| [ Total Views: 790 | Total Replies: 15 | Thread Id: 65727 ] |
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 darrinc
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| posted on October 22nd, 2007 at 09:32 PM |
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should these be blocked off???
thanks again everyone for the previous info ,but i am back again,from what i can find out i have a 65/66 type 1 with a 1300 motor.what my question is
after looking at the motor i have noticed that on either side of the engine are two metal ducts (pipe looking things) that have what i can best
describe as something that looks like caps slide up over them and held on with hose clamps are they supposed to be blocked of as some motors i have
seen have rubber hoses running from them to some sort of hole in the engine floor going to something ????
i am just concerned about over heating but by the looks of it they have been like this for years???? any ideas?
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Pumba
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| posted on October 22nd, 2007 at 09:44 PM |
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If your car has extractors fitted you lose the two tubes that run down to the standard exhaust,so then most people block the two outlets with caps and
hose witch is your heater cheers shane.
69 Beetle
66 Beetle
56 Beetle
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Craig Torrens
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| posted on October 22nd, 2007 at 09:45 PM |
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without explaining, all is fine. (there will be no probs with overheating!)
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shaihulud
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| posted on October 22nd, 2007 at 11:38 PM |
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If you want to have a heater and you have heater boxes on your exhaust pipes, connect the outlets on the cooling fan shroud to the heater boxes with
corrugated paper/aluminium tubes. If you don't want to have a heater, block off the outlets as if they are left open then air which could cool the
engine will go out of them to waste. In winter that would'nt matter. In summer it could matter.
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Joel
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| posted on October 23rd, 2007 at 05:24 PM |
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jake raby did some testing a few years ago and found out its just as bad to cap them off as it is the leave them open
capping them off interupted the flow in the fan housing which lead to head temps going up
the correct thing to do was cap them off but put a hole in the plug about 1" which simulated the same restriction as a heater box
the actual results are on paper on his website so no im not pulling that out of my arse
-Joel
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ancientbugger
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| posted on October 23rd, 2007 at 05:42 PM |
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Joel, if you have the heaters all connected and working and you have them turned off no air would be running past the heat exchangers because they
would be blocked at the flaps. But as you should only be using your heaters when it's cold (duh!) the loss of cold air would possibly be made up as
the air cooling the engine would that much cooler than during summer. Look this makes sense to me honestly. Bollocks I've just read Shaihuluds post
and he put it better than me
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Joel
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| posted on October 23rd, 2007 at 06:21 PM |
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nah if u have a close look at the heater boxes they have a by pass valve thing at the back
when the main flap shuts it pumps the air out these
otherwise the heaterboxes would turn into giant ovens and nuke the heads
not trying to be a smart arse but my old boss at the garage was head of the service department of lismore dealership and explained all this to me
plus the original thermostat flaps was what regulated air flow when cold
if anyone has heaterboxes on there car dont remove the hoses
the heaterboxes need air pumped thro them when not in use otherwise they well get really hot and start to overheat the heads
if u have fumes coming into ur cabin instead of removing the fan housing hoses just remove the hoses that go from the heaterboxes to the
heaterchannels either side of the gearbox instead
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ancientbugger
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| posted on October 24th, 2007 at 03:26 PM |
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Well, in the words of Stan Marsh, "I've learned something today!"
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68AutoBug
A.k.a.: Lee Noonan
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| posted on October 24th, 2007 at 06:28 PM |
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Well
I've Never read anything like that before either...
but I have seen the small hole in heater boxes that allow air to flow thru them all the time...
So, I've learnt something New too...
I would have said to keep the vents blocked off...
I run heater boxes
but If I didn't, like Many Many VW owners
I would use the 50mm Welch plugs to block the holes up
as I don't like any air leaks....
Lee
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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MickH
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| posted on October 24th, 2007 at 08:16 PM |
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I say block the suckers !!!! Always have and always will.....and never had a problem...
tssnq.com.au
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Joel
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| posted on October 24th, 2007 at 10:03 PM |
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i just had a look its a 1.5" hole in the plugs for optimal airflow
quote from jake rabys site:
the air was to be metered by the heater boxes and the shroud was designed with this amount of bleed and back pressure in mind. I found that a freeze
plug with a 1.5" hole in the center provided effectively about the same results as with heaterboxes installed, pressure wise within the shroud....
Remember that even when the heat is off, the air escapes from the heaterboxes through the tiny bleeders on top of them, there is always air escaping
from those "snorkels" on the stock shroud, with the original design.
The same rule has applied to the TIV engine with the heater boxes removed- blocking the outlets in the stock shroud certainly has negative results-
mine have been open on the Bus for 5 years. Blocking them off quickly elevates temperature differences and really heats up the #1 cylinder...
_________________
Jake Raby
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MickH
A.k.a.: Michael Hutchinson
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| posted on October 24th, 2007 at 10:28 PM |
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| Quote: | Originally
posted by DUB74L
i just had a look its a 1.5" hole in the plugs for optimal airflow
quote from jake rabys site:
the air was to be metered by the heater boxes and the shroud was designed with this amount of bleed and back pressure in mind. I found that a freeze
plug with a 1.5" hole in the center provided effectively about the same results as with heaterboxes installed, pressure wise within the shroud....
Remember that even when the heat is off, the air escapes from the heaterboxes through the tiny bleeders on top of them, there is always air escaping
from those "snorkels" on the stock shroud, with the original design.
The same rule has applied to the TIV engine with the heater boxes removed- blocking the outlets in the stock shroud certainly has negative results-
mine have been open on the Bus for 5 years. Blocking them off quickly elevates temperature differences and really heats up the #1 cylinder...
_________________
Jake Raby
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If you seriously believe that "with the heater boxes removed",preventing cooling air from escaping through holes in the shroud will cause your
engine to run hotter because there is more air cooling it...then believe what you will. The problem with blocking the air when the heat exchangers are
still present is the extra heat sink to the heads from a hotter than normal exhaust when the engine is stopped,as there is no airflow past the
extractor to cool it down.This problem would relate to the Type4 engine rather than the "upright" engine due to the exhaust being mounted inside the
head area. I've thrashed this out on Shoptalk etc and am yet to be convinced otherwise. Jake does good work,don't get me wrong, but sometimes it's
best to decide for yourself and not just take one persons opinion. Also bear in mind their climate is a little different to ours.....
tssnq.com.au
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MickH
A.k.a.: Michael Hutchinson
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| posted on October 24th, 2007 at 10:35 PM |
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HeHe...block them off and run a power pulley
tssnq.com.au
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Joel
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| posted on October 24th, 2007 at 11:52 PM |
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yeah lol
i only beleive in it cos ive seen test results
but ive also seen a cut open fan shroud and the 2 heater outlets are at the dead end of outer ducting so the air doesnt continue past them to the fins
so i cant see it disturbing the flow as much as suggested
and yes whilst i did bring up the holes in the plugs im currently running 1 7/8 welsh plugs in mine with none only cos im to lazy to put holes thro
them
i dont have a CHT gauge but ive noticed no real diffence yet
but yea i can certainly see how running the heaterboxes with no air flow thro them would heat up the heads
specially the older ones with the alloy fins inside
-Joel
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ancientbugger
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| posted on October 25th, 2007 at 07:48 PM |
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I suppose if you have heaters why not use them as VW intended. My cab has heaters and has all the parts intact- even the thermostat. The buggy on the
other hand has never had heat exchangers fitted and so the outlets have never been left open, I've always believed the more cooling air the better
and now nearly twenty years down the track the buggy has never overheated!!
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Craig Torrens
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| posted on October 25th, 2007 at 09:21 PM |
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I have a CHT........................block them off 
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