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peterz(at)zutrasoft.com
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 Posted: Mon Jan 02, 2023 1:02 pm Post subject: 912ULS classic radiator cap pressure? |
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Mine has 0.9bar stamped on it, and appears to start blowing when cht is around 220.
I either simply need a new one, or one of a higher pressure? I see discussion about 1.2bar being standard?
No idea why mine has a 0.9bar.
Cheers and thx,
PeteZ
C-GNPZ
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JonathanMilbank
Joined: 14 Apr 2012
Posts: 384
Location: Aberdeen area
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| Posted: Mon Jan 02, 2023 4:03 pm Post subject: Re: 912ULS classic radiator cap pressure? |
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Many, many years ago it was advised to change from 0.9 to 1.2 bar. A friend gave me a spare, which he bought from an online motorcycle shop, which I think was intended for a water cooled Triumph? motorbike. Anyway it's smaller than those found on car radiators.
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Area-51
Joined: 03 May 2021
Posts: 372
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| Posted: Mon Jan 02, 2023 8:09 pm Post subject: Re: 912ULS classic radiator cap pressure? |
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Higher pressure raises boiling point of the coolant; earlier 912 had the lower pressure cap... Have both the cap and coolant system pressure tested; 1.2bar is not a big increase and the standard system in good condition can tolerate 1.2bar.
If the cap holds 0.9bar and you have overheating issues its highly likely you have another issue.
The small toyota/jap style recovery reservoir caps do not fit; are slightly larger diameter than the rotax ones.
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budyerly@msn.com
Joined: 05 Oct 2019
Posts: 282
Location: Florida USA
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| Posted: Mon Jan 02, 2023 8:38 pm Post subject: 912ULS classic radiator cap pressure? |
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1.2 bar for glycol, and 0.9 for Evans waterless coolant is Rotax standard op.
Get Outlook for Android
From: owner-europa-list-server(at)matronics.com <owner-europa-list-server(at)matronics.com> on behalf of Pete <peterz(at)zutrasoft.com>
Sent: Monday, January 2, 2023 4:02:19 PM
To: europa-list <europa-list(at)matronics.com>
Subject: 912ULS classic radiator cap pressure?
--> Europa-List message posted by: Pete <peterz(at)zutrasoft.com>
Mine has 0.9bar stamped on it, and appears to start blowing when cht is around 220.
I either simply need a new one, or one of a higher pressure? I see discussion about 1.2bar being standard?
No idea why mine has a 0.9bar.
Cheers and thx,
PeteZ
C-GNPZ
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Burrilla
Joined: 25 Apr 2015
Posts: 182
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| Posted: Tue Jan 03, 2023 12:18 am Post subject: 912ULS classic radiator cap pressure? |
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Service bulletins sb-912-043-r2 and sb-914-029-r3 issued November 2006 uplifted the radiator pressure cap to 1.2bar.
It also has the ROTAX part no for the replacement.
I owned a Triumph Sprint motorcycle and found the radiator cap was the same size and pressure setting although whether you fit that is down to you.
Alan
Sent from my iPad
| Quote: | On 3 Jan 2023, at 00:05, JonathanMilbank <jdmilbank(at)yahoo.co.uk> wrote:

Many, many years ago it was advised to change from 0.9 to 1.2 bar. A friend gave me a spare, which he bought from an online motorcycle shop, which I think was intended for a water cooled Triumph? motorbike. Anyway it's smaller than those found on car radiators.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=509842#509842
|
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Duncan McFadyean
Joined: 18 Jan 2011
Posts: 218
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| Posted: Tue Jan 03, 2023 12:40 am Post subject: 912ULS classic radiator cap pressure? |
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Ditto most water-cooled BMW motorcycles, at a fraction of the Rotax price.
Duncan McF.
| Quote: | On 03 January 2023 at 08:17 Alan Burrill <alanb(at)dpy01.co.uk> wrote:
Service bulletins sb-912-043-r2 and sb-914-029-r3 issued November 2006 uplifted the radiator pressure cap to 1.2bar.
It also has the ROTAX part no for the replacement.
I owned a Triumph Sprint motorcycle and found the radiator cap was the same size and pressure setting although whether you fit that is down to you.
Alan
Sent from my iPad
> On 3 Jan 2023, at 00:05, JonathanMilbank <jdmilbank(at)yahoo.co.uk> wrote:
>
> 
>
> Many, many years ago it was advised to change from 0.9 to 1.2 bar. A friend gave me a spare, which he bought from an online motorcycle shop, which I think was intended for a water cooled Triumph? motorbike. Anyway it's smaller than those found on car radiators.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=509842#509842
>
>
>
>
>
>
>
>
>
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peterz(at)zutrasoft.com
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| Posted: Tue Jan 03, 2023 3:36 am Post subject: 912ULS classic radiator cap pressure? |
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Hi Alan,
Thx for those SBs! My engine is circa 1990's, which explains the cap. I would have expected the canadian rotax support/dealer to have included that in my SB's needed to be done when I had enquired when I purchased Troy's classic a few years ago now - I guess they missed it. I am running normal glycol (not evans).
I am going to give the Triumph T2108005 a try. I am also going to purchase some sort of pressure tester to ensure my system will have no leaks at 1.2.
Many thanks again!
PeteZ
On Tue, Jan 3, 2023 at 3:25 AM Alan Burrill <alanb(at)dpy01.co.uk (alanb(at)dpy01.co.uk)> wrote:
| Quote: | --> Europa-List message posted by: Alan Burrill <alanb(at)dpy01.co.uk (alanb(at)dpy01.co.uk)>
Service bulletins sb-912-043-r2 and sb-914-029-r3 issued November 2006 uplifted the radiator pressure cap to 1.2bar.
It also has the ROTAX part no for the replacement.
I owned a Triumph Sprint motorcycle and found the radiator cap was the same size and pressure setting although whether you fit that is down to you.
Alan
Sent from my iPad
> On 3 Jan 2023, at 00:05, JonathanMilbank <jdmilbank(at)yahoo.co.uk (jdmilbank(at)yahoo.co.uk)> wrote:
>
> --> Europa-List message posted by: "JonathanMilbank" <jdmilbank(at)yahoo.co.uk (jdmilbank(at)yahoo.co.uk)>
>
> Many, many years ago it was advised to change from 0.9 to 1.2 bar. A friend gave me a spare, which he bought from an online motorcycle shop, which I think was intended for a water cooled Triumph? motorbike. Anyway it's smaller than those found on car radiators.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=509842#509842
>
>
>
>
>
>
>
>
>
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SteveIvell(at)pestproof.c
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| Posted: Tue Jan 03, 2023 3:43 am Post subject: 912ULS classic radiator cap pressure? |
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The Triumph cap is a fraction of the Rotax cost and works fine…..I bought mine for £12 off a Triumph supplier in the UK.
Kind Regards
Steve Ivell
G-STES
Mob: 07971 128842
E-mail: steveivell(at)pestproof.co.uk (steveivell(at)pestproof.co.uk)
From: owner-europa-list-server(at)matronics.com <owner-europa-list-server(at)matronics.com> On Behalf Of Pete Zut
Sent: 03 January 2023 11:35
To: europa-list(at)matronics.com
Subject: Re: Europa-List: Re: 912ULS classic radiator cap pressure?
Hi Alan,
Thx for those SBs! My engine is circa 1990's, which explains the cap. I would have expected the canadian rotax support/dealer to have included that in my SB's needed to be done when I had enquired when I purchased Troy's classic a few years ago now - I guess they missed it. I am running normal glycol (not evans).
I am going to give the Triumph T2108005 a try. I am also going to purchase some sort of pressure tester to ensure my system will have no leaks at 1.2.
Many thanks again!
PeteZ
On Tue, Jan 3, 2023 at 3:25 AM Alan Burrill <alanb(at)dpy01.co.uk (alanb(at)dpy01.co.uk)> wrote:
| Quote: |
--> Europa-List message posted by: Alan Burrill <alanb(at)dpy01.co.uk (alanb(at)dpy01.co.uk)>
Service bulletins sb-912-043-r2 and sb-914-029-r3 issued November 2006 uplifted the radiator pressure cap to 1.2bar.
It also has the ROTAX part no for the replacement.
I owned a Triumph Sprint motorcycle and found the radiator cap was the same size and pressure setting although whether you fit that is down to you.
Alan
Sent from my iPad
> On 3 Jan 2023, at 00:05, JonathanMilbank <jdmilbank(at)yahoo.co.uk (jdmilbank(at)yahoo.co.uk)> wrote:
>
> --> Europa-List message posted by: "JonathanMilbank" <jdmilbank(at)yahoo.co.uk (jdmilbank(at)yahoo.co.uk)>
>
> Many, many years ago it was advised to change from 0.9 to 1.2 bar. A friend gave me a spare, which he bought from an online motorcycle shop, which I think was intended for a water cooled Triumph? motorbike. Anyway it's smaller than those found on car radiators.
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=509842#509842
>
>
>
>
>
>
>
>
>
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