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Author Topic: Compression Releases  (Read 4779 times)

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johnsachs

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Compression Releases
« on: September 19, 2018, 06:36:49 PM »

I'm seeing more plugged up compression release passages (release to exhaust port exit) on an above average # of heads coming in here with MoCo releases.  >:( It seems to favor the rear head. Several were so bad, I had to make/use a .110" diameter rod with a point to get through, and remove the blockage, which took Brakekleen, and a hammer. No way the release could have bled off pressure.
* Always check the passages.*
John
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MCE

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Re: Compression Releases
« Reply #1 on: September 19, 2018, 10:37:14 PM »

Get a bigger hammer John!
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HD Street Performance

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Re: Compression Releases
« Reply #2 on: September 20, 2018, 08:58:57 AM »

Same here.
I drill them between the pushrod tubes when retrofitting.
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MCE

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Re: Compression Releases
« Reply #3 on: September 20, 2018, 12:27:51 PM »

Same here.
I drill them between the pushrod tubes when retrofitting.

You're venting them out the side then? That's an interesting way to do it, (hadn't thought of that).
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Phreakyz

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Re: Compression Releases
« Reply #4 on: September 20, 2018, 03:20:42 PM »

You're venting them out the side then? That's an interesting way to do it, (hadn't thought of that).

You guys might as well be speaking Chinese to me!   How about some pics?
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MCE

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Re: Compression Releases
« Reply #5 on: September 20, 2018, 04:32:33 PM »

You guys might as well be speaking Chinese to me!   How about some pics?

The factory ones vent out through a hole in the Ex port. I think Don is suggesting to drill the hole
out the side of the head. (that's my take, but I'm just a Texas redneck) 
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TorqueInc

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Re: Compression Releases
« Reply #6 on: September 20, 2018, 05:10:18 PM »

The commercial spray stuff they use to remove carbon from pizza/baking pans turns the stuff in the carboned up hole into black goo that can be removed with a air hose
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longlast

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Re: Compression Releases
« Reply #7 on: September 20, 2018, 05:45:35 PM »

You guys might as well be speaking Chinese to me!   How about some pics?

There are manual and there are auto types, they are screwed  into the heads. The auto ones open when you turn the ignition switch on so when you hit the starter they reduce the amount of cylinder compression too make it easier on the starter to crank the motor once it starts they close and there is full compression again.

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johnsachs

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Re: Compression Releases
« Reply #8 on: September 20, 2018, 06:40:07 PM »

Get a bigger hammer John!
The way I use a hammer, I would wind up with a bigger exhaust port.  ::)
John
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johnsachs

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Re: Compression Releases
« Reply #9 on: September 20, 2018, 06:46:02 PM »

Same here.
I drill them between the pushrod tubes when retrofitting.
I did that once after getting an OK from the customer. After all said and done, he was pissed because it blew s**t on his leg, got engine parts dirty, and made too much noise.  :nixweiss:
John
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OBB

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Re: Compression Releases
« Reply #10 on: September 20, 2018, 07:13:43 PM »

The commercial spray stuff they use to remove carbon from pizza/baking pans turns the stuff in the carboned up hole into black goo that can be removed with a air hose
Won't ever be eating pizza at your place  :'(

 :huepfenjump3:
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prodrag1320

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Re: Compression Releases
« Reply #11 on: September 21, 2018, 07:35:35 AM »

have to keep my eyes open for this,i just plug them right off the bat when on the SERDI for seat work or on the flow bench,cant say I ever really checked to see if their clogged

MCE

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Re: Compression Releases
« Reply #12 on: September 21, 2018, 01:32:53 PM »

have to keep my eyes open for this,i just plug them right off the bat when on the SERDI for seat work or on the flow bench,cant say I ever really checked to see if their clogged


I run a short piece of TIG wire through the hole, haven't run across a blockage yet, but I'm definitely going to be
keeping a closer eye on it. (Thanks for bringing it up John)
« Last Edit: September 21, 2018, 04:07:51 PM by MCE Performance »
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FlaHeatWave

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Re: Compression Releases
« Reply #13 on: September 22, 2018, 12:00:32 PM »

Are you guys noticing any pattern(s)?? Mileage? Years? Models? Fuel? etc,,,
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HD Street Performance

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Re: Compression Releases
« Reply #14 on: September 22, 2018, 05:29:21 PM »

No, but if the exhaust port shows signs of oil from down the guide or from combustion the port can get plugged. The other issue with the acts is they are not tight
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