May Day !! Down a cylinder

philbilly · 04-29-2014, 09:00 AM

Chuck we changed plugs and wires several times. I am thinking guide but if guide was wore it would show in leak down?
This is the new head we did fix. I busted one at gators.
Mb is gonna post up pic of plugs for me. I sent him pic of 1 and 7 plug so y'all could see

philbilly · 04-29-2014, 09:03 AM

Running with a temp gun number 7 never gets within 200 degrees of other cylinders.

Michael Beard · 04-29-2014, 09:05 AM

Posting for Phil:

philbilly · 04-29-2014, 09:08 AM

Thanks Michael. That is 1 and 7 plug I changed number 7 that is one run on that plug.

STK1217 · 04-29-2014, 11:48 AM

Quote:

Originally Posted by philbilly

Chuck we changed plugs and wires several times. I am thinking guide but if guide was wore it would show in leak down?
This is the new head we did fix. I busted one at gators.
Mb is gonna post up pic of plugs for me. I sent him pic of 1 and 7 plug so y'all could see

Just a question, How would a loose guide or bad valve seal show up in a leak down test?

philbilly · 04-29-2014, 12:12 PM

Quote:

Originally Posted by STK1217

Just a question, How would a loose guide or bad valve seal show up in a leak down test?

I wouldn't think it would beings it's above the seat. Wouldn't the spring hold the valve in the seat good.
If I knew the answer I wouldn't be on here. I am going to tear into the head I don't find nothing obvious I will have the pistons on the bench before I sleep I promise.

Mike Taylor 3601 · 04-29-2014, 01:42 PM

Quote:

Originally Posted by philbilly

I wouldn't think it would beings it's above the seat. Wouldn't the spring hold the valve in the seat good.
If I knew the answer I wouldn't be on here. I am going to tear into the head I don't find nothing obvious I will have the pistons on the bench before I sleep I promise.

I think that is right next step,call me you need anything
Mike Taylor 3601

Dyno · 04-29-2014, 08:41 PM

I had a broken expander on the oil ring and it pumped oil like crazy. Pull the piston and you will find the problem. Dyno

Adger Smith · 04-30-2014, 12:06 AM

Did you say Speed Pro/ Sealed Power rings?
If they are:
Second ring installed upside down. Reverse twist is pushing oil up the cylinder.
Second choice would be the oil ring expander overlapped.
Have you rotated the firing order on the cap to be sure that there is one firing
cycle that is dead? I had a HEI kick my butt like that!!

04-29-2014, 09:00 AM	#1
philbilly Member Join Date: Aug 2011 Location: Demossville,KY Posts: 337 Likes: 0 Liked 0 Times in 0 Posts	Re: May Day !! Down a cylinder Chuck we changed plugs and wires several times. I am thinking guide but if guide was wore it would show in leak down? This is the new head we did fix. I busted one at gators. Mb is gonna post up pic of plugs for me. I sent him pic of 1 and 7 plug so y'all could see

04-29-2014, 09:03 AM	#2
philbilly Member Join Date: Aug 2011 Location: Demossville,KY Posts: 337 Likes: 0 Liked 0 Times in 0 Posts	Re: May Day !! Down a cylinder Running with a temp gun number 7 never gets within 200 degrees of other cylinders.

04-29-2014, 09:05 AM	#3
Michael Beard VIP Member Join Date: Sep 2002 Location: Columbus, OH Posts: 4,060 Likes: 0 Liked 13 Times in 9 Posts	Re: May Day !! Down a cylinder Posting for Phil: __________________ Michael Beard - NHRA/IHRA 3216 S/SS

04-29-2014, 09:08 AM	#4
philbilly Member Join Date: Aug 2011 Location: Demossville,KY Posts: 337 Likes: 0 Liked 0 Times in 0 Posts	Re: May Day !! Down a cylinder Thanks Michael. That is 1 and 7 plug I changed number 7 that is one run on that plug.

04-29-2014, 08:41 PM	#8
Dyno Senior Member Join Date: Dec 2002 Posts: 920 Likes: 1,148 Liked 695 Times in 206 Posts	Re: May Day !! Down a cylinder I had a broken expander on the oil ring and it pumped oil like crazy. Pull the piston and you will find the problem. Dyno

04-30-2014, 12:06 AM	#9
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: May Day !! Down a cylinder Did you say Speed Pro/ Sealed Power rings? If they are: Second ring installed upside down. Reverse twist is pushing oil up the cylinder. Second choice would be the oil ring expander overlapped. Have you rotated the firing order on the cap to be sure that there is one firing cycle that is dead? I had a HEI kick my butt like that!! __________________ Adger Smith (Former SS)