quote:Originally posted by Aus Ford:quote:Originally posted by Coolvet:
So what is the solution George? You show a photo of sleeved lifter bores. Please explain what you have done here, why you did it and what the benefit is?
Thanks, I love learning how experts have solved these issues.
This mostly is noticed at high speed above 7000rpm and is probably the cause of all those cleveland spun bearing stories i'm sure you have heard. I'm in Sydney too and i've heard a million.
I'm in NY and have heard of zero. I go back quite a ways with cars and with these engines.
They were run in Pro Stock drag racing and NASCAR in the early 70s.
When you go racing, it is common sense that production based engines are going to show their weak spots at racing conditions and need modifications.
This does not mean they have inferior designs or have major oversights. Just means there are additional solutions required to extend their dependable operating ranges.
Virtually every US production based race engine has needed high speed durability improvements.
The Cleveland is no worse or better than the others.
Over oiling was identified by many virtually as soon as the engine became available and certainly apparent under race conditions.
Jack Rousche talked about it briefly in an article he wrote for Hot Rod Magazine in 1972. "Pro-fecting the 351c". This really is old news.
The necessity to supply adequate oil to pressurize hydraulic lifters is what created the over oiling situation for race cars that need extended durability. I suppose you could say that not offering two different blocks, one for hydraulic lifters and one for solids is or creates the issue?
The Cleveland and the 427 Ford have certain similarities in a sense. Both have such potential as an above 7,000 rpm race engine and yet both had issues above it.
The 427 block eventually wound up as having an additional external oiling gallery added to the casting in order to make it a priority oiler. That block has been nicknamed the side oiler.
I for one don't feel I need to be warned about going over 7,000 rpm with any of these engines. There in fact are many things that can fail then and if you go over and it breaks I'm sure I can find someone who will say, "see, I told you so".
Thank you for your caution on this anyway, even as a just in case you didnt know warning...
