What is Considered Low RPM Driving?
03-15-2019, 08:52 PM
#1
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What is Considered Low RPM Driving?
The bore scoring video had suggested that one hypothetical reason for bore scoring was low RPM operation. Something like piston rod angle if I recall. So, what is considered low RPM driving? My manual suggests shift points at 3K RPM. What about cruising RPM? Under 3K? Over 3K? Just curious about others opinions. I have a hard time shifting at 3K BTW. Usually 4K and over.
Thanks,
Kyle
Thanks,
Kyle
03-15-2019, 08:55 PM
#2
Rennlist Member
I recall a post by a respected member of the forum noting don't drive above 3k RPM when cold and not below 3k RPM when warm...I subscribe...and don't give a rip about the gas mileage.
03-15-2019, 10:44 PM
#5
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And avoid cruising at 2200-2400 rpm.
03-16-2019, 06:31 PM
#6
I don’t believe there is a problem cruising at 2200-2400 RPM steady state on the highway in sixth gear (engine warmed up) if the road is flat or with a downward incline. There is virtually zero load on the engine.
03-16-2019, 06:59 PM
#7
Rennlist Member
The builder of my engine, Flat6Innovations, advises: "This area of the RPM range (2,200-2,400 rpm) is where the most stress is placed on the valve train components due to the variocam arrangement which does cause accelerated wear of some components". So i don't cruise at that range and recommend to others to avoid doing that. Better safe than sorry.
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03-16-2019, 08:18 PM
#8
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I need to make a t-shirt that says "2200- 2400 = DUH-DUH-DUH-DANGER ZONE!"
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AzDropTop (09-04-2019)
03-16-2019, 08:31 PM
#9
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I just put red tape over that section of my tach to remind myself to drive faster.
03-16-2019, 08:37 PM
#10
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you have to remind yourself? 
03-17-2019, 12:08 AM
#11
I'm not convinced. Tips shift at much lower RPM and I don't believe they are more prone to bore scoring.
Last edited by wyovino; 03-17-2019 at 12:35 AM.
03-17-2019, 12:22 AM
#12
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Valve train wear isn't the same as bore scoring.
03-22-2019, 09:30 PM
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So, I've been driving under 3K until it gets to operating temp and over 3k after reaching operating temp for the past two weeks. My mileage has increased by 2 MPG. The higher RPM seems to be more efficient?
03-22-2019, 11:35 PM
#14
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03-23-2019, 10:53 AM
#15
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You should believe! This was discussed (might have been in the IMSB sticky) and explained a few months ago by some of the best in the business.