zeberdee
Club Retro Rides Member
Posts: 1,042 
Club RR Member Number: 2
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The 1957 "The Dope" Dauphine zeberdee
@zeberdee
Club Retro Rides Member 2
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Definitely try a cooler stat .
Had the same issue on my brother’s Bedford CA after an engine rebuild .
He fitted a 84 c stat , thinking that’ll be right . Had all the same kinda issues with heat .
In the end i think he changed to a 74 ish , ran alot better .
Think older systems need a cooler stat compared to modern stuff , as has already been said .
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Last Edit: Jul 22, 2020 7:32:06 GMT by zeberdee
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Darkspeed
Club Retro Rides Member
Posts: 4,883
Club RR Member Number: 39
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The 1957 "The Dope" Dauphine Darkspeed
@darkspeed
Club Retro Rides Member 39
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Jul 22, 2020 12:19:58 GMT
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It looks to me like your expansion bottle is just a large radiator bypass. Make up a bung with 4mm hole drilled in it and insert into the hose that runs from the top of the head to the tank.
ETA
You probably have a 120 Watt motor on that fan which is 0.16 BHP - The Hillman Imp - rear rad layout - required 7BHP to run the fan to cool the engine sufficiently - Electric work fine for front engines where the fan is not really required when the car is moving - Rear engines need a lot of fan power to shift air all the time and more and more power the faster the car goes whereas a front rad car needs less and less/none.
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Last Edit: Jul 22, 2020 12:52:45 GMT by Darkspeed
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Adey
Posted a lot
Posts: 1,442
Club RR Member Number: 171
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The 1957 "The Dope" Dauphine Adey
@adey1984
Club Retro Rides Member 171
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Jul 22, 2020 12:37:55 GMT
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It looks to me like your expansion bottle is just a large radiator bypass. Make up a bung with 4mm hole drilled in it and insert into the hose that runs from the top of the head to the tank. from what i can tell the hoses would normally run through the header and heater matrix but every renault seems to be different. ill give it a try |
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Jul 22, 2020 12:45:21 GMT
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When I finally got the Viva back on the road we had gone over to unleaded fuel and the engine ran much hotter to the point where the exhaust melted the steering rack boot, don't know if unleaded fuel burns hotter?
I only use Tetra boost fuel additive which seems to help my temperature issues
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Darkspeed
Club Retro Rides Member
Posts: 4,883
Club RR Member Number: 39
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The 1957 "The Dope" Dauphine Darkspeed
@darkspeed
Club Retro Rides Member 39
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Jul 22, 2020 13:01:15 GMT
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from what i can tell the hoses would normally run through the header and heater matrix but every renault seems to be different. ill give it a try It's about pressure differentials - there would be a faily large resistance to flow through hoses and a heater matrix etc. You have that tank with a low resistance to flow across the largest pressure differential - the head outlet and pump suction. Water will just follow the path of least resistance. If you put a resistance in the flow through the tank - there should really be no flow at all through it - the water will have no option but go through the rad to be cooled. At present it looks like you are just putting water from the very hottest part of the engine back into the pump to get heated even more ! If not a bung - just clamp it closed and go for a run. ETA also see note above about fan power requirements |
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Last Edit: Jul 22, 2020 13:09:01 GMT by Darkspeed
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Adey
Posted a lot
Posts: 1,442
Club RR Member Number: 171
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The 1957 "The Dope" Dauphine Adey
@adey1984
Club Retro Rides Member 171
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Jul 22, 2020 13:23:44 GMT
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good info, will rig something up now, cheers
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mat88
Yorkshire and The Humber
Posts: 1,542
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Jul 22, 2020 13:53:52 GMT
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Just read this start to finish.. what a cool little car (I'd never heard of one before, il blame my age and ignorance haha)
On the temperature issue the location of the sender makes a massive difference.. we've just had a similar (but different) issue on some trucks at work..
Using my little Infra red gun I could get 25 degrees difference on temp depending where I checked (the gun is accurate to within a degree even in air).. once yours arrives it will give you a lot clearer pic of what's happening
Bookmarked.
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Adey
Posted a lot
Posts: 1,442
Club RR Member Number: 171
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The 1957 "The Dope" Dauphine Adey
@adey1984
Club Retro Rides Member 171
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Jul 22, 2020 14:09:32 GMT
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Cheers man, hopefully its all actually running fine just the dash is no where near where i think it should be. As you said once i can check it properly ill have a clearer picture.
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Adey
Posted a lot
Posts: 1,442
Club RR Member Number: 171
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The 1957 "The Dope" Dauphine Adey
@adey1984
Club Retro Rides Member 171
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Jul 22, 2020 14:16:46 GMT
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So i have today, fitted a bigger scoop underneath, fitted all the engine cowling and on the dash it shows no different when running down the road. So its either ok or overheating but i don't know which lol. Its good to have it all in to hopefully improve the efficiency of it all but I'm really clutching at straws until the other stat and temp probe turn up and i can check things properly.
As i side note i fitted a 6mm (smallest i could find) restriction in the hose to the header tank which made no difference on the gauge so i then clamped the hose closed and drove and again made no difference to the dash running temperature. I will leave the restrictor fitted to limit flow to the header tank as suggested.
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Last Edit: Jul 22, 2020 14:17:53 GMT by Adey
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The 1957 "The Dope" Dauphine peteh1969
@peteh1969
Club Retro Rides Member 107
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Jul 22, 2020 14:22:20 GMT
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Did you fit some mesh to the scoop to stop any nasty's from being ingested into the rad as your driving?
Personally I would a fully interdependent temp gauge and sender so it does not use any of the car electrics other than a power feed.
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Adey
Posted a lot
Posts: 1,442
Club RR Member Number: 171
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The 1957 "The Dope" Dauphine Adey
@adey1984
Club Retro Rides Member 171
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Jul 22, 2020 14:27:44 GMT
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Did you fit some mesh to the scoop to stop any nasty's from being ingested into the rad as your driving? Personally I would a fully interdependent temp gauge and sender so it does not use any of the car electrics other than a power feed. no i havent, the original doesnt have any, all ive done is extend that about an inch lower than before. not sure if theres a way i could rig something up for that, the radiator is a fair bit above the scoop. Ill keep an eye on it if i ever get it running well enough to use  |
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drseg
Part of things
Posts: 142
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Jul 22, 2020 22:49:35 GMT
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when its supposed to be 100 deg c can you touch the rubber hoses? if you can it aint 100 deg
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Adey
Posted a lot
Posts: 1,442
Club RR Member Number: 171
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The 1957 "The Dope" Dauphine Adey
@adey1984
Club Retro Rides Member 171
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Jul 23, 2020 13:34:07 GMT
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when its supposed to be 100 deg c can you touch the rubber hoses? if you can it aint 100 deg I cant touch it before the fan comes on at 92c so its definitely that hot at least, and hotter when driving. Just don't know how much hotter lol. No deliveries today so no thermostat or temperature gun yet. |
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Adey
Posted a lot
Posts: 1,442
Club RR Member Number: 171
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The 1957 "The Dope" Dauphine Adey
@adey1984
Club Retro Rides Member 171
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Jul 23, 2020 18:30:08 GMT
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thermostat turned up about an hour ago, so i tested it a pan to make sure it worked then fitted it. When driving from cold the temp seemed to stay in check for longer but once the heat set in its definitely running above 92c all the time.
I did have a chat with a friend who makes aftermarket rads and intercoolers who said that my rad was pretty cheap but wasn't sure if in his opinion it was an airflow issue or radiator design issue. He has offered to sort me an aluminium rad but id rather deduce what the actual issue is before jumping in with something bigger that could just be masking another issue or might not help at all.
So on my list is a cooling issue/rad/airflow or an engine issue/hg/crack somewhere i guess? a few in the know have said i shouldn't have an issue running it the way i am as I'm running a near standard r8 engine. They did have mechanical fans though.
Still awaiting the temp probe and the temperature gauge so still just guessing currently.
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Last Edit: Jul 23, 2020 18:51:29 GMT by Adey
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Jul 23, 2020 23:00:02 GMT
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I've had a nosey through your pics and the temperature sensor faces the radiator it might be getting warmer than it should giving you a false reading
maybe try covering the sensor with a heat shield
another thing you could try is remove the engine lid and go for a drive and see if it has any effect of the temperature could indicate air flow issues
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Paul Y
Posted a lot
Posts: 1,951
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Jul 24, 2020 14:01:07 GMT
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Ah, the Roadkill fix all. Remove the bonnet. You have proved yourself to be fairly methodical so sure you will get it resolved. P. |
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Adey
Posted a lot
Posts: 1,442
Club RR Member Number: 171
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The 1957 "The Dope" Dauphine Adey
@adey1984
Club Retro Rides Member 171
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Jul 24, 2020 14:15:43 GMT
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Ah, the Roadkill fix all. Remove the bonnet. You have proved yourself to be fairly methodical so sure you will get it resolved. P. Ha i haven't got that extreme yet. I have jacked the bootlid with a couple of bolts like the old school racers did, not really tried it yet though. |
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