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frank-margie(at)worldnet.
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 Posted: Wed May 14, 2008 6:26 pm Post subject: Cuyuna Cooling |
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REF:
In the mean time I brought out the Cuyuna 430 and am
prepping it to go in the UL-202's place for now.
They are Identical to the UL-202 except for the 7lbs
extra weight and a single 28mm carb.
If it works out I may go to dual carbs for more power.
I hear some were getting near 40 hp from a dual carb
430.
I'll compare it with the other engines performance to see how it compares.
Ray
Kolb UltraStar (Cuyuna UL-202)
Moni MotorGlider
Schreder HP-11 Glider
Riverside County, CA
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Ray,
The 430 is not identical to the U-L202. The early 430's went to the 32 MM carb, double head gaskets, and a special flow thru head, to try and cool them. With only partial success. The flow thru head had every other fin removed, to try and get more cooling air to the original head on the rear cyl. I think most of this was incorporated into the UL-202. I also believe the 202 had different porting locations on the jugs, in an effort to get more torque into the mid range.
The only really successful Cuyuna I ever saw was on Richard Swiderski's Ultrastar "Stork", and he ran dual carbs. I think he also used parts from both the 430 and the 202 on his most successful version. He may still be on this list, maybe he'd share some of his experience.
You probably do have a too much prop. Only good fix is a ground adjustable. Leaving it a little bit over propped will usually help keep EGT's in check. In my experience, the ground adjustables will out pull a fixed pitch even running at the same rpm. True anyway for Warp, GSC, and Powerfin. Probably not true for the old flat-bladed Ultra Prop.
Frank Clyma
Jacksonville FL
[quote][b]
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jb92563
Joined: 23 Mar 2007
Posts: 314
Location: Southern California
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| Posted: Wed May 14, 2008 10:37 pm Post subject: Re: Cuyuna Cooling |
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Thats good info...and since I have one of each perhaps I can make that perfect engine between the two.
For now I'll try the stock 430 with the 28mm carb and it does have the modified cooling fins.
I can rebuild the other one in the mean time.
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_________________
Ray
Kolb UltraStar (Cuyuna UL-202)
Moni MotorGlider
Schreder HP-11 Glider
Grob 109 Motorglider
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