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Old 06-16-2013, 09:18 PM
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383 Antifreeze out of the exhaust, help

Its a new-ish motor less then 1k on it. Mild cam, running a TBI top end. Give me ideas where to look and what to check.

The car idles and revs properly.
Oil is clean
Data-logs perfectly.

This is a friends car who's deployed overseas and asked me to get it going again for him.

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Old 06-16-2013, 09:55 PM
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Do a leak down test and be ready to pull the heads. The leak down test will give a cylinder(s) to look carefully at. Either head or had gasket is bad - hopefully head gasket.

If you are the one that pulls it apart, pay close attention to the head bolts, fasket mating surfaces and head gasket when they're removed.

Some more info would be helpful - what is the engine and what has been done to it, did the coolant come out of the exhaust immediately when started or after it warmed up?
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Old 06-16-2013, 10:34 PM
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I'm going to say hopefully the head gasket(s) are bad, I'd hate telling him he needs a new head but would be a great chance for him to get it to breath right.

I'll be the one tearing it down and fixing it for him.

As far as I know it is as follows:
4.030 X 3.750
10.X:1 compression
224/230-ish cam at .050
Stock heads (no clue what casting, i know they're iron heads still)
T.P.I Ported lower, SLP Runners, Ported Plenum w/ 58X2 TB and 42lb/hr injectors

It was running fine til he swapped from 24lb/hr to 42lb/hr injectors (he did get a mail order tune) so i'm kinda wondering if it was the tune possibly running lean or if he doesn't have true 42lb/hr injectors causing a lean condition to burn something up.
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Old 06-17-2013, 04:01 AM
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A intake gasket leak can be internal or external.So if it is leaking to the intake side and then pushing out the exhaust is one possibility.
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Old 06-17-2013, 04:07 AM
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Anti freeze or water?........Does it stop after a few minutes?....could just be condensation

Pull the plugs and see if one is cleaner than the others....That's where there's a leak
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Old 06-17-2013, 04:25 AM
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Leave the rad cap loose and after the stat has opened look into the rad filler for a stream of bubbles.The engine is back pressurizing the coolant system and that is either a cracked head or a blown head gasket.

Best bet is a leakdown test.

But at the end of the day with all the best tests in the world it still might need to be torn down for a close inspection and possible mag the heads.
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Old 06-17-2013, 03:26 PM
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Quote:
Originally Posted by Eric63M View Post
I'm going to say hopefully the head gasket(s) are bad, I'd hate telling him he needs a new head but would be a great chance for him to get it to breath right.

I'll be the one tearing it down and fixing it for him.

As far as I know it is as follows:
4.030 X 3.750
10.X:1 compression
224/230-ish cam at .050
Stock heads (no clue what casting, i know they're iron heads still)
T.P.I Ported lower, SLP Runners, Ported Plenum w/ 58X2 TB and 42lb/hr injectors

It was running fine til he swapped from 24lb/hr to 42lb/hr injectors (he did get a mail order tune) so i'm kinda wondering if it was the tune possibly running lean or if he doesn't have true 42lb/hr injectors causing a lean condition to burn something up.
You mentioned in your first post that it was a TBI, not TPI. I'm very curious how this runs on the dyno. It must make a TON of low end, but where is it running out of air? This setup seems mismatched, but I want to try it in the worst way just say it can be done effectively. Maybe the SLP's make all the difference - dunno.

From my figuring, the 42 lb injectors are overkill if he is running stock heads, unless they flow really well - lots $$$$.

What is it using for an ECM - stock or aftermarket?
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Old 06-17-2013, 05:06 PM
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It runs like ****. Falls on its face at 3200. Still had the stock ecm. Talked him into a whole brodix track 1 to end kit, 750 double pumper and the new comp cam built with the different durations at different cylinders. When the parts get here it'll finally run like it should have from the begining.
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