Re: {Chrysler 300} Compression Test - 413

[John Grady <jkg@xxxxxxxxxxxxxxxxx>]

That’s perfect . Don’t rebuild your motor for nothing !

So many in club do , can cause way more trouble than help — so dependent on skill of machinist . One of 100 ‘s of possible errors, you own it . Been there . 

If you really want an accurate test , drive at least 30-40 miles and do it . But why if running ok? 

It is normal for variations to happen in ring seal etc at slow crank . Unless using a lot of oil or there is  antifreeze in the oil , or something broken leave it alone . 

A bad valve would drop one cylinder a lot .a bad cylinder would repetitively foul a plug and burn oil . 

Remember Jerry Kocur ? 330 k(?) on first 413 , another 300 k on second build .

392 were known to hit 300 . Mileage is the parameter if no oil burn .Even then a timing chain ( check) and reseal leaks would come first 

I have had two Jeep 4.0 go over 300 , one I have now at 280 k uses no oil ( mobil one) between 10 k mile changes . I read research by  SAE on oil durability , they used 350 chev . They kept running it ( various kinds) and doing careful lab tests every 1 k or so — NO degradation of Mobil one at 17000 miles . Frequent oil changes sell oil and make profitable work  .  And at 17 k it was a slow decrease in additives.  The AMC 4.0 series are great motors like the slant six , although chrysler messed them up in 2000-2002 with a bad “new design”  head castings ( crack) and cheap pistons (skirts break off) 

Get involved with mechanics , what needs rebuilding is your wallet . 

Mho John 

Sent from my iPhone

On Sep 3, 2022, at 9:17 PM, Nick Taylor <nicksgaragesd@xxxxxxxxx> wrote:



That's way better than the results from my 60 New Yorker wagon.

On Sat, Sep 3, 2022, 5:11 PM 'Matt Allyn' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Because it was so nice & cool outside today, here in So. Cal….

I decided to run a compression test on my 1962 413, aged, motor.

I know I should have done it after the motor was warmed up; but I did it cold, so this may be a fail.

I found the findings interesting, just the same:

DRIVERS:

1 - 150

3 - 155

5 - 170

7 - 150

PASSENGER:

2 - 145

4 - 150

6 - 170

8 - 130

Things are not looking up for this old block!

I reckon it's time to pull it out & refresh it.

Now it’s time for a drink!

Matt Allyn

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