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<P>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.</P>
<P>Vicente Bortone<BR></P>
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<DIV><FONT face=Arial size=2>Does the pump create enough of a vacuum to use a one way valve?</FONT></DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B> <A title=Rcmaster199@aol.com href="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, June 29, 2004 7:35 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: TT Pro 1.20 Question</DIV>
<DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 face=Arial size=2 PTSIZE="10" FAMILY="SANSSERIF">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.<BR><BR>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.<BR><BR>Why such a large engine on such a small model?<BR><BR>MattK<BR><BR><BR>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px" TYPE="CITE">Subj:<B>TT Pro 1.20 Question </B><BR>Date:6/29/2004 6:46:38 PM Eastern Daylight Time<BR>From:<A href="mailto:pwl45@yahoo.com">pwl45@yahoo.com</A><BR>Reply-to:<A href="mailto:discussion@nsrca.org">discussion@nsrca.org</A><BR>To:<A href="mailto:discussion@nsrca.org">discussion@nsrca.org</A><BR><I>Sent from the Internet </I><BR><BR><BR><BR>I'm experimenting with a Thunder Tiger Pro 1.20 and wondered if anyone knew<BR>how the tank should be vented. The manual says to run the fuel pickup line<BR>to the inlet on the pump and connect the pump outlet to the carb. Then it<BR>says, "Never to connect the tube from muffler/pipes pressure nipple to fuel<BR>tank with this pump system." I'm thinking I just need to run an open vent<BR>line. Does that sound right?<BR><BR>Also, any advice on what prop to run?<BR>This engine will be in a Tai Ji .60, runnning Pro Pattern 20%, weighting 9<BR>lbs and running the TTR 9712 pipe.<BR></BLOCKQUOTE><BR><BR></BLOCKQUOTE></FONT></FONT></BLOCKQUOTE></body></html>