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97 Challenger 1800...Compression

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tinman37

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I have a 1997 Challenger 1800. I brought this down to Tampa over my winter months in Cleveland Ohio and to make a long story short i replaced both engines, carbs rebuilt and new bearings on the pumps. My mechanic took it out and said it ran perfect. When i took it out the driver side engine kept shutting down at 4500 rpms. I checked the compression on both engines and they were as follows RH engine mag-0 and PTO-110 the LH engine mag-130 and PTO-118. The spark plugs on the RH engine were extremely dry and looks like the engine was running without oil. Possible oil pump failure??? Since i am in clevelnd and my warranty on my engines is in the Tampa area from "Jet Ski Masters" I am confused at what is wrong and why something like this could happen. To me it seems the compression is low and Jet ski Masters is telling since the New/Rebuild engines were bored out this would have an effect on the engine compression and as long as the conmpression is over 100 i am fine??? Any Advise would help. My wife and kids are driving back down to tampa in the next couple of week if i need to have her take anything down there she can and get my warranty parts.
 
With No replies I figured it out

Well my engines was cutting off @ 4500 rpms. Lack of oil was my what i ended up coming to. The pistons were brand new and looked old. Checked the rave valve was working properly, it was. Made sure the oil pump was working, it was. The engine was rebuilt from the top down and just figured it was a bad motor. So i started to pull the engine out and found that when the mechanic installed the engine the front motor mounting bracket bolt pinched the oil line and had it closed by 3/4 of the way. Lack of oil. The engine needs redone. I always like to look at the good side of things. The mechanic 'Jet ski masters' in tampa is replacing the motor. Once i install the engine i will undertand this boat really well. It was sort of fun pulling it. I know that the mechanic did a good job and had an honest mistake.
By the way i did a compression check on both engines before i started the tear down and my readings were alot different than the jet ski place i took it to in cleveland. They read 0 & 110, 130 &118 and i read 65 & 120, 160 & 145. Pretty big difference. Hope this helps anyone else
 
Here is a good link for breaking in motors, this may also contribute to bad compression, interesting reading.Even 150 psi across all cylinders is what your after!!
When you do a compression test, you should put a squirt of fuel/oil mix into the cylinder to create the atmosphere that it works in.
I hope it all works out for you!!
http://www.mototuneusa.com/break_in_secrets.htm
 
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