TT Pro 1.20 Question

[vicenterc at comcast.net]

Yes, the OS 140 RX and Mintor 140 creates enought vacum to open YS check valves.  I used to run YS engines in two models and I wanted to leave the T's for fueling.  Therefore, I left the check valve to avoid the separate venting line.  Both engines have been working fine for more than two years.  I am not sure about the TT 120 but I am almost sure that should be OK.
Vicente Bortone

-------------- Original message -------------- 

Does the pump create enough of a vacuum to use a one way valve?
----- Original Message ----- 
From: Rcmaster199 at aol.com 
To: discussion at nsrca.org 
Sent: Tuesday, June 29, 2004 7:35 PM
Subject: Re: TT Pro 1.20 Question


It sounds like a pumped set-up. The tank vent should be left open during operation, to allow air to enter as the fuel is used up. The caveat is that the vent will often syphon fuel out if the vent is out in the slip stream. I use a YS check valve to allow air in but no fuel out.

The 2 stroke 120 engine type should be able to turn a 16x10-11; 17x9-10 fairly well in the usable rpm range we need.

Why such a large engine on such a small model?

MattK



Subj:TT Pro 1.20 Question 
Date:6/29/2004 6:46:38 PM Eastern Daylight Time
From:pwl45 at yahoo.com
Reply-to:discussion at nsrca.org
To:discussion at nsrca.org
Sent from the Internet 



I'm experimenting with a Thunder Tiger Pro 1.20 and wondered if anyone knew
how the tank should be vented. The manual says to run the fuel pickup line
to the inlet on the pump and connect the pump outlet to the carb. Then it
says, "Never to connect the tube from muffler/pipes pressure nipple to fuel
tank with this pump system." I'm thinking I just need to run an open vent
line. Does that sound right?

Also, any advice on what prop to run?
This engine will be in a Tai Ji .60, runnning Pro Pattern 20%, weighting 9
lbs and running the TTR 9712 pipe.
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