|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Fig 2 For these runs figures were taken at every 100 rpm but condensed to 200 to save space. Note the increase in output is more toward the top end. This is what would be expected if friction was reduced. |
ROLLER LIFTER DYNO TEST
 This roller cammed road race 5.0 proved to be a good candidate for our oil testing because of it’s good run-to-run repeatability. |
Although intended primarily for a flat tappet engine the next JGR oil test was run on a roller cam enduro road race 5.0 engine courtesy of Kenny Troutman, boss at KT engines in Concord, NC. There was just about enough time to squeak this test in before having to make way for one of KT’s regular customer’s dyno test.
That being the case there was still time to do an average over 5 runs with each oil. Because this engine was very repeatable the tests produced numbers that gave a good confidence level. The results of this test are as per Fig 2 (right).
 Seen here are Kenny Troutman (left) and dirt racer/ tech writer Bob McDonald. Between the two of them they made a speedy installation of the engine on the dyno. |
SUPER DYNO TEST
As you can see, the difference in numbers that we are dealing with here are small. Much as the DTS and Superflow dyno’s that I normally use get the job done for day-to-day testing, I really wanted to test on a low friction engine such as a genuine cup car restrictor plate motor and on a dyno with really up-market capabilities. A call to Lake Speed Jr. at Gibbs requesting further tests on their #1 AVL super dyno with a restrictor plate motor with me sitting in on the test met with a positive response.
I have run a lot of dyno’s in a career spanning over 45 years but never one costing an estimated one and a half million! A modern dyno such as a DTS or a Superflow produces a lot figures per test, which, if printed out in entirety, spans several sheets of paper. The Gibbs was a couple of steps further on in terms of paper consumption. With almost every parameter you can think of being measured at each 50-rpm increment you can image how big regular “before” and “after” charts would be. To save space I have reduced results to just the hp numbers in the 200 rpm increments seen in Fig 3 (next page).
ADVERTISEMENT
