YS 45 Muffler
 

I currently have a ys 45 with a tuned pipe, the thing is i tried bending the header on it to better suit my application, and it broke, i have 2 questions....

is there another muffler from a popular engine manufacturer that would fit my ys, just a standard muffler?

Where can i buy a header that will fit my YS? i found macspro.com and i would need part# 2671

RE: YS 45 Muffler
 

I have seen some YS 45s on that auction site and other places with mufflers. They were even advertised as the muffler for the engine. I don't know where you can get one now. I have a YS 61 that I found a Mecoa muffler that needed just a bit of filing in the mount holes to fit. I'm sure there may be a similar muffler for the YS 45. If you do find a source for YS 45 mufflers, please post it here for the rest of us. Thanks

RE: YS 45 Muffler
 

http://cgi.ebay.com/ws/eBayISAPI.dll...m=120447084518
http://cgi.ebay.com/ws/eBayISAPI.dll...m=120438223152
Here are a couple I had saved in my **ay list.

RE: YS 45 Muffler
 

You might also try YS Parts America. Contact Richard at 775-267-9252. Do post if you find a muffler.

RE: YS 45 Muffler
 

The use of the stock YS muffler will decrease the very high performance performance potential of this engine to the level mediocre 46 engine.
A performance muffler like the going out of business Performance Specialties "Ultra Thrust muffler" or the available Jett muffler are great but a tuned pipe is always gives the most powerful boost.

RE: YS 45 Muffler
 

Nelson is gong out of business?!! Freakingfast, do you know where i can buy a header for a ys45?

RE: YS 45 Muffler
 

I'm going with the Jett Engineering high performance muffler for my recently acquired YS .45.


Ed Cregger

RE: YS 45 Muffler
 

2670/1/2/3 are the part numbers at Macs Pro

RE: YS 45 Muffler
 

Quote:

---

ORIGINAL: freakingfast

The use of the stock YS muffler will decrease the very high performance performance potential of this engine to the level mediocre 46 engine.

A performance muffler like the going out of business Performance Specialties ''Ultra Thrust muffler'' or the available Jett muffler are great but a tuned pipe is always gives the most powerful boost.

---

Karl,


NOT EXACTLY!

This would hardly be the case...

Please read [link=http://www.rcmplans.com/issues/requested/content/reviews/pdf/r-rv-ys45fs-051988-1-1.pdf]Clarence Lee's review from RCM[/link].

With the original standard muffler, the engine spun an original Rev-Up 10x6 prop, on 10% nitro fuel, at no less than 16,400 RPM.
The Rev-Up 10x6 prop is load-wise very close to the APC.

The highly regarded Jett .46, using the normal OS .46 muffler, could only muster up 14,700 RPM on the APC 10x6, with 15% nitro...[link=http://www.jettengineering.com/accy/jettstream.html]Look here at the bottom[/link].

Installation of a JettStream, or an UltraThrust, would require the bolt-on adapter... It may not work as well as the normal bolt-through installation.

RE: YS 45 Muffler
 

thanks Dar, that was a good article

RE: YS 45 Muffler
 

MetallicaJunkie, so now where do we get our YS mufflers?[8D]

RE: YS 45 Muffler
 

YES!!! I called them to verify before i got my hopes up high, and yes they so sell the muffler with adapter plate that we would need to the ys 45 side exhaust

RE: YS 45 Muffler
 

Who are you referring to?

RE: YS 45 Muffler
 

I can get the same numbers with a Super Tiger 45 and a TT46Pro on stock mufflers with the APC11X6 @ 12,700.
And the same #'s APC 10X6 @ 16350 on 10% and 15800 on FAI fuel with the TT46Pro and stock muffler! For me, Mr. Lee’s results are good, but not shocking.


If you have enjoyed the power of a tuned pipe on a YS 45 and than put a stock muffler with new best prop on it, you’d swear you’re towing a drogue chute. That muffler seems very limiting as far as it will let the engine unload from the higher static numbers. That engine has perhaps the most powerful response to a tuned exhaust that I have ever seen, the OS 55 AX is a close second.

The adapter block needed for the tuned mufflers will move the peak down a bit, no big deal, you just need to adjust the prop pitch accordingly.

I know these guys well, My YS 45 spares drawer:

RE: YS 45 Muffler
 

Yes, he's quitting.

Sorry I just unloaded some YS45 FS engines and a bunch of variety side headers for them a few months back.
Check Flea bay from time to time or call Macs if you are in a hurry.

RE: YS 45 Muffler
 

sorry i wasnt clear... http://www.jettengineering.com/accy/jettstream.html

RE: YS 45 Muffler
 

Ohh thats not good for the pylon racers... Flea Bay is where i picked up my ys45,it was in beautiful condition...im not hurry, ill probably end up calling macs monday and buy a header, and also order a Jettstream muffler too

RE: YS 45 Muffler
 

Quote:

---

ORIGINAL: freakingfast

I can get the same numbers with a Super Tigre .45 ABC and a TT.46Pro on stock mufflers with the APC 11X6 @ 12,700.
And the same #'s APC 10X6 @ 16,350 on 10% and 15,800 on FAI fuel with the TT.46Pro and stock muffler! For me, Mr. Lee’s results are good, but not shocking.

---

Karl,


MJ was having doubts about the standard muffler, when he began this thread...


As to the RPM numbers you had stated...

The OS.46AX is currently; correct me if you think I am wrong, considered the 'benchmark' of .45-.47 engines. Not the performance monger; just the 'standard'...
It is definitely not the best performing engine out there, but equipped with the standard P-Box muffler in its original state and using 15% nitro fuel, it consistently spun an APC 10x6 prop, at 14,200-14,400 RPM, in virtually all the engine reviews done on it.

It achieved this performance, which calculates to 1.08-1.12 actual HP.

With the P-Box's baffle removed and spinning an APC 8.75x8.25NN Q500 prop, the same engine could only reach 16,100, which is 0.9 HP; a reduction of about 20% in the HP...
...Just when according to the 'rated' OS numbers, it should be very near to its 1.65 HP @ 16,000 peak... Now I am thinking perhaps the removal of the baffle, something most looking for the best performance from such an engine, would 'naturally' do, is what kills its top end... I finds it difficult to fathom.
I prefer the other assumption; i.e. that the rated power is either completely baseless, or achieved by the OS engineers with a full length open pipe, 20% nitro (decompressed) and with an A5 (now the#10) glow plug; not as it comes from the factory...

The OS clones of this displacement bracket, as well as other similar engines, with non-tuned exhausts, also consistently show about the same numbers on the 10x6 APC.
...This includes the TT.46Pro, by the way...

As to the Super Tigre .45 ABC engine, I have not seen it run with a 10x6 APC, but it does spin an 11x6 MA black prop, at 14,100, with its bulbous standard muffler, on 15% nitro.
The MVVS .49 showed 14,600 on the same prop, with the #3248 tuned muffler, on just 5% nitro, by the way.

[link=http://www.rcuniverse.com/forum/m_8194729/tm.htm]The tachometer forum[/link] shows significantly lower numbers for the OS.46AX on this prop.
The Clarence Lee test shows an even lower number for the YS (12,700 on the Rev-Up), but this compares with about 12,500 RPM, achieved with the OS on the APC...


The achievement of the YS.45 on the 10x6 is exemplary... Perhaps the non-tuned original YS muffler behaves like a Helmholz resonator at its tuned frequency, exactly in that RPM range; because frankly, on larger prop sizes, it is oh-hum rather ordinary, being out-revved, even by the ST .45ABC; a $65 engine, half the OS.46AX price and probably about a fifth of what this YS engine would have sold for today, had it been in production...

The OS P-Box (at least when de-baffled), does no such thing...


The TT.46Pro is very close to the OS on the MA black 11x6 prop and on the APC 10x6...

The [link=http://www.rcuniverse.com/forum/m_2082094/tm.htm]TT.46Pro tachometer thread[/link] apparently has some 'out of whack' tachs (or perhaps, 'out of whack' people), which apparently show the TT.46Pro with the normal muffler, out-revs the Jett .60LX with the JettStream...

RE: YS 45 Muffler
 

WOW!!!!

RE: YS 45 Muffler
 

You just blew my mind Dar, i think ill wait till im sober to make better sense of what you just posted(its beyond me ATM, its also 3am :D)

RE: YS 45 Muffler
 

MJ,


I basically replied to Karl's remarks regarding the TT and ST engines' RPM... and remarked about a couple of posts from the Tach forum threads...

I also entered my own experience, to compare to the results...

RE: YS 45 Muffler
 

Metallica

Yup, Dar and I can really go off in a tangent with competitive jabs of wit to put out good info(opinions;)), sometimes outright scary:)
Much of the time we agree, such as with fuel use and break-in methods, and than there are the other times........when I'm right [sm=wink_smile.gif]

I'm an opinionated SOB and proud of it.[sm=punching.gif]

RE: YS 45 Muffler
 

I agree with Freakingfast. The YS 45 is a totally different engine with a tuned pipe. With the stock muffler, I have three, it is just a run-of-the-mill 45. I have one with an Ultra Thrust and it turns at least 2000 RPM more that the same engine with a stock muffler. A Macs full length pipe turns even more and is easier to operate. If your looking to get the best speed out of it, go with the full wave pipe. If you are just looking for stock 45 performance, you could have done just as well with a stock TT P4o .46 for a lot less money.

Blessings, Terry

RE: YS 45 Muffler
 

ok im going to call macs on monday and see if they have a header , i can find one anywhere else

RE: YS 45 Muffler
 

I have a Rossi 45 that has a bolt on tuned silencer with a bolt pattern that looked similar to that of my YS45. So for kicks i unbolted it and see if it matched... i tried it out and it bolted on fine!!!!! cant wait to try it out