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Old 03-30-2018, 06:56 AM
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IOW get em when you see em.
Old 03-30-2018, 07:19 AM
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Originally Posted by Hobbsy
And I think that is a monumental mistake given the fact that the FA-115 has the highest (4-stroke) output to physical size in a package the same footprint as a .60 2-stroke.

It is virtually the same size as the FA-65/8/91S series with identical footprint and only 1 mm taller and 1 mm more projection to the rear due to the larger carburetor..

My FA-115 fits into the same World Models 1/5 scale J-3 Cub cowl as my FA-91S did with only 1 mm more of the front edge of the rocker covers projecting from the bottom. Aside from the muffler and HSN, this is the only part of the engine that shows and I can hide it by adding a scale-like chin scoop to the bottom front of the cowl.

For those that like to maintain scale appearance, physical size matters a lot.

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Old 03-30-2018, 08:07 AM
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It's the FA-100 that makes little sense.
not where the 100 is most efficient , and the 100 has more bottom end torque than the 115, and a larger prop is more efficient than a smaller prop, , the 115 will only spin an APC 15x8 around 8,800, while the 100 will turn the same prop around 9,000, even if they turned that same RPM I'm sure the 100 will produce smother, more tractor-able power, it would have to, because it has the longer stroke

in these 2 links the 100 turned more RPM with an APC 15x8 than the 115 will,,, even Horizon's specs say the 115 will only turn the APC 15x8 at 8,800

http://www.rcuniverse.com/forum/tach...ito-115-a.html

http://www.rcuniverse.com/forum/tach...-1-00-rpm.html

Comparing the FA-115 to the FA-100 is like comparing a 302 SB Chevy to the 305 SB Chevy
Not a significant advantage for the slightly bigger engine given that they have exacly the same bore & valve trains.
when comparing a long stroke engine to a short stroke engine with the same C.I.D. any good engine builder will tell you the short stroke engine can be built to produce more power than the long stroke engine, and this is because the short stroke can utilize larger diameter valves and therefore have better Head Porting whereby the engine can use a higher performing Cam.

the stock Chevy 350 has a stroke of 3.480" (boar is 4.000 "),,, by using the Chevy 400 block (boar is 4.125") with a 327 Crank (3.250", you can build a short stoke 350, and it's larger bore will allow for larger diameter valves,,

now with all that said, I raced a 1967 Vett with the stock 396 (rated at 350 HP), and I beat it with my 71 Nova with a 327 L79 (rated at 350 HP/ 350 Pounds Torque) engine in it

Jim

Last edited by the Wasp; 03-30-2018 at 08:35 AM.
Old 03-30-2018, 08:18 AM
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Dave, did you ever have the thought that you could use a 130 Cylinder with 2 Plugs on a 65 Crank Case

Jim
Old 03-30-2018, 08:35 AM
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Originally Posted by the Wasp
not where the 100 is most efficient , and the 100 has more torque than the 115, and a larger prop is more efficient than a smaller prop, , the 115 will only spin an APC 15x8 around 8,800, while the 100 will turn the same prop around 9,000, even if they turned that same RPM I'm sure the 100 will produce smother, more tractor-able power, it would have to, because it has the longer stroke

in these 2 links the 100 turned more RPM with an APC 15x8 than the 115 will,

http://www.rcuniverse.com/forum/tach...ito-115-a.html

http://www.rcuniverse.com/forum/tach...-1-00-rpm.html
Unless those tests were done with the same fuel @ the same location on the same day under similar atmospheric conditions,(Density Altitude) those results are meaningless. The slight advantage in TQ means little when a propeller can be selected to maximize power.

I've seen a 300 RPM difference with the same engine at the same location with the same fuel under differing D A conditions.

I've seen a 50HP difference (.55 E T ) between a mid-morning pass and a mid-afternoon pass on the same 1/4 mile track with the same car.




Originally Posted by the Wasp
when comparing a long stroke engine to a short stroke engine with the same C.I.D. any good engine builder will tell you the short stroke engine can be built to produce more power than the long stroke engine, and this is because the short stroke can utilize larger diameter valves and therefore have better Head Porting whereby the engine can use a higher performing Cam.

the stock Chevy 350 has a stroke of 3.480" (boar is 4.000 "),,, by using the Chevy 400 block (boar is 4.125") with a 327 Crank (3.250", you can build a short stoke 350, and it's larger bore will allow for larger diameter valves,,

now with all that said, I raced a 1967 Vett with the stock 396, and I beat it with my 71 Nova with a 327 L79 (rated at 350 HP/ 350 Pounds Torque) engine in it

Jim
I used to beat up 396s, 383s, 440s, etc with my 340 Dart Swinger. I had 3.23 rears with a 1.41 3rd gear giving me a 4.55 FDR in 3rd gear. I would hang with them until they shifted to 4th gear and then walk away shifting to 4th at the end of the 1/4 mile @ 110 MPH.

Last edited by SrTelemaster150; 03-30-2018 at 08:38 AM.
Old 03-30-2018, 11:13 AM
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Unless those tests were done with the same fuel @ the same location on the same day under similar atmospheric conditions,(Density Altitude) those results are meaningless.
I agree, and 2 different Tachs almost never read the same numbers, so I guess we are talking for no real reason LOL

Jim
Old 03-30-2018, 11:47 AM
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Well, for whatever reason Saito chose to discontinue the1.15, I sold my 1.15 so I could get a 1.25. Then I sold that 1.25 so I could get the one I have now with the additional and larger cooling fins.

Last edited by Hobbsy; 03-31-2018 at 01:20 AM.
Old 03-30-2018, 12:11 PM
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Jim, the question about the 1.30 cylinder working on the .65, it could be done using the right cylinder, you would have to rig a carb to the side intake port. A little American ingenuity could accomplish it. The left cylinder would require the left cam be used.
Old 03-30-2018, 12:36 PM
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I still want to try one of those HP Carb's with the accelerator pump in it, but MECOA never Emailed me back

Jim
Old 03-30-2018, 04:13 PM
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This Webra Dyna Mix carb, (in the foreground) has as so called accelerator pump, it is a slot along side the slide valve that dumps fuel into the air stream as the slide opens. I never use a pump with the Dynamix although many say you should.
Old 03-30-2018, 04:38 PM
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Jim, is this the pump carb, I think and y slide carb like this one can be a pump carb without much effort.
Old 03-30-2018, 05:13 PM
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Dave, yes that is the HP Carb with an accelerator pump I am talking about, but they also have a larger one for their 120 twin, it wouldn't be that had to put one on a 100T, but 2 of then may be too much for a 100T

the one in your photo looks smaller than the Carb on my OS 61 FX

Jim

Last edited by the Wasp; 03-30-2018 at 05:31 PM.
Old 03-30-2018, 06:47 PM
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Dave, here is the HP Carb in parts, part number # 84-2210 is the A-Pump

let hope the photo is large enough to see,, yee-up

Last edited by the Wasp; 03-30-2018 at 06:50 PM.
Old 03-30-2018, 11:41 PM
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Originally Posted by Hobbsy
When you have to make two paragraphs worth of excuses for an engine that engine ain't much. Fifty rpm is the usual difference between changing normal conditions.
Dear David.Are you referring to sr's comments about the 115? if so you don't make that clear the way i read it.If however you ARE referring to what he said about the fa115's many attributes that were so clearly laid out in his post surely you would not read them as apologetic in any way.

Jim that's the funniest saito carb i ever seen...have you had any experience tuning a standard saito carb?
Old 03-31-2018, 01:29 AM
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Pete, I splained it better or more kindly as it should have been. I just received a new .62b, I like those new case engines.

Jim, it appears that the length of the pump stroke can be adjusted to suit your needs, as you can on the Webra Dynamix.
Old 03-31-2018, 03:31 AM
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Ever watched an exposed fanbelt on a piece of machinery and idly thought "i wonder what would happen if i just quickly touched it with my finger";...don't suck your tummy in and drop this thing down your shorts
Dave thanks i'm feeling kindly towards you now so was going to send you a whole bag of live crabs via airfreight,but could only fit one of them in.You be careful now ya hear?
Old 03-31-2018, 06:25 AM
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Originally Posted by Hobbsy
Well, for whatever reason Saito chose to discontinue the1.15,
The following snip proves my point and you explained why Saito is discontinuing engines that have no "gas" counterpart..


Originally Posted by Hobbsy
I sold my 1.15 so I could get a 1.25. Then I sold that 1.25 so I could get the one I have now with the additional and larger cooling fins.
And guess why they made castings with larger fins? They were having failures with the FG-20 so they made changes to enhance cooling and dubbed the new version the FG-21.
Old 03-31-2018, 08:00 AM
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Pete- that's funny about the 12 ga handgun shooting street sweepers. The .410 Taurus Judge has shells called hallway sweepers. I keep mine loaded with 000 buckshot. Shoots a nice pattern out to 30', or more. I wouldn't want to be on the other end of it. I shot it some a couple of weeks ago. I do have 00 buckshot shells like you said, but they spread a bit too much for me, but they would do nicely for a hallway. They keep trying to convince folks to give up our guns. A dumb*** female senator in a very left state said we don't need AR-15's. A cute little newscaster told her we have a Bill of Rights, not a Bill of Needs. Heh, sounds good to me. I don't know if Dave saw that or not.

Speaking of Dave- my opinion is that you should leave the FA-56 in the 4 Star. Just saying. One day you'll miss it and will remember that I told you so. And, yes- I'll be sure to remind you.
Old 03-31-2018, 08:42 AM
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That was a good one Barry, I rarely watch the news, I get mad and want to shoot the TV. I watch old westerns like Tales of Wells Fargo instead. The .56 is safe from being moved, the new .62 b will go on the Green LT 40.
Old 03-31-2018, 09:30 AM
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Jim that's the funniest saito carb i ever seen...have you had any experience tuning a standard saito carb?
no-p, but it's just another Carb, maybe a better one, but just another Carb

Jim

Last edited by the Wasp; 03-31-2018 at 09:53 AM.
Old 03-31-2018, 09:52 AM
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Pete,, the truth is>> I can not leave anything alone, I very much enjoy modifying things, anything,, when I was a kid, abound 7y.o. I was mad at my mom, I didn't know why she wouldn't let me take apart her clock,, she had this beautiful clock, about 8, 9 inches in diameter, it never worked, yet sat on the buffet for years. I asked her 100 times to let me take it apart, like all my toys, some times I fixed them,

I think Dave and I are a bit alike LOL

BTW, my mother finely sold that clock some 40 years later at a lawn sale for $5, boy, only if I had $5 when I was 7

Jim

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Old 03-31-2018, 03:41 PM
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Yes Jim, I dug into a Clinton 3 hp Montgomery Ward lawn mower engine when I was about 10, it ran after re-assembly. Then I had a MayTag washing machine engine for a few years after that. Then a 3.5 hp Fairbanks Morse.

I just ordered a Bush Hawk kit now I need to know what is the glow equivalent of a 480 electric motor. A Saito .30, I hope.
Old 03-31-2018, 03:51 PM
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OMG I have old folks skin!!! WTH happened! It's shiny!!!!!
Old 03-31-2018, 03:56 PM
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Can you see the flowing through your veins yet? If not you ain't old yet.
Old 03-31-2018, 06:18 PM
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OMG I have old folks skin!!! WTH happened! It's shiny!!!!!
well don't be expecting me to be holding your hand

Jim

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