Originally Posted By: racin4ds
Originally Posted By: meborder
as best i know, the competition is a 35 minute dyno session where the competitors are allowed to make as many dyno pulls as they can/want to.
most competitors will pull the engine to redline, change some parameter hoping to pick up a couple numbers and repeat.
while i don't know how many pulls one can make in 35 minutes, i'd have to imagine that repeatedly pulling the engine to redline on a dyno isn't the easiest thing on oil; unlike drag racing where one makes one pass (less than 10 sec. at these power levels), and lets things cool down.
i wonder how many drag racers would run 5w20 in their 700hp drag car...
Exactly! You won't find any 5w20 water in any race engine anywhere that I know of... thin stuff is only used for qualifying or all out max HP pulls on the dyno
I thought that some of the NHRA/IHRA Pro Stockers were using oils at least
labelled as xW-20 weights?
Now whether or not they actually have HTHSVs of an API 20 weight or not is a whole other question (and they do not have to worry about NITROmehthane fuel dilution like the top fuel peeps do, or even quite as much fuel dilution period as those clasees).
Of course this is 1/4 mile racing, and IF you are talking about;
road/endurance/roundy-round, or rallying, then I could not agree with you more.