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henry.voris
Joined: 02 Mar 2007
Posts: 116
Location: Pueo Field, Kula, Maui
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 Posted: Sun Apr 18, 2010 3:13 pm Post subject: HAC-Man Setup... Attn. Larry C. |
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18apr10
Larry C. (et al),
I recall several months ago you mentioned that you had installed a HAC-Man system... I was wondering how it worked for you? How much are you able to adjust your temperatures?
The reason I ask is, I have just installed one and I have only been able to increase the EGT by a mere 50 degrees (F).
GreenSky sent me a sea-level main jet and suggested that I use the set of jets the factory lists for sea-level operations. I did as they suggested.
Previously I had changed jets to produce the correct CHT and EGT for my field elevation (3800 ft.). To do so, I had changed the main jet, needle jet and needle to leaner jets than the prescribed sea-level set.
The temperatures stayed good around the patch and up to about 6,000 ft.(4,000 more to go to get to the summit at Haleakala). But, I had worried, if I were to descend to sea-level (to buzz the nude beach...) I would be running too lean. Also, I want to be able to lean the mixture enough to fly over the summit...
As I said before, I reinstalled the sea-level set of jets along with the HAC-Man system... When I get the engine warmed up I find both the CHT and EGT are low. I expect this, as sea-level jets should be too rich for 3,800 ft. Running the engine at 5,000 RPM and the CHT = 300 and the EGT = 950. After turning the HAC-Man knob more than the max 8 turns towards lean, the EGT increases by only 50 degrees, to 1,000. I was hoping for more...
Specifics:
Field elevation... 3,800 ft
Engine... Thundering 447
Idle Jet... 45
Main Jet... 165
Needle Jet... 2.70
Needle... 15K2
With this selection of jets and the HAC-Man full rich (off) a typical engine run after warm-up looks like:
RPM - CHT - EGT
3,000 - 210 - 890
4,000 - 240 - 1,000
5,000 - 300 - 950
6,000 - 375 - 1,000
6,400 - 380 - 950 - WOT
After making these observations, I throttle back to 5,000 RPM and move the HAC-Man to full lean... The EGT will move to 1,000. The system seems to be working, but not enough to justify its existence.
So I was wondering...
What are your experiences with the system?
How much variation of temperature can you induce using the HAC-Man?
Are you using the factory sea-level set of jets?
What's your field elevation? (I recall you have goodly elevation at your location.)
Any thoughts and suggestions from yourself or anyone else on the list would be greatly appreciated.
Aloha
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Henry
Firefly Five-Charlie-Bravo
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lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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| Posted: Sun Apr 18, 2010 3:33 pm Post subject: HAC-Man Setup... Attn. Larry C. |
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Henry,
Two of my last three posts are concerning the HACman system. On my HKS I can lean it to the point that I starve the engine of fuel. I had it to 1400 degree's earlier today, and that was with the choke on full. I am running the jets recommended for sea level which is 135's. Sounds like a call to Jerry is in order. If there is anything else I can tell you, feel free to email me off list.
Larry
Note: If you forward this email, please delete the forwarding history, which includes my email address.
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henry.voris
Joined: 02 Mar 2007
Posts: 116
Location: Pueo Field, Kula, Maui
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| Posted: Sun Apr 18, 2010 3:47 pm Post subject: Re: HAC-Man Setup... Attn. Larry C. |
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Larry,
Thanks for the info... Jerry is at the top of my call list for monday...
Always enjoy your vids.
Will review your past postings.
Aloha,
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Henry
Firefly Five-Charlie-Bravo
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