engine rebuild, running in help?
Discussion
trefor said:
Most engines run at 90 deg anyway. Each engine has a different optimum temp, but I bet it's not far off 90deg in most cases.
Mine's very dependent on ambient temp - at the moment it's in the 70-80 region (unless stuck in traffic jam). However on that very hot Sunday it was 90-92 all the way, regardless of speed.
I used to run my cars and bikes in really gently as well but I did gradually up the revs and increase the load for short periods. Now I'm not sure how I will do it next time round. Breaking a camshaft in should be done at a few thousand revs IIRC from startup for 15-20 minutes.
I read a really good motor bike link suggesting you thrash the nuts off the engine fairly early. This was backed up by dyno evidence. They also said that when a bike is at the end of the production line the japs fire it up and rev it to red line to see if anything breaks. They know that after that the bike will be fine. It's suggested that the Jap companies might suggest riding slowly to make sure you don't stuff it just after you get it and also to make sure the bike passes it's warranty period. Oh, there's money to be made from servicing as well. I was very sceptical until I read the information. Not sure about thrashing my moly rings though. Here's the link:
http://mototuneusa.com/thanx.htm
It's bound to be controversial
I read a really good motor bike link suggesting you thrash the nuts off the engine fairly early. This was backed up by dyno evidence. They also said that when a bike is at the end of the production line the japs fire it up and rev it to red line to see if anything breaks. They know that after that the bike will be fine. It's suggested that the Jap companies might suggest riding slowly to make sure you don't stuff it just after you get it and also to make sure the bike passes it's warranty period. Oh, there's money to be made from servicing as well. I was very sceptical until I read the information. Not sure about thrashing my moly rings though. Here's the link:
http://mototuneusa.com/thanx.htm
It's bound to be controversial
Went for the easy option of getting it run-in on the bench dyno, under varying loads. So much more satisfying to be able to check out the results of the rebuild first hand straight away 
.
Agree with cams 20 mins at 2-2.5K, for the engine agree with the not above 3K when warm 2-2.5K when really cold, but do not labour the engine in a high gear this is just as bad if not worse than over revving IMHO.
Harry
. Agree with cams 20 mins at 2-2.5K, for the engine agree with the not above 3K when warm 2-2.5K when really cold, but do not labour the engine in a high gear this is just as bad if not worse than over revving IMHO.
Harry
Good link. I've heard that a hard break-in is as good, or better, than the conventional easy-on-it one. I've never heard a good explanation (or had the balls to try it myself). He makes some good points, I just might try one like that next time.
Of course, I think his advice is more aimed towards brand-new motorbikes, which likely have better materials and machining than a 10+ year old chev (or rover/tvr/lotus/ford/whatever) block would.
Interesting reading in any case.
Of course, I think his advice is more aimed towards brand-new motorbikes, which likely have better materials and machining than a 10+ year old chev (or rover/tvr/lotus/ford/whatever) block would.
Interesting reading in any case.
Boosted LS1 said:
I used to run my cars and bikes in really gently as well but I did gradually up the revs and increase the load for short periods. Now I'm not sure how I will do it next time round. Breaking a camshaft in should be done at a few thousand revs IIRC from startup for 15-20 minutes.
I read a really good motor bike link suggesting you thrash the nuts off the engine fairly early. This was backed up by dyno evidence. They also said that when a bike is at the end of the production line the japs fire it up and rev it to red line to see if anything breaks. They know that after that the bike will be fine. It's suggested that the Jap companies might suggest riding slowly to make sure you don't stuff it just after you get it and also to make sure the bike passes it's warranty period. Oh, there's money to be made from servicing as well. I was very sceptical until I read the information. Not sure about thrashing my moly rings though. Here's the link:
http://mototuneusa.com/thanx.htm
It's bound to be controversial
I am keeping it at or below 2500 rpm for 500 miles. Done some country roads, A roads and some motorway so far.
Spent most of the time between 2-2.5k, trying to vary the speed and rpm but tough on the motorway. The motorway is a nightmare, can only do 65 so not tickets for me.
Looking forward to the next 500 miles, told I can then take it to 4-4.5k
Spent most of the time between 2-2.5k, trying to vary the speed and rpm but tough on the motorway. The motorway is a nightmare, can only do 65 so not tickets for me.
Looking forward to the next 500 miles, told I can then take it to 4-4.5k
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