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post #1 of 7 (permalink) Old 01-05-2017, 07:20 AM Thread Starter
johnykalbo
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RPM Question

I have gotten into the habit of driving in first gear and reeving often up to 5k plus. Is this bad for the engine and I should stop doing it? How much can a engine handle and not affect life of the engine and such? Is there a difference in affect on the engine if your high RPM in lower gears compared to higher gears?

Thanks for any feedback.
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post #2 of 7 (permalink) Old 01-05-2017, 11:03 AM
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Unless you're racing from a stop every single time there's no reason to. Of course its harder on the car than not doing it.

It's like asking if every time you stop moving you can sprint to get going again instead of moving at the required pace. Sure it'll work but its not necessarily practical, efficient or necessary.
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post #3 of 7 (permalink) Old 01-05-2017, 01:19 PM
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Quote:
Originally Posted by johnykalbo View Post
I have gotten into the habit of driving in first gear and reeving often up to 5k plus. Is this bad for the engine and I should stop doing it?
The only thing it will hurt is your gas mileage..
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post #4 of 7 (permalink) Old 01-05-2017, 01:39 PM
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Originally Posted by arathol View Post
The only thing it will hurt is your gas mileage..
Pretty much....this. ^^^

5K is just past where you hit max hp, so it`s when the vehicle is least fuel efficient. It`s not so much RPM that stresses an engine, it`s the load. Flooring it in 6th at low rpm is actually more stressful for your engine.
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post #5 of 7 (permalink) Old 01-05-2017, 01:48 PM
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As long as you don't do it when you first start driving while the engine is still cold

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post #6 of 7 (permalink) Old 01-05-2017, 06:15 PM Thread Starter
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Happy to hear, love driving this way and will be excellent once I get my intake and exhaust, though there is a problem with shipping, new import restrictions or some dumb thing but I will make it happen, will just take a month or so longer, Damn!!!!
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post #7 of 7 (permalink) Old 01-21-2017, 09:44 PM
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The keys to proper engine break in, IMO, include not using cruise control, not nearing redline unless you motor is fully warmed up, varying your RPM's, and using compression braking to slow you down. If you want to know more, read on. If this seems overkill, no need to read more.

Regarding engine compression braking, one of the ways to best seat your piston rings is to raise your RPM's from 2,000 to 4,000 RPM's, then let the motor's compression alone slow you down. This results in the engine compression forcing the rings firmly against the cyclinder walls, creating the best possible wearing down of fractional high and low spots so that the piston rings seat fully and firmly against the walls.

By best seating/sealing your piston rings, lots of positive things happen including best compression -- which results in the most power, least oil blowby/oil usage, and as a result of the above, best fuel mileage no matter how you drive your car.

Specifically, I progressively raise the RPM range (again once my motor is warmed up), throughout the manufacturer's break in mileage recommendation. For example for the first few hundred miles I will in third gear for the first 300 miles, take the RPM's up to 4,000 RPM, letting engine compression slow me back down to 2,000 RPM's, but for the last half of the manufacturer recommended break in period, would take the RPM's up to 5,000 RPMs, then letting the engine compression brake me down to 3,000 RPM's. And toward the very end of break in period, would take my motor up to 500 RPM's below redline, then using engine compression braking, have it reduce my RPM's the same 2,000 RPM's.

Some will say "what a pain in the neck" the above regimen is. But doing this rev raising/engine compression braking process, which takes all of 30-40 seconds once every 15 minutes for the first 600 miles has never let me down, including never having an motor issue in 2,000,000+ miles, and only on one motor years ago, ever needing to add a quart of oil between manufacturer recommended oil changes.
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Last edited by Road Trip; 01-21-2017 at 09:48 PM.
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