Help/advice needed

[Kris Flynn]

Hey Jerry, at least your engine is alot cheaper, and spare parts are probably too

Kris

 

[Jerry Wyss]

Hey Jerry, at least your engine is alot cheaper, and spare parts are probably too

Kris

Yeah Kris, the P/S is up to $51 now, was $48.

Have tested a new set-up that shows promise,,put the OS 20J carb on along with the sleeve shims

I had before , raised boost port and used the "check valve" in the tank pressure line.

Also Grim 1440 B/C 3.33 cup @ 37.5 dia,, and this set-up is killer,,best throttle response I

have ever had on any RC vehicle. Now will it live?

 

[MalaysianFlyer]

Jerry, are you getting psychic?? I was hanging out at my LHS today, and the owner and myself were talking boats (of course), and were comparing teh TT and OS range of engines. Strangely enough, both the TT and the OS outboard have the sam bore and stroke, which made us wonder if the sleeve would be interchangable. Then of course we started looking at the car engines, and it looks like the OS is basically the same size as their range of car engines, and probably would benefit from using say the carb from the V-spec, or maybe even its sleeve. Or go the whole hog and mount the V-spec on the OB drive unit.

I looked through the TT engines, and it seems that the 21 car engine is basically the same size as the 26 car engine. but the bore and stroke are different to the OB engine. Am going to see of I can find the dimensions to compare and see if it is worthwhile trying to put one of the car engines on (especially the 26) What do you guys think? Any good? Or is this the same drivel you have to put op with from so many other newbies??

Has anyone tried cutting away the internal baffle on the TT exhaust? Curious about that

 

[Jerry Wyss]

Flyer, Your going to need a machinist Big Time putting a car engine on the TT lower.

I'm working on that kinda stuff right now and it's pretty serious buisness,,things

have to be exact on the bottom end of these motors or you'll end up with a

30,000 RPM Metal Grinder

Work on gettin' the TT with a pipe on it, there's plenty of speed in them right there.

With a pipe and 30% car fuel you can run them just the way they come and

have a blast with'em. (find a Octura 640 prop for sea level running)

The Stock muffler is going to hold the engine back, I don't think anybody has

gotten them to run "worth a hoot" with the muffler,,and Many Have Tried.

The O.S XM OB sleeve will not fit and it's compression adjustment capability

is limited to removing it's only shim giving you a hazardous close headspace.

The OS is not a good engine to modify like you would the TT.

There's a way of making the OS run beyond belief by removing the head shim,

mounting the motor on a Lynx, mixing up some 66% nitro fuel and having a

"World Class" prop tweaker make you a prop. The odd's of you doing it any other way

is over 1,000,000 : 1,,,,IMHO!

I'll send a pic of the proper cutout of the muffler for a pipe after work today.

 

[Mark Anderson]

Or you could send countless hours and hundreds of dollars on a non competitive combination. Ripping on a easily tuned affordable combination all the while.

Jerry, Eric was just ribbing you. Take a frigging salt pill and have a beer.

World class. That's hilairious.

Mark

 

[Jerry Wyss]

Sorry Flyer, I didn't get any pics taken,, been working out in the cold all week long and it's

taking it's toll. Don't pay any attention to the "nay sayer's", honestly, I don't know why they

interject like they do,,or even why they should be at all concerned with what I do :blink:

Here, this should really get'em goin',,, Jim Hill's Lynx, Jim made up this sticker on his own

 

[MalaysianFlyer]

Whoa Jerry, thats impressive!!!! Guess you do deserve it for the amount of performance you have gotten out of the motors.

I have been throwing around a few ideas in my head, but havent decided on anythign concrete yet, first I want to get the current motor to run like a demon, then consider getting a bigger demon :lol:

Not to worry about the pipe cutout, one of the boaters here did it sometime ago, and said he will assist me in doing mine, so thats quite safe. The only props I have on hand to try are the prather 215 that came with the engine and a borrowed prather 220. I think I will save the better performing props for the JD WOF as it will be worthwhile putting it on that hull. My present hull isnt really deserving of such props

I know what you mean about the nay-sayers, have seen enough of that on RCU, so I just ignore it. More fun to focus on the positive aspects of the hobby. Off to say my prayers now before trying out the engine tommorow, have a good weekend guys

 

[Jerry Wyss]

May The "TT FORCE" Be With You! :lol:

If you need anything let me know, like I said I have exhaust port cut P/S's,

Induction Window cut cranks, sleeve shims and low volume head buttons

coming around the New Year.

Jerry

About props, they will change considerably as you mod the engine.

With a basically stock engine with the pipe added an X640 is about

all I use to run,,the 215,,,ehh,not much there. A 220 is probably

too much prop.

Later mods showed the X637 was the prop to use,, the latest mod

motor likes the back cut Grim 1440's in the 37.5mm diameter. The

latter props are difficult for me to cut successfully, so I have Mark

at PROPS4U make them up for me,,,The Are Awesome!

 

[MalaysianFlyer]

Yeah I have seen Marks site, but will wait till i get more familiar, plus i think with too much power my hull wont take it, so it will be the JD WOF that uses it. Thanks for all the advice Jerry, it has been so helpful and great learning for me.

 

[MalaysianFlyer]

Jerry, ran the engine today, what a day of mishaps. First the engine did not want to stay consistent, kept running lean (or so i thought), as well as dying for no reason. Fiddled with the needles a good bit, but no luck. Then all of a sudden the engine cut right when i launched it, and it was jammed, couldn't turn it by hand. There goes the engine me thinks.

turns out it was actually the prop mount section that was jammed. fixed that and ran it, the engine performed well, despite one of the cylinder head screws falling out in the water (ran it like that the rest of the day) Then i get a nice flip, and amazingly my starter cone falls off the engine!!!!!

Looks like my prayers only affected the engine, but let everything else fall apart. :lol: I am very happy with the engine now, your mods worked a treat. Thanks for all the great help. Looks like the silicone managed to stay on and keep my compression safe heh heh

By the way, where do I find info on prop modification? like back cutting, cupping and so on? have been searching for a while but got zilch

 

[Jerry Wyss]

By the way, where do I find info on prop modification? like back cutting, cupping and so on? have been searching for a while but got zilch

Sorry "Flyer", can't remember what site I saw the "prop mods" on,, I think it may have

been a link from Marty Davis's site,,RCBoat.com or sumthin" :blink:

Can't remember exactly where but I do remember the drawings on there didn't help

much,,mostly the text was the big help.

Anybody else know??

Well, I did find it <http://rcboat.com/prop.htm>

 

[MalaysianFlyer]

Jerry, thank you, your a life saver!!!

 

[MalaysianFlyer]

Well, finally "destroyed" my motor with too many mistakes while trying to mod it. Now need to think of a) buys a new motor c/w lower unit for my WOF or B) get an alternative motor to fit on the TT lower.

All suggestions welcome :blink:

 

[shoboat]

Sunthar,

I like Jerry a lot,but I think you should join the club and get a O.S.. It will

eat the TT for lunch without too much trouble at all. Pull out the head shims

and feed her some 70% and you will be running well.

Sorry Jerry I know you love them tigers,

Have Fun,

Mark Sholund

 

[Tim_Duggan]

Which part(s) failed in the TT?

re: replacement engine - How fast do you want to go realistically, and how much do you want to spend?

 

[Jerry Wyss]

Yeah, Yeah Mark, He don't even know if he can get 40% in Malaysia :blink:

Has anybody got one of those OS's to run like that on anything Other Than

the Lynx??,,,

If not, then Sunthar, $300plus for a OS, around $300 for a Lynx,

maybe more, special fuel tank for Lynx , find you a couple props and mix

yourself some 66% nitro fuel ,pay about $250 for shipping and your there

,,,possibly :unsure:

We're just tryin' to stay reasonable here fella's,,,ease down, ease down

 

[Tim_Duggan]

 

[Jerry Wyss]

Aww screw it

 

[MalaysianFlyer]

Guys, I can understand that the OS is a good motor, But the price difference and cost of parts is not attractive. Added to that is the fact that anything above 30% nitro has to be on a special order basis over here, and extremely costly.

My most consistent source of fuel is usually cool power 30% heli fuel. as thats always available regularly, most of the car shops keep stock of sidewinder 25% but 30% is not always readily available.

So the TT actually is a better choice for me, at least till our hobby situation here improves. Plus with the limits on fuel and hulls available, there are three guys running the TT and kicking the OS's butt, two of them are modded, one is stock, but with a mod prop. Of course I agree that with the right hull or some work on the OS it would perform better, but we are just too limited at the present.

I havent had much trouble with the TT so until my fingers got "itchy" and careless

And Jerry is helping me to sort out a new engine, and I have the spares from the first one so it makes sense to stick to the TT for now. I had a look at the Mac and the Rossi, but they are really way too expensive, with the exchange rates figured in, its ballistic.

I will probably get the OS later on, based on the fact that most of you guys have recommended it, and hopefully sometime soon after that a mac or rossi with lawless foot.

Thanks to all of you for sharing your info and advice, it has been very helpful, even if I did not take it

 

[Jerry Wyss]

Hey, I just wanted to ask TimD if you have ever got a TT to deto with the stock

or cut-stock head button???