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Hot Shot oil use?

  • Thread starter Thread starter sfaret
  • Start date Start date
S

sfaret

Guest
I just wanted to bring attention to Hot Shot drivers re possible oil use.

Next time you are in for service check:
Black exhaust,
Black plugs,
Unexplained oils drips from the fuel servo area
Oil lying in the bottom of the intercooler.
3-4 hours or less of oil burn.

This was my case for 150 hours and one of the reasons I decided to start an overhaul in 2007 in the first place.

After the overhaul the same symptoms occurred. All looked well and we had many involved to try to find the cause. Including a tear down and reassy with new cylinders and etc and still the same. On the tear down there was obviously oil all where you'd think there should not be. It was clearly getting oil shoved down its intakes.

The only thing left was the scav pump. A Beach driver explained they had the same problem and it all went away after they replaced the scav pump.

After careful evaluation of the scav pump, it looked "A-OK". It was too simple to not work. After all, just moving thick oil, work or not work were the options, so we thought.

We got a new one anyways, ~$1800. It too looked the same. A-OK.

After the install we immediately saw less oil being used. All ports cleared up, Black gone and oil consumption up to 12 hrs/qt.

Still a mystery as to why the scav pump looked so well and performed so lousy.
:confused:

Who cares anymore? It's fixed.
 
Re: Hot Shot oil use?

Glad to hear it is resolved for you. Do you now plan on making this a regular replace item?

I suppose that I should just replace it as part of my overhaul as I have some of those issues you describe. Since I'm up to 2000 hours anyway I still need the overhaul.

Mark
 
Re: Hot Shot oil use?

I would try that first. Maybe you can get more time from that engine.
...assuming that you'll change it anyway.

Look in the intercooler. Take off the bottom tube and look. That will spell it out quickly.
 
Re: Hot Shot oil use?

atjudge said:
How about sending the pump back to the MFG and see what he says?
Click to expand...

I sent it back to Robin for exchange/eval. What he does when is a mystery. Not holding any breaths.
:rolleyes:
 
Re: Hot Shot oil use?

Wow:

Yea know I don't think I ever had better than 3 hours per quart. I have not seen any of the symptoms you have described here. I will try to take a look at the cooler again.

Thanks for the heads up. Man, I just cannot imagine burning only 1 quart in 12 hours. Wow

Jeff
 
Re: Hot Shot oil use?

FYI,

I'm not a Hot-Shot, rather a TCA with 200+ hours on a rebuild with factory new cylinders. I was a little concerned that I'm not burning enough oil.

I'm burning a quart every 25 hours or more. Compressions, oil temp, frequent oil analysis and cylinder head temps all look good and my A&P and others tell me not to worry about it.
 
Re: Hot Shot oil use?

Vince

My oil burns mirror your's. I use a quart to 2 quarts between oil changes @50 hours.

Don't think it is possibly to burn to little oil!!

(Still need to hook up with you and pick up the cylinder)
 
Re: Hot Shot oil use?

Commander91gm said:
Vince

My oil burns mirror your's. I use a quart to 2 quarts between oil changes @50 hours.

Don't think it is possibly to burn to little oil!!

(Still need to hook up with you and pick up the cylinder)
Click to expand...

Joel,

That sounds encouraging. I was used to burning a qt. every 10 hours until the OH.

We probably need to hook up after the 1st of the year for that cylinder. As I mentioned before, I've got four of them and one has your name on it, so be assured that it's not going anywhere.
 
Re: Hot Shot oil use?

Oil burn is somewhat like shock cooling. What should it use? What is bad?
My car doesn't use any.
I know a non COG (he's stuck up a bit) member with a TC that also uses 1/25.
Not bad guys.

All I know is that 1 qt/3 is NG, I'd take 1/8. 1/12 is super. 1/25 is fabulous. (I think)
 
Re: Hot Shot oil use?

atjudge said:
I'm about a 1/10.
Click to expand...

That's what I was from about 700 hrs since new until 1900+ hours. And then the only reason I decided on the rebuild was because the engine was darn near leaking more oil than it was burning:)
 
Re: Hot Shot oil use?

I've got about 750 now. I'd be very happy if I can get to 1900 hours with no problems. My Mech is of the opinion that if we overhaul 200 hours before recommended TBO I save alot of money. Another OWT?
 
Re: Hot Shot oil use?

Huh? How do we save a lot of money if our engines are sent for OVHL 200 hrs before TBO???
 
Re: Hot Shot oil use?

atjudge said:
My Mech is of the opinion that if we overhaul 200 hours before recommended TBO I save alot of money. Another OWT?
Click to expand...

Let's think about that for a minute or so.

....

Okay, I don't get it.

Taking a guess, the only thing I come up with is that the mechanic figures by going 200 before TBO you'll reuse more parts from the old engine. If that's the case then what he's also saying is that if you wait full TBO then more parts will be out of spec and will need to be replaced.

So, by doing the overhaul at TBO minus 200 you get to reuse parts that are only 200 hours away from being out of spec. Therefore, 200 hours after the overhaul you need to do an overhaul again.

:confused:
 
Re: Hot Shot oil use?

Right on Frank, another OWT. It's the same with some A&Ps over LOP ops and Lycoming also. Continental is working with GAMI on balanced injectors and LOP ops, at least that's what I've read.
 
Re: Hot Shot oil use?

I'm not too sure about that one either, but he said you can reuse more parts. I'm of the opinion if an engine goes the distance, if it's open then you replace everything, spend the money.
 
Re: Hot Shot oil use?

atjudge said:
I'm not too sure about that one either, but he said you can reuse more parts. I'm of the opinion if an engine goes the distance, if it's open then you replace everything, spend the money.
Click to expand...

Sounds like a good opinion to me.
 
Re: Hot Shot oil use?

I overhauled at 2250 hours 6 years ago ... engine was running great, great compressions, etc. The only reason I did it was that I couldn't fly for 6 months after the transplant. A guy down the alley from me has a 182 with 2900 hours and all is good. Just lucky? I did chat with my insurance company ... suprisingly, they did not care one whit about the hours, as long as it passed annual inspection. Underwriters look for any possible excuse to rate you up. If there was much correlation between overhaul time and engine failure, they'd be all over it.
 
Re: Hot Shot oil use?

We opened up the intercooler today and saw some oil. Therefore, I am getting some bypass on either the scav pump or the check valve. Question is how much oil did you see in there? We found a pool of about the size of a silver dollar and evidence of some oil throughout the pan. Sven how much oil did you have in there?

Mark
 
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