Zac, You're right, it's definitely much safer to undo the cap cold and let it warm up that way.
Haven't some L20B's got a bypass hose coming out from underneath the thermostat housing. This could be the problem if Mick has one and it's connected to the water pump. I seem to recall seeing this sort of bypass on my mum's Bluey, I know it was quite different to the L16/L18 bypass. I would say that anything under 170F is too cool. The stock 1600 (70+) gauge has a fairly narrow band, the first line is ~165F, the first vertical line which is the start of the normal range is 170F, the mid line left of the E is 180F, just left of the P is 190F and the start of the red is ~205F which is a guestimate as I did the test with a 192F thermostat so it never got up to the red. It roughly indicates around ~10F for every 1/4" so to answer your question IMHO the T is ~175F so it's not too cold. regards Terry -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Zac Campbell Sent: Thursday, 31 January 2002 11:54 PM To: [EMAIL PROTECTED] Subject: Re: Radiators/UNDERheating// 2 I will agree with Terry about his locations of the Celsius markings on the stock gauge. Terry when you suggested he take the cap off while the engine is running, maybe he should do it when the engine is stone cold, then start the engine - wait until it gets up to temperature and when the thermostat opens you will see the coolant start flowing into the radiator. If it is flowing from the start then the thermostat could be stuck open a tad (or of course he could have a hose of sometype bypassing the thermostat). But Terry, going back to your earlier comment about an engine running too cool, is it possible to put a point on what too cool is? With the thermo fans and switch I have my engine very rarely gets above 85C and if cruising on no load it gets down to the start of the T sometimes.. too cold? cheers, zac ----- Original Message ----- From: Terry Rudd <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, January 31, 2002 10:54 PM Subject: RE: Radiators/UNDERheating// 2 > Mick, > > Working out how your engine is running cool whilst on the move gets a bit > tricky now. Logically to me you have to have either water circulating > through the radiator with the thermostat shut somehow - the heat has to be > exchanged into the atmosphere somehow especially as it warms up when you're > stopped i.e. no airflow. > > Have you got a heater fitted? > How are the bypass hoses connected or are they blocked off which is the > normal thing with weber manifolds? > > It doesn't make a lot of sense to me and I'm not too sure what we do from > this point, as you know my rad is very similar to yours and i've never > experienced anything like this except when a thermostat has jammed open. I'd > carefully crack the cap when the engine is running and have a look see > what's going on inside the radiator, it's very evident if water is > circulating when the thermostat should be shut. For info 88 degrees on a > stock gauge is towards the end of the M start of the P region, stock 82 > degrees is just to the left of the E. What about pressure? none/some/normal? > > This post is a bit like yours too, more questions than answers - the way it > goes when trouble shooting I spose. > > regards > Terry > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED]]On Behalf Of mick ralph > Sent: Wednesday, 30 January 2002 11:21 PM > To: [EMAIL PROTECTED] > Subject: Re: Radiators/UNDERheating// 2 > > > Hi Terry > Good to hear you had a decent break over xmas.. And glad to see you back and > active here..hehe I have some more information about this thread.. I checked > the thermostat today and sure enough it isn't fully closing. I had another > one here the same so i tested it and it was fine so I chucked it in. I also > set the Webers up a bit better,,, Then go for a run on the motorway and sure > enough the temp DIDN"T go up..just stayed on the stop ie 0 ... Come off the > motorway and sit at traffic lights and straight away the temp starts to go > up and sits steady at "E",, As soon as i go back on the motorway the temp > drops down to zero again. So I get off the motorway and by the time I'm in > my driveway the gauge is up to "E" again.. > So > 1. The thermostat is tested and works @ 88 degrees. > 2. The gauge seems to be ok > 3 The engine feels a bit different ie down on power and unhappy > 4. The engine is hot to the touch after such thrashing but the radiator is > just warm > I can see how a thermostat would cop a hiding in these circs and the one i > tossed is less than 12mths old. > Should i just try a test with half the radiator blocked off? Not my > preferred option but easy to test.. Or remove the fan blades (tempting but > harder) > If the temp became more 'normal' you would have to say that its 'over > radiatored' wouldn't u? > The big question is what effect is this gonna have in a sprint situation > where often getting enough heat into engines, brakes and tyres is the major > problem? > Sorry for all the questions and thanks in advance. > cheers > Mick > > www.datsun1600.freeservers.com > > > --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[email protected]/ ---------------------------------------------------------------------
