Keeping the engine speed low when driving can save fuel, but does it cause engine damage?
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00:00 Why low revs?
00:30 Four stroke cycle
03:27 Load/Stress
06:45 High load at low revs
10:02 Modified engines
12:05 Long term affects
14:11 My advice
24 Comments
if you want clean valves just use water injection
"Suck, sqeeze, bang, blow". I hate what the internet has done to me.
I just passed in no small part thanks to you. You should have a link where the people you've helped can send you £££.
Suck, squeeze, bang blow? Looks like I'm on a wrong channel…
as much as I dislike electric cars I still believe if the current roads keep doing what they do by forcing stoping each 50m and gas prices go up to a point where it isn;'t worth it im sure that is the best path in city
Suck Squeeze Bang & Blow….everything reminds me of her….
Low rpm is bad
Drive fast. Thank you Richard
please make a bumper sticker that says SUCK SQUEEZE BANG BLOW
Great explanation Richard, and may i add for clarity, that even at low revs (relatively) your engine is spinning like mad thing. Just watch your washing machine spinning at 1,000 revs 😳
The worst case is flooring it in high gear at low revs.
I drive manual, is petrol. Sometimes when the road is flat, indicates to up-shift at 1400rpm. Due to the gearbox ratios that might be idle for the upper speed. 😂 It's a Skoda.
"Bang" does mechanical work on the crank-shaft. It does not create energy. The energy starts in the fuel and is converted to heat and pressure. Energy can be neither created nor destroyed. Sorry, just fundamental physics.
I changed gear at 2000 rpms and settle at 1500 rpms at a cruise, none of my car had problems. If the engine is too cold I tend to keep the engine at 2000 rpms until the car prompts me to change gear. My turbo comes on at 1500 rpms and at times at slower speeds at lower revs my Act is activated.
Also low revs like 1200rpm is a bad resonance frequency. Not good to constantly drive at that rpm, rise it a bit, maybe 1400-1500rpm.
Thank you. I passed today. Your videos have helped me a lot to improve my driving skills. Thanks again.
My daughter bought a petrol Renault Captur 0.9 TCE from my brother in law a few years ago, 30 odd thousand miles , same owner from new, well maintained, well driven, not too many short journeys but brother in law always changed up a gear as soon as possible and when the change indicator advised. No sooner had she bought it and it developed a misfire when cold and stuttering at other times. Had nothing to lose so I took it for a decent run and thrashed it, took it to the red line over and over for the first time in its life and hey presto, started running better, pulling better, misfire gone. Told my daughter to allow it to rev freely when driving it at operating temperature and now it's done about 60k miles without a single issue, never missed a beat! I think that says it all really, I don't think they're engineered to be lugged at low revs, I think the manufacturers have been forced down that path to justify published emissions data and reduce emissions generally but in many cases it's doing more harm than good, unfortunately.
Ooh-er, missus!
0:33 hey dad, can I borrow your thing? I need to make a video!
From what I understand, new drivers are taught to keep it in as high a gear as possible, without the engine struggling. Does this not mean that the engine spends much of its time on the verge of struggling? Is that bad for the engine?
Can i gain permission to paraphrase this video by cutting out the waffle?
I like the way you explain things, you care about making it accessible and understandable for your audience. I found this very interesting and helpful and I feel more empowered with this knowledge. Thank you.
Your way of explaining and picking apart everything in a simple and easy-to-understand manner is masterful. Good job.
Suck, Squeeze, Bang, and Blow….. have almost put my head into a gutter. 🤣🤣🤣
Low revs problem is even more serious in a hybrid car as its engine doesn't always work as much as trad. cars. I found I gotta use Redex cleaner more often to keep my fuel efficiency from drop. Now I almost apply Redex in my every tank of fuel. There was a time I drove to Hull last year and had used me up 80% of my tank. A bottle of Redex applied right before my next trip to Hull and only 50% of my tank is used this time. 30% of my 40L tank = 12L of my fuel saved in the same distance and same speed. And I could just press much less gas to maintain my same speed so I felt my right foot was easier. Now I just don't drive without Redex especially in the winter here. Can't imagine driving without that cleaner when the temperature drops below 0 and massive condensation formed inside my engine.
That was a very clear and concise explanation, thank you!