Heat Riser Replacements

Those "heater blankets' that wrap around the manifold- how effective are they? I've got a single carb, TP manifold that needs warming - should i use two 'blankets'? On on each side of the vertical intack tube?

Cheers

why does it need warming??? (besides it is cold)

Your heat risers "should" provide enough heat. It works well in Europe and USE so it should in Melbourne.

Are they clean??
Are they connected??
Are you running a stock exhaust or extractors???

Personally i cant believe a 12 V system will put enough heat to warm a manifold - but a few people use them so ...... 😀

i have this problem on really cold mornings....the top of my manifold ices up and my 1600 sp wont idle. my heat risers are connected though i have extractors. only the top bit ices up where the manifold bends in towards the car. how much are these things and where do u get them?

Nick

http://www.bigboyztoys.co.uk/news/index.php?m=200311

Product Details
Aircooled parts and accessories:Custom electrical parts


I.M.D.U.

The IMDU ( Inlet Manifold De-icing Unit ) is a revolutionary
product that is sweeping the world. Regardless of whether you
suffer from icing or not, the neck of your manifold always runs at a
cooler temperature, and will not give optimum performance. The
IMDU alleviates this by regulating it's own temperature & uses a
current of only 1.8 amps (equivalent to a side-lamp bulb). It fits
most 1200cc to 1600cc air-cooled engines in 6v or 12v form as
well as an extra-long type for vehicles with twin choke webbers.


Price - 29.95 GBP


1.8 amps x 12 volts = 21.6 Watts
I dont think that will warm a gnat's nuts!

[Edited on 17-8-2004 by blue74l]

might be just enough to stop the ice forming.....

put your hand on a 20W light bulb and tell me if you burn yourself??

Save your money and just breath over your manifold before starting it. You will get more heat.

:thumb

you may gather i am not a believer :jesus

check the pre heat tubes to see if there block and get a new mainfold if so.

check the pre heat tubes to see if there blocked and get a new mainfold if so.

I've heard from a few posts here before, that they aren't really effective as they dont generate enough heat... but then I've heard that they work too...

I'm going to be running Genie extractors and the heat riser outlets have been welded up. I could drill them out, but the single carb, TP manifold i have has a large crack running nearly the length of the metal surrounding the manifold and riser tubes (the softer lighter coloured metal). So I am sussing out my options...

a> drill out the outlets and get a new manifold
b> go with the heater blanket

Anthiron wrote:i have this problem on really cold mornings....the top of my manifold ices up and my 1600 sp wont idle. my heat risers are connected though i have extractors. only the top bit ices up where the manifold bends in towards the car. how much are these things and where do u get them?

Nick

I think AVWPC in Melb sells em for abotu $35... i know that's not much help when you're in Brisy

Be aware the a extractor doesnt pump the exhaust through like a stock exhaust does. An extractor set has takes off at exh ports 2 and 4

A stock has one at 2 ( or is it 4) and the other is actually joined at the collector inside the exhaust.

An extractor just pulses the gas back and forth.
A stock exhaust flows it through the heater tubes.

You can/could modify the extractors but the pulse is better than nothin ( and nothin is better than a IMDU :kiss )

NEW manifolds are nor cheap.

I would keep my eye out for a good second hand one and clean the tubes really well.
You can buy replacement tube.

As for the crack - i would just put a hose clamp around the tubes and join it that way

I think the crack leaks exhaust as well, I was cleaning it out with turps and it was dripping from the crack...

If it is cracked and leaks it is fooked.

Test with water or air.

If not hose clamps would suffice till a better one was found

bugga... cant weld it up can ya? I suppose the weld material would be totally different from the surrounding stuff..

If you have a Stockie go with the heater tube and get a new mainfold