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SMALL BLOCK ALKY…
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DRR Trophy
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Yes I would say that piston has been "kissing" head on quelch side-never seen that in my small blocks with Ross 4032 piston and tool steel pins 14.5 on alky


The difference between ignorance and stupidity. Ignorance is lack of knowledge. Stupidity is the inability to learn. Don't be stupid
 
Posts: 428 | Location: des moines iowa | Registered: January 10, 2020Reply With QuoteReport This Post
DRR Sportsman
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quote:
Originally posted by rusty:
possible weaking from valve relieif process
piston hitting head
appears piston may not be setup for application including pins and location
just thoughts to consider


This and more than likely the wrong camshaft creating excessive cylinder pressure with the added volume of the alcohol.
 
Posts: 130 | Location: Over here | Registered: November 28, 2007Reply With QuoteReport This Post
DRR Sportsman
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Whomp. Mine cracked the same way. Was told by piston manufacturer wrist pin was too weak. Bob installed thicker wall wrist pins.

ep
 
Posts: 777 | Location: dodging double wides... | Registered: November 28, 2007Reply With QuoteReport This Post
DRR Sportsman
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For those wondering you dont have to guess what happens when it happens.
 
Posts: 777 | Location: dodging double wides... | Registered: November 28, 2007Reply With QuoteReport This Post
DRR / Crew
Picture of DragRaceResults
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quote:
Whomp. Mine cracked the same way. Was told by piston manufacturer wrist pin was too weak. Bob installed thicker wall wrist pins.


Correct, been down that road. Made the change. No issues. From what I was told it's about an 800 hp deal with the small blocks. Cup cars figured it out for us back in the day.
 
Posts: 2157 | Location: Gallatin, TN - U.S.A. | Registered: October 12, 2009Reply With QuoteReport This Post
DRR Pro
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From my understanding I had the gooder wrist pins already
 
Posts: 1275 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
DRR Pro
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quote:
Originally posted by DragRaceResults:
quote:
Whomp. Mine cracked the same way. Was told by piston manufacturer wrist pin was too weak. Bob installed thicker wall wrist pins.


Correct, been down that road. Made the change. No issues. From what I was told it's about an 800 hp deal with the small blocks. Cup cars figured it out for us back in the day.
What was recommended at the 800hp level…
 
Posts: 1275 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post



DRR / Crew
Picture of DragRaceResults
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Don't remember exactly, but it was for sure wall thickness. Here is some good info.

https://blog.diamondracing.net...o-upgrade-wrist-pins
 
Posts: 2157 | Location: Gallatin, TN - U.S.A. | Registered: October 12, 2009Reply With QuoteReport This Post
DRR Pro
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.180 wall thickness now
 
Posts: 1275 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
DRR Sportsman
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I want to say bob put .250 wall pins in mine over the summer when this happened to me

ep
 
Posts: 777 | Location: dodging double wides... | Registered: November 28, 2007Reply With QuoteReport This Post
DRR S/Pro
Picture of CURTIS REED
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quote:
Originally posted by pauley:
I want to say bob put .250 wall pins in mine over the summer when this happened to me

ep


EP, did they shorten up the pin any? I've seen where pins have been shortened to stiffen them and a strutted piston was used. It takes less wall thickness if they are shorter but the piston design changes.



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2018 Div4 Goodguys Hammer award winner
 
Posts: 3149 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
DRR Sportsman
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same length just thicker. piston manufacturer is aware of the problem and says thicker pins should fix. mine is a 427 similar to whompers just not as good. mine cracked over the summer and whomper told me exactly what it was. mine cracked all of the way through to the wrist pin. probably had one more crank left in it. i got lucky.

Whomp says he is getting around 220 1/8 mile runs. i had close to 250 to 300 runs, 1/8 and 1/4 mile.

ep
 
Posts: 777 | Location: dodging double wides... | Registered: November 28, 2007Reply With QuoteReport This Post
DRR / Crew
Picture of DragRaceResults
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What's really crazy is that we are even talking about these pins flexing! Pretty amazing if you think about it.
 
Posts: 2157 | Location: Gallatin, TN - U.S.A. | Registered: October 12, 2009Reply With QuoteReport This Post
DRR Pro
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quote:
Originally posted by pauley:
same length just thicker. piston manufacturer is aware of the problem and says thicker pins should fix. mine is a 427 similar to whompers just not as good. mine cracked over the summer and whomper told me exactly what it was. mine cracked all of the way through to the wrist pin. probably had one more crank left in it. i got lucky.

Whomp says he is getting around 220 1/8 mile runs. i had close to 250 to 300 runs, 1/8 and 1/4 mile.

ep
BOB don’t think this is my issue though
 
Posts: 1275 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post



DRR Elite
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quote:
Originally posted by DragRaceResults:
What's really crazy is that we are even talking about these pins flexing! Pretty amazing if you think about it.


I never gave it a thought, until after I should have. The turbos will find that weak spot eventually. It was the pins.


Foxtrot Juliet Bravo
 
Posts: 6453 | Location: Illinois | Registered: July 08, 2004Reply With QuoteReport This Post
DRR / Crew
Picture of DragRaceResults
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So Bell, what does your builder think?
 
Posts: 2157 | Location: Gallatin, TN - U.S.A. | Registered: October 12, 2009Reply With QuoteReport This Post
DRR Sportsman
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Who's Bell?

Sounds like you are talking to yourself.



Cool
 
Posts: 622 | Location: Atco, NJ | Registered: March 14, 2002Reply With QuoteReport This Post
DRR Pro
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quote:
Originally posted by DragRaceResults:
So Bell, what does your builder think?
Got to get it apart first….but I guarantee it’s a cracked piston doing just like the last time….leaning toward the fuel being in the back with an electric pump….My argument is how would it make it 200+ runs if it was detonating…
 
Posts: 1275 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
DRR Pro
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quote:
Originally posted by M120:
Who's Bell?

Sounds like you are talking to yourself.
And I’m BELL..
 
Posts: 1275 | Location: USA | Registered: December 04, 2008Reply With QuoteReport This Post
DRR Pro
Picture of rusty
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pistons should wear out not crack


honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224

 
Posts: 1468 | Location: texas | Registered: February 17, 2006Reply With QuoteReport This Post
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