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-   -   May Day !! Down a cylinder (https://classracer.com/classforum/showthread.php?t=52856)

philbilly 04-29-2014 11:32 AM
Re: May Day !! Down a cylinder
 
I believe it oil. It doesn't smell much like gas. I am headed to pressure check some things. Let u know Results shortly.

STK1217 04-29-2014 11:48 AM
Re: May Day !! Down a cylinder
 
Quote:
Originally Posted by philbilly (Post 429575)
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
Re: May Day !! Down a cylinder
 
Quote:
Originally Posted by STK1217 (Post 429614)
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.

gbur 04-29-2014 01:27 PM
Re: May Day !! Down a cylinder
 
Quote:
Originally Posted by Dan Lattimore (Post 429603)
Collapsed sealed power/speed pro style oil ring expander will do that and still show good leak . Just a thought ------
agree with the oil ring problem

Mike Taylor 3601 04-29-2014 01:42 PM
Re: May Day !! Down a cylinder
 
Quote:
Originally Posted by philbilly (Post 429616)
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
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

Adger Smith 04-30-2014 12:06 AM
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!!

JimL 04-30-2014 12:15 AM
Re: May Day !! Down a cylinder
 
What distributor do you have in it?

SS Engine Guy 04-30-2014 03:03 AM
Re: May Day !! Down a cylinder
 
Check valve springs on that cylinder.

philbilly 04-30-2014 07:32 AM
Re: May Day !! Down a cylinder
 
I have total seal rings. i have msd ignition I have changed every piece of it. I have done everything most has named twice. the piston is clean as a pin guys. there is no oil ,if a ring was bad enough to foul my plugs wouldnt you think there would be oil on top of piston.


i really appreciate all the advise but I am throwing in the towel for a couple days. I have some concrete to get poured now the rain is over.

hopefully be back in action by norwalk!


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