Big bore 734cc piston broken

Posts : 68 Join date : 2013-03-11 Age : 48

Hi Guys,

Last month, I installed team alba big bore 734cc with cp piston (11:1)
and it works fine, no oil leaking no overheating lot of power everything is
fine.

Thursday morning, I went to the dunes and I was impressed by the amount
of power obtained from this kit with Hotcams stage-3 was a great performance
when I climb the dunes, I've enjoyed playing for a couple of hours.

After that, I went to the flat desert routes but suddenly, I felt a loss of engine power, and I saw oil and smoke comes out of the Siphon break filter but the engine did not stop working
and no overheating. Then, I decided to go back to my truck and load the rhino on the trailer.
https://www.youtube.com/watch?v=ixXyuqJXpfY

When I back to home, barely I could start the engine after many
attempts. The next day, the engine not start completely (spins but not work).

I checked the fuel pump ... No problem
Replaced the spark plug ... New
The spark ... Thick and blue
https://www.youtube.com/watch?v=a4Ly6VXnLAw
I checked the timing ... No problem
Valve clearance ... No problem
I sprayed carburetor cleaner inside throttlebody ... not work

Yesterday, I decided to pull the engine head to see what happened inside. I found the thermostat stuck open.
Pulled the head and I found the piston is broken!

pulled the cylinder I found scratches in intake side!

Big bore 734cc piston broken 017_cut14-50-11_zps3aedd0e0

as well as the piston.

https://www.youtube.com/watch?v=H-d-608o8P0
https://www.youtube.com/watch?v=Au6s7nlS4J4
https://www.youtube.com/watch?v=vGQZ2Rn_KkY

What you think? should I:
1- Replace big bore 734cc cylinder & 105.5mm CP piston 11:1
or
2- Return to stock cylinder 686cc & buy 102mm CP piston 11:1

Thanks in advance.

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 8:47 am

looks like some dust got past the filter...what air filter are you using

Posts : 68 Join date : 2013-03-11 Age : 48

K&N 63-1121 63 Series Aircharger Intake Kit

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 9:19 am

was it oiled good

Posts : 68 Join date : 2013-03-11 Age : 48

WV Hot Rod Rhino wrote:: was it oiled good

It was not very clean but last time I clean it and put enough oil

thanks James for your help

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 9:27 am

i would use a uni from now on....check the drain on the intake to make sure its still there...and check for leaks...you will be able to see where it started....did you check ring gap when you installed

Posts : 68 Join date : 2013-03-11 Age : 48

WV Hot Rod Rhino wrote:: did you check ring gap when you installed

Yes I set gap for the top ring and the second only but not sure for the lower tow thin rings that around the wafer ring

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 11:12 am

Wow. I am going to be pulling my motor apart tonight to see why it it using oil.

Please keep this thread updated.

Posts : 68 Join date : 2013-03-11 Age : 48

Hi Chris,
What do you think:

1- Replace big bore 734cc cylinder & 105.5mm CP piston 11:1
.... or
2- Return to stock cylinder 686cc & buy 102mm CP piston 11:1

Big bore 734cc piston broken 004_zps62bade6b

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 11:58 am

thats not a normal looking cylinder wall. It looks like the coating has come off the wall. Normal wall scoreing doesnt have the "chunks/flakes" like that. it would just look like ground metal. I would be questioning the quality of that cylinder right there. Even if the ring/piston was the problem the cylinder shouldnt flake like that

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 12:02 pm

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 12:47 pm

I want to clarify that that does not look like a normally SCORED cylinder wall.

Posts : 68 Join date : 2013-03-11 Age : 48

chuddly wrote:: thats not a normal looking cylinder wall. It looks like the coating has come off the wall. Normal wall scoreing doesnt have the "chunks/flakes" like that. it would just look like ground metal. I would be questioning the quality of that cylinder right there. Even if the ring/piston was the problem the cylinder shouldnt flake like that

Thanks chuddly,

Do you think the problem due
to the poor quality of the cylinder?

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 2:01 pm

Looks like the nikasil went bad or wasn't coated correctly. I had to many of those things come from crappy companies and never hold up. That's why I wish they would have never came up with nik cylinders. They junk.

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 2:14 pm

Briki wrote:

chuddly wrote:: thats not a normal looking cylinder wall. It looks like the coating has come off the wall. Normal wall scoreing doesnt have the "chunks/flakes" like that. it would just look like ground metal. I would be questioning the quality of that cylinder right there. Even if the ring/piston was the problem the cylinder shouldnt flake like that

Thanks chuddly,

Do you think the problem due
to the poor quality of the cylinder?

I would say its a poor quality cylinder. I cant say if ALL of their cylinders are bad...maybe they had a bad batch or this one got through quality or maybe they just spot check for quality. But i can tell you I have seen ALOT of failed engines before and this one isnt the norm.

In my opinion (just my opinion) It looks like the coating on the cylinder let loose first and then CAUSED the piston damage. Not that the piston chipped then caused the cylinder to rough up. Here is a picture of what it would NORMALLY look like Big bore 734cc piston broken 100678Picture00_00000053188

Big bore 734cc piston broken 100678Picture00_00000053188

notice no coating missing. This picture above i would call "moderate" scoring. I have seen MUCH MUCH worse than that. I would give the company that sold you the cylinder a call and start raising cain on it.

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 3:04 pm

I agree. Can't hurt to try. Regardless, it's gotta be fixed.

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 3:20 pm

x2 on chuddy statement, are all rhino's coated on cylinder

Posts : 68 Join date : 2013-03-11 Age : 48

Thank you guys,

I emailed Team alba racing through eBay where I bought the kit from and I told them what happened and attached pics.

I'm waitting for their response.

Posts : 1638 Join date : 2013-03-10 Age : 51 Location : CA

they are a vendor here, why not PM them too?

Subject: Re: Big bore 734cc piston broken Mon Jun 03, 2013 10:42 pm

yea Nate seems to be good guy when I talked to him before

Posts : 68 Join date : 2013-03-11 Age : 48

ASPENDELL ROVER wrote:: they are a vendor here, why not PM them too?

rhino727 wrote:: yea Nate seems to be good guy when I talked to him before

Thank you guys,
I have sent a private message to Nate.
I appreciate your help. Smile

Subject: Re: Big bore 734cc piston broken Tue Jun 04, 2013 10:29 am

they are at the baja but should be back soon

Subject: Re: Big bore 734cc piston broken Tue Jun 04, 2013 10:47 am

Sent the last batch to Falicon to have bored & re-plated like every other time but when these showed back up they had been bored & sleeved without any notification that was how they were gonna be. We've never run a 700 with a sleeve before James is gonna see if Nate can tell us anything about them or if he's ran them on a 700 before.

Subject: Re: Big bore 734cc piston broken Tue Jun 04, 2013 10:54 am

sleeves are by far the best way to go...they will outlast the other 10 to 1

Subject: Re: Big bore 734cc piston broken Tue Jun 04, 2013 11:07 am

i have 3 in stock

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