Compression questions???
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Intermediate
Joined: Jan 2017
Posts: 31
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From: Hawaii
Compression questions???
I recently did the 106 build with Andrews 57 cam and rush wrath, ss quickie pushrods, ss Lifters I just got around to doing a compression test and got 180 in both front and rear. On the bigboyzheads I put my setup in and should be getting close to 200. I'm thinking it's a pushrod adjustment, stretched timing chain not sure. But since the compression is even I don't think I'm off a tooth curious to hear your thoughts. Any suggestions would be appreciated.
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Joined: Oct 2013
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From: Penticton BC Canada
I recently did the 106 build with Andrews 57 cam and rush wrath, ss quickie pushrods, ss Lifters I just got around to doing a compression test and got 180 in both front and rear. On the bigboyzheads I put my setup in and should be getting close to 200. I'm thinking it's a pushrod adjustment, stretched timing chain not sure. But since the compression is even I don't think I'm off a tooth curious to hear your thoughts. Any suggestions would be appreciated.
There's nothing wrong with 180 psi- don't get too caught up in the internet tuners saying you gotta have 200 psi.
Maybe its just the gauge? I have 2 compression gauges. Both have about a foot of hose, one has a schrader valve right at the plug threads, the other has the schrader at the gauge and nothing at the plug threads.
Because of the volume of air in the hose, the one without the schrader at the plug threads always reads about 20 lbs less.
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Joined: Nov 2013
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From: Santa Clarita
I recently did the 106 build with Andrews 57 cam and rush wrath, ss quickie pushrods, ss Lifters I just got around to doing a compression test and got 180 in both front and rear. On the bigboyzheads I put my setup in and should be getting close to 200. I'm thinking it's a pushrod adjustment, stretched timing chain not sure. But since the compression is even I don't think I'm off a tooth curious to hear your thoughts. Any suggestions would be appreciated.
So, relax, all is well, methinks...ride that puppy!
Thread Starter
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Intermediate
Joined: Jan 2017
Posts: 31
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From: Hawaii
Thanks for the responses.
There's around 600-700 miles on this build. Both cylinders are right at 180 within 5 of each other. After putting the information in the calculator a 15 to 20 difference sounds like something Is wrong. I'm currently stationed in Hawaii so the sea level factor went out of the equation....
There's around 600-700 miles on this build. Both cylinders are right at 180 within 5 of each other. After putting the information in the calculator a 15 to 20 difference sounds like something Is wrong. I'm currently stationed in Hawaii so the sea level factor went out of the equation....
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Thread Starter
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Intermediate
Joined: Jan 2017
Posts: 31
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From: Hawaii
It's not a pushrod issue, I doubt the timing chain as well.
There's nothing wrong with 180 psi- don't get too caught up in the internet tuners saying you gotta have 200 psi.
Maybe its just the gauge? I have 2 compression gauges. Both have about a foot of hose, one has a schrader valve right at the plug threads, the other has the schrader at the gauge and nothing at the plug threads.
Because of the volume of air in the hose, the one without the schrader at the plug threads always reads about 20 lbs less.
There's nothing wrong with 180 psi- don't get too caught up in the internet tuners saying you gotta have 200 psi.
Maybe its just the gauge? I have 2 compression gauges. Both have about a foot of hose, one has a schrader valve right at the plug threads, the other has the schrader at the gauge and nothing at the plug threads.
Because of the volume of air in the hose, the one without the schrader at the plug threads always reads about 20 lbs less.
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Did you have the barrels off ? And if so, did you put new rings on the pistons ? Sometimes a detail in the story is missed, just trying to help you my friend.
