gregf27
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| posted on 18/11/05 at 10:04 PM |
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vx redtop plumbing mod
I have seen on another site , that if you dont run a heater on the vx redtop engine , there is a little mod that involves removing the coolant tube at
the rear of the cylinder head with a pair of molegrips, and then thread the hole with a 1/2" BSP tapered tap, and then get a tapered brass plug
from a plumbers merchants and use plumbers tape or threadlock to make a good seal.
I have just returned from my garage , having removed the said coolant pipe, but the diameter of the hole looks wider than 1/2", can anyone
confirm the 1/2" BSP tapered tap is the correct one???
Before I go to the plumbers tomorrow!!
thanks in advance.
Greg
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Chippy
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| posted on 18/11/05 at 10:36 PM |
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May be getting the wrong end of the stick, but why not just cap off the existing pipe ?
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Ben_Copeland
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| posted on 18/11/05 at 10:49 PM |
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Cos it looks neater than capping. Sorry can't remember the size of the plug.
Ben
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Cazzy R
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| posted on 19/11/05 at 12:05 AM |
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Pipe threads are a little confusing! 1/2" BSP does not refer to the dia of the threaded portion, like a bolt, but the nomonal bore size of pipe
that particular size of connection can accomodate.
So in a nutshell the threaded portion will actally measure significantly larger than 1/2". A bit of Googling will probably find the necesssary
measurements.
Cazzy R
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trikerneil
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| posted on 19/11/05 at 06:33 AM |
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Tapping size for 1/2 BSP is 0.750" (19.05mm)
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ned
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| posted on 19/11/05 at 10:01 AM |
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iirc its not threaded to start with, its a push in fitting for the heater output, so just turn down some ally plate to size and knock it in with some
thread lock and it'll be fine, we've done this on race engines numerous times, its no different to fitting a core plug.
Ned.
beware, I've got yellow skin
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NS Dev
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| posted on 19/11/05 at 02:58 PM |
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............but there are some that say it is not a good idea to cap it off anyway as it restricts coolant flow to the rear of the head..........SBD
suggest it's not a good idea, and while I don;t necessarily think that he knows everything there is to know he does know more than me about XE
plumbing!
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gregf27
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| posted on 19/11/05 at 04:09 PM |
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Thanks for all the replies guys, I went to the local plumbers merchants today , who boast they have a huge variety of fittings, and guess what? - no
joy at all!!
I guess I'll keep on looking!!
cheers and beers, Greg
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martthefridgeman
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| posted on 19/11/05 at 04:23 PM |
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vx plumbing
had the same problem my self. in the end my son came up with a good solution that also looks tidy. on the water pump of a peugeot 405 xu9 engine there
is a rubber blanking cap that was perfect for the job and was also easily available from my local dealer
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ned
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| posted on 19/11/05 at 05:58 PM |
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quote:
Originally posted by NS Dev
............but there are some that say it is not a good idea to cap it off anyway as it restricts coolant flow to the rear of the head..........SBD
suggest it's not a good idea, and while I don;t necessarily think that he knows everything there is to know he does know more than me about XE
plumbing!
It is supposedly the case that blanking the heater output can create a 'hotspot' in the head, though I'm not sure I'm worried
about it, I've seen many race engines, including swindons iirc that just blank the output. Race engines don't run for as long admittantly,
but run with far higher stresses as they run full duty cycle for want of a better phrase ie flatout for the duration of the race and we often saw over
the rev limit on down shifts upto about 8.2k! We've also boiled an engine or two such as loosing a coolant hose round thruxton and getting the
wet and dry in the bores on the drill to get back out for the race the following day after! And what damage is a little heat in the head going to do?
The cylinder is the most sensitive part to heat imho a lot of the time.
Ned.
beware, I've got yellow skin
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Stu16v
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| posted on 19/11/05 at 06:19 PM |
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Greg, just use a core plug...
Dont just build it.....make it!
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mitch2b
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| posted on 19/11/05 at 08:39 PM |
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Hi Greg
Friend of mine has done a write up on his website,
http://nw.rhocar.org/engineswop.htm
Its a robin hood but may be of help to others too
Mitch
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gregf27
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 posted on 21/11/05 at 08:38 PM |
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Got hold of a 1/2" BSP tapered tap for £5 from e-bay, and bought a brass tapered plug for 99p from Pipeline merchants in Shrewsbury -
Result!!
just fabricated myself a tap wrench for it this evening in my garage!!!!
will let you know if it works out!
thanks again for all the help, Greg
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