Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: Balnking the heating circuit
voucht

posted on 11/3/18 at 05:23 PM Reply With Quote
Balnking the heating circuit

Hi,
When I built my car, I bypassed the heating circuit ,normally used to heat the inside of the car, with a loop: the water is just circulating in a hose running around the engine.
But as my engine bay is quite crowded, and I never found, in spite of many tries, the perfect route for the bypass hose, I'm thinking about just blanking the in and out ports of the heating circuit on the engine, with blanking plugs.
I have a Sierra 2.0i DOHC. the heating circuit runs from the water pump to the thermostat housing.
Will this be a problem? Does the heating circuit need to circulate, or can it be just blanked with no issue on the cooling system?
Thanks in advance for your advices.





Sylvain
http://vouchtroadster.blogspot.se/

View User's Profile Visit User's Homepage View All Posts By User U2U Member
CosKev3

posted on 11/3/18 at 06:09 PM Reply With Quote
It all depends if you have a circuit the coolant can take around the engine before the thermostat opens?
lots of engines the coolant circulates the engine then out around the heater matrix,a fast warm up circuit.

[Edited on 11/3/18 by CosKev3]

View User's Profile View All Posts By User U2U Member
snapper

posted on 12/3/18 at 06:34 AM Reply With Quote
Simple hose from manifold to pump running forward and round front off engine
I put a screw cap T piece in it as it will be highest ppl t of the system for bleeding.
The head can get hot spots if the out let is blocked





I eat to survive
I drink to forget
I breath to wee my ex wife off (and now my ex partner)

View User's Profile View All Posts By User U2U Member
Mr Whippy

posted on 12/3/18 at 07:14 AM Reply With Quote
quote:
Originally posted by snapper
Simple hose from manifold to pump running forward and round front off engine
I put a screw cap T piece in it as it will be highest ppl t of the system for bleeding.
The head can get hot spots if the out let is blocked



Everything above ^, can't imagine your engine bay is so crowded one small hose is a problem tbh, maybe it needs a review of the layout and a tidy up

View User's Profile Visit User's Homepage View All Posts By User U2U Member   Mr+Whippy 's Aim
CosKev3

posted on 12/3/18 at 07:59 AM Reply With Quote
So the two replies above confirm you can't just block it off!

Have you thought of having a hard pipe made up,then just two small rubber joining hoses onto engine?

View User's Profile View All Posts By User U2U Member
voucht

posted on 12/3/18 at 09:48 AM Reply With Quote
Thank you very much for your answers.

OK, I understand your points, and I won't block the heating circuit off, and keep the bypass.

As I said in my first post, I already have a bypass hose which is quite tidy I think: it is a piece of Formline hose connected to the engine with 2 silicone elbows, as the in and out ports of the heating circuit are on opposite sides of the engine, and both pointing outward!

The reason I wanted to remove the bypass is that I'm not happy with how it is set-up now, and I couldn't find a better way to route it.

The problem is on the intake side of my engine bay, which is very crowded, and what ever the route I try, this hose is always close to interfere with something: intake manifold that had to be shorten to fit under the bonnet, the other water hoses, the thermostat housing, the sensors (water temp, fan switch), the hose to the ISCV, the alternator, the belt to the crack pulley, or even the electric engine loom, etc.

But I'll find a way

Thanks again.





Sylvain
http://vouchtroadster.blogspot.se/

View User's Profile Visit User's Homepage View All Posts By User U2U Member
furryeggs

posted on 12/3/18 at 11:32 AM Reply With Quote
Not sure it the thermostat housing is the same as on a 2000 blacktop but in my tiger I have the heater and bypass ports blanked off. For a bypass you then drill a hole through the top of the thermostat (i drilled 3). This then allows water to circulate. This is what tiger do/recommended
View User's Profile View All Posts By User U2U Member
SPYDER

posted on 12/3/18 at 08:32 PM Reply With Quote
quote:
Originally posted by furryeggs
Not sure it the thermostat housing is the same as on a 2000 blacktop but in my tiger I have the heater and bypass ports blanked off. For a bypass you then drill a hole through the top of the thermostat (i drilled 3). This then allows water to circulate. This is what tiger do/recommended



The Toyota engine in my car had three "bypasses". One through the heater, one through an Oil/Water cooler and a third one which was only open when cold. As the thermostat opened the main cooling circuit it closed that one.
I duly blocked them all off and drilled several holes in the stat.
When the engine was cold you could see the top hose "pumping up" when the engine was revved. Once the stat was open the effect was less but still there.
Long story short, it blew off.
I have since fitted a remote stat with a proper bypass. As part of my current new engine build I plan to re-instate the oil/water cooler too.

View User's Profile Visit User's Homepage View All Posts By User U2U Member
killerferret666

posted on 14/3/18 at 08:55 AM Reply With Quote
quote:
Originally posted by CosKev3
It all depends if you have a circuit the coolant can take around the engine before the thermostat opens?
lots of engines the coolant circulates the engine then out around the heater matrix,a fast warm up circuit.

[Edited on 11/3/18 by CosKev3]


^^^^
This is all that matters!

1. Easiest check to get an idea of whether its safe is the original cars heating system / matrix. Many years ago they started to include a flow valve stopping water flow normally positioned in the main temperature unit within the cabin (its to stop heatsoak into the cabin when set to off), which meant only residual heat would pass into the pipes with no water flow. If this is in place it is controlled by the heating system controls and nothing to do with the engine which meant the engine would be fine with no water flow down these pipes. Meaning it has its own by pass pipes.

If the above is true blocking them off will cause no issues as the water not moving in that small bit of pipe would be the same as the heater valve closed at the other end of the pipe.

Heating systems are an add on for comfort for passenger not for the health / performance of an engine, the only difference for us is some of our engines are older so have to be checked. I had a modified Toyota supra at 450BHP when the heater matrix went I called the Tuners and they said blocking it up until I replaced the heater matrix was fine as the engines are designed to run at temperature with the minimum cooling occurring or they'd overheat when all cooling areas weren't turned on.

I'm actually looking into blocking mine up at the moment to ditch the weight of the pipes extra coolant and heavy heating aircon unit, probably drop a good 20kg overall I think





Building DDR GT4

Miami Gt4 Blog - Click Here

View User's Profile View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [ 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.