Apologies in advance, this is a double post from the proboards Quantum group.
I have an Oxford Blue Xtreme that I bought a couple of weeks back. It is running a bit hot at times (it is quite content up to 75mph continuous and just flying about but if i push on up to 85mph it will rise to 100 degrees and then struggle to come back down even with a decent cool down cruise. Running the fan manually only seems to do so much (it is blowing through correctly - not running backwards). The story so far is: -The expansion tank cap threads were tired and jumped so I have put a replacement bottle on. -The top rad hose was down to canvas in places with a couple of big cracks almost all the way through which I have replaced. -The heater was plumbed in copper heating pipe which looked to have been leaking at the joint with the rubber pipe. Replaced with silicone heater hose and proper clips. -I have added a fill point to the top radiator hose highest point so I can get the air out for definite. -If found that if I let it get really hot I can see the tiniest little bubble occasionally coming from a pin prick hole in the radiator top tank (needs repairing). Top of rad is slightly deformed near this pin hole where bleed screw (temp sensor hole?) looks to have been yanked on too hard to free it off. Otherwise rad is pretty good condition. -Next check is to check existence and condition of correct thermostat. -Mixture is overly rich at the mo (can see puffs of black smoke on part throttle occasionally on twin 40s) so it shouldn't be that. Trying to get it dynoed / set-up once cooling is behaving. -Ignition timing has vacuum capped off so need to check timing is ball park with a strobe. -Check calibration on temp gauge in case it is lying. -After that I was going to put a bit more cooling through bonnet by cutting some nice holes in it (it has 5 round holes probably 1" or so in there already. It gets really hot under the bonnet. Spoke to quantum about just buying a new radiator but they dont do them anymore? Design has changed on newer cars post 2010 and old one isn't available. I am assuming the stock system of quantum radiator on a fairly mild 2.0 pinto should be man enough for the job. So the questions are: -Does anyone know if the quantum rad is an out-and-out special or does it come from somewhere else (it is donor sierra according to the list). -Are there any obvious mods to get more air moving over it (ducts and holes etc). I have seen on the v8 xtreme thread that Chris is running the radiator upright where mine is laid back against the chassis at an angle -Is there a more modern alternative rad. -Is getting rid of under bonnet heat more relevant as big SPAL fan is ultimately blowing a lot of the heat under the bonnet. -What sort of ignition advance do you run on a 2.0 pinto with a mild cam and no vacuum advance. Loads of questions!!I am not expecting it to able to sit for hours on the M25 with the engine running but I was figuring I should be able to do 85mph at 20 degrees air temp. Simon Read more: http://quantumforum.proboards.com/thread/953/new-xtreme-owner#ixzz3ABR56os2 -- -- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/quantumowners?hl=en IMPORTANT NOTE: All information presented herewith is provided on an "As Is" basis, without warranty or the implication thereof. Neither the Quantum Owners Club nor the individuals associated with the Quantum Owners Club or in the preparation of the above information shall have any liability to any person or entity with respect to liability, loss, or damage caused or alleged to be caused directly or indirectly by the instructions contained within this or related message(s). --- You received this message because you are subscribed to the Google Groups "Quantum Owners Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
