Opinions on these compression and leadown numbers - Please

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ferrari_cavallino
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Location: Nashville, TN

Opinions on these compression and leadown numbers - Please

Post by ferrari_cavallino »

Cylinder Compression Leakdown
1 135
2 137
3 133 16%
4 144
5 118 24%
6 140
7 145
8 110 42%
9 160
10 142
11 155
12 162

Please any thoughts or comments or what would need to be done.
I have read tolerances should be between 10 and this one if of that mark.

Doug
John Se
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Post by John Se »

Rates seem very reasonable these days!
:o
andrew
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Post by andrew »

What is the source of the leakdown percentages (intake valve, exhaust valve, or crankcase)? Also, what are the other leakdown percentages?
'64 330 America s/n 5109
ferrari_cavallino
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Location: Nashville, TN

more detail

Post by ferrari_cavallino »

they only did leakdown on cylinders with low compression

cylinder compression leakdown
3 133 16% rings and intake
5 118 24% rings and intake
8 110 42% intake
Sleeper
Posts: 75
Joined: Sat Dec 21, 2002 10:33 pm

Post by Sleeper »

These are better numbers than my car. Does the car run OK? If it does why do anything? My car runs good and doesn't smoke so what is the problem exactly?
Rudy van Daalen Wetters
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Post by Rudy van Daalen Wetters »

Doing the leakdown on only the low cylinders is like a dentist checking only the teeth with fillings. See if you can get all the cylinders checked as they should be. Perhaps you could then post the results.


Rudy van Daalen Wetters
1963 GTE s/n 4001
1966 330 GT s/n 8705
zac
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Post by zac »

does the idle change if you remove the #8 plug wire?

I would guess that from just seeing the numbers that you are probably running on 11 1/2 cylinders.

Are you purchasing the car or is this a car you allready own?

My best advise on this one would be to find a shop well reccomended and compitant and trust the advise they give you on this matter.

These results are exactly why you have compression and leakdown test done, to detect and prvent major mechanicle failures before they happen. Unfortunately the news can't always be good and it is best to listen to what your car is telling you.

Zac
1970 365 gt 2+2 13137, 1997 550 Maranello, 1969 Lamborghini Miura S, 1973 365 GTB/4 Daytona
ferrari_cavallino
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More Info

Post by ferrari_cavallino »

This is a car I am looking at purchasing

Norwood Performance is doing the PPI
330Jim
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Post by 330Jim »

Cylinders 3 and 5 are not that good but may be able to live with them. Cylinder 8 has one of the following problems, leaking head gasket, bad pistons rings and / or damaged valve. When the leakage test is being done if you can hear a hissing noise in the exhaust, the exhaust valve is bad. If you hear hissing in the carb the intake valve is bad. If you hear the noise in the oil cap then the rings are bad. If none of these work remove the radiator cap, if the water level raises after a few minutes the head gasket is shot. Any way you look at it the engine is going to need some major work.

Cheers Jim
66 330GT 2+2
David Hodge
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leaks

Post by David Hodge »

is that why i've seen stethocopes in tool chests? to listen for the location of the leaking air? i would guess not that subtle of a hiss but then again i've never seen a leak down test.
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tyang
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Post by tyang »

Hi David,

The hiss is pretty pronounced when there is a problem. The stethescopes work well for hearing a bad lifter or valve tap when the engine is running.

Tom
'63 330 America #5053
xs10shl
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Post by xs10shl »

Is the car run frequently? If not, then a possible cheap alternative to a valve job is to throw a can of Sea Foam in the gas tank, and another in the sump. Drive for 400 miles and re-test. Your numbers may improve slightly, and you'll have a fun time doing it.

As it is now, I'd agree with previous posts that you're buying an 11 1/2 cylinder Ferrari, which may need work in short order. Nothing wrong with that - I've got an 11 cylinder Ferrari myself - it ran fine until recently, when it started smoking like crazy.
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