Visit The Dirt Forum for More Information

Author Topic:   CAN U WELD A CRACKED CYLINDER?
rico 08
Dirt Freak

Total posts: 372
posted October 14, 2002 01:24 PM
THIS MAY SEEM CRAZY BUT I HEAR PEOPLE DOING IT AND I THOUGHT IT WOULD BE A GOOD DISCUSSION.I'VE GOT A 4 BOLT 350 IT BLEW BETWEEN CYL'S AND CRACKED THEM ABOUT 1/2 INCH DOWN THE BORE,CAN THIS BE WELDED?IT WILL BE A BACKUP CLAIMER STYLE ENGINE SO IF IT DOESN'T LAST ALL SEASON WHO CARES,ONE GUY SAID IF YOU TRIED TO MACHINE IT WITH A BORING BAR THE NICKEL ROD WELD WOULD BREAK THE BIT SO I THOUGHT ABOUT USING A RIDGE REAMER(RENTED)AND TRYING THAT AGAIN THIS IS JUST AN EXPERIMENT.

outlawstock17
Dirt Forum Champ
Total posts: 620
posted October 14, 2002 02:49 PM
i've heard all sorts of weird stuff from racers. there's just too much time, money and energy put into building an engine to be beating your head against the wall after it blows up again and trashes some other new parts that you just put in it, or it blows up and you spin out in the oil and wad the whole car up.

i wouldn't chance my limited resources on a welded up cylinder. when i build an engine, i want it to last, not finish last with my parts in a bucket.


tsmith2
Dirt Roller

Total posts: 16
posted October 14, 2002 03:16 PM
don't wast your time welding....spend the xtra $$ to fix it right or it will cost you more in the long run

istock59
Dirt Freak

Total posts: 237
posted October 14, 2002 03:49 PM
Put a sleeve in it, if you can, or pitch it.

You just know it'll let you down when you're leading the feature...

Geffy95x
Dirt Maniac

Total posts: 122
posted October 14, 2002 04:12 PM
Blocks are cheap!
Don't worry yourself with welding.

Monster
Dirt Maniac

Total posts: 135
posted October 14, 2002 04:58 PM
You will spend more money trying to "fix" that block than you will to prep a different one! Usually the guys who say it can be fixed have never done it or had it done. I bought a cast iron repair outfit many years ago, to repair very extensively(and expensive) ported iron heads. It takes me about a week to work up the courage to attempt a repair, and then I average about 50%. A repair job like that would be a minimum of $150, no hone, no bore, no decking, no warranty, and I would have to be pretty much starving to even do it. Other places may be different. IMHO,a backup claimer is pretty much a turrd. Don't try to polish it.

dirtracer14
Dirt Freak

Total posts: 499
posted October 14, 2002 09:19 PM UIN: 23443678
I know you dont want to hear this but.....i had a motor burn a hole between #3 and #5 i could put my finger in the hole in the head and block...i think plug backed out and it leaned it out. Now i took them both in to get fixed and this was what happend we fixed the head put back together put on other motor for 1 race while i saved up to get the block welded. They welded the block and i took it to the engine shop were they just ground on it till it was good enough and made sure the deck was flat put heads back on made 1 race blew the seats out of the head i had fixed( my engine guy was in mexico had to take to local shop). They had heated the whole head to fix it wich i didnt think about the press in seats. So now heads come back off and now i have to pull the peices of seat off the top of my pistons getting them pretty clean we put the heads back on and away we go. About 2 races later i got some real bad blow by(lost top ring from were the peice of seat smashed the piston to the ring. Pull motor for the year and have it reringed 1 new piston and bearings. That was all in a super stock car running gas. Now the next year we put it in a mod on allky wand race the motor hard ....about 22 races end of the year we pull the heads and the thing looks great so we put it in a engine box as a backup spare deal. Ok next year we got a new car and are racing 2 tracks for points leading points at both tracks winning 1 champoinship and have a 2 day show to finish at the other track but befor we go the motor we were running cracked the block....so out comes the old backup we put it in and runs good off to the track (4 hour drive)for 2 days of racing....hot laps....time in....heat race were just stopping em ....them pooooof all kinds of oil and stuff we were done for the night and so was are 2nd championship for the year....the weld had shrank or did something but it leaned out so fast and so hot i could put my finger down the side of the piston were it melted a forged piston like it was ice. Sorry this is so long but i just felt like sharing....and i hope you see the point
HAVE A NICE DAY!!!

[This message has been edited by dirtracer14 (edited October 14, 2002).]

Pickles
Dirt Maniac

Total posts: 144
posted October 15, 2002 11:21 AM
Welding cast iron is always a problem. It requires heat treating (stress reliving) in an oven (made for the purpose)for hours.

rico 08
Dirt Freak

Total posts: 372
posted October 17, 2002 05:21 PM
thanks for the input the scrap bin just got heavier.

Back to the Archives