Rotec Liquid Cooled Heads for Jabiru Engines

Jabiru 2200 / 3300 discussions

Rotec Liquid Cooled Heads for Jabiru Engines

Postby Andy Walker » Fri Jul 29, 2011 12:01 pm

http://www.rotecaerosport.com/product-info/lch/

These have been out for a while now, and several sets are flying. For people with Jabiru heat issues, this seems to really fix the problem. The factory tested a Jabiru 3300 with the LCH setup at full throttle for FOUR HOURS and never got CHTs higher than 230F. Rotec even claims lower fuel burn because you can lean more without overheating (take that one with a big grain of salt). It would definitely take the urgency out of taxiing, which also adds safety as you get time to actually catch any problems before you have to takeoff to avoid overheating.

The full system with water, radiator and piping adds about 16lb from reports, which with the standard 178lb 3300 weight puts the engine just shy of the 200lb FWF weight limit for Sonex aircraft. You could probably shave some weight off this by using a smaller radiator, relocating the battery or other items, etc.

You have to e-mail Rotec for pricing, but the price used to be on their website and I believe it was about $3500. Add the radiator and miscellany and call it $4k. You might recoup some of this by selling your old aircooled heads. Anyway, I think this is a great idea, and I'm glad it's out there. I'd love to hear from anybody who has experience (direct or word of mouth from others) on this product.
Andy Walker
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Re: Rotec Liquid Cooled Heads for Jabiru Engines

Postby N111YX » Fri Jul 29, 2011 7:55 pm

Good points, Andy.

For that price and weight, I'll take the Continental 0-200... 8-)
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Re: Rotec Liquid Cooled Heads for Jabiru Engines

Postby Andy Walker » Thu Oct 20, 2011 2:39 pm

Here's a nice video demo of the Rotec heads, for those who haven't seen it:

http://www.youtube.com/watch?v=MfftfKg0yvo&feature=related
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Re: Rotec Liquid Cooled Heads for Jabiru Engines

Postby Goodflight777 » Tue Feb 18, 2014 10:52 am

Has there been any developments on this since the 2011 posts?
Anyone hear anything or have experience with them? Rotec is still in business but I don't see much online reference to the liquid cooled heads.
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Re: Rotec Liquid Cooled Heads for Jabiru Engines

Postby fastj22 » Tue Feb 18, 2014 8:43 pm

I pursued them for a brief period right before 2013 OSH to handle my issues with unbalanced CHTs during Phase 1. Was almost ready to pull the trigger and buy them, then talked to both Sonex and JabUSA at OSH and got some good advice on fixing the problem. After some work, I was able to get them under control and am happy not having the complexity or weight of the LCHs. However, I don't discount they might be a great solution, just not for me right now.
I don't think they have been installed on any Sonex.
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Re: Rotec Liquid Cooled Heads for Jabiru Engines

Postby Major36 » Thu Jul 17, 2014 6:26 pm

Andy and good flight email me at major4567@yahoo.com. I purchased the LCH and have tons of pics.

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Re: Rotec Liquid Cooled Heads for Jabiru Engines

Postby SvingenB » Fri Jul 18, 2014 1:09 am

fastj22 wrote:I don't think they have been installed on any Sonex.


Yes they have. Here is a Jabiru 2200 on a Sonex. It has LCH ftom Rotec and turbo

http://www.rotecaerosport.com/2014/03/k ... biru-2200/
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Re: Rotec Liquid Cooled Heads for Jabiru Engines

Postby allycol » Sat Nov 29, 2014 11:06 pm

Rotec LCH if you have them or thinking of buying be very very aware very bad design. I bought them 2 years ago done a major overhaul found 2 heads had loose valve guides, the guide hole was to big by 8 thou he tryed to botch it up by nurling them did not work. allso the pushrod tubes leake oil i have never been able to stop leak completely they are a very bad design dont touch them. He said sometimes to save throwing them away we try to fix, yep at the risk of my life I would not buy a nut and bolt off this guy. if you have them remove and get inspected by professional.He says he is a professional engineer if he is he would not do shoddy work on aircraft parts.
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Re: Rotec Liquid Cooled Heads for Jabiru Engines

Postby Major4567 » Sun Nov 30, 2014 7:59 pm

My LCH have been on for about 30 hours now. Head temps stay between 190-200 F. Head bolts have been checked periodically with no movement. I have had no problems with my Liquid cooled heads at all. I thought the workmanship was first rate. Factory support was always prompt, friendly, and informative. No leaks have been detected whether it be coolant or oil. I'm happy so far.

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Re: Rotec Liquid Cooled Heads for Jabiru Engines

Postby daleandee » Sun Nov 30, 2014 8:25 pm

Major4567 wrote:My LCH have been on for about 30 hours now. Head temps stay between 190-200 F.


Hi Steve,

Where are you getting your CHT readings from? Perhaps I should put this into another thread but my question has to do with CHTs that might be too cool. My Sonex is Corvair powered and my CHTs are extremely cool ... especially like last Friday with the OAT in the mid 40's my CHTs were difficult to get near 220ºF once I got up into cruise. I could barely get them near 180ºF before take-off. I'm reading under the rear spark plugs.

Oil temps were a bit better at 178ºF but my OT in the warm summer is usually between 200-220ºF depending on how hot the OAT is. I've read that some engine builders give 150ºF for a minimum CHT temperature. I've had a couple of very knowledgeable engine gurus ask me what problem I'm trying to solve.

With your temps that low do you have any issues with 100LL? Are you using Mogas or Decalin to help with lead build up or has that been a concern at all? Don't misunderstand ... I'm pleased that mine runs cool as I can get my summertime CHTs up to about 270ºF on a hot day if I lean it out to 1250ºF or a bit higher on EGT.

Would just appreciate some input as to how your engine performs with the much lower, and what I believe, to be a more ideal CHT temps for aluminum cylinder heads.

Dale Williams
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