ratsun

Hey guys I did the Manometer blow by test as per one of the posts here and wondered about my results. This is the post I read:
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~Rough conversion is:1"= 27 lpm, add 3 lpm for each one inch (1/2'' of rise in the tube) of water

New engines numbers are;
63 liters per minute(2.5" water rise = 5" of water) @ 2200rpm,
76 L/Min (3.5" rise) @ 2500rpm
85 L/Min (4.5" rise) @ 2800rpm.

Worn engine that needs rebuilding are roughly double i.e.
126 L/Min(10.5"rise) @ 2200rpm
152 L/Min(14.5"rise) @ 2500rpm
170 L/Min(17"rise) @ 2800 rpm
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My test the #s were
2200rpm = 3.5" rise
2500rpm = 4.75" rise
2800rpm = 5.375" rise
Those # seem fair but the conversion to LPM doesnt add up?
What numbers would you expect to see from a 12v with 110k on it?
I am having a mental laps and cant seem to figure it out

Smkndzl

Just be sure you use a .221 orifice when you did your test.

ratsun

I used the 15/64 recomended
Does that convert to .221"?

oestreich84

close, 15/64" is about .234" I don't know if that is enough of a difference to cause the readings to be off or not.

infidel

Your readings indicate a slightly worn engine, how many miles on it?
The 13 thousandths of an inch difference between 15/64" and .221 will make very little difference. In fact your tach not being totally accurate will make a much bigger difference. In one of Dodge's TSBs they don't consider the stock tach accurate enough to even adjust the idle.