extra horses?

[Dave Spence]

Greetings-
I currently own an F-19 that I have flown on Edo 1400's the past two years. I often take another passenger with gear and have found myself frequently wishing for better performance than the 0-200 can give.

Any suggestions for boosting the horsepower of this engine. I know Lycon makes a larger piston, but, unfortunately, there's no STC for this modification. Would tuned exhaust system help? Hate to replace the engine and add the extra weight, change fuel tanks, etc.

Dave Spence
N3571T
Kenai, Alaska

[lfries]

Re: extra horses?

I'm in Visalia, CA. Several local pilots report 80 to 85HP after having their
A-65 ported and flowed by Lycon. If smooting out the interior surfaces on
can give an a65 15 to 20 HP perhaps it could do a little better for an O 200.
I'm not a mechanic so I only know what they say.
If you contact Lycon speak with Kenny.

[Ragwing nut]

Re: extra horses?

Not legally. A common modfication is to install C-85 pistons. It will bump the compression ratio about 1 point. I know of one that was dyno'd and made 120 hp. Again, it is not legal.

Mike

[jgerard]

Re: extra horses?

what prop do you have?

[Sloanlow]

Re: extra horses?

A-65 tribe

I have read that you can increase the size of your venturi and change the jet. to acheive 75 hp in the a-65. is there a STC to do this? Is there an STC to overhaul the A-65 and make it an A-75?

Jim

[jawinn]

Re: extra horses?

There is a service bulletin, I believe, from Continental about converting the A65 to A75. I don't know the specifics or even what needs to be done to be legal on the Tcraft. I've heard it consists of a piston change and drilling new oil holes in the rods. I've also heard that it's just a jet change in the carb. I figure I'll research that when I get to the overhaul part of the resto. Of course, if you find out, post it here!

[Ragwing nut]

Re: extra horses?

A-65 tribe

I have read that you can increase the size of your venturi and change the jet. to acheive 75 hp in the a-65. is there a STC to do this? Is there an STC to overhaul the A-65 and make it an A-75?

Jim

There is a Continental service bulletin that allows you to convert like models by chenging the required parts and adding a "C" to the data plate for converted. To change to an A-75, you have to install waffle head pistons, stellite valves, and drill oil squirts in the rod caps. You also have to change the prop to achieve the higher rated rpm and change the primary jet in the carb.

Mike

[Acroeric]

Re: extra horses?

Jason asked before but the prop is the key variable without doing any engine mods. My 0-200 really preferred a 74x42 (Sensenich or McCauley)

Many F19's came with a 69x50 and that is terrible for float operation. The key is to match your effective pitch to your cruise speed. (ie- if on floats you get 85 mph cruise then match a prop so at 80% effeciency it moves through the air at 85mph) All the Float Cub guys are running 74x38 to 74-40 with really good results.

Sensenich has this formula on their web page.

[Dano"T"]

Re: extra horses?

I run a 74-40 on my C90 Powered T-Craft with excellent results....still has 100MPH cruise as well. My C85 powered T-Craft on floats used a 72-42 also with good results. I have switched the props for the float season....the 74-40 is a better fit for float operations....longer-flatter...still cruises at 90 MPH on Baumann 1500 floats.

[VictorBravo]

Re: extra horses?

Several local pilots report 80 to 85HP after having their
A-65 ported and flowed by Lycon.

Those numbers sound doubtful to me. On the F-1 racing planes, turning 4200 RPM only raised the horsepower of a stock O-200 to about 115.

20 horsepower by porting and smoothing just sounds like a Jim Bede sales brochure.

In order for LyCon to get 15-20 horse on a 65 horse engine (which they really might be able to do), I suspect there's something else going on besides smoothing the ports.

They may be smoothing the camshaft... with a welding torch.

They may be putting in taller pistons.

I have heard of 65 horse crankcases with 85 or O-200 guts.

But any racer will tell you that it is very rare to find a 25-30% increase in raw horsepwoer by smoothing or flowing. 2 or 3% maybe.