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compression after rebuild super C


 
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Scott Blanchard
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Joined: 22 Mar 2011
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PostPosted: Tue Mar 26, 2013 5:21 am    Post subject: compression after rebuild super C Reply to specific post Reply with quote

I just got my super C back together. I did a complete motor job, punched it out to 3.25. I ran the motor to heat it up then retorqued the head down. I did a compression test and got about 115 in cylinder 4,2 and 1 in 3 I only got 60#. My gasket isn"t leaking on the outside and I had my head tested. What could be the reason for the lack of compression. Hopefully they need to seat or something. Please help
 
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CLIFF S
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Joined: 12 Jun 2005
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Location: Cogan Station,PA

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PostPosted: Tue Mar 26, 2013 5:55 am    Post subject: Re: compression after rebuild super C Reply to specific post Reply with quote

did you go back through and reset your valves after you restore your head?

Cliff S
 
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CLIFF S
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Location: Cogan Station,PA

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PostPosted: Tue Mar 26, 2013 5:58 am    Post subject: Re: compression after rebuild super C Reply to specific post Reply with quote

After you Retorqued your Head !
 
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Earl-IL
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PostPosted: Tue Mar 26, 2013 6:47 am    Post subject: Re: compression after rebuild super C Reply to specific post Reply with quote

Do a cyl leak down test, it will tell you if it is the valves or rings.Listen to the exhaust, carb, or crankcase breather you will hear the air leaking by. Bring that cyl to top dead center both valves closed. Apply controlled air (30--100 PSI ) using a air line pressure regulator. You can make a air adapter out of a old spark plug, weld in a hose adapter.Any question email is open. Earl
 
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Scott Blanchard
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PostPosted: Tue Mar 26, 2013 7:02 am    Post subject: Re: compression after rebuild super C Reply to specific post Reply with quote

I checked them kind of quickly, That could be it, I would loose pressure if a valve didn't seat all the way (too tight) wouldn't I? If I tightened the head it would put more pressure on the rocker, that makes sense. Thanks. I think I am going to try the air pressure test too.
 
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