Blew my new motor
- Thread starter TYTILIDIE
- Start date
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Quickstop [UK]
Combating adversyty.
Re: Blew my new motor
If it breaks in the right place, would you have a really badly tuned V4?
If it breaks in the right place, would you have a really badly tuned V4?
bezerk
New member
leroy
Donating Member
Re: Blew my new motor
Not really. The front and back halves of the crank need to turn together for the valves and ignition to sync. The distributor is driven off the back half and the camshaft is driven off the front.
Jim
Not really. The front and back halves of the crank need to turn together for the valves and ignition to sync. The distributor is driven off the back half and the camshaft is driven off the front.
Jim
STORM TROOPER
New member
TYTILIDIE
METH HEAD
Re: Blew my new motor
Heads look just fine. Not a mark on the valves. It looks like I have some pretty good options here but wont know for sure until Tuesday. What do you guys think of the same "type" of crank (offset ground with small journals) that is billet? Would you run with that? My machine shop happens to have one laying around for 1k. Not sure its worth it or not but what do you guys think? This would save me from having to buy all new pistons to go back to stock style crank.
Heads look just fine. Not a mark on the valves. It looks like I have some pretty good options here but wont know for sure until Tuesday. What do you guys think of the same "type" of crank (offset ground with small journals) that is billet? Would you run with that? My machine shop happens to have one laying around for 1k. Not sure its worth it or not but what do you guys think? This would save me from having to buy all new pistons to go back to stock style crank.
TYTILIDIE
METH HEAD
Re: Blew my new motor
This crank was from Ry's old motor. I am not sure where it originally came from but he used for a long time and beat the hell out of it. Maybe he can chime in and give more details. I got from his old motor that I bought, the complete bottom end.
This crank was from Ry's old motor. I am not sure where it originally came from but he used for a long time and beat the hell out of it. Maybe he can chime in and give more details. I got from his old motor that I bought, the complete bottom end.
Don W.
Stab it and steer it
Re: Blew my new motor
I did a 454 that had a horrible knock. All it was was busted ring land.
I did a 454 that had a horrible knock. All it was was busted ring land.
leroy
Donating Member
Re: Blew my new motor
Yep you're right....wasn't thinking again. Thanks for keeping me straight Dave.
Jim
Yep you're right....wasn't thinking again. Thanks for keeping me straight Dave.
Jim
1madgumby
New member
Re: Blew my new motor
Dont feel bad mine did the same thing.
Dont feel bad mine did the same thing.
I can assure I watch as many gauges as possible. I had the truck tuned for about 10 psi and I was running about 8. AFR's looked great, temps looked normal and oil pressure was good. I tore the block down and here is what I found.
I was afraid to run this crank as it was and I didn't listen to myself. Lesson learned I guess. So now I have a snapped crank and two wasted pistons. These pistons were custom and I am sure this is going to be expensive no matter what route I go. Everything else looks great. Whats is odd is that there really isn't a whole lot of waste in the motor. I guess since it broke and didn' keep turning that would explain that.
1madgumby
New member
WyoSyclone
Active member
Re: Blew my new motor
Mike, just curious, did you Plastigage the mains when you put the motor together? Back when I was building Cat engines, we'd plastigage both the saddle half, and the cap half... any line-bore problem would be immediately evident with this method. If all clearances were fine, I would sure think that it would point to a defect in the crank with the minimal boost you exposed it to.
Mike, just curious, did you Plastigage the mains when you put the motor together? Back when I was building Cat engines, we'd plastigage both the saddle half, and the cap half... any line-bore problem would be immediately evident with this method. If all clearances were fine, I would sure think that it would point to a defect in the crank with the minimal boost you exposed it to.
midnightbluS10
Banned
Re: Blew my new motor
Wouldn't that have been the case when Ry owned it. According to Mike, Ry beat the hell out of it.
Wouldn't that have been the case when Ry owned it. According to Mike, Ry beat the hell out of it.
cheatham2492
New member
Re: Blew my new motor
WOW bro too bad....
Im bummed for ya.
Cheatham
WOW bro too bad....
Im bummed for ya.
Cheatham
TYTILIDIE
METH HEAD
Re: Blew my new motor
Yes I did plastigauge. Top and bottom. Everything checked out. That 9 psi or so I was running felt a hell of a lot faster/stronger than the 20 I was running on the 20g with meth. I didn't even get til the alky reservoir on this build yet. I am hoping to get this thing back together with in about a month. It really depends on how fast I can sell these engine parts I have that came from a 4.3 that was built for an airplane. I wont be bale to even take pics of it until Tuesday. If I can sell all that fairly fast, it will finance at least a new crank, the rest I can realistically buy right now. I just need to get everything here in front of me first to see what I really have to work with.
Yes I did plastigauge. Top and bottom. Everything checked out. That 9 psi or so I was running felt a hell of a lot faster/stronger than the 20 I was running on the 20g with meth. I didn't even get til the alky reservoir on this build yet. I am hoping to get this thing back together with in about a month. It really depends on how fast I can sell these engine parts I have that came from a 4.3 that was built for an airplane. I wont be bale to even take pics of it until Tuesday. If I can sell all that fairly fast, it will finance at least a new crank, the rest I can realistically buy right now. I just need to get everything here in front of me first to see what I really have to work with.
nallj92
Active member
Re: Blew my new motor
Remember that 9psi is a bit more due to your higher compression pistons..... sorry to hear about your crank. hopefully most is salvageable
Quickstop [UK]
Combating adversyty.
Re: Blew my new motor
:rotf:
Man it should really fly then!!!
Hope you find a good crank this time..!
~Scott
:rotf: