Originally Posted by
bigmatt
I did email mark at massive mods, he thinks it's a tight engine. it works fine. no over heating no erratic idle nothing of the sort,If any thing I would say that it was tighter then my other 7 port. I have pretty much chewed up the fly wheel getting it unstuck. so I think I will keep using the mmmods run in oil in 1 more tank of fuel and take it slow on the break in. but I know I read some where the same problem and that ended in a broken rod and crank pin. and I am trying to remember but I think with the engine being so tight the census was he should have used the heat gun to warm up every time during break in. If I remember right.
Hey All
Yes id say its happening because its tight provided the sound is coming from the engine. One thing that people MUST understand is that engines do not like being run in on a bench. Its what will shorten the life of an engine every time. I know people will tell you differently based on their experience, but on a law of averages an engine will last longer when you run it nice and hot, i run in about 6 to 12 engines a week and the method i use is to put load on the engine IMMEDIATELY !
Why ?
because this creates heat and heat expands the engine. if the engine dosent expand you are restricting the operation of the engine at its most critical point in its life. What happens is the piston will slam into a tight sleeve at an avearge of 12,000 times a minute ! Thats like taking a jack hammer to the rod and bearing.
The best way to create heat in an engine is to put load onto it .. Start it , idle it for 30 seconds , give it a quick tune to make sure its not too lean or rich , then put it on the ground on high traction surface and drive it. Dont baby it and dont abuse it. Gradually increase the rpm with every tank.
By the time you hit the litre mark ( quart for the imperially impared ) you should be giving the engine some stick !
Running an engine cold on a bench will give you no end to grief later in its life.
Cheers MM