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MECOA wrote:Someone was asking about an old sq K&B carb not transitioning. It is because the end of the spraybar was bell mouthed by allowing the idle needle to flair the end of it.
Either the carb body/spray bar needs to be replaced or the end of the spraybar hole needs to be coined closed a little.
To coin it closed you can use a very flat punch, Remove the needle and lock nut and rest the carb on a flat surface. Slightly peen the end of the spraybar closed so only about 1/32" of the end of the idle needle fits into the hole.
This requires skill, you are on your own if you try this. Don't blame me if you screw it up.
Randy
chiefss wrote:Really. You say there is some kind of damage to the spray bar or something. Replacing the whole care would surely solve that problem.
MECOA wrote:OK now you said it was for the target plane. Those were spec'd to run full throttle and idle and transition was not required.
I would suggest replacing the carb. These were for military use only. Not to be sold to consumers.
Legal v8 wrote:MECOA wrote:OK now you said it was for the target plane. Those were spec'd to run full throttle and idle and transition was not required.
I would suggest replacing the carb. These were for military use only. Not to be sold to consumers.
Okay.. how much is a carb? Would it have to be converted to a remote needle or can I retain the needles in the carb?
Legal v8 wrote:Legal v8 wrote:MECOA wrote:OK now you said it was for the target plane. Those were spec'd to run full throttle and idle and transition was not required.
I would suggest replacing the carb. These were for military use only. Not to be sold to consumers.
Okay.. how much is a carb? Would it have to be converted to a remote needle or can I retain the needles in the carb?
I also forgot to ask what the differences between a "civilian" sportster and "military" sportster are. Is it just the carburetor or are the internals different too? From what others have said, my sportsters are on-par with the older non-bushed sportsters. Others have talked about the military planes and never brought up any physical differences. I watched a YouTube Monkey of someone flying one of those Mig's with the K&B and their engine sounded like it ran a lot better than mine..
http://www.youtube.com/watch?v=pcsje8Qpbqc
chiefss wrote:A lot of the engines were sold to civilians. I had a friend in the air force who flew the things at Fort Lewis, Washington. Then they were Foam deltas and used K&B 61's. The same as the old Veco 61. They came two to a box with a R&S radio and the K&B engine. The fuel was supplied by K&B in 55 gallon drums. The radio was on a military frequency so unusable in the civilian world.
He was authorized to sell off the unused engines and fuel to get funds to pay for other little items needed to make the airplane flyable. Props, spinners etc.
My club would take him empty fuel cans and fill them for 4 bucks a gallon for K&B 500.
Watching him do his thing was exciting as hell. When he chased the ground troops around they would shoot at it with small arms. Seldom hit it but occasionally a bullet hole would appear. The soldiers knew it was coming but didn't know exactly when. They would be bivouacked doing their thing and he would come zooming in unannounced. It was unbelievable.
Now the 20mm Gatling gun got him almost every time. It was radar controlled and locked on the engine. Somewhere around here I have a pic of a K&B 61 that took a direct hit from a twenty. Non repairable.
There airpalnes were called RCMATs. Radio Controlled Military Airplane Target. There was an article about them in RCM back in the early 80's.
The second bunch were the Mig 27 Floggers using K&B65's. Goldberg made them. The Deltas were more maneuverable but the Floggers were bigger and easier to hit and the Sprotster65's were a lot cheaper engine. No one felt bad about destroying them.
MECOA wrote:I am just telling you what was suppose to be done with these engines, I AM NOT SAYING ANYTHING BAD ABOUT YOU.
You keep saying the engine is new. These engines did not carry any warranty and were made for the military. Anyone that has one must realize what they have. I got the impression you are blaming us for the fact it will not throttle, this is why I am trying to make the point as to what you have. This is not our consumer version.
THEY WERE MADE TO BE DESTROYED. THEY WERE NOT TO BE SOLD TO THE CONSUMER MARKET. This was in the original contract 20 years ago. Please understand they were sold with no margin for customer support or warranty.
If I remember correctly the spec stated it must throttle below 5000 rpm.
I am Randy from RJL and before we bought K&B we proposed and qualified a competing design http://www.mecoa.com/museum/prototype/rcmat.jpg with a minimal throttle control. But the price point became so low it would be like trading dollars, no room for any mistakes. At this point we withdrew our proposal. After K&B won the contract I always heard from John Brodbeck how he wished he never won the bid.
With this said, if you would like to try the idle mixture disk, try it. I CAN NOT guarantee this will fix the problem. Or if you want to send it in for repair as a non warranty item you can.
But consider our position, most that get these engines for free from a friend will not spend any money on them. I hear it all the time... "I'm not going to spend $20 on it, I got it for free."
MECOA wrote:The 2nd hole was added for the .67 - 1.00 marine engines. It only affects the high speed running by allowing more fuel in. Either one will work on the .65 Sportster.
The location of the slot is very critical on the spraybar. As I said the military version was critical as it did not need to meet the requirements of the consumer version.
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