FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: blykins on January 31, 2015, 08:01:45 AM
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Finally got the last iteration of Gary's Tunnel Port motor finished and dyno'd. It was a 600 hp engine before, with the heads used as Gary sent them. They flowed decent, around 340, but didn't have any velocity and petered out at around .600" lift.
We decided for the sake of data that we would try something a little different, so I sent the heads and intake to Lawes Mayfield to have them ported. He raised the floors in both the intake and head and increased the flow by another 40 cfm....380 cfm TP heads, with a smaller CSA than the factory designed them to be.
I changed the camshaft around a little too. Kept the same .050" duration, but added a lot of lift, about .150" more than before. Widened the LSA by 2 degrees as well.
I hated that we changed so many variables at once, but I know Gary didn't want this to be a dyno queen all its life. In addition to the head/intake/cam work, we also added some RaceTec domed pistons, which bumped the compression ratio up from 10:1 to 12:1, and rebalanced the crank.
The engine responded much, much better than I ever expected. On the very first pull to 5200, it made the 600 hp that the last iteration made at full song. Further tuning and pulling to 7000 saw a peak hp of 696 @ 6700. Torque was 589 lb-ft. :)
(http://i170.photobucket.com/albums/u267/shellvalleyowner/photo3_zpsaa888fbc.jpg)
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Cool motor, and it is interesting that it made nearly the exact same power level as Rob D's tunnel port made when he and Blair were at my place dynoing that one. Love that water pump setup ;D
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Didn't have any issues out of the water pump Jay....adapters are nice pieces. :)
What was Rob's TP specs?
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Here's a link:
http://fepower.net/simplemachinesforum/index.php?topic=726.0
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30 cubes is plenty to make up for. The stroke difference can be seen in the torque, but it's interesting to see the other variations that make up for the equal horsepower between both those tunnelports.
Nice solid build, Brent. Looks good too....the engine, that is ;D
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Ordered a new set of pistons today.
We are adding stroke and about 46 cubes. 8)
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Cool! I'm guessing 755 HP @ 6500 RPM.
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I figure it will be somewhere around the 760 hp mark. I'm adding some duration to help offset the cube bump. Keeping the same compression ratio, heads/intake are staying the same, etc.