What do you think of these compression numbers?

[Wesman07]

I got this motor from a friend who said it was out of a van with under 100,000 miles on it. I have put on at least another 90-100 k on it. So I figured I should see what condition its in.


cylinder# 6 150 Dry 160 Wet
cylinder# 5 152 Dry 170 Wet
cylinder# 4 155 Dry 160 Wet
cylinder# 3 150 Dry 150 Wet
cylinder# 2 170 Dry 170 Wet
cylinder# 1 152 Dry 160 Wet

[B RON CO]

Hi, I'd say the numbers are pretty good. Why are you concerned?

[Rusty_Old_F250]

That's ready for another 100,000

Sam

[Wesman07]

I was thinking about switching the stock cam for a crane 901, but I did not know the condition of this engine.

What is a fresh motor in stock form supposed to put out?

[B RON CO]

Hi, If that was mine I would think about giving it rings and bearings, with a light hone and plasti gauge the crank. Along with going over the head. Good luck

[tom954x4]

Hi Wesman07,
If you have an analog gauge, what oil pressure are you seeing at cruise and hot idle?

[Wesman07]

I don't know what my oil pressure is but I know the pump is new.

I think I'll save the new cam for a fresh motor and just advance this one

[pmuller9]

I think I'll save the new cam for a fresh motor and just advance this one

What are you going to use to advance the cam?

[Wesman07]

A cloyes timing set. Is there another option?

[pmuller9]

A cloyes timing set. Is there another option?

Mr Gasket 987G offset cam key.
It will get you 4 degrees at the crank when you use it with the cam gear.

The Mr Gasket 988G will get you 8 degrees at the crank when used with the cam gear

[Wesman07]

You would recommend degreeing the original gears over replacing the set?

I would imagine that would be a heck of a lot easier to do, but shouldn't I be concerned about the fiber gear?

Also, how much should I go? Aren't there diminishing returns after a certain point?

[pmuller9]

You would recommend degreeing the original gears over replacing the set?

I would imagine that would be a heck of a lot easier to do, but shouldn't I be concerned about the fiber gear?

Also, how much should I go? Aren't there diminishing returns after a certain point?

You are right concerning replacing the fiber gear.
I would get a steel replacement set and use the offset key.
I'm not real confident with the Cloyes aluminum cam gear either. There have been a few here that have had noise problems.

I would go 4 degrees advance. If you go 8 then you lose some horsepower but more importantly the engine becomes more prone to detonation.