on other FD's with zero failures.
Dale
10-21-17, 08:39 AM
#13
*sigh* The vacuum hose debate again.
SILICONE VACUUM HOSE WORKS GREAT ON THE FD.
A lot of the testing/misinformation on using silicone hose is from way back in the day when the hose was thin walled and fell apart if you looked at it with oil. Newer hose doesn't have this problem at all.
My go-to vendor at this point for SVH is boostcontroller.com - fits great and is very reasonably priced.
IMHO there's no big reason to use Viton hose on an FD. The only place I have Viton on my car is the lines to my catch can because they carry oil and oil vapors. I actually used SVH for years there with no problems, but got some Viton and went ahead and replaced it.
Viton hose costs more, can be harder to find, is not as flexible, and can be hard to find in the correct size (3.5mm).
I've been running the same vacuum lines on my car for ~13 years with zero failures. Also have done a number of vacuum jobs on other FD's with zero failures.
Dale
SILICONE VACUUM HOSE WORKS GREAT ON THE FD.
A lot of the testing/misinformation on using silicone hose is from way back in the day when the hose was thin walled and fell apart if you looked at it with oil. Newer hose doesn't have this problem at all.
My go-to vendor at this point for SVH is boostcontroller.com - fits great and is very reasonably priced.
IMHO there's no big reason to use Viton hose on an FD. The only place I have Viton on my car is the lines to my catch can because they carry oil and oil vapors. I actually used SVH for years there with no problems, but got some Viton and went ahead and replaced it.
Viton hose costs more, can be harder to find, is not as flexible, and can be hard to find in the correct size (3.5mm).
I've been running the same vacuum lines on my car for ~13 years with zero failures. Also have done a number of vacuum jobs on other FD's with zero failures.
Dale
Last edited by Sgtblue; 10-21-17 at 08:44 AM.
10-21-17, 09:52 AM
#14
Constant threat
Well...I'll never be a fan of silicone and yeah...I know there are several fan-boys of it, but here's the deal: no OEM has ever used it, and with all the R&D experience they have, the fact they don't speaks volumes. Anything you have to worry about popping off if it isn't zip-tied...sucks. There are dozens of tests/articles in this very forum that essentially scream, "DON'T USE SILICONE!!!"
Dollar for dollar you can't beat OEM rubber. The stuff survived extraordinarily well in cars for 20 + years, even back when we didn't know about heat-related reliability mods that have resulted in significant reduction in under hood temperatures, and thus much higher-survivability for the hoses, regardless of construction. And of course VITON is like OEM rubber on steroids...though admittedly yes, it is difficult to source exactly what you need. It can be done, with a little legwork. Just depends on if you want the best or are willing to settle for second best.
Dollar for dollar you can't beat OEM rubber. The stuff survived extraordinarily well in cars for 20 + years, even back when we didn't know about heat-related reliability mods that have resulted in significant reduction in under hood temperatures, and thus much higher-survivability for the hoses, regardless of construction. And of course VITON is like OEM rubber on steroids...though admittedly yes, it is difficult to source exactly what you need. It can be done, with a little legwork. Just depends on if you want the best or are willing to settle for second best.
10-23-17, 09:11 AM
#15
RX-7 Bad Ass
iTrader: (55)
Well...I'll never be a fan of silicone and yeah...I know there are several fan-boys of it, but here's the deal: no OEM has ever used it, and with all the R&D experience they have, the fact they don't speaks volumes. Anything you have to worry about popping off if it isn't zip-tied...sucks. There are dozens of tests/articles in this very forum that essentially scream, "DON'T USE SILICONE!!!"
Dollar for dollar you can't beat OEM rubber. The stuff survived extraordinarily well in cars for 20 + years, even back when we didn't know about heat-related reliability mods that have resulted in significant reduction in under hood temperatures, and thus much higher-survivability for the hoses, regardless of construction. And of course VITON is like OEM rubber on steroids...though admittedly yes, it is difficult to source exactly what you need. It can be done, with a little legwork. Just depends on if you want the best or are willing to settle for second best.
Dollar for dollar you can't beat OEM rubber. The stuff survived extraordinarily well in cars for 20 + years, even back when we didn't know about heat-related reliability mods that have resulted in significant reduction in under hood temperatures, and thus much higher-survivability for the hoses, regardless of construction. And of course VITON is like OEM rubber on steroids...though admittedly yes, it is difficult to source exactly what you need. It can be done, with a little legwork. Just depends on if you want the best or are willing to settle for second best.
I will keep debunking some of the SVH myths that have persisted for 20+ years, they need to die!
MYTH - You have to zip-tie silicone hose or it will pop off.
FALSE. If you get PROPER sized SVH, you will NOT need zip ties or glue or anything. Proper size is 3.5mm for the small lines (the majority of them) and 6mm for the larger lines (mainly boost control). It will fit SO tight and will naturally glue itself on over time that you will have to use a decent amount of force to remove it. After nearly 15 years running SVH on my car and other FD's I've NEVER seen single hose pop off. This myth stems from OLD (like late 90s) silicone vacuum hose that was a non-metric size that people made to work.
MYTH - Silicone will degrade with exposure to oil.
FALSE. This is another one from the late 90s. The old stuff would just big time degrade and weaken with exposure to oil. Modern SVH will have no problems. I wouldn't use SVH for a line that was designed to carry oil, but it's not a death sentence if it gets oil in it. I've seen an FD here with bad turbos barfing oil, check valves full of oil, etc. but the lines were perfectly fine.
I have seen and worked with old SVH and it WAS crap. Thin-walled, would big time degrade with oil exposure, and didn't fit right at all. The walls were so thin it would kink easily. I wholeheartedly agree that the old stuff was junk.
The "OEMs don't use silicone vacuum hose" is a bunk argument. SVH costs more, plain and simple. Cheap rubber hose will work fine for the car's warranty period, so in the hose goes. If the OEM hose was so great on the FD we wouldn't be talking about replacing it. Yes, there are some better grade rubber hose out there, but I'd rather go with a known good SVH then a rubber hose that could Harden, split, or degrade over time.
Boostcontroller.com currently has the 3.5mm silicone hose in stock for 95 cents per foot. About 20 feet ($20) is all you need to do an FD with extra on hand. The 6mm is $1.57 per foot, 10 feet is what I recommend for most FD's.
The only place I would look to use Viton hose is going to and from a catch can since that's nearly a pure oil environment. Few feet of 6mm Viton is all you need there. But, I ran SVH to my catch can for YEARS with no problems.
Dale
10-23-17, 09:44 AM
#16
Fanboy here.
As I said, like most owners here I’ve had to r n r the hoses occasionally for one reason or another. My silicone versions have probably saved their extra cost several times over by not breaking solenoid and check-valve nipples that certainly would’ve been broken if I’d used oem rubber.
I’m sure they r & d’d the plastic AST and radiator end-tanks too. Right after that awesome temp gauge and outstandingly researched OEM Y-pipe coupler... which is also rubber and also easily fixed with a silicone version.
And I only zip-tied those hoses that see pressure.
As I said, like most owners here I’ve had to r n r the hoses occasionally for one reason or another. My silicone versions have probably saved their extra cost several times over by not breaking solenoid and check-valve nipples that certainly would’ve been broken if I’d used oem rubber.
I’m sure they r & d’d the plastic AST and radiator end-tanks too. Right after that awesome temp gauge and outstandingly researched OEM Y-pipe coupler... which is also rubber and also easily fixed with a silicone version.
And I only zip-tied those hoses that see pressure.
Last edited by Sgtblue; 10-23-17 at 12:21 PM.
10-23-17, 11:42 AM
#17
I’ve pressurized my engine up to 30psi to look for leaks and have not had any of the silicone hoses pop off.
I also broke my oil injectoe lines when removing them so i connected them with some silicobe vacuum hose while I ordered new lines. I held off for like a month and then proccrastinated with installing them for another 2 weeks... the silicone hose had no issues running straight oil through them for the time.
I also broke my oil injectoe lines when removing them so i connected them with some silicobe vacuum hose while I ordered new lines. I held off for like a month and then proccrastinated with installing them for another 2 weeks... the silicone hose had no issues running straight oil through them for the time.