Tomas Wallin
Charter Member
Yup, a hyd roller and the cam is running perfectly since I put it together again.
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What caused my melted piston?
- Thread starter Tomas Wallin
- Start date
Yup, a hyd roller and the cam is running perfectly since I put it together again.
Coolerman
Charter Member
maybe it's the light, but in that 2nd pic, it looks like the block got torched. Also, I thought these motors were at 6lbs boost :26::26::26:
indywhsle
New member
I have not posted here much if at all but I just read every page and since I just had the same problem with my 502 with a m3 procharger putting out 730hp and 785fpt I figured that I would chime in. Mine had dyno time plus 4 or 5 hrs. and long story short it was the water pick up. I would recomend putting a low water pick up on the boat. Don't know if you already have one but that was never asked in any of the posts.
WeaponX
Charter Member
Block is perfect. Burnt through the MLS gasket between 5&7 a little.
Lots of talk on these motors but the facts are 1063 hp at 6.8 psi on pump and 1186 hp at 12psi could get more out of it at both psi but I had just one day on the dyno only ran six pulls.
And it was the five days before the Shootout. :sifone:
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Tomas Wallin
Charter Member
Actually I did put on a new dual design pickup (engine and IC) after this incident so the flow is better now but it should have been sufficient enough before as well. I know the flow through the intercooler is alot better with the new pickupdesign.
I use the drive water pickup for the drive oil cooler.
DAREDEVIL
Banned
PICS of the pickup ??
2112
Founding Member / Contributor
How did you catch this? Just on tear down after a Dyno pull or was it in the boat already?
.
WeaponX
Charter Member
After it ran. Just a bad guess on fuel blends. I saw a drop in power and boost and pulled out of it on a run for top speed. Got lucky on this one I've seen alot worse.
Geronimo36
Charter Member
Yeah man, you got real lucky, that's cool!! :driving:
I kinda got lucky like that once... Had an engine pop the head gasket out in the 11 oclock position on #7. Blew the chunk of gasket into the lifter valley...
Luckilly the gasket was the weak link otherwise the piston would have been moments later! :26:
indywhsle
New member
I thought the same thing. $6000 later I'm not so sure.
Tomas Wallin
Charter Member
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Geronimo36
Charter Member
Are you bleeding water off the rear corners of the cylinder heads?
If so, how big are the hoses?
Tomas Wallin
Charter Member
No I'm not.
How should that be plumbed?
I assume the bleed holes would be in the intake at the rear water runners in the heads, but where should the water be routed? Back to the engine somewhere or separate dumps?
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Geronimo36
Charter Member
You can do it a few different ways; 1. Route it to the front of the intake and "T" in with the hoses coming out of your intake (if you have plugs in the intake just use them), 2. Dump overboard, 3. Some guys have bungs welded on the tailpipes for the hoses to connect.
I'm using two #6 lines on either side of the intake which connect together via a "Y" connector that runs a single #6 overboard. If you have low water pressure you might want to tee in to the front of the intake or use smaller lines, possibly as small as 1/8". All you're doing is giving air pockets a place to escape.
I decided to dump overboard so I can peer over the side of the boat to make sure I'm pumping water at anytime.
I'd highly recommend doing it to relieve any air pockets in the heads (especially steel heads) to reduce the potential of detonation on the back cylinders.
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