Hi

 

We all get told to take it easy with a new engine etc, for so many thousand miles right?

 

What're people's opinions on this method? :wack: http://www.mototuneusa.com/break_in_secrets.htm ie giving it a little stick to bed the rings in better.

 

I hear it's a pretty well established technique. It's a fair read but v interesting.

 

Cheers

 

Pete

Hi Pete

I read an artlicle on 300s not so long ago on one of the links from this site, it went on to say one of the foreign markets where the speed limit is unrestricted (I cant remember which) had cars that were run in before they were shipped, part of the run in schedule was running at about six thousand revs for several hours, and this was done by Nissan!.

I have been advised by several mechanics to give a new engine a good bit of throttle as it helps the rings bed in, and this corresponds with the article you've found,

This is obviously a different situation, but worth noting, my other halfs dad got a new long distance truck the other month and the owners told him to over rev it to bed it in, this is what they are advised from the manufacturers.

 

Anyway good thread lets see where it goes.

As Dave says, all Europe-bound Z32s were run an max speed on the dyno before leaving the factory.

 

This was supposedly in preparation for higher speeds in Europe, particularly on the German Autobahns.

 

Richard :)

When I was runing in my engine I searched the internet quite a lot.

 

You are meant to take it easy on the engine but being too easy for too long makes it worse.

 

I read an article on the net where a person let his mechanic drive his car while it only had 500 miles on it. The owner was quite surprised then the mechanic floored it to about 4000 rpm and let off. All the time this person was never going over 2000rpm. As more miles get on the engine the more you can floor it.

 

 

I spoke to the engineer who bored the block and I asked him if 3000 miles run in was enough. He shook his head and said 2000miles. If its not worn in by 2000 miles its not going to.

 

I started accelerating half throttle to about 4000-4500 after about 500-600 miles.

 

Seems to have worked. :D

interesting topic.

 

I've read the article of "motoman" before and he may have a very good point.

 

I recently had to replace the heads of an engine that was rebuild 2 years ago and it was run in the traditional way.

The interesting thing was that you could still see the honing marks on the cylinder walls.

So no way the rings could have been sealing 100%

 

>>all Europe-bound Z32s were run an max speed on the dyno before leaving the factory.

 

where does it say this ? I never heard about this before ?

I've heard taking it to the red line a few times in lower gears without the engine under full load is a good thing - stops the bores glazing.

 

'Grannying' for 600 miles is not a good thing.

 

It's full throttle in high gears at low revs you should avoid at first.

 

A mate got his (bike) engine run in on a dyno recently - dunno if that's a good thing or not though.

 

IMO anyway!

To be truthful I think I actually did a hard pull off in 1st 2nd and most of 3rd when the engine only had 400 miles on it I think.

 

Its true what he says about the rings though. You are basically rubbing the rings down to the same shape as the bore.

so running the car in on a dyno , is this a common practise and is there any bad points doing it on a zed??

was wonder in this my self.. just finished buildin my thengine bk up! consists of sum nice 88mm wisco pistons and a set of egal fordged rods! amongst some other goodies! i presume that the running in will all be the same for this!!

if it means i can leave my car on a dyno for a few hours instead of having to drive 1000 miles then bring it on !!! But would like an expert opinion 1st please !!

interesting topic.

 

I've read the article of "motoman" before and he may have a very good point.

 

I recently had to replace the heads of an engine that was rebuild 2 years ago and it was run in the traditional way.

The interesting thing was that you could still see the honing marks on the cylinder walls.

So no way the rings could have been sealing 100%

 

>>all Europe-bound Z32s were run an max speed on the dyno before leaving the factory.

 

where does it say this ? I never heard about this before ?

 

all europe bound cars--ie z32 were tested on a rolling road dynamometer at the production line,this was carried out at the nissan shatai in hiratsuka city and was run up to max speed and rpm for a period of 50-60 mins,this testing program was aimed at cars that would probally end up on the german autobahns ;)

all europe bound cars--ie z32 were tested on a rolling road dynamometer at the production line,this was carried out at the nissan shatai in hiratsuka city and was run up to max speed and rpm for a period of 50-60 mins,this testing program was aimed at cars that would probally end up on the german autobahns ;)

 

 

Where have you got this information from?

 

You mean my Z has been on a rolling road at redline in 5th (186mph) for an hour?

 

Personally I dont see how the engine could take that abuse.!

Where have you got this information from?

 

You mean my Z has been on a rolling road at redline in 5th (186mph) for an hour?

 

Personally I dont see how the engine could take that abuse.!

 

The 300zx enthusiast manual mentions something about this, and shows a pic of zed on the dyno, but I dont have the book with me at the moment to read full details, somebody else must have.

 

although the car in the picture seems to be a swb zed, which were never sold in Europe ?

Where have you got this information from?

 

You mean my Z has been on a rolling road at redline in 5th (186mph) for an hour?

 

Personally I dont see how the engine could take that abuse.!

 

186 mph, wow i nearlly forgot the reason i bought my zeds :rofl: :rofl:

so running the car in on a dyno , is this a common practise and is there any bad points doing it on a zed??

 

I've only heard of it done once and that was on a motorbike.

 

I'd trust that particular dyno man totaly but I have no knowledge of it being done on a car - don't see why not though if the bloke knows what he's doing.