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[Skidude]

A little too much for the flatly. Broke the block and the crank.

 

[Prorookie34]

A little too much for the flatly. Broke the block and the crank.

Sorry for your loss.

 

[OVALTECH1]

that’ll buff out

 

[sundog]

We can rebuild him, faster and stronger.

 

[Chris Cooper]

We can rebuild him, faster and stronger.

That brings back memories ...

 

[sundog]

That brings back memories ...

The six million dollar flathead

 

[OVALTECH1]

The six million dollar flathead

I got a few of those... 1,500 dollars worth of billet goodies stuffed in a 25 dollar tiller block

 

[Skidude]

This is what did it. It was a .200 stroker with big valves.

 

[Gkh]

So I'm new to this. Did it get turned to hard to much rpm

 

[Skidude]

So I'm new to this. Did it get turned to hard to much rpm

Not really, it just gave up to fatigue. This engine was originally built in 1995 and was retired in 1997. Then, it was pretty much just a limited that I put a homemade .200 stroker crank in. I tore it down in 1997 to rebuild and never reassembled it. It sat in pieces in a box for over 20 years. I got back into racing last year and decided it was time to put it back together. I went ahead and put bigger valves in it and done a little for work on the ports, deck and head. The block had been braced internally with 3/8 aluminum plate welded in, side cover too.

 

[OVALTECH1]

bushing block ?

 

[Skidude]

bushing block ?

Yep, not even a DU.

 

[OVALTECH1]

I like the bushing block better myself. Little more meat on that side of the case.

 

[Skidude]

A few pics from the tear down.

 

[OVALTECH1]

boom! If you gonna do it.., do it !

 

[Chris Cooper]

Yikes - you get a gold star ! I’ve not seen a case split like that

 

[CarlsonMotorsports]

2 piece crank - very innovative. Yamaha has used them for years....The late Mike Clements had some for the flatties -- I've still got one here in the shop. LOL
Yea, it came apart alright.
FWIW, that old Horstman H beam rod held up nicely though.
Have you diagnosed what caused the catastrophic failure yet? Rod bearing seized? Crank flex where it was stroked?
Always a challenge doing an autopsy on engines, especially when they've come apart as much as this.


-----
Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
Carlson Motorsports on Facebook
32 years of service to the karting industry ~ 1Cor 9:24
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com

 

[flattop1]

You add the crank supports .?
Looks like something Summerlin did .

 

[Skidude]

Yes, I added the supports. I’m pretty sure it failed due to the modded crank. It just gave up. It was a stock small PTO crank welded up with Stelite and reground to add stroke. Moved the center point .100, for a .200 over stroke. All bearing journals looked good. The rod bearing was chewed up a bit on the edge from where the broken crank got it.

 

[Skidude]

2 piece crank - very innovative. Yamaha has used them for years....The late Mike Clements had some for the flatties -- I've still got one here in the shop. LOL
Yea, it came apart alright.
FWIW, that old Horstman H beam rod held up nicely though.
Have you diagnosed what caused the catastrophic failure yet? Rod bearing seized? Crank flex where it was stroked?
Always a challenge doing an autopsy on engines, especially when they've come apart as much as this.


-----
Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cutz
www.CarlsonMotorsports.com
Carlson Motorsports on Facebook
32 years of service to the karting industry ~ 1Cor 9:24
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com

Yes, crank flex. I was running the clutch you built for me on this engine. The Horstman H beam is a beast. I’ve never seen nor heard of one breaking. And I had cut this one a good bit to help with clearancing the rotating assembly.