Author Topic: Intek Block Failure.  (Read 6334 times)

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Offline more4les

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Intek Block Failure.
« on: September 22, 2015, 07:11:14 pm »
I had a catastrophic block failure over the weekend. Was leading the race when the engine grenaded (or so I thought). This is a 49 block with Arias flat top forged pistons. This engine has ran for 3 years with synthetic oil change every other race. I for the life of me don't know what caused the failure. Luckily the only damage was the block and sump. All bolts were still tight in heads and sump. This engine routinely sees 7000 rpm. Big 2 barrel carb, custom Isky cam and..... STOCK 49 rods. All survived. pictures included. Anyone with some ideas?

Lester

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Offline redline

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Re: Intek Block Failure.
« Reply #1 on: September 22, 2015, 08:11:47 pm »
First pic is sort of small. Did it split the block right through the sleeve?
Nevermind, I figured out how to make it larger.

How is the crank bushing? Signs of heat/distress?
A quick assumption would be a clearance issue developed at that point, and the crank hammered on the block until it split.?

You broke it good, thats for certain.

Not the same thing, but I have seen 302 Ford stock blocks in high HP situations split the blocks in half. Right through the cam bores and main bores. Pull the intake, oil pan and main caps, and 2 inline 4's fall to the ground.
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Offline more4les

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Re: Intek Block Failure.
« Reply #2 on: September 22, 2015, 08:31:02 pm »
No sign of any failure or heat issues. Only damage was a single score on the piston that was in the cylinder that cracked.

Lester
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Offline donanza

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Re: Intek Block Failure.
« Reply #3 on: September 22, 2015, 08:42:27 pm »
I know a guy who wasted three inteks like this. Finally figured out the motor plate was flexing, or too light, or something of that nature.

Offline George Herrin

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Re: Intek Block Failure.
« Reply #4 on: September 22, 2015, 09:52:58 pm »
Only time I ever seen anything like that chassis flex~
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Offline PJG56

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Re: Intek Block Failure.
« Reply #5 on: September 23, 2015, 02:54:55 am »
Looks like block stressed from un even mounting plate.
Had one do the same thing,from uneven mounting plate.
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Re: Intek Block Failure.
« Reply #6 on: September 23, 2015, 07:21:20 am »
I know a guy who wasted three inteks like this. Finally figured out the motor plate was flexing, or too light, or something of that nature.

Looks like block stressed from un even mounting plate.
Had one do the same thing,from uneven mounting plate.

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Offline more4les

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Re: Intek Block Failure.
« Reply #7 on: September 23, 2015, 10:07:05 am »
I will definitely check the chassis for any weakness. The chassis has raced for at least 6-7 years. We were racing on a blue clay track that was getting ungodly traction so it could have been a combination of both. No doubt we got lucky in not destroying any internals. Even the piston can be saved. I was thinking of completely rebuilding the chassis this off season so hopefully this will cure it. Also has anyone seen the new "Vanguard 810"? It is basically a 49 Intek that is built for commercial use. The block lists for double the cost of a regular 49 and the sump is about 40% more. Just wondering if they are compatible with what parts I have now.

Lester
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Offline Jeff McKelroy

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Re: Intek Block Failure.
« Reply #8 on: September 24, 2015, 09:30:07 am »
I will definitely check the chassis for any weakness. The chassis has raced for at least 6-7 years. We were racing on a blue clay track that was getting ungodly traction so it could have been a combination of both. No doubt we got lucky in not destroying any internals. Even the piston can be saved. I was thinking of completely rebuilding the chassis this off season so hopefully this will cure it. Also has anyone seen the new "Vanguard 810"? It is basically a 49 Intek that is built for commercial use. The block lists for double the cost of a regular 49 and the sump is about 40% more. Just wondering if they are compatible with what parts I have now.

Lester

I do know the Vanguard 810 rods are forged, might be a nice addition. As far as any improvements/differences in the block and sump, I have no idea, but is certainly worth investigating.

Offline more4les

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Re: Intek Block Failure.
« Reply #9 on: September 24, 2015, 05:10:32 pm »
I do know the Vanguard 810 rods are forged, might be a nice addition. As far as any improvements/differences in the block and sump, I have no idea, but is certainly worth investigating.
The heads are interchangeable although the are now a spread valve (rockers are at an angle to each other) and the head gaskets are fire ringed. I've been using the gaskets foe 2 years now. They are the new bigger valves (not quite as big as the OHV single) and more of a square port on the intake. The pistons appear to be severely dished and the rods look more like the old 44 rods (but if forged most likely stronger than the new 49 rods). Just wondering if the added expense would be worth it.

Lester
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Offline Jeff McKelroy

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Re: Intek Block Failure.
« Reply #10 on: September 24, 2015, 08:52:20 pm »
and more of a square port on the intake.

Lester

Like the Tecumseh single's cylinder head "square"? In other words, round at intake manifold flange, then progressing to square?Aren't these engines fuel-injected BTW? Where is/are the injectors, or is it TBI? I believe these also have a forged crankshaft?

Offline BIG AL 202

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Re: Intek Block Failure.
« Reply #11 on: September 25, 2015, 08:10:54 am »
This is getting interesting.
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Offline Jim Knutson

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Re: Intek Block Failure.
« Reply #12 on: September 25, 2015, 09:10:34 am »
All the new 49 cid "vanguards" I have seen are still carburetors,  and they are using the aluminum intake ( my guess is there were sealing issues with the plastic ones ).
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Offline Jeff McKelroy

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Re: Intek Block Failure.
« Reply #13 on: September 27, 2015, 09:45:07 am »
Thanks for the info everyone. I think I will be looking into the "Vanguard".

Offline FlatheadPuller

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Re: Intek Block Failure.
« Reply #14 on: September 27, 2015, 11:32:25 am »
In the pulling tractor world with the command vtwin when the engine starts producing 90lbft of torque output blocks aren't long living. Weather it's on a dyno or a tractor chassis.
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