Guys

 

Just a quick question. Oil cooler hoses in my Jap TT Manual are knackered. It appears that the existing pipes have been somewhat overengineered as they consist of:

 

--10mm Outside diameter nozzle fitted to car - (8mm inside diameter)

-- anodised push on grub screw connector

-- 10cm length of 10mm inside diameter braided hose

-- anodised adaptor converting 10mm inside diameter hose to 16mm inside diameter hose

-- 50cm length of 16mm inside diameter braided hose

-- anodised elbow hose end to fit to rad

 

A local auto pipe company are going to quote me for some new hose and hose ends.

 

However my question is what internal diameter hose should I go for. I mean if the 2 nozzles that these hoses connect to have an inside diameter of 8mm, then surely using a pipe with a greater diameter to this is a waste of time as will just result in a pressure drop? In which case should I just use 10mm inside diameter hose for the whole length, as this will fit nicely onto the nozzles, and simplify the whole thing?

 

Rich

Guys

 

Just a quick question. Oil cooler hoses in my Jap TT Manual are knackered. It appears that the existing pipes have been somewhat overengineered as they consist of:

 

--10mm Outside diameter nozzle fitted to car - (8mm inside diameter)

-- anodised push on grub screw connector

-- 10cm length of 10mm inside diameter braided hose

-- anodised adaptor converting 10mm inside diameter hose to 16mm inside diameter hose

-- 50cm length of 16mm inside diameter braided hose

-- anodised elbow hose end to fit to rad

 

A local auto pipe company are going to quote me for some new hose and hose ends.

 

However my question is what internal diameter hose should I go for. I mean if the 2 nozzles that these hoses connect to have an inside diameter of 8mm, then surely using a pipe with a greater diameter to this is a waste of time as will just result in a pressure drop? In which case should I just use 10mm inside diameter hose for the whole length, as this will fit nicely onto the nozzles, and simplify the whole thing?

 

Rich

 

It doesn't quite work like that, pressure drop on a reduction of diameter over a very short length is not that great compared to a reduction in diameter over a greater length if you see what i mean, I would stick with the same internal diameter as original on the long run.

Thanks mate. Interesting though because the cooler and pipework is clearly aftermarket - but the nozzles I referred to I think are original (could be wrong about that).

 

Since the nozzles are only 8mm internal diameter would it not suggest that that is the preferred internal diameter of the pipe? That said the apperture on the rad itself is about 22mm I think.

 

Ideally I guess if I can get 16mm internal diameter hose ... with the appropriate fiting for the rad at one end and a hose end for the other end that is designed to push onto a 10mm nozzle that would be grand. Not sure if such fittings are availale though!

 

Rich

I used an after market cooler to replace the original which fell apart, but i made the hoses up from 15mm (ish) diameter hose rated to 10bar and a couple of fittings from a tractor to connect to the cooler cause I'm a cheap skate

ha ha - if it works it works mate. thanks again