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Ford 9N, 2N & 8N Discussion Forum
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compression readings

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rodgernbama

03-06-2005 18:58:21




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The compression readings on my 8n are as follows:
#1(dry 90-wet 120) #2(dry 80-wet 115) #3(dry 85- wet 115) #4(dry 90- wet 100). Oil pressure is around 12 psi idling at 25 psi at full throttle. What is normal cylinder pressure? Is it time to rebuild the engine?




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Joe(NYC)

03-06-2005 19:22:11




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 Re: compression readings in reply to rodgernbama, 03-06-2005 18:58:21  
Rodgernbama,
The large difference in compression from dry to wet in cyl 1,2,3 indicates that your rings are either worn out or stuck in place or broken or your cylinder walls possibly scored. Did you do the test after warming the engine first? You should. Is this a new to you 8N? If it has not been used a very long time (years) the rings can get stuck. You may be able to loosen them up by adding a spoonful of marvel mystery oil into each cylinder and let it sit for a few days. Then with the plugs off and ignition off and in NEUTRAL you can turn the engine with the starter a few times around to further loosen them up. This has been discussed here many times. You may have better luck than I had doing this. Good luck. Perhaps you shoulod supply some more information like does it smoke, does it have a lot of blow-by at the oil input tube, does it make any particular noises, does it have good power etc. Armed with more info others may be able to better help you out.

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Dell (WA)

03-06-2005 19:19:54




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 Re: compression readings in reply to rodgernbama, 03-06-2005 18:58:21  
Rodger..... ...Ford compression specs: 90psi dry. Your +30psi gain when wet is semi-indicative of well worn engine which is supported by your 12psi oilpressure at idle. But I'd double check the oilpressure with a NEW oilgauge ($10, cheap).

Questions for you to decide: does it start eazy? Are you always having to changed oil fouled sparkies? Do you have enuff power to do what you need? Does it burn alotta oil? (lotta oil = 1-qt per day) Is it reliable? Do you hear bearing knockin? Yur anssers to these questions can make or break the engine rebuild connundrum. You may have 5yrs of engine life just based upon only yer compression readings.

'course, iff'n yer just dyin' to do an N-Engine rebuild, go ritta'head. I won't stop you..... ..respectfully, Dell

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Rob N Va

03-06-2005 19:10:26




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 Re: compression readings in reply to rodgernbama, 03-06-2005 18:58:21  
Those readings are totally alright. Not perfect, but perfectably acceptable, and probably will be for a long time. If she is running strong and not burning oil, you can't ask for much more than that.

I think 90 psi cylinder pressure is minimum.---Rob



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gahorN

03-07-2005 06:24:34




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 Re: compression readings in reply to Rob N Va, 03-06-2005 19:10:26  
Even if she IS burnin' a bit of oil...oil is cheap...as long as you're not spendin' all your time cleanin' plugs to get it to start I'd keep right on runnin' it. It's good still for years and years and....



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