If you are building an engine today (~2023), Professionals are not building Hydraulic FLat Tappet camshaft engines? Don't try?
- Thread starter greymouser7
- Start date
-
That is the most awful smelling stuff!! Must be good!!
Have not read 50+ threads, but professional engine builders have had failures. So it is not break in procedure, wrong oil, heavy springs. It is the lifter quality. I have a set of Crower [ well, they came in a Crower box ] start to fail after a few hundred miles. The lifters were spinning, which can be seen from the wear pattern. They were soft & that was the problem.
Use re-faced factory lifters & you will not have a problem.
Use re-faced factory lifters & you will not have a problem.
Jarlaxle
Well-Known Member
Right now...I am SO happy I have a roller-cam engine in my Duster.
Here's some rollers for a view.
Dan the man
Well-Known Member
I've never seen a roller cam do that. Bad lifter?
TT5.9mag
Two atmospheres are better than one
That cam/lifter set had over 300,000 miles on em. The rocker (stock paddle type) had enough wear that it created a little lash. Hydraulic Rollers HAVE to stay in contact with the lobe, it’s how the ramps are designed. As soon as there is lash the roller beats the **** out of the lobe. And above is the result.
Here's some more roller ideas for anyone. I think Honda uses something similar on their VVT system.
Jarlaxle
Well-Known Member
So...what happened? What is it out of? How many miles on it?
That is out of a BBC, Gen7 engine, 604 cid. This was in what's called a "gen-set", which is a stationary power plant. That would run day and night for years at near 2000 rpm. It had 1.3 million hours on it, which is about the same as 780000 miles.
TT5.9mag
Two atmospheres are better than one
Same engine that the cam came out of from my pics above in post 56. I have a turbocharged gen7 8.1 in my daily with almost 600,000 miles and two more in service at work. One of my favorite engines I’ve ever had. Curious, what rockers are on the stationary gen set engines?
And what did the lifters look like?
Post #55 above.
We're the rollers stuck? If they stop rolling the cam goes flat. Heavy valve springs?
Was it neglected Graham? We have outside contractors on a schedule that maintain our gensets. I would say that looks normal for a million hours?
Jarlaxle
Well-Known Member
SO...it wore out.
It did not have 1.3 million hours on it, that's physically impossible.
Your right. 1 too many zeros. Yes it wore out
I got it now. Yes it was 1.3 million. BUT the equivalent in kilometers as to where this # came from. So yes still about 800000 miles.
6PakBee
Well-Known Member
Good luck finding some of that today.
The newly designed ski jump lobe.
I posted a pic of the frt in the racers forum, I have that one full, never opened. Lol! Have no idea exactly when they stopped sending that with their cam kits.
So, I hotted up these tach/hour meters. The 350 vortec has 11,842 hours AND the gen7 BBC has 29685 hours. At 60 miles an hour for a comparison, IF it ran night and day, that one has 1,781,100 miles on it. So yeah it wore out the cam.
-
