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arno7452(at)bellsouth.net
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 Posted: Mon Feb 05, 2007 5:21 pm Post subject: Decision on Carb Heat for Rotax 912 ULS!!!!!! |
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Listers,
Many thanks for all the good comments regarding Carb Heat. I have discussed the issue with Lockwood and Zenith in Mexico. Here is summary of discussion with Zenith: The cowling for the CH701 maintains a relatively warm environment. If the Rotax airbox is not installed, NO carb heat is required. So, my CH701 will be using the new cowling and there will be no airbox. So, I will not install carb heat.
These comments are based on discussion with Sebastian Heintz at Zenith today 2/6/2007. Sebastian indicates there are hundreds of Rotax 912s that do not have carb heat. They are doing nicely. He also estimates about 3 hp is lost by not using the airbox to draw in cold air.
To the best of my knowledge, I received no comments from Zenith owners flying behind the 912 without carb heat.
The carb heat upgrade can be retrofitted at a later date. It is a collar that fits on the carb and circulates cooling fluid. Fairly simple install I'm told.
Again, many thanks for your interest and comments.
Ken Arnold
Pikeville, NC
CH701 QB in process
[quote][b]
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daveaustin2(at)can.rogers
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| Posted: Tue Feb 06, 2007 7:00 am Post subject: Decision on Carb Heat for Rotax 912 ULS!!!!!! |
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Ken,
I've flown my 601 912 for 14 years and never had any icing indication. No carb heat. This is a statement of fact, not a recommendation. I'm in Toronto Canada.
Tailwinds.
Dave Austin 601HDS - 912, Spitfire Mk VIII
[quote] ---
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Gig Giacona
Joined: 10 Jan 2006
Posts: 1416
Location: El Dorado Arkansas USA
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| Posted: Wed Feb 07, 2007 7:49 am Post subject: Re: Decision on Carb Heat for Rotax 912 ULS!!!!!! |
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Though I'm not planing on using a Rotax engine what makes them immune to carb ice?
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_________________
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR |
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dirkslabbert(at)telkomsa.
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| Posted: Wed Feb 07, 2007 8:28 am Post subject: Decision on Carb Heat for Rotax 912 ULS!!!!!! |
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Both carb float bowls are cleverly placed in the hot airstream behind each
bank of cyl's.
Dunno about immune .....
Dirk
The 2 prick 701.
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daveaustin2(at)can.rogers
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| Posted: Wed Feb 07, 2007 11:22 am Post subject: Decision on Carb Heat for Rotax 912 ULS!!!!!! |
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When used on the 601 and 701 the carbs draw air from inside the cowl close
to the firewall. Heat in the cowl effectively gives you continuous carb
heat. So yes, power is reduced by some amount.
Dave Austin 601HDS - 912, Spitfire Mk VIII
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David X
Joined: 10 Jan 2006
Posts: 154
Location: Princeton, NJ, USA
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| Posted: Wed Feb 07, 2007 8:23 pm Post subject: Re: Decision on Carb Heat for Rotax 912 ULS!!!!!! |
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It's not a prone to it, but it deos happen.
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_________________
Zodiac 601 XL - CZAW Built - Rotax 912S
DO NOT ARCHIVE |
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