Rotec LCH

Jabiru 2200 / 3300 discussions

Rotec LCH

Postby rbarber » Mon Jun 05, 2017 1:25 pm

Attached is a report of my efforts/results of my installation of liquid cooled heads for those considering doing so.
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Re: Rotec LCH

Postby WaiexN143NM » Mon Jun 05, 2017 3:09 pm

Hi all, robert,
Thanks for the time to post this report. Interesting reading. We have a jab 3300 w the sonex baffles. Works well with a few small mods. We have alum blast tubes inside the baffles running to the back out to cool the coils. A good idea for jab or aerovee coils.
Contact with rotec seems to be universal. Spotty. Paul is a nice guy at oshkosh. Maybe they need to hire another person for the communications side of the house. Seems to be a problem everywhere these days. Lack of staffing.
Will you be at oshkosh again this year? Would like to see the install in person. Have fun flight testing. Be safe!

WaiexN143NM
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Re: Rotec LCH

Postby Corby202 » Mon Jun 05, 2017 9:08 pm

What an excellent write up Robert, well done. Although I have no intention of fitting water cooled heads, the information is helpful. Interestingly, in Australia if we were to fit water cooled heads onto a Jabiru engine, we would automatically place restrictions on the aircraft such as where we can fly and taking passengers.
I have the Jabiru supplied ram air ducts on my 2.2 Jab, they work well, cooling as never been an issue 260 degF being the highest I have ever seen one in summer time.

Phil
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Re: Rotec LCH

Postby peter anson » Mon Jun 05, 2017 11:59 pm

Hi Robert, interesting report. I also have the early engine with thick fin heads. I probably don't run it as hard, usually cruise at around 2800 and it runs cool so it will be interesting to see how well it lasts - only 321 hours so far.
Jabiru also sell a quick-start coil option. I was a bit fed up with difficult cold starting so contacted them and surprisingly the guy I talked to suggested instead that I just make a small mod to the Bing carb. I seem to recall it was drilling out the starter jet to a larger size. It didn't make much difference to starting but I eventually fixed the hard starting almost by accident in a totally different way. I put a little solar panel (about a foot square) on the roof of the hangar and whenever the Sonex is parked it is connected to it via a charging regulator. The battery is always fully charged so spins the engine just that bit faster and starts easily.

Peter
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Re: Rotec LCH

Postby rbarber » Tue Jun 06, 2017 1:26 pm

My CHTs were not high by normal standards, and had easily within spec temps as a general rule. Depending on ambient air temps, I saw CHTs from 255-300 F normally in cruise (at altitude~6000+ ft). But the spot right between the valve seats is the vulnerable spot. Since the Rotec Heads have the same design, I am unsure if the lower CHT will help with this flaw. Only time will tell...(not the ideal way to find problems in an aircraft engine).

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