> Thanks Bobby
>
> I read a post from way back from Lynn E. Hanover whom I understood was well worth listening too.
> He didn’t mention any need for the hole between inlet and outlet.
> He did however talk about making sure the outlet was restricted compared to the inlet to prevent pump cavitation.
> He mentioned that he uses a 5/8” restriction, however that all systems are different and depend upon rad resistance and plumbing etc.
> I’ll experiment a little and see what happens.
>
> Cheers
>
> Steve

> On 27 Dec 2017, at 9:44 pm, Bobby J. Hughes bhughes@qnsi.net <flyrotary@lancaironline.net> wrote:
>
> Steve,
>
> My thermostat hole is plugged and have a #30 hole drilled through the plug.
>
> Bobby
>
> Sent from my iPad
>
>> On Dec 26, 2017, at 9:18 PM, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
>>
>> Merry Christmas to all
>>
>> I’m still troubleshooting our cooling system.
>> Renesis 4 port in Glasair Super II RG
>>
>> We removed the thermostat, and plugged the whole between the in and out circuit with a threaded plug.
>> I think I read someone saying there should be a hole in that plug, which I take it was to let air our of the inlet side of the pump.
>> On a picture of the front housing I think I can see a hole in the top of the pump impeller housing that might perform this function.
>> Can anyone comment?
>>
>> Thanks
>>
>> Steve Izett
>> Perth Western Australia
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