Cylinder #5 sucked water due to crap header. What next?

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12-25-2015, 10:48 AM

#51

1BIGJIM

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Quote:

Originally Posted by MILD THUNDER

[ATTACH=CONFIG]545190[/ATTACH]

I need one of those for Christmas.

12-25-2015, 11:30 AM

#52

KAOSS

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I'd check everything that moves first shortblock , heads , valve job. Not to be sarcastic but pressure test headers. Basically your lucky you didn't shoot a valve across the intake. Bust out another thousand

12-25-2015, 11:38 AM

#53

KAOSS

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Stainless marine makes an awesome system lasts longer than tube headers. End your problems.

12-25-2015, 11:46 AM

#54

Baja Rooster

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Quote:

Originally Posted by KAOSS

I did a compression test on that cylinder after some run time and got 185#, which is in line with the others. Then I pulled the heads, checked the shortblock, piston travel with dial guage, and had a full valve job done on the heads. I pressure checked the headers but looking into SM or EMI manifolds as well. This has not been fun and all for the sake of a stupid header. I feel like I dodged a bullet on this one.

Quote:

Originally Posted by 1BIGJIM

I need one of those for Christmas.

They're pretty inexpensive from Summit. Get the one with the magnets in the base though as that helps a lot.

04-30-2016, 09:37 PM

#55

Baja Rooster

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Originally Posted by Baja Rooster

So now that everything dried out a bit I went back and loaded the cylinders with WD40 and cranked it a few times. The surge before was with the comp tester in. Without it it spins quite freely. Redid the whole test with 4 compression strokes each test and here are the results. I did not have an air compressor to blow out #5 so it's still off the charts.

#1 175
#3 180
#5 210
#7 180
#2 185
#4 180
#6 180
#8 180

Wow. So after having the heads redone over the winter these are the new numbers. The engine was cold but had been run for about ten minutes on the hose to clear out the cobwebs a few days prior.

#1 215
#3 215
#5 220
#7 215
#2 215
#4 220
#6 215
#8 215

Last edited by Baja Rooster; 04-30-2016 at 09:57 PM.

04-30-2016, 09:46 PM

#56

MILD THUNDER

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Quote:

Originally Posted by Baja Rooster

What kind of shape were the heads in when they tore into them? Did they do any milling, new seats or anything ?

04-30-2016, 09:57 PM

#57

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Quote:

Originally Posted by Baja Rooster

May be too much even for 93 octane.

What do you have for actual compression and what cam are you running ?

Last edited by SB; 04-30-2016 at 09:59 PM.

04-30-2016, 10:04 PM

#58

Baja Rooster

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It is a cheap Kragen guage. The needle doesn't even rest on the pin, but it is the same guage for all of the test. Just looking for consistency. The #2 cylinder was the first one I tested. I retested at the end and it came up to 215. *Edited original post

The heads only had less than 100 hours, new Ferrea valves cut into the existing seats. The original valves/seats had a crazy eclipse to them. The heads surfaces were just minimally cleaned up and It should only be 9.6:1

Edit: GMZZ502 cam. CMI headers and the water dumps at the tips.

Last edited by Baja Rooster; 04-30-2016 at 10:23 PM.

05-01-2016, 08:48 PM

#59

Tinkerer

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I don't have the bridge for my dial indicator. I have the magnetic base. When I use mine I mount it to read the center of the piston not the edge. Wouldn't using the edge give you some error due to piston rock?