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What do you think of these compression numbers?

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Wesman07
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What do you think of these compression numbers?

Post #1 by Wesman07 » Sat Feb 04, 2017 3:03 pm

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
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86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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B RON CO
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Re: What do you think of these compression numbers?

Post #2 by B RON CO » Sat Feb 04, 2017 3:46 pm

Hi, I'd say the numbers are pretty good. Why are you concerned?
B RON CO. Still workin' on it!

1933 Ford Pickup - 59A Flathead V8
1966 Ford Bronco - U14 - 170/200 Straight 6
1966 Ford Mustang - 289 V8

Rusty_Old_F250
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Re: What do you think of these compression numbers?

Post #3 by Rusty_Old_F250 » Sat Feb 04, 2017 3:57 pm

That's ready for another 100,000

Sam

Wesman07
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Re: What do you think of these compression numbers?

Post #4 by Wesman07 » Sat Feb 04, 2017 10:50 pm

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?
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86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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B RON CO
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Re: What do you think of these compression numbers?

Post #5 by B RON CO » Sun Feb 05, 2017 9:20 am

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
B RON CO. Still workin' on it!

1933 Ford Pickup - 59A Flathead V8
1966 Ford Bronco - U14 - 170/200 Straight 6
1966 Ford Mustang - 289 V8

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tom954x4
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Re: What do you think of these compression numbers?

Post #6 by tom954x4 » Sun Feb 05, 2017 2:46 pm

Hi Wesman07,
If you have an analog gauge, what oil pressure are you seeing at cruise and hot idle?
1995 F-150 XL, 300-6, 4x4, ex-cab, sb, 3.08 5-speed, 2 1/2 in. exhaust w/flowmaster 50, MSDignition failed with no warning, now out, canopy, 179,000 + miles. Gone but not forgotten 1965 F-100 240 3spd lwb "the green hornet"; 1960 F-250 4x4, 223 six, 4sp with wrap-around rear window, two-tone paint, overhead camper.
Tow vehicle: 2012 F-250 4x4 6.7 diesel XLT s/c lwb

Wesman07
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Re: What do you think of these compression numbers?

Post #7 by Wesman07 » Sun Feb 05, 2017 7:41 pm

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
In-lines we trust

86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

pmuller9
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Re: What do you think of these compression numbers?

Post #8 by pmuller9 » Sun Feb 05, 2017 7:54 pm

Wesman07 wrote: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
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Re: What do you think of these compression numbers?

Post #9 by Wesman07 » Sun Feb 05, 2017 9:45 pm

A cloyes timing set. Is there another option?
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86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

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Re: What do you think of these compression numbers?

Post #10 by pmuller9 » Sun Feb 05, 2017 10:29 pm

Wesman07 wrote: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
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Re: What do you think of these compression numbers?

Post #11 by Wesman07 » Mon Feb 06, 2017 5:29 am

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?
In-lines we trust

86 f150 300 efi with advanced stock cam. Np435, Dana 60/ 10.25, 35" BFG's, four link front suspension with 12" travel fox coil overs, custom deaver leaf pack in the rear.

pmuller9
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Location: Columbus, Indiana

Re: What do you think of these compression numbers?

Post #12 by pmuller9 » Tue Feb 07, 2017 6:08 pm

Wesman07 wrote: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.

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