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Need help getting/selecting Silicone Couplers & hoses

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Location: Sugar Land, Texas

2003 Chevrolet Impala
2003 Chevrolet Impala

PostPosted: Wed Oct 07, 2009 12:40 pm    Post subject:  Need help getting/selecting Silicone Couplers & hoses Reply with quote

I’m not putting in the turbo or engine sections because the main question is more basic… anyway this is all arising because i found a leak which looks like it will continue to get worse. The hose that connects the LT1 MAF to the TB is frayed (this is the only coupler that i am using that is not currently silicone and that didn’t have T-bolt clamps)… At the time I couldn’t find any thing better locally so I used a rubber based coupler with normal stainless clamps. Since the stainless clamps are no where close to as good as the T-bolt clamps I tightened them as much as I could which in hind sight probably cut into the coupler and with the engine movement ended up making a hole and a problem. Now I must fix the problem but I am in the need of some info so I can replace it with the correct pieces

So now for the questions

Q:1 – I guess this is the most important sets of “Q’s”, what should I be looking for in a silicone coupler or hose type product? Minimum temperature rating? Gov standard to be meet? What vendors/or sites are suggested, what vendors/site should I stay away from?

Q:2 - TB size’s – I need to know that out side diameter of the Stock TB as well as the ZZP Billet 78mm throttle body… I know what your thinking, why not just take off the TB and measure it… well first I am at work and second with the .turbo set up install on the L26 which has a much longer UIM neck that connect to the TB it is now much harder to get the TB out or even lose from the rest of the piping, I also don’t have anything to replace the current coupler so taking off the current coupler my leave me with out a “usable” coupler

Q:3 - I decided since I will likely have to order silicone hose from somewhere it would be the right time to change all the vacuum hosing to silicone hosing as well… right now I am using a rubber vac hosing that would be used for something like… IDK windshield washer fluid… anyway is there a specific inside diameter (I guess that’s what I.D. stands for) and wall thickness that I should be looking for? I am current looking at either a 4.0MM I.D. with 3mm Thick Wall or a 6.0MM I.D. with 3mm Thick Wall but I don’t know if either are to large or too small… my worry is that vac acts in the same way as our exhaust does… to large leads to pressure problems and too small leads to restriction

Thanks for the help guys


PS - On a side note I don’t think this is the cause of my LTFT mentioned in my other treads even though it is allowing metered air to escape.

2003 Impala - L26 engine, T61 Turbo, Intercooler, Plog, Elec water pump, much, much more.
1968 Impala - 327 engine, more to come soon
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