The Triumph Dolomite Club - Discussion Forum

Posted: **Sun Apr 30, 2017 4:06 pm**

for my 74 sprint what size heater pipes do i need ? Chris witor does two types

Thanks dave/color]

Posted: **Sun Apr 30, 2017 8:26 pm**

new to this wrote:for my 74 sprint what size heater pipes do i need ? Chris witor does two types

Thanks dave/color]

Dave

Do you mean the rubber pipes going to the heater matrix (two pipes going to the bulkhead) like this one
https://www.rimmerbros.co.uk/Item--i-GZA1336

Paul

Posted: **Sun Apr 30, 2017 10:17 pm**

Flyfisherman wrote:
new to this wrote:for my 74 sprint what size heater pipes do i need ? Chris witor does two types

Thanks dave/color]

Dave

Do you mean the rubber pipes going to the heater matrix (two pipes going to the bulkhead) like this one
https://www.rimmerbros.co.uk/Item--i-GZA1336

Paul

Paul

No i mean the metal H pipe,theres two types what one do i need

Thanks Dave

Posted: **Sun Apr 30, 2017 10:30 pm**

It depends on year of engine which H pipe to use, the smaller one is (IIRC) up to 76 and the bigger one is 76>. If you don't have one at all, chances are yours is the early type as the bigger one bolts in under the inlet manifold and is never normally removed.

Steve

Posted: **Sun Apr 30, 2017 10:48 pm**

new to this wrote:
Flyfisherman wrote:
new to this wrote:for my 74 sprint what size heater pipes do i need ? Chris witor does two types

Thanks dave/color]

Dave

Do you mean the rubber pipes going to the heater matrix (two pipes going to the bulkhead) like this one
https://www.rimmerbros.co.uk/Item--i-GZA1336

Paul

No i mean the metal H pipe,theres two types what one do i need

Thanks Dave

Dave as you have a 74 sprint, I'm going to say you need the smaller one.

http://www.chriswitor.com/prodimages/152524SS_small.jpg
Paul

Posted: **Mon May 01, 2017 2:05 pm**

Flyfisherman wrote:
new to this wrote:
Flyfisherman wrote:

Dave

Do you mean the rubber pipes going to the heater matrix (two pipes going to the bulkhead) like this one
https://www.rimmerbros.co.uk/Item--i-GZA1336

Paul

No i mean the metal H pipe,theres two types what one do i need

Thanks Dave
Dave as you have a 74 sprint, I'm going to say you need the smaller one.

http://www.chriswitor.com/prodimages/152524SS_small.jpg
Paul

Paul

Thanks for your help

Dave

Posted: **Mon May 01, 2017 2:10 pm**

Carledo wrote:It depends on year of engine which H pipe to use, the smaller one is (IIRC) up to 76 and the bigger one is 76>. If you don't have one at all, chances are yours is the early type as the bigger one bolts in under the inlet manifold and is never normally removed.

Steve

Steve

Thanks,is it possible to change from the small H-pipe to the larger H-pipe set up,and is there any advantage ?

Dave

Posted: **Mon May 01, 2017 8:07 pm**

new to this wrote:
Carledo wrote:It depends on year of engine which H pipe to use, the smaller one is (IIRC) up to 76 and the bigger one is 76>. If you don't have one at all, chances are yours is the early type as the bigger one bolts in under the inlet manifold and is never normally removed.

Steve
Steve

Thanks,is it possible to change from the small H-pipe to the larger H-pipe set up,and is there any advantage ?

Dave

Not sure if a change is possible, you may need a different inlet manifold, but i've never tried! As far as I know, the only advantage of the later type is that you don't have an inaccessible rubber hose under the inlet.

Steve

Posted: **Mon May 01, 2017 10:15 pm**

The standard inlet manifolds for a sprint are all the same, but to do the swap as you want to do you will require the following parts:
UKC3309 - Adaptor water pipe
TL11 - olive
101302 - Nut - pipe to adaptor
TKC1196 - stainless steel pipes
152525 - Rubber pipe
2 x jubilee clips

Paul

Posted: **Tue May 02, 2017 10:03 pm**

Flyfisherman wrote:The standard inlet manifolds for a sprint are all the same, but to do the swap as you want to do you will require the following parts:
UKC3309 - Adaptor water pipe
TL11 - olive
101302 - Nut - pipe to adaptor
TKC1196 - stainless steel pipes
152525 - Rubber pipe
2 x jubilee clips

Paul

Paul

thats good to know,the larger H pipe will be easier to modifiy

Dave

Posted: **Sat May 06, 2017 9:32 pm**

Hi has any one cut open a H heater pipe,what id like to know is where the H by pass section is would that be a smaller hole in the pipe ?

Thanks Dave

Posted: **Sat May 06, 2017 10:46 pm**

new to this wrote:Hi has any one cut open a H heater pipe,what id like to know is where the H by pass section is would that be a smaller hole in the pipe ?

Thanks Dave

Dave

have a look at the this thread viewtopic.php?f=4&t=17830

Paul

Posted: **Sun May 07, 2017 11:45 am**

Flyfisherman wrote:
new to this wrote:Hi has any one cut open a H heater pipe,what id like to know is where the H by pass section is would that be a smaller hole in the pipe ?

Thanks Dave

Dave

have a look at the this thread viewtopic.php?f=4&t=17830

Paul

paul

Thanks,does the water flow from the pump and return to the manifold ?

Dave

Posted: **Sun May 07, 2017 1:19 pm**

No, the heater is in parallel to the radiator (it's doing precisely the same job just putting the heat somewhere useful) cold (relatively) water goes into the block, round the cylinders and up into the head. The hot water comes out the front of the head to the stat then depending on the temperature either goes through the radiator to cool down or straight back to the inlet side of the pump.

A smaller amount of hot water comes out at the stat to heat the inlet manifold and the heater takes its feed from that, the heater return goes to the inlet side of the pump as the water should be considerably colder.
The H in the pipework is to still allow some flow through the manifold when the heater is off so you don't have a hot front carb and a cold rear one.

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