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Engine basics => Engine set up tips => Topic started by: Rusty on March 23, 2011, 02:21:30 AM

Title: Blank
Post by: Rusty on March 23, 2011, 02:21:30 AM: Blank
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: Bill Little on March 23, 2011, 09:54:55 AM: Hi Rusty,

I suspect it would work with a "true venturi" like the old Super Tigres use.

Randy can supply one as well as the "usual" suspects (Jim Lee, Scott Riese, Leonard Neumann, Byron Barker, Tom Dixon, local machinists, etc..) who make venturi, I'm sure.

Big Bear
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: dennis lipsett on March 23, 2011, 11:03:41 AM: Bill, Don't get an origional TT venturi for the engine. It's too big a throat diameter.
The needle valve is fine or you can also use the OS15 NVA.
Dennis
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: dennis lipsett on March 23, 2011, 07:19:30 PM: Go to Tower Hobbies web site. Type in OS engines. Look under accessories. Check in carb section it is in there.
Dennis
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: dennis lipsett on March 27, 2011, 10:47:55 AM: I don't think that anyone recommended the OS15 venturi, only the needle valve. You can probably get a venturi from Jim Lee at Lee Machine shop. he is in the vendors section
Dennis
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: Dennis Moritz on March 27, 2011, 10:50:00 AM: People set these up. I believe the case is usually drilled with a venturi in it to match up the holes. A friend modified a 15 Magnum engine for me, also uses a pinch bolt to locate the carb. The FP 15 needle and venturi fit the case after that. The needle going through the case like a stock FP. Looks good. Leonard Neuman talks about setting Magnums up. Check with him. See if he's still doing the CL conversion.
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: Target on January 09, 2017, 09:22:56 PM: Dennis-
Do you happen to remember (or does someone know) if the OD of the OS .15 venturi where it fits into the crankcase is .350"?
I have a TT .15 baffle engine that wanted to get going, and I'll just buy the OS venturi if I think it will fit, and then drill the case for the OS needle as well... Of course, there is the offset of the hole for the needle in the venturi, relative to the shoulder, to consider....
See pic.
Thanks, and sorry for the digging of ancient history!
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: Target on January 25, 2017, 01:43:54 PM: Based on a post in "the OTHER forum", I have discovered that the OS .15FP venturi that Tower sells is .333" OD where it slides into the crank case; the TT carb neck is .350 as I measure it.
I'll have to find one that diameter or get one made for my little TT .15 baffle engine.

R,
Chris
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: Akihiro Danjo on January 25, 2017, 08:33:15 PM: Enya's venturi for 15-20 may be usable for your TT15 because the shank is 8.8mm though I don't know the OD of sparbar of TT15. (ENYA's spraybar is 4.0mm dia)

http://www.ebay.com/itm/ENYA-15-19-20-C-L-VENTURI-DELRIN-NIP-/291989429366

ID of 15522 is 6.7mm, so it may be too large for your TT15.
15521 is 6.0mm and it will be fine for 15.

Aki
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: Target on January 25, 2017, 09:38:28 PM: Thanks for the lead on this, Aki!
I'll check it out.
Best Regards,
Chris
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: M Spencer on January 26, 2017, 04:48:27 PM: Wots the width of the CASE at the Spray Bar , Rusty ??

It has a venturie like a super tigre pherical jet one .
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: Target on January 27, 2017, 06:59:00 PM: Does anyone have that guy on ebay, "shtterman" contact info direct?
I think he may have that Enya venturi that Aki mentioned, and hoping the distance from the shoulder to the needle hole is right for me.
Thanks,
Chris
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: Target on February 07, 2017, 06:27:35 PM: Quote from: Akihiro Danjo on January 25, 2017, 08:33:15 PM
Enya's venturi for 15-20 may be usable for your TT15 because the shank is 8.8mm though I don't know the OD of sparbar of TT15. (ENYA's spraybar is 4.0mm dia)

http://www.ebay.com/itm/ENYA-15-19-20-C-L-VENTURI-DELRIN-NIP-/291989429366

ID of 15522 is 6.7mm, so it may be too large for your TT15.
15521 is 6.0mm and it will be fine for 15.

Aki

I bought a 15521 from Shtterman on Ebay, and it looks like it should easily fit, Aki.
I wonder if the 4mm diameter Brodak NVA will allow enough breathing for the 6mm venturi neck though? I would think it would have to, since that is the size of the cross drilled hole in the venturi.
I'll probably have to get an 8mm x 1mm o-ring, because I think that will be what it takes to seal the gap between the venturi shoulder and the case. Not a real problem, I need a seal anyway. The very thin rubber gasket is too thin indeed, but I think the 1mm oring should be about right.

Thanks again for the lead on a over the counter part, Aki!

Respectfully,
Chris Behm
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: Akihiro Danjo on February 08, 2017, 12:01:07 AM: I guess 6.0mm is a good starting point for 15.
It is easy to ream the ID, if you want to, depending on the temp, alt, model, fuel, tank size and etc.
You will be able to find the best ID between 6.0 and 6.5mm.
Aki
Title: Re: Venturi / Needle Valve for Thundertiger 15
Post by: Target on February 08, 2017, 12:29:43 AM: Ok, thanks Aki, I will try the venturi as it is, and with the 4mm needle first, to see what it runs like.
Thanks,
Chris