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» Forum Name: PT Boats - General
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» Topic: 305 Engine test
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Engine test at NRE Bellchase LA

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We had dynamometer problems ,it would not hold over 930 hp at 1/4 throttle for 30 minute.



Posted By: RANDY SMITH | Posted on: May 16, 2015 - 6:39pm
Total Posts: 182 | Joined: Jul 16, 2012 - 7:16pm

Sorry to hear that, Randy- hope the problems aren't serious- please keep us posted.

Randy (new guy here at the board)

Randy

Posted By: Deep Vee Forever | Posted on: May 16, 2015 - 9:24pm
Total Posts: | Joined: Unregistered

The Dyno is the problem, not the engines It was a left hand rotation dyno we have right hand rotation engines . The engines will run up but the water brake would not load more than 930 hp , We were at 930 and barley running boost.



Posted By: RANDY SMITH | Posted on: May 17, 2015 - 2:04pm
Total Posts: 182 | Joined: Jul 16, 2012 - 7:16pm

Randy, your post brings to mind 2 questions. If you don't mind.

1- Were all 3 engines right hand rotating? I'd have thought that at least one was a left hand rotating engine. But then thinking has not always been my strong suit.

2 - In general what was done to the Packards to raise HP from 1200 in early configurations to 1500 by wars end? Supercharger added?

Rick Schaefer
Splinter PT 63

TM2c John E Mirus
Solomon Islands
Dec 43 - Jan 45

Posted By: rickas | Posted on: May 18, 2015 - 6:10pm
Total Posts: 82 | Joined: Dec 26, 2013 - 5:16pm

Rick
Yes all three of the Packards were right hand rotation. The change in the hp was the gear ratio in the supercharger,



Posted By: RANDY SMITH | Posted on: May 18, 2015 - 7:46pm
Total Posts: 182 | Joined: Jul 16, 2012 - 7:16pm

Randy;
Once you guys get the test equipment sorted out you will get the readings you want, charge on....move forward! Easy day you guy got this!
Take care,
TED



Posted By: TED WALTHER | Posted on: May 18, 2015 - 7:54pm
Total Posts: 3059 | Joined: Oct 16, 2006 - 7:42am