Bracket Talk
SMALL BLOCK ALKY…
November 20, 2023, 09:15 AM
vetmanSMALL BLOCK ALKY…
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
November 20, 2023, 09:41 AM
Joneszquote:
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.
November 20, 2023, 01:51 PM
pauleyWhomp. Mine cracked the same way. Was told by piston manufacturer wrist pin was too weak. Bob installed thicker wall wrist pins.
ep
November 20, 2023, 01:53 PM
pauleyFor those wondering you dont have to guess what happens when it happens.
November 20, 2023, 02:53 PM
DragRaceResultsquote:
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.
November 20, 2023, 04:40 PM
WHOMPWHOMPFrom my understanding I had the gooder wrist pins already
November 20, 2023, 05:20 PM
WHOMPWHOMPquote:
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…
November 20, 2023, 05:31 PM
DragRaceResultsDon't remember exactly, but it was for sure wall thickness. Here is some good info.
https://blog.diamondracing.net...o-upgrade-wrist-pinsNovember 20, 2023, 06:07 PM
WHOMPWHOMP.180 wall thickness now
November 21, 2023, 07:56 AM
pauleyI want to say bob put .250 wall pins in mine over the summer when this happened to me
ep
November 21, 2023, 08:03 AM
CURTIS REEDquote:
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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November 21, 2023, 08:38 AM
pauleysame 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
November 21, 2023, 08:48 AM
DragRaceResultsWhat's really crazy is that we are even talking about these pins flexing! Pretty amazing if you think about it.
November 21, 2023, 10:23 AM
WHOMPWHOMPquote:
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
November 21, 2023, 01:19 PM
Buckyquote:
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
November 22, 2023, 08:26 AM
DragRaceResultsSo Bell, what does your builder think?
November 22, 2023, 03:08 PM
M120Who's Bell?
Sounds like you are talking to yourself.
November 22, 2023, 03:24 PM
WHOMPWHOMPquote:
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…
November 22, 2023, 03:25 PM
WHOMPWHOMPquote:
Originally posted by M120:
Who's Bell?
Sounds like you are talking to yourself.
And I’m BELL..
November 22, 2023, 07:46 PM
rustypistons should wear out not crack
honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224
