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Old 11-16-2019, 04:43 AM
  #43726  
Hobbsy
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Piston bump
Yours surely has this piston bump.
Old 11-16-2019, 04:44 AM
  #43727  
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I had a 80 that I got fro a guy. They were so concerned about the high compression that they tried to lapse the piston. Now get me if I am wrong but itís a ringed engine that doesnít help.
thatís ok I got a great running engine for a decent price even back in the day.
Old 11-16-2019, 04:45 AM
  #43728  
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Originally Posted by Captcrunch44
Thatís awesome Dave I just love when guys pull out a box of parts and make an engine
Thanks, I traded that engine for an Enya mall case 90.
Old 11-16-2019, 04:46 AM
  #43729  
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Originally Posted by Captcrunch44


.13
i donít think so probably had running issues so they thought it had too much compression. Or they thought it needed a base gasket.
I sure donít know I am open for what you all think
The 80 HC did have running issues, for those trying to run oversized props or >10% nitro.

Interestingly back in early 2000 CH sold shims for the 120 hc and 150hc. Not sure about the 80 hc.
Old 11-16-2019, 04:48 AM
  #43730  
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I still have an original high compression 1.50 S and the .80, both CHI equipped, no shims.
Old 11-16-2019, 04:49 AM
  #43731  
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Yes it has a bump
I managed to find a couple more of those.
Old 11-16-2019, 04:55 AM
  #43732  
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Dave, if you put a 14x6 prop on that 80 hc and fed it 15% nitro on glow ignition would you find your prop in the neighbor's yard?

Last edited by Glowgeek; 11-16-2019 at 05:07 AM.
Old 11-16-2019, 05:47 AM
  #43733  
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Only if I got it lean, when it starts rattling, better make that your peak. With a MA Scimitar 13x6 it would go to 9,900 but 9,750 was much smoother. Of course that was with a Fox Miracle plug.
Old 11-16-2019, 05:47 AM
  #43734  
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Originally Posted by Captcrunch44

Ok
i think you all have talked about this in the past. But this is the first time I have seen a heard shim. Is this necessary or is higher compression better

Define necessary. Some folks are happy without them. Not sure how many of them have tried both ways, but they already "know"



i have run th HC 80 both ways on GLOW , 14% nitro and settled on an .008" brass shim.
Surely won't be taking it out or resorting to hauling a CDI around either. The HC 150 in my Rascal 110 is sporting a .010" shim. Another 80 that ran better shimmed was the Enya 80. Tuning isn't always about squeezing the last 200 RPM out of an engine.

Last edited by Jesse Open; 11-16-2019 at 06:34 AM.
Old 11-16-2019, 06:49 AM
  #43735  
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Agreed, suited to use is the goal. If I lived across the pond where high nitro is expensive and in some cases not available I'd be buying those early HC engines. If had one here in the US I'd shim up the cylinder/head to run more user friendly 10-15% nitro.

I like to tinker and hotrod things, model engines included. Rarely do I desire to go through the effort of squeezing the last 200 rpm out of an engine, my modded 82 is no exception. The PM Sbach 342 airframe won't accommodate a larger engine case without extensive rework and the stock 82 provided marginal power to pull out of hover. Raising the CR to 11.75, adding a custom muffler and 100 carb yielded almost 700 rpm gain with 14x6 prop and 15% fuel. Those are simple mods, no squeezing per se. That said, if I could have conveniently fit a 100 in the Sbach I would have. Alternatively if I had the cash flow for 30% nitro I may have gone that route.

The 82 I modded came out of a H9 46 size Red Tail P51. Thought that was overkill, so I swapped in a 62. With me it's not all about shoehorning in the biggest engine either. The P51 flies and lands much better with the lighter 62 and still has has enough power for multiple big loops when I'm good enough on the sticks to keep it smooth.

Last edited by Glowgeek; 11-16-2019 at 08:20 AM.
Old 11-16-2019, 03:02 PM
  #43736  
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Here's a good shot of the humpy piston also.
Old 11-16-2019, 05:04 PM
  #43737  
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Here is a humpty piston that I extracted while tuning a Saito 65.
History. Saito learned from their screwups
Old 11-16-2019, 05:22 PM
  #43738  
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Saito had a 65HC? I learn something new every day here.
Old 11-16-2019, 05:43 PM
  #43739  
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Gary, care package received. Both tachs work quite well, thanks!
Old 11-16-2019, 07:16 PM
  #43740  
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Originally Posted by Glowgeek
Saito had a 65HC? I learn something new every day here.

I am mating that piston to a brand-new, dual plug cylinder from the FA-325 radial engine.They should play together pretty well, as a 65 single.

The Futaba tach came from the estate of an early mentor, Gene. He was both a ham radio buddy and flying buddy. Did CW ( Morse code)!on the ham bands at very high speed, like 55 words per minute. Got me started on Guild acoustic guitars too. He would appreciate you having it, enjoy and just think Gene.
I miss him a lot, and those earlier flying adventures of the 1960s 70s and 80s. The Golden Era!

Last edited by Jesse Open; 11-16-2019 at 07:46 PM.
Old 11-17-2019, 02:51 AM
  #43741  
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Originally Posted by Glowgeek
Dave, if you put a 14x6 prop on that 80 hc and fed it 15% nitro on glow ignition would you find your prop in the neighbor's yard?
Lonnie dave used to be real good friends with his next door neighbour every time he leaned the fa150hc out to far, or it just got cranky at idle and spat the dummy/prop.

Dave i hope both you and Geri are well at the moment.
Old 11-17-2019, 03:04 AM
  #43742  
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Who thinks this stuff will make good after run oil for your saito engine?
Gary i like positive people who look back at good times with good thoughts, the cynics might say that all you are suffering from is 20/20 hindsight looking back through rose tinted lenses, but .... them.
Old 11-17-2019, 03:32 AM
  #43743  
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Hmmmm
Old 11-17-2019, 04:18 AM
  #43744  
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Times are times, it was good people that made the difference. Rose colored glasses won't change the current on-going dumbing down of this once great hobby.
Old 11-17-2019, 04:22 AM
  #43745  
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Originally Posted by Glowgeek
Saito had a 65HC? I learn something new every day here.

Lonnie, this is the 65 with the pictured humpty piston.

Early 65 with metered carb.
Old 11-17-2019, 04:29 AM
  #43746  
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Originally Posted by Rudolph Hart
Lonnie dave used to be real good friends with his next door neighbour every time he leaned the fa150hc out to far, or it just got cranky at idle and spat the dummy/prop.

Dave i hope both you and Geri are well at the moment.

Thanks Pete, I am well and she waiting to hear from a Dr. as to what to do next. That neighbor you mentioned moved to Tennessee about a year before we moved to Colonial Beach. I didn't realize that prop had gone over to his place. I guess props can fly pretty well without a plane.
Old 11-17-2019, 04:29 AM
  #43747  
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That 65 looks new Dave. A nice example.

Were all the "humpty piston" saitos high compression engines?
Old 11-17-2019, 04:44 AM
  #43748  
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It was brand new, I got it from a retired dentist in the north east.

The 65 reviewed in April of 1986 had the compression listed at 10.5 called Saito 65
The next, undated is listed at 12.7, called Saito 65=2
The third is listed at 8.6, called, Saito 65 updated.

http://sceptreflight.com/Model%20Eng...o%20FA-65.html

Last edited by Hobbsy; 11-17-2019 at 04:46 AM.
Old 11-17-2019, 04:46 AM
  #43749  
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This is my HC 65


as well as the 80HC with all aluminum exhaust.
Old 11-17-2019, 04:56 AM
  #43750  
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Gary, that one got missed at Sceptre Flight, the two they did test had 15.5 to 1 compression for the first and 12.5 to 1 for the second. It would be nice if the articles had dates on them, only a few do.

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