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General Forums => Air Speed Lounge => Topic started by: purple turd on March 06, 2014, 08:31:06 PM

Title: broken motor
Post by: purple turd on March 06, 2014, 08:31:06 PM

So im im driving from kelowna to vernon on saturday afternoon in my 70 bug when all I start hearing a bit of extra noise from the engine area. Sounds like a broken baffle in the muffler maybe. Hmm, so I slow a bit noise calms...speed up gets louder. Ok now it sounds like a rod knock.ah crap. So I baby it home, stopping at the grocery store first. (Shut off the car n fired it back up a few minutes later) went home. Pulled the engine out and apart.  Rods look fine, bearings perfect. End play ok, a little bearing material in the screen. Split the case.holy crap the crank is sheared completly in half. Looks like it splitaround a balancing drill hole. Everything else Iis fine to the point I could actually re use the main bearings. It didnt even vibrate although I didnt rev much.  Sorry for the long story but I thought some may get a kick out of it. Cant figure out pics or I would post a few

Title: Re: broken motor
Post by: josh on March 07, 2014, 12:32:09 AM

You broke your crank in half but still managed to baby it home? :19:

Title: Re: broken motor
Post by: purple turd on March 07, 2014, 06:56:22 AM

Broken completly in half across a counter weight.didnt even lose oil pressure.should have catastrophic but everything else is fine.block, rods, bearings all fine

Title: Re: broken motor
Post by: josh on March 07, 2014, 08:32:21 AM

At first glance sure.....but if it were me, I'd be going over everything with a fine tooth comb! I'd be really surprised if you didn't bend a rod or something?

Title: Re: broken motor
Post by: BUSDADDY on March 07, 2014, 08:59:56 AM

^X2^
All that twisting and clanging can't be good for bearing saddles and other parts that are used to holding things that only move in one direction.

Title: Re: broken motor
Post by: purple turd on March 07, 2014, 10:59:31 AM

the crank only had a backlash of .015 whacking back and forth. regardless im having avr building a stroker. Darren didn't have time

Title: Re: broken motor
Post by: Chris on March 08, 2014, 03:00:48 PM

Click additional options below the message box and you can upload 2 pictures at a time.

Title: Re: broken motor
Post by: purple turd on March 08, 2014, 07:27:08 PM

2 there will be more

Title: Re: broken motor
Post by: purple turd on March 08, 2014, 07:29:05 PM

More

Title: Re: broken motor
Post by: purple turd on March 08, 2014, 07:31:26 PM

More

Title: Re: broken motor
Post by: BUSDADDY on March 08, 2014, 07:40:57 PM

You need a better camera!
I can't see close enough to determine if it was cracked for a while or let go all at once, did it make any odd clicky noises in the weeks prior to the failure?
Regardless props for blowing one up like that, when you break it might as well break it really good, well done!

Title: Re: broken motor
Post by: purple turd on March 08, 2014, 08:31:48 PM

Samsung galaxy tab.sorry. theres no "rub" marks like it was gradual. And not even any wear marks from driving it home. Its like it got brittle n broke clean. Maybe in a former life it got severely overheated. Guess I will never know. On a better note I ordered my 1902 today.hope to be on the road within 2 weeks

Title: Re: broken motor
Post by: purple turd on March 13, 2014, 01:33:25 PM

anyone else running a 74x90.5 1902-1903? I have one being built and very curious about the power gain. 100 cam dual kadrons. stepping up from 1641 with same specs