spaceworm

Hi dave,

Some report that v. stacks reduce power and/or cause other problems, epecially on the smaller Saito. What is your take on this? I have stacks on my 125 ABC and 180 AAC, and expect to leave them on. Comments? TIA. PS. I think some are flying this Saturday at WWRCC field. Se you there?

Best regards,

Richard

w8ye

My Feedback: (16)

The Saito GK 100, GK 115, and GK 125 do not come with velocity stacks from the factory.

The supposed reason is that they are not big enough. However, my experience is that on the 100, the velocity stack works fine.

I Do not have a 115

I have several 125's and I had a Saito velocity stack on one that I removed.

Hobbsy made a larger velocity stack for his 125.

The velocity stacks do not make more power. They give you less mess in the engine compartment and a little better fuel economy.

I know that the Saito velocity stack reduces power on the 125.

The O-rings I have used with the velocity stacks came from the hardware store. They looked about right to fit in between the stack and the carb.

blw

My Feedback: (3)

I think Hobbsy did a before and after test of the stacks on the 1.25, and he found out they need to be taken off the engines. I took mine off but haven't run it since.

w8ye

My Feedback: (16)

Yes, Hobbsy first used the Saito velocity stack and found that it reduced power.

Then Hobbsy made one from scratch that was larger

reyn3545

Has anyone tried the FG-14 yet?

I'm planning a twin-engine Baron, and looking for something in the .46 glow size, but would like to use gas, for obvious reasons. The FG-14 would be a little large, but too large is better than too small.

Gabrielsande

Hey I had  an engine a re-start once, it was running then it stopped before taking off, so when I put the glow stick on it, it started without touching the prop!!, probably the piston stopped just on the very top end. luckly throtlle was idling and I was behind the plane, now I take more care, the engine was a Thunder Tiger gp 60.

chunkyplunker

I had one start on me when I put the glow igniter on. Mine was an O.S. 46AX, I had just returned home from flying and realized that I had not run that one engine dry. It was setting on my front porch and when I placed the igniter on the glow plug it fired instantly. Not sure how I got away from it without more damage to me, but luckily all I received was a few nicks on my knuckles. I make real sure everything is out of the way now before I touch the igniter to the glow plug.

Hobbsy

My Feedback: (102)

Richard, the only one I lost a little power on was the 1.25, the 1.50, 1.80 and 2.20 have velocity stacks that are larger then the carb venturi. You have to be careful that the O-ring does not intrude on the airflow or it will reduce rpm some. I use a drill bit the exact size of the carb inlet, (not the venturi) to make sure the O-ring stays put. Although you can't see it in this picture the carb inlet is actually tapered inward as it aproaches the venturi wheras on the 1.25 the carb inlet is straight and slightly larger than the id of the velocity stack.

Jim, I don't recall trying a velocity stack on the 1.15 so I have no data on that and I sold both the 1.25 and the 1.15 recently since I have a 1.00 twin and a 1.30 twin. If I could take a guess I'd say the velocity stack would work fine on the 1.15 also.

Rudolph Hart

All apoligies back brother you set the timing and i'll pull the washers.Dave talks about intake tubes later in this thread,i don't know how much is true and don't drop any revs when i fit them to my small one's.Will they give a club number while we talk about how many revs you can get out of this engine or that one?

reyn3545

Not to take the thread on another left turn, but......

How does everyone feel about running the engine dry at the end of the day? I know the glow fuel can attack engine parts if left sitting, but running the motor until the cylinder starves itself for fuel doesn't sound too healthy for the piston and cylinder either. I've never ran the cylinders dry, but it's just because I'm too lazy to do it at the end of the day...

What does everyone else do?

mike early

In a perfect world the plane runs out of gas right when you taxi back to the pits. Some try to avoid pumping the fuel from the tank back into the bottle because they say it is contaminated from the exhaust gasses. But I usually drain my tank back into my fuel jug and then start the engine to run the last bit out of the lines/carb. I've never had any problems whatsoever.

Hobbsy

My Feedback: (102)

It won't be dry, this is a 1.15 and there is about a tablespoon full of oil in the crankcase after a run.

wyo69cowboy

My Feedback: (2)

Wow, I didn't realize there was that much left after running! Would probably explain why my 1.00 had the gummed valves: got started by the prior owner once or twice and all that nice oil settled down in the valve guides and rocker boxes, leaving the crankcase dry to rust the bearings! Oh well, my bearings should be here in a few days and hope to get it running shortly.

blw

My Feedback: (3)

Let me know if you need a club number.

Riverview

Has anyone had any experience with a Saito FA 100 twin installed in a plane with a compete cowling. I was wondering how you operate the choke. Do you even need the choke to get the engine started? My engine is new and has not yet been run. I have a 100 twin installed in a TF Cessna 182. I am using the fiberglass cowl which fits pretty nice. I had to create a hole for the needle valves and dimple the cowl slightly for the top rocker covers, but generally a nice fit.

wyo69cowboy

My Feedback: (2)

Yeah, I've got a couple Saito's now; better join the club!

w8ye

My Feedback: (16)

With an electric starter there is no need for the choke

Tarasdad

I could use one, thanks!

crossman

I put in for number a few pages back, but i'm not sure that I was given one.

greybeardaviation

My Feedback: (2)

No problem Old Fart,,no harm no foul. Wish all the SAITO lovers were with me todaySAITO'S, SAITO'S everywhere & I'm out of cash!!!! I'm at the Southeastern Model Show in Perry, GA. 3 huge buildings full of all things RC ( mostly air) and cheep SAITO's at every table....Heaven, if I was flush with$$$$$.

If any of you guys' have a weekend free about this time of the year you really should make the trip.

Fly slow-crash slower

mike early

how cheap is cheap?

Tarasdad

Going to the RC Expo in Pomona, California later this month. Better make sure my wife has all my cash and credit cards so we'll be able to pay a bill or two later on!

blw

My Feedback: (3)

679- Wyo69cowboy
680- Tarasdad
681- Crossman (must have missed you a few pages back)

andernamen

My Feedback: (3)

Started my Saito 91 with an electric starter. had a higley heavy hub on it, but no lock nut. The hub and prop came off in flight. Now I cannot get the engine started. I re-set the valve spacing to .002, but have been told the timing could have jumped from the engine over revving. Could this be true? Should I check the timing? The engine seemed to run fine before this.

w8ye

My Feedback: (16)

It is unlikely that the cam timing changed but there may be other problems

Broken valve spring

Valve float caused a push rod to jump out of its pocket and is holding the valve open

Valve float could have bent a valve guide the valve no longer seats

Either of these three things will result in the engine having no compression.