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 8V overcooling project

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Mbeach
Montanarolo
Montanarolo
Mbeach

Posts : 20
Join date : 2018-05-19

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PostSubject: Re: 8V overcooling project   8V overcooling project - Page 2 Icon_minitime1Fri Apr 19, 2019 10:52 am

What fitting did you use to adapt to the oil dipstick tube please?
Fluid control thermostats are cheap here (less than $50USD) at a number of places, $150 if you want an adjustable unit.
The cheapest unit bypasses the cooler circuit (10% flow) to 180F, then opens up full flow to the cooler. This would allow a quicker warmup for those with short commutes.
I’m all for trying (my bike has a whopping 550 miles on it) but I want to monitor the oil temp real time before I plumb in any hardware.
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OldMojo
Carlotto
Carlotto
OldMojo

Posts : 33
Join date : 2018-04-10

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PostSubject: Re: 8V overcooling project   8V overcooling project - Page 2 Icon_minitime1Sat Apr 20, 2019 8:53 am

Would someone be kind enough to temper my rank ignorance as to what problem is being addressed by this exercise?
I'm aware that EFI prefers consistent engine temps, which is harder to achieve with air cooling. Does overcooling cause the bikes to loiter in open loop or something?
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beetle
GRiSO Capo
GRiSO Capo
beetle

Posts : 6840
Join date : 2013-09-30

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PostSubject: Re: 8V overcooling project   8V overcooling project - Page 2 Icon_minitime1Sat Apr 20, 2019 2:50 pm


Simply put, during shorter runs and cooler weather, the oil/engine temperature doesn't get hot enough to prevent mayo development, and reduces fuel economy.

The former was never really an issue for myself, as I often used other methods to get the engine hot quickly in cooler weather, like blocking the air inlet to the oil cooler, and I never rode short distances. Since embiggening the engine, I've found the 1400 runs cooler than the 1200. It was frustrating my attempts to properly map the engine. Now, not only does the engine get up to "proper" operating temperature more quickly, it remains stable.

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Clancy
Biondino
Biondino
Clancy

Posts : 232
Join date : 2016-02-09

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PostSubject: Re: 8V overcooling project   8V overcooling project - Page 2 Icon_minitime1Sun Apr 21, 2019 6:18 pm

Mbeach wrote:
What fitting did you use to adapt to the oil dipstick tube please?

M20x1.5mm Male to 1/2" Female NPT
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Mbeach
Montanarolo
Montanarolo
Mbeach

Posts : 20
Join date : 2018-05-19

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PostSubject: Re: 8V overcooling project   8V overcooling project - Page 2 Icon_minitime1Sun Apr 21, 2019 6:39 pm

Thank you! My thread gauge was inadequate for the job.
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beetle
GRiSO Capo
GRiSO Capo
beetle

Posts : 6840
Join date : 2013-09-30

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PostSubject: Re: 8V overcooling project   8V overcooling project - Page 2 Icon_minitime1Sat Jul 06, 2019 1:41 am


An update. Yesterday, I incorporated a temperature sensor into the oil cooling line from the sump to the thermostat.

The oil temp stabilised around 100C. It never went above 105, and never below 98 on cruise. Once the engine temp stabilised at 107C, oil temp sat on 101-103 the whole time. Ambient temp was 17C.


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ghezzi
Fra Cristoforo
Fra Cristoforo
ghezzi

Posts : 2815
Join date : 2014-05-22
Age : 62

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PostSubject: Re: 8V overcooling project   8V overcooling project - Page 2 Icon_minitime1Sat Jul 06, 2019 2:47 am

Excellent!
Cooler bypass is something the factory should have included in initial development.
Cred given.
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ratso88
Grignapoco
Grignapoco
ratso88

Posts : 125
Join date : 2017-05-28
Age : 58

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PostSubject: Re: 8V overcooling project   8V overcooling project - Page 2 Icon_minitime1Sat Jul 06, 2019 4:08 pm

Beetle, thanks for the update. Since you originally posted on this project I've been thinking this thermostat is something I'd like to add. I don't ride the GRiSO in the winter, I have a Soviet sidecar rig for that, but I do like to get out on days when it's a bit cooler and still sunny. I hate it when I look at the indicated fuel consumption and it shows less than 30 mpg. With the oil temp sensor installed it seems to validate the project as being not exactly a requirement but at least strongly recommended.

I do appreciate your efforts and willingness to share information.  cheers
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