Velocity stack testing!, Been playing on the dyno again! |
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Velocity stack testing!, Been playing on the dyno again! |
Jake Raby |
Nov 9 2004, 04:29 PM
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#1
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Yep,
Remember the posts about URY and his "too tall" stacks?? I decided to post the data from my latest engine combo as i try to find the perfect stack arrangement for it.. Guys wanting a cheaper, reliable TIV engine will love this one because it has a ton of torque and awesome smoothness. It does NOT have ported heads, so its almost 1,000.00 cheaper than some of its bigger brothers and makes torque very similar, but does not have the RPM range.. Ultimate daily drivin, short shiftin, 901 abusin power- plant.. Anyway, look at these plots and descriptions for this engine here http://www.shoptalkforums.com/viewtopic.php?t=80579 I plan on replicating this exact test on the next 10 engines I dyno and see how port work and cam changes effect the results. The results from this engine do not follow suite with my earlier findings, but almost all those tests were done on high revvin engines.... |
Jake Raby |
Nov 9 2004, 04:43 PM
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#2
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Thanks!
Yep, the 6" stacks are all over the place.... Thats what i have seen before, but typically they make a bigger impact up top in the powerband and hurt power more there. My guess is that these test progress to higher tuned engines I will yet again see this. This engine has a slow piston speed, and high velocity heads with a huge split in the duration between intake and exhaust on the cam. The tuning is effecting my results with this one, but thats why I'm doing more of them back to back. The tests are fast and easy because it only takes a few minutes to swap them out and unless they effect jetting no other changes are made.. |
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