Author Topic: No performance (Read 17840 times)

adams18 · « **Reply #15 on:** January 31, 2011, 06:23:13 pm »

What are all the ways oil could get into the combustion chambers?

beastie_3 · « **Reply #16 on:** January 31, 2011, 07:01:01 pm »

bad valve seals is one. Cracked heads or cracked block,

beastie_3 · « **Reply #17 on:** January 31, 2011, 07:01:39 pm »

How much oil do you have in the cylinders?

adams18 · « **Reply #18 on:** January 31, 2011, 11:44:07 pm »

It was just a thin coat on the cylinder walls and piston, but definitely visible. I used Teflon valve seals when i built the engine. Cracked heads seem like a reasonable explanation though. The heads I used had had a rough life, not to mention that they have thin casting and are prone to cracking, but i used them anyhow because they had a 3 angle valve job. I also had the heads and block magnaflux crack tested before I built the engine and the machinist told me there were no cracks.

adams18 · « **Reply #19 on:** February 01, 2011, 01:24:44 am »

Could drilling and tapping for threaded rocker arm studs have cracked the heads?

screamin86 · « **Reply #20 on:** February 01, 2011, 01:55:52 am »

Did the machine shop do the drilling and taping?

adams18 · « **Reply #21 on:** February 01, 2011, 02:15:36 am »

No. I did the drilling and tapping.

adams18 · « **Reply #22 on:** February 01, 2011, 03:42:53 pm »

The top compresssion ring has a chamber. Does that go up or down?

1979C20 · « **Reply #23 on:** February 01, 2011, 03:46:34 pm »

The top, and middle ring's cambers should be facing towards the top of the piston.

adams18 · « **Reply #24 on:** February 01, 2011, 04:04:42 pm »

Do you think the threads of the rocker arm studs could be leaking oil into the compression chambers?

1979C20 · « **Reply #25 on:** February 01, 2011, 04:27:28 pm »

Personally, I dont know. I dont really know the mechanics of the heads. Just know how to build the engine. I would take the heads to a machine shop and have them inspected, maybe they can find any oil leaking problems. Did you check all of your rings? Can you get a picture of a piston with the rings on? And pictures of the cylinders?

adams18 · « **Reply #26 on:** February 01, 2011, 04:29:47 pm »

yeah, i can get pictures of those. I looked at my rings again, and both of the rings had the chamfer towards the bottom of the piston. Even with the dot on the second compression ring facing up. both chamfers were down

beastie_3 · « **Reply #27 on:** February 01, 2011, 06:28:08 pm »

I dont know if it was asked or stated, but is it one cylinder, or many?

adams18 · « **Reply #28 on:** February 01, 2011, 07:36:30 pm »

all cylinders had oil and all pistons were black with carbon

1979C20 · « **Reply #29 on:** February 01, 2011, 07:59:04 pm »

The angled edges of all of the plugs should be facing the top of the cylinder, despite the markings. Thats where your problem lies.

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Author Topic: No performance (Read 17840 times)

adams18

Re: No performance

beastie_3

Re: No performance

beastie_3

Re: No performance

adams18

Re: No performance

adams18

Re: No performance

screamin86

Re: No performance

adams18

Re: No performance

adams18

Re: No performance

1979C20

Re: No performance

adams18

Re: No performance

1979C20

Re: No performance

adams18

Re: No performance

beastie_3

Re: No performance

adams18

Re: No performance

1979C20

Re: No performance