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Old 03-31-2018, 10:17 AM   #31
nlappos
 
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Default Re: 670 Rotax

Just finishing my installation of the 670 in the former 582 mount on my Avid Mk IV, serial number 1174D. Will post photos tonight. Overall, it was cake, the Rotax Rick engine slid right into the 582 mount. The two upper brackets fit perfectly, the 670 case had been touched up where the interferences were, so there was 1/8" clearance.
I used a Harbor Freight hydraulic lift table, and mounted the engine solo
The Mike Hair exhaust fits well, and stays inside the lateral confines of the cowl, as shown, but the muffler hangs below the lower OML, so I must trim the cowl bottom to fit.
The cooling system fits perfectly too. I retained the two nose radiators, and have a belly rad waiting in the wings for summer to come around.
I put 170 main jets in because I am at 6000 feet here in Utah.
I fitted an EGT system, and also will install the HACMAN mixture control that I had on my 582 (and which worked quite nicely).
I have to install a Facet electric pump to boost the fuel flow, since the old flat Mitsumi pump is only 9 GPM, and the 670 draws up to 11 GPM at full throttle. The two pumps in series should exceed that by quite a bit.
I hope to fly late next week.
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Old 04-04-2018, 06:02 AM   #32
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Default Re: 670 Rotax

Are you planning on running AVgas or auto fuel?
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Old 04-04-2018, 08:43 AM   #33
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Default Re: 670 Rotax

Quote:
Originally Posted by Bluebird19kf View Post
Are you planning on running AVgas or auto fuel?
I plan to run on High Test auto fuel (ethanol mix) and Amsoil 40:1 mix.
"Rotax Rick" says this works fine. The ethanol actually helps the octane, and my tanks are ethanol OK.
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Old 04-04-2018, 01:04 PM   #34
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Default Re: 670 Rotax

Thats wierd he told me to only run avgas and that is what his website says too.
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Old 04-04-2018, 01:27 PM   #35
nlappos
 
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Default Re: 670 Rotax

Quote:
Originally Posted by Bluebird19kf View Post
Thats wierd he told me to only run avgas and that is what his website says too.
Not really. He says 100LL is great, and don't sweat the lead. He also says that old car gas is a real problem, since the octane drops in just a few weeks. That is why he does not recommend non-ethanol car gas, it can't be trusted. He does recommend fresh ethanol high octane car gas.

Here is EXACTLY what his web site says:

"Fuel and Engine Oil
CAUTION

This information is for all aircraft that have metal, poly or non-fiberglass tanks (WITH EPOXY RESIN), not Polyester resin:

Buy fresh Ethanol premium gas preferred from Chevron, BP and Sunoco.
Use either Amsoil Interceptor OR Quicksilver PWC oil (any of the 3 types of Quicksilver is fine)
Run Premix at 40:1 ratio. (16 ounces for every 5 gallons of gas)
DO NOT EVER USE NON ETHANOL GAS (other than 100LL Avgas which is acceptable). Rotax has a warning that it is “old stale gas.”............
Fuel life is 2 months, depending on the amount of moisture it’s exposed to. You can add Stabile to the fuel if you know your flying may be limited.
AvGas 100LL is the very safest gas you can ever use. I have rebuilt 100+ engines that used it 100% of the time. Don’t listen to the know-it-alls."

https://rotaxrick.wordpress.com/fuel/
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Old 04-04-2018, 03:51 PM   #36
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Default Re: 670 Rotax

Ah, that must be where i got confused. At the time i didn't have ethanol safe tanks.
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