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Re: Megabusa cooling issues
by yosamitesam
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--- In bike-engined-cars@..., "steve169548" <steven.lawson@...> wrote:
>
> I have built a Megabusa and have covered approx 300 miles in now and seem to be having cooling issues.
>
> I have used the SBD/Nova Racing dry sump which means I have to run a electric water pump as the scavenge pump is driven from the original water pump take off.
>
> Initially I was using the Westfield supplied VDO sensors with the Race Technology Digidash but had really odd readings for oil pressure,water temp and fuel level.This turned out to be the calibration file supplied by Westfield(they admitted it was mainly guesswork!!)
>
> I have now swapped over to the Race Technology recommended Bosch sensors and it seems a lot better.
> I used the car on Saturday and went round the M25 to Cobham Proving Ground (a 30 mile trip) and whilst I was on the motorway the temps crept up to 113 degs.This was just cruising at 70 mph and pulling 6000 rpm.
> I have swopped the cooling fan switch for one that comes on at a lower temperature and have been all round the car witha infrared temp gun trying to check to see if I really am seeing such high temps but obviously I am only measuring the temp of the component not the actual coolant level.
>
> In all this checking/testing the car has not boiled over ever,the highest oil temp has never exceeded 100 degs.
>
> I am at a loss what to do next other than spend even more money and get the RadTec radiator they make which is a direct replacement for ther existing Polo rad.
>
> Just to add some more info I was using the Davies Craig Digital water pump controller but have bypassed this now and the pump is running constantly.
>
> Any suggestions please as I have a driving day booked at North Weald on July 10th.
>
> Thanks
>
> Steve
>
you could try using a digital multimeter with a temp probe - i bought one from machine mart - the probe is just a very thin wire - then shove the wire under the top rad hose - see what its really doing.. can survive temps well in excess of 300 degrees or more just dont put it in a naked flame!
my megabusa never seems to go much above 70 deg or so even if being enthusiastic :o)
>
> I have built a Megabusa and have covered approx 300 miles in now and seem to be having cooling issues.
>
> I have used the SBD/Nova Racing dry sump which means I have to run a electric water pump as the scavenge pump is driven from the original water pump take off.
>
> Initially I was using the Westfield supplied VDO sensors with the Race Technology Digidash but had really odd readings for oil pressure,water temp and fuel level.This turned out to be the calibration file supplied by Westfield(they admitted it was mainly guesswork!!)
>
> I have now swapped over to the Race Technology recommended Bosch sensors and it seems a lot better.
> I used the car on Saturday and went round the M25 to Cobham Proving Ground (a 30 mile trip) and whilst I was on the motorway the temps crept up to 113 degs.This was just cruising at 70 mph and pulling 6000 rpm.
> I have swopped the cooling fan switch for one that comes on at a lower temperature and have been all round the car witha infrared temp gun trying to check to see if I really am seeing such high temps but obviously I am only measuring the temp of the component not the actual coolant level.
>
> In all this checking/testing the car has not boiled over ever,the highest oil temp has never exceeded 100 degs.
>
> I am at a loss what to do next other than spend even more money and get the RadTec radiator they make which is a direct replacement for ther existing Polo rad.
>
> Just to add some more info I was using the Davies Craig Digital water pump controller but have bypassed this now and the pump is running constantly.
>
> Any suggestions please as I have a driving day booked at North Weald on July 10th.
>
> Thanks
>
> Steve
>
you could try using a digital multimeter with a temp probe - i bought one from machine mart - the probe is just a very thin wire - then shove the wire under the top rad hose - see what its really doing.. can survive temps well in excess of 300 degrees or more just dont put it in a naked flame!
my megabusa never seems to go much above 70 deg or so even if being enthusiastic :o)
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