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429 issues...

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79tunnell429

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« on: July 07, 2011, 02:23:06 PM »
I'm new to this so please excuse my f ups!  :banghead: I just had my 429 CJ rebuilt from the ground up, I broke the crank last august, new pistons, rods, crank, (forged this time) bored etc.. Full roller motor, the guy said to break it in drive it, I said ok. Here are my issues 1st time I go out the starter fried, went and got one from the auto store put it on cranked the motor in reverse. Blew some flame out my carb. Pulled the carb checked the power valves etc everything was good or so I thought.. I go out again, it's sputtering.. I change the plugs change the oil runs perfect..5600 rpms, 84 gps, love it. I park it.2 days later I head to lake Oroville for fourth of July put my boat in the water, warm it can't get more than 5300-5400 rpms out of it.. I figure conditions elevation or whatever.. Then I'm haulin ass back in to camp about 5300  let off the gas it and all of a sudden it's running radical missing and blowing some black smoke shut it down and 2 foot flames come out of my basset headers for about 15 sec.. I get towed in tried starting it and I had to have my foot in it to keep it running still the same feeling like it's flooded to shit.. Next morning.. I start it. Runs like nothing ever happened. Still at 5300-5400. Now I've talked to a guy he seems to think I may have cracked a piston?? Oh and in the mean time my headers cracked on the number one cylinder, anybody with any similar stories or some input would be great! I have a built berkley with a bronze impeller I believe it's an A. My hull is a 79 sleek craft tunnel sst. Any help or input would be awesome!


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N2GLOCK

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« Reply #1 on: July 07, 2011, 03:25:51 PM »
I can't help you w/ your problem, but this forum is full of helpful people that can probably give you some good ideas as to what's goin on. Sounds to me like whoever told you about the cracked piston just threw out a Hail Mary right there. If you had a cracked piston, that thing would run like crap all the time. The cracked header at #1 is of concern. I wonder if that cylinder got way too hot from detonation or something.

IRRebel

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« Reply #2 on: July 07, 2011, 06:08:12 PM »
Pull the valve covers and look for bent pushrods/broken rockers. Compression and leakdown test would certainly be in order before you run it again. Should give you a better idea about what happened and whats going on in there.

Black smoke......flame out the exhaust....cracked header.......bent exhaust valves possibly?

If all that checks out, I'd be thinking ignition timing/Dizzy problems.

Ray
"Life's journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways totally worn out shouting 'Holy Shit what a ride!"---Crewcheif22 AKA Keith

79tunnell429

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« Reply #3 on: July 09, 2011, 10:04:48 AM »
Checked the valves. Checked the compression, everything is good, I had a lot of carbon build up on the pistons, 3 of my 8 new spark plugs are turning black, welded the headers back up, took it to the lake, it's running good, sounds good, still missing the 300 Rpms. Is it possible that my msd ignition is taking a shit? Do they get weak over time? Also a couple of my plug wires arent snapping on to the plugs. Would that create a weaker spark?? Oh and how the hell do you post pics??

GT Jets

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« Reply #4 on: July 09, 2011, 10:51:42 AM »
5800 RPMs on a bronze A?       

I'll get back to that later......

I am immediately thinking two things. With three carbon laden plugs, carburetor issues surely could be the cause. I am also thinking that you have some bad ignition wires, you mention three fouled plugs and "a few" plug wires fitting loosely, any chance the loose terminals were on the fouled plugs?

The next thing I am thinking, do you have a rev limiter? You may look into that, seen those do some Twilight Zone type things before. They really hate moisture from my experience.

I would also have the tach checked out, along with the wiring harness for possible issues.

It could be valve related for sure, but a compression test and a vacuum test would find that pretty quickly and should be easy to rule out..

Sounds like a bad ass boat and looking forward to the pictures.. :thumbup:

Welcome aboard and good luck.

GT
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
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If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

79tunnell429

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« Reply #5 on: July 09, 2011, 11:04:59 AM »
I've got the whole msd 6al box, coil, Distributer, wires, it's got the round dials to adjust the  1st step rev limiter, and second step 1* advance and retard, One more thing.. Do they make a pressure sensitive valve for the water injected headers? I'm sick of reaching back and opening it up and closing it, I've gotten water in my oil from leaving it open at idle I guess??


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GT Jets

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« Reply #6 on: July 09, 2011, 11:15:28 AM »
I've got the whole msd 6al box, coil, Distributer, wires, it's got the round dials to adjust the  1st step rev limiter, and second step 1* advance and retard, One more thing.. Do they make a pressure sensitive valve for the water injected headers? I'm sick of reaching back and opening it up and closing it, I've gotten water in my oil from leaving it open at idle I guess??

The bomb diggity for waterr control of injected headers is a Banderlog http://www.banderlog.com/products/waterInjectionValve/waterInjection.html system...., bad ass but pricey....

You could also get just a standard Bassett water control valve...People here probably have what you need used for a reasonable price.

GT
« Last Edit: July 09, 2011, 12:37:35 PM by GT Jets »
  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Time to man up and yank it John!  :banghead:
Ray

79tunnell429

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« Reply #7 on: July 09, 2011, 11:17:34 AM »
Heres a video from havasu last year, my buddy's boat is the orange one, one of gale banks first mess arounds with turbos.. It's got his signatures all over it. Mines the white one.




79tunnell429

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« Reply #8 on: July 09, 2011, 11:34:46 AM »

Nordie

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« Reply #9 on: July 09, 2011, 08:22:59 PM »
that boat is straight bad ass... :thumbup:


If im not posting..I'm pooping!

Nixonnow

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« Reply #10 on: July 09, 2011, 08:40:03 PM »
That boat is sweet. How fast were you guys going in the video?
  • Boat #1: 1974 Hallett Bubbledeck
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79tunnell429

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« Reply #11 on: July 10, 2011, 02:15:28 AM »
81 mph was my max gps. My buddy's boat is 2-3 mph faster but can't hold it for more than few seconds because the turbos get hot


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