Running an Engine in. - Toyota Nation Forum : Toyota Car and Truck Forums

JetspeedCamry · 04-08-2005, 07:54 PM

Found this article about running an engine in for the first time.

Very different to my previous thoughts on how to do it...the opposite in fact, but makes alot of sense.

Anyone had experiences with this? Or ideas etc.

http://www.mototuneusa.com/break_in_secrets.htm

alltrac165 · 04-08-2005, 09:37 PM

http://www.toyotanation.com/forum/se...earchid=117632

JetspeedCamry · 04-09-2005, 02:45 AM

Quote:

Originally Posted by alltrac165

http://www.toyotanation.com/forum/se...earchid=117632

Your posts point?? That search did not return any matches.....

flex-appeal · 04-09-2005, 07:55 AM

Thats odd, the link worked fine for me yesterday and showed some postings. I just tried it again now and, as you said, no matches...

Incidentally, I read that page and it reminded me of the haynes method for breaking in the engine , i.e (if i remember correctly

)

warmup engine
drive along slowly,
floor it and accellerate with full throttle until 50mph,
release throttle and allow car to slow down with engine braking only

repeat a few times

CrawlingEye · 04-09-2005, 12:31 PM

It seems quite logical to me. You'd be putting more pressure on the piston rings and realistically and mechanical 'off-specification' will hurt the engine no matter how slow/fast you're going so easy-breakin seems odd.

I didn't quite understand his statement about synthetic oils though. I guess he wants dino because of the fact that synthetic's so thin and has so many cleaning agents in it.

SmokingTires · 04-09-2005, 03:55 PM

What engine brake are you talking about? The only thing that has a real engine brake are Diesel engines. They use the cylinder as an air compressor in order to slow the vehicle. However your not talking about a diesel, so I am interested in hearing of this "engine brake"....

JetspeedCamry · 04-09-2005, 08:26 PM

I think the term engine braking for a normal petrol engine means decelerating to a stop without using your brakes, possibly also shifting down the gear at appropriate points. I do this if i have to stop quicker at a set of lights, apply brakes and down shift to second, slows me up a bit quicker.

SmokingTires · 04-09-2005, 10:35 PM

But kills your tranny

alltrac165 · 04-10-2005, 12:25 AM

dunno what happened to that link, timed out maybe? Anyway search for "mototune" and there's about 3 or 4 threads on this very topic.

So downshifting as you slow down, or "engine braking", is bad for the tranny? I didn't know that. Does it wear gears the wrong way or something?

SmokingTires · 04-10-2005, 01:25 AM

Quote:

Originally Posted by alltrac165

dunno what happened to that link, timed out maybe? Anyway search for "mototune" and there's about 3 or 4 threads on this very topic.

So downshifting as you slow down, or "engine braking", is bad for the tranny? I didn't know that. Does it wear gears the wrong way or something?

If you use it to slow down in an Auto (dropping it into Low while going 40mph), it beats on the tranny and the engine. Not good for it at all.

Manual trannys you can shift through as you slow. You can also shift up a gear and it will slow you because of the lack of torque. It's not as bad for a manual because the engine is made to be shifted by you.

Autos aren't ready for it. They shift down themselves at the proper time.

flex-appeal · 04-10-2005, 06:17 AM

Engine braking doesnt usually refer to downshifting. Think of it this way,

while you are using the throttle, the engine is turning the wheels

when you release the throttle (if the vehicle is moving), the wheels are turning the engine

This is why it is referred to as engine braking, im surprised you havent heard of it. You can do this on any vehicle, although if the force required to turn the engine (compression of the engine factors in here) is greater than the friction between the tyres and the road , then you skid. Try it on a motorbike and you'll see what i mean. I hope this has cleared it up for you SmokingTyres.

SmokingTires · 04-10-2005, 03:29 PM

It's not engine braking.... There is only one true engine braking as I refered to above. It's called Jake Braking. And it's only used on Diesels.... I worked in a diesel shop for a year, I know this for fact.

flex-appeal · 04-10-2005, 09:06 PM

Well you've got a point.. I use the term engine braking because i've heard other people here use that term. perhaps there is a different term used for it in the US? I'd be curious to know what it is, for future reference.

hotrodat18 · 04-28-2005, 10:34 PM

This is all pretty petty but if you both want to get technical, here is the definition out of ASE's automotive dictionary I recieved in tech school about 15 years ago, (brake)-"A devise for slowing or stopping motion." (braking)-"To reduce the speed of a vehicle with a break." The point is, that anything that will slow the motion of a moving object is a brake whether it is friction or compression it is a break. If an engine while decellerating is slowing the vehicle it is an engine brake. By the way the only reason why tractors (diesels) have jake brakes is because the engines have to much compression and the rigs are to heavy when loaded.
If the trucks could not release the compression they would break something in the drive train or blow a head gasket, break a rod, or maybe a piston. Auto's don't have this delima or they would be equipped with a jake brake devise as well. Not to mention that it saves tractors a ton of wear on their frictional break pads because the loads they carry. By the way you are right about the downshifting though, it's alright on a standard but not recommended for an automatic. It builds to much pressure in the pump and valve body, not to mention the physical wear on the internal clutches and gear component. Hope this helped.

PS. The reason why the decell helps with break in is because the rings start to bevil one way under power and with the heavy decell it helps keep the bevil even on top and bottom.

hotrodat18