jett ss 40 questions
06-02-2002, 04:15 AM
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jett ss 40 questions
ss40,8.5x7.25 apc .15% omega fuel. engine is side mounted in pylon plane with bubbleless bladder tank(center of carb roughly center of tank)no fuel system leaks detected. tachs @ 16200 static with carb barrel just over 1/2 open , any further throttle kills engine.needle open 6 turns yet cannot get motor to richen up.. took needle right out and blew out passage no difference. engine is going on to a d dust with standard tank but want to work out the bugs first. glow plug as supplied by jett.will the standard tank help ?? what revs should i get on ground?? ive had numerous carbs that opening past 1/2-3/4 didn,t affect revs , same with ss carb?? any advice appreciated!!
06-04-2002, 01:15 PM
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jett ss 40 questions
Hi...Thanks for writing...
What I would suggest first, is to install the engine on a test stand, and run it there. This will eliminate a lot of variables, and is the first step in chasing down any potential problems.
Since you are finding that you can draw fuel with a partially open carb, but can not draw fuel with the carb fully open, the problem may be one of a few things.
You said you already checked the fuel and vent lines for leaks, ands made sure there was not obstruction in the fuel inlet, needlevalve and spraybar. Thats the first step. Also, make sure none of the fuel lines are kinked, twisted or restricted in any way. Blow into the vent line, and make sure the fuel flows out of the feed line freely.
Second (or maybe first)... Make sure the carb barrel is in the correct position! The SS40 carb operates in a reverse direction with respect to most carbs. Full throttle is with the throttle arm aft, which is idle position for most other carbs. If you look at the inside of the barrel, you will see a slotted area at the bottom of the barrel where the spray bar shoots fuel through while the carb is at full throttle. With the carb at partial throttle, the spray bar port is completely uncovered. If for some reason the barrel is installed 180deg out (upside down) the carb will work at part throttle, but at full throttle, the barrel will completely block of the spraybar inlet. Make sure the slot is on the spraybar side of the carb. If the carb has been apart at all, this is something to check.
Third... glow plug. Even thought the plug lights, it may be damaged, and "pop-out" when trying to go to power. Change the plug, see if that helps. Use a K&B1-L, K&B-HP, Merlin hot, or something in a similar heat range.
The SS40 will run equally well with the standard tank and the bubble-free tank. The only differnce there is to make sure you do not fly the standard tank down much below 1/4 tank, or you run the possiblility of a lean run and a blown plug as the tank empties out.
If after you check all of the above, and can still duplicate the same problem in a test stand, drop me a note, and I will attempt to help further.
I hope this is helpful
Bob Brassell
What I would suggest first, is to install the engine on a test stand, and run it there. This will eliminate a lot of variables, and is the first step in chasing down any potential problems.
Since you are finding that you can draw fuel with a partially open carb, but can not draw fuel with the carb fully open, the problem may be one of a few things.
You said you already checked the fuel and vent lines for leaks, ands made sure there was not obstruction in the fuel inlet, needlevalve and spraybar. Thats the first step. Also, make sure none of the fuel lines are kinked, twisted or restricted in any way. Blow into the vent line, and make sure the fuel flows out of the feed line freely.
Second (or maybe first)... Make sure the carb barrel is in the correct position! The SS40 carb operates in a reverse direction with respect to most carbs. Full throttle is with the throttle arm aft, which is idle position for most other carbs. If you look at the inside of the barrel, you will see a slotted area at the bottom of the barrel where the spray bar shoots fuel through while the carb is at full throttle. With the carb at partial throttle, the spray bar port is completely uncovered. If for some reason the barrel is installed 180deg out (upside down) the carb will work at part throttle, but at full throttle, the barrel will completely block of the spraybar inlet. Make sure the slot is on the spraybar side of the carb. If the carb has been apart at all, this is something to check.
Third... glow plug. Even thought the plug lights, it may be damaged, and "pop-out" when trying to go to power. Change the plug, see if that helps. Use a K&B1-L, K&B-HP, Merlin hot, or something in a similar heat range.
The SS40 will run equally well with the standard tank and the bubble-free tank. The only differnce there is to make sure you do not fly the standard tank down much below 1/4 tank, or you run the possiblility of a lean run and a blown plug as the tank empties out.
If after you check all of the above, and can still duplicate the same problem in a test stand, drop me a note, and I will attempt to help further.
I hope this is helpful
Bob Brassell
06-05-2002, 07:31 AM
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jett ss 40 questions
bob thanks for the input !! i just got the standard backplate i ordered or i would have tried the test stand earlier( conformal back plate interfered with stand ) a few days delivery to canada... you guys rock!! awesome engines,awesome service!!20 + engines & only 1 jett ?? not for long!! got an 11 pound cap that WAS going to get a moki ,what ya got that 'll give out of sight vertical?? i,ll let you know how it goes with the stand. thanks rob m.
06-05-2002, 11:43 AM
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Glad to be of help Rob!
Yes, the backplate can be an issue at times, depending on the test stand.
What size/model of CAP do you have? A few of us are flying the H9 CAP232 with the SJ-120 and it is absolutely amazing.
Yes, the backplate can be an issue at times, depending on the test stand.
What size/model of CAP do you have? A few of us are flying the H9 CAP232 with the SJ-120 and it is absolutely amazing.
06-10-2002, 07:14 AM
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bob, yup its a h9 cap. my last one had a st 2300 and vertical was good but certanly not unlimited!! your 120 sounds interesting. on my ss40 i tried a stock tank(better fuel draw but still dies about 3/4 throttle) even moved tank way above needle valve still no good. now i,m pissed!! pulled motor apart for thorough inspection & all looked good except for a hunk of carbon on top of piston at front. wait thats not carbon thats a hole!! piston has a small hole aprox 1/16" at ft doesn,t appear to go through to pin bore. could too high compression cause this?? i,ll be calling your shop and either ordering piston & sleeve or sending whole unit in. any idea on turnaround time?? thanks rob m
06-10-2002, 02:24 PM
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Rob,
Call Dub at the shop, tell him what you found. It sounds most unusual, and he will likely ask for you to ship the engine/parts back. This way he can check that piston, and also reslove the throttle problem. He can also give you a better idea on turn-around time.
Bob
Call Dub at the shop, tell him what you found. It sounds most unusual, and he will likely ask for you to ship the engine/parts back. This way he can check that piston, and also reslove the throttle problem. He can also give you a better idea on turn-around time.
Bob
06-11-2002, 11:04 AM
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bob i called& spoke to dennis mon. he was not overly concerned with the hole in piston as long as it didn,t go right through!!! call me crazy but i prefer my piston with only one hole!! he had a good suggestion of plugging exhaust & turning engine with starter throttle at full throttle to see how much fuel pukes out.now why didn,t i think of that!! (TRIED EVERYTHING EXCEPT THAT) the motor minus piston(KEPT IT FOR SHOW & TELL) goes out this am( JUNE 11)to the pros!! lets see if you guys can keep up with the high standards you have set . motor back on my plane running perfectly by the end of the month!!(DOUBLE DARE YA!!! )maybe you should give them a heads up that its on its way!!nudge nudge wink wink !! i,ll keep you & all the rcu junkies updated on the progress. on your marks ....get set....... GO !!!! thanks rob m
06-26-2002, 06:11 AM
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bob , unbelievable!! got my motor back today june 25. exactly 2 weeks including shipping to & from another country!!! i,ve had a crankshaft on order for OVER 6 MONTHS from one of your competitors (never did like cats i,m more of a dog person!)guess who gets my coin in the future?? as i,m on holidays motor was immediatly installed & fired up . RUNS excellent!!17900 static on ground & crap my pants fast in the air!!! piston problem caused by someone breaking the 11th commandment (if it aint broke, dont piss with it!! ) no it wasn,t me!!should make the new diamond dust blow away my first one..your service is the best i,ve recieved in this hobby(10+years) and your guys even sent me a neat little jett towel to wipe up the blood when i have a blonde moment!! what more could a guy ask for?? thanks for every thing !! who,se gonna tell the blonde her birthday bucks just went on a jett 120??? is celabacy really good for the soul?? just wondering! rob m
06-26-2002, 12:13 PM
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glad to hear it!
Hi Rob...
Glad to hear you are back in the air, and thank you very much for the kind words! One thing Dub and Dennis pride themselves on is customer satisfaction. It is hard to please 100% of the people 100% of the time, but they sure try
If you have the opportunity, email (below) me a few photos of your plane, with a bried description....... I can include it in the Jett Hall Of Fame section on the web site.
Bob Brassell
send photos to
[email protected]
Glad to hear you are back in the air, and thank you very much for the kind words! One thing Dub and Dennis pride themselves on is customer satisfaction. It is hard to please 100% of the people 100% of the time, but they sure try
If you have the opportunity, email (below) me a few photos of your plane, with a bried description....... I can include it in the Jett Hall Of Fame section on the web site.
Bob Brassell
send photos to
[email protected]
