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Cracked a cylinder - too much boost
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risk
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PostPosted: Mon Apr 01, 2013 11:25 am    Post subject: Cracked a cylinder - too much boost Reply with quote

Well I learned my lesson..

Engine was only ran for a couple miles after the blowout to get it home.

I know the cylinder is junk, but are the rings ok to run? I haven't inspected them yet..

I'm currently trying to source a new cylinder, but it looks like I'm gonna have to buy a full set since I can't seem to find anyone selling them individually. Should I go ahead and get new rings?



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Tramsdisciple
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PostPosted: Mon Apr 01, 2013 1:39 pm    Post subject: Reply with quote

Yes get new rings and also look closely at the ring lands. I pup 100 low lead in my turbo and it cracked 2 barrels and the ring land on one piston. Do yourself a favor and get new again and use more octane or less boost. Boost is addictive so better just run race gas.
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Vee Dub Nut
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PostPosted: Mon Apr 01, 2013 4:46 pm    Post subject: Reply with quote

Curious.. How much boost and what brand jug? Run lean, detonate?
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white/red_68
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PostPosted: Mon Apr 01, 2013 5:39 pm    Post subject: Reply with quote

Get mahle cylinders

New Rings....

Check your Mixture.....
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white/red_68
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PostPosted: Mon Apr 01, 2013 5:39 pm    Post subject: Reply with quote

Get mahle cylinders

New Rings....

Check your Mixture.....
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modok
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PostPosted: Mon Apr 01, 2013 5:57 pm    Post subject: Reply with quote

what size cylinder?
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risk
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PostPosted: Mon Apr 01, 2013 5:59 pm    Post subject: Reply with quote

94mm Mahle

I wasn't data logging, so I'm guessing 25-30 psi
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modok
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PostPosted: Mon Apr 01, 2013 6:11 pm    Post subject: Reply with quote

Looks like you can get the AA brand cylinders for about 130$
Mahle is getting scarce, especially in that size
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veedubcrazy
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PostPosted: Mon Apr 01, 2013 6:23 pm    Post subject: Reply with quote

I *think* I have a set of 94mm barrels in the back shed just sitting in the box. I needed long barrels for my 2387 and the stock ones just got put up. Lemme go check... If they check out, you can have them. Hang on...
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risk
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PostPosted: Mon Apr 01, 2013 6:24 pm    Post subject: Reply with quote

veedubcrazy wrote:
I *think* I have a set of 94mm barrels in the back shed just sitting in the box. I needed long barrels for my 2387 and the stock ones just got put up. Lemme go check... If they check out, you can have them. Hang on...


Nice!!
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veedubcrazy
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PostPosted: Mon Apr 01, 2013 6:38 pm    Post subject: Reply with quote

Okay, look here. The barrels, with no other marking saying are 94mm, measure out to 3 11/16" in the widest spot I can see. They are marked 1 thru 4 and (here is an added bonus and to my surprise) that there are matching pistons rings in the barrels. I have no idea why but they are. The long barrels came in a AA box so I put the other barrels in the box. They are used so the barrels and rings are matched. I have no idea how many miles there are but when the itch took for a 2387, it did not take long. If you want pix, I can do that...
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veedubcrazy
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PostPosted: Mon Apr 01, 2013 7:11 pm    Post subject: Reply with quote

Sent you pix. If you want them, pay the shipping and viola! I can send them whenever...
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turbo2go
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PostPosted: Mon Apr 01, 2013 8:17 pm    Post subject: Reply with quote

how much deck are you running?
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risk
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PostPosted: Tue Apr 02, 2013 9:00 am    Post subject: Reply with quote

turbo2go wrote:
how much deck are you running?


I believe it was around .085" plus I have a .040" copper gasket in there. I'll measure it tonight. I'm guessing that having that much deck makes it more prone to crack?
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PostPosted: Tue Apr 02, 2013 10:01 am    Post subject: Reply with quote

Barrels sent... Cool
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risk
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PostPosted: Tue Apr 02, 2013 10:04 am    Post subject: Reply with quote

veedubcrazy wrote:
Barrels sent... Cool


My hero!!
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veedubcrazy
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PostPosted: Tue Apr 02, 2013 10:07 am    Post subject: Reply with quote

Hardly. I just dont throw anything away. Pure chance I clicked this thread. Just use them, I could not.
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cdupuy
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PostPosted: Tue Apr 02, 2013 5:20 pm    Post subject: Reply with quote

Think I would keep the deck in the Head not the Cyl. Just Sayen.
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risk
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PostPosted: Wed Apr 03, 2013 9:20 am    Post subject: Reply with quote

Pulled the 3-4 side apart last night... #4 was cracked too, almost the entire length of the barrel.

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75smith
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PostPosted: Wed Apr 03, 2013 9:24 am    Post subject: Reply with quote

I would say too much deck; especially with an extra .04 shim-what size is your head CC?
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