w8ye

My Feedback: (16)

On the 91 there is no performance increase power wise. You do get less mess in the engine compartment and better fuel economy

On the 125 the Saito stack cuts the performance by a couple hundred rpm according to Hobbsy so he made his own.

Capt Lou

Guys:

This was my experience as well. When I put the velocity stack on my .91, I burned noticably less fuel (around a 20% improvement) and there was less mess in my engine compartment.

Capt Lou

Slats!

My Feedback: (1)

Do you need to put a filter on the stack??

Capt Lou

Slats:

You do not need to put a filter on the stack, although you could if it is necessary to keep dirt out of the engine. I have not used a filter and have had no problems. However, when you put the velocity stack on the carb, you need to put a seal or gasket between carb body and the velocity stack body to seal area around the carb air intake hole. If you just put the stack on the carb there is a space between the two bodies that is not flush and this will allow air to by-pass the stack and make it less efficient. I used a small o-ring that I bought a plumbing supply store.

Capt Lou

mike early

Hobbsy has a custom velocity stack for his 125 you say? I'd like to see that.

RPMcK

My Feedback: (1)

Mike,

go back to page 478 in the forum and you will find a discussion about veliocity stacks and a discription of the one Hobbsy made for his 125 I believe it was. I'm gonna try making one for a new 115 I just bought.
anyway - lots of information there.

Ron

BountyHunter51

W8ye, Thanks for your help. That puts my mind at ease.


Cheers! BH

w8ye

My Feedback: (16)

Hobbsy

My Feedback: (102)

OK

Hobbsy

My Feedback: (102)

Woops, sorry Jim, I was too slow.

mike early

I like the look of the new stack on the FG-20, but I don't imagine it'd work on the 125.

w8ye

My Feedback: (16)

Those of you who are not completely aware of the FG20 look here . . .

http://66.102.1.113/translate_c?hl=e...n10D0VM4apw8pg

mike early

Comparative fuel consumption

Gasoline
FG-20
Per minute 10cc




Glow
FA-125
Per minute 45cc



good fuel mileage of gasoline engines and their features of the plane dirt cheap low!

balsaeater

Thats debatable on how much the engine cost to buy compared to the glow version and how often you fly. Then there is the issue of possible lesser power compared to glow as in what sizes props the engines can turn at what RPM . I worked out for my Saito 180 in glow compared to gasoline it could take me some few years to get back the difference in fuel costs to break even on the extra expense to do gasoline . Also for me if I did do gasoline I would probably only do Aspen fuel which is a more cleaner more highly refined gasoline that hasn't all the whacky chemicals that ordinary gasoline has .This is so as to reduce risks of fuel gumming up from age issues and it stops all those nasty odours that gasoline has .(Aspen fuel costs are 50% to double the normal gasoline costs ) .Others ight chose to use Colemans but that often in Europe cost 4 to 10 times the price of normal gasoline if you can find it . If I don't use Aspen fuel I would have to buy a seperate tow trailer as the odour and pong from gasoline is wicked inside my small hatchback compact car.For a guy that fly several flights a time and several days a week the gasoline is probably better idea for the bigger engine planes coupled with a tow trailer or roof rack for the plane


Balsaeater

Capt Lou

Mike:

In my experience, this is a no brainer and I agree with you. Gasoline engines are more efficient and cost effective. I principally fly Saito .91 and 1.00. I pay $35 for a gallon for glow fuel. I also have an Extra 300 with a 50cc gas engine that costs about $3.50 per gallon of gasoline/oil mix. Since I have had the 50cc, I have used 10 gallons of gas in it or a cost of $35. An equivalent amount of glow is $350 or a savings of $315. My gas engine is just about broken in so I have a lot more flights to go before I replace it. At a 10 gallon break even/comparison point, I have recovered my cost differential between the 50cc and my Saito engines and have a lot more flying time to go on my gas engine which is incremental savings.

Capt Lou

mike early

I was just repeating the quote from the translated web site. I love it. But I do agree, it seems a great advantage.

Good fuel mileage of gasoline engines and their features of the plane dirt cheap low!

blw

My Feedback: (3)

1.5 oz per minute is high. I wouldn't go by those numbers.

welder1

Hi guys I have two saito .82s and two 1.80s. I am having a problem with them idling they will idle for a while and start to kind of make a poping noise and then die. I know how to set the high speed needle and ive been leaning in the low speed needle transition is good. It still has a popping noise almost like a miss after it idles for a minute or so does it sound like my low speed needle is still to rich? Any help would be appreciated thank you in advance oh and i would like to be a saito club member

mike early

I would think the LS is too rich still. Perhaps it is loading up and dying. Keep leaning the low side out until it cannot transition smoothly from idle to WOT and richen just a hair (1/8th turn)

welder1

Thanks Mike for your input i will keep leaning low end needle. How does cold weather effect these engines its about 35 degrees colder than the last time i have started these engines is this normal to have to lean the low end in colder weather?

mike early

I'd think it needs more fuel in the cold... Colder air=more oxygen per cc.

Hmm, we better let one of the experts answer that one.

Rudolph Hart

No,but i'd love to have his job when he karks it

N1EDM

My Feedback: (2)

Bob

Hobbsy

My Feedback: (102)

Part of what is happening is that the glow plug is cooling from the rich LS needle and eventually just goes out. Cold will have very little effect on the LS needle but may change the HS enough to need tweaked a little.

welder1

Hey guys thanks for the help i will lean it in a little more tomorrow and see what happens thanks agian.