What size is this hose?

You will think that it is 1 1/2 inch hose.. but it isn't. It's something metric but you can use the next size up in silicone hose, 1 5/8" or 1 9/16 if you can find it. The 1 5/8" is a good fit unless I remembered my fractions incorrectly..

Lester
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I couldn't find 1 9/16" and the 1 5/8 is a damn good fit.

 

I believe it is a 40mm ID on that hose. 1 5/8 is 42mm and 1 1/2 is 38mm. Either way you are off by 2mm . I would go 1 1/2 for a tight fit rather than clamping down on the hose

 

1 and 5/8 fits much better.

 

On my 82 the lines are 1-1/2

 

They are metric. That's why you get different answers for US sizing. The world is a small place now, metric silicone hose is not hard to get. I bought a meter (3 feet for 'Mericans) from these people to do all of the couplings and so far it seems like good stuff.

Ash 90 Degree Silicone Silicon Hose Elbow Bend Rubber Coolant Hose Water | eBay

 

buy a metric hose here in europe

ciao

 

Just to share:

I get all tubing and clamps and anything, metric or SAE, from:

McMaster-Carr

Matt

 

DO NOT TRY the 1 1/2 " Silicone hose. It does not stretch enough like a rubber hose, it will not fit well on the pipe and you will spend entirely too long trying to make it fit. Heating the hose won't help and when you finally get smart and buy the larger hose it will slip right on and you will wonder what on earth you spent those last 3 hours doing.. or so I've heard…

Matt, I didn't even think about McMaster-Carr, I wanted something close by and didn't even plan on the silicone but when the guy at the counter brought out standard rubber line when i asked for Green Stripe? White stripe? whatever it was I knew that I needed to go a different way.

Lester

 

on my 328, the measured outside diameter of the metal pipe is 39,5 mm. 1" = 25,4 mm

ciao
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Which diameter? Or put another way, will they take it back if it's too small?? ;-)

 

The size is 40 mm with specs according to DIN 73411. 40 mm is the inner diameter, DIN means German industrial standard and 73411 is the standard for automotive cooling system hot-water flexible hoses. This is what all Ferrari specialists in Europe use for 308/328 and you can buy the hoses per meter at Superformance in the UK.

 

you can not buy elbows in meter, only straight hoses.

I just ordered a complete set of waterhoses incl. elbow and heating hoses for a 308 QV. the elbow size is 40 mm, but a 41 elbow also will fit

 

This overview pic might be of help when replacing the flex water hoses
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Gates 20267

 

Hello all,
These are 40mm hose, if you replace all with silicone, much better.
I buy mine on the local market by the meter, not that expensive (at least not in Spain).

Hint: use spring clamps instead of screw type and forget about retightening.

John

 

Yes, the silicone hoses last for ever and keep their good looks. I replaced with original Gates 40 mm that lasted for 30 years, so I will have to redo the job when I approach 90

 

i purchased all my hoses from NAPA. the clamps, wherever i could get NORMA.