compression numbers
#1
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Sorry about the empty topic post...
What do you think of these compression numbers?
Front- (241 RPM) 9.7/9.6/9.6
Rear- (238RPM) 9.4/9.4/9.0
Engine flooded, so I turned it over and let sit for 3 days with no plugs, then injected ATF, turned it over by hand and checked compression cold.
Do these sound a little high for a used 13B?
Thoughts, opinions, etc.....?
-Gordon
What do you think of these compression numbers?
Front- (241 RPM) 9.7/9.6/9.6
Rear- (238RPM) 9.4/9.4/9.0
Engine flooded, so I turned it over and let sit for 3 days with no plugs, then injected ATF, turned it over by hand and checked compression cold.
Do these sound a little high for a used 13B?
Thoughts, opinions, etc.....?
-Gordon
#4
Keep Right Except to Pass
Do these sound a little high for a used 13B?
It must be an S5 NA. I get a maximum comp @ sealevel of 10.025 kg/cm2, just working off c/r.
What are the #s when you correct for rpm? I'm assuming you're using a Mazda comp tester. Isn't there a chart somewhere for that? It wouldn't really be much I guess, since you were close.
Better than low compression whatever the deal.
#5
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Thanks for the replies and I will change my oil. I have always checked my compression before when my motor was running but of course not running when I did the compression test. I have never checked this engine 13b 4 port old school and I know the ATF would raise the numbers. I took the demon carb i have and sent it to TPC in calif to check my present settings so Ty can build me a 650double pumper boost referenced so I can realize the power of my supercharger. I am changing the complete fuel delivery to aeromotive with a raising regulator and wiring kit so my volts stay high(also put on a 93alternator to make sure). Now flood on me no more.
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