I spoke with Stewart today and they said EVERY valve had rust on it. I'm wondering if I got bad gas that was full of water?
On Mon, Oct 5, 2009 at 3:52 PM, Jason C <[email protected]> wrote: > Lack of lubrication in the valve guides? > > > > > > > > > > Larry Alster > > > > 91 Miata White Knight > > 92 Miata Silver Bullet > > 92 Miata Honey B > > 04 MSM MX-5 Whooosh > > 06 WRX STi Subie > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Blake Thompson > *Sent:* Monday, October 05, 2009 1:19 PM > *To:* <[email protected]> <[email protected]> > *Subject:* 2008 Crate head failure > > > > wtf did i do this thing after only 10 races? Any ideas? > > > > Cylinder 4 - exhaust valves unseated > > http://btdtracing.com/gallery/d/10706-2/head2.jpg > > Cylinder 1 - exhaust valve extended or bent: > > http://btdtracing.com/gallery/d/10703-2/head.jpg > > > > Labor day weekend (a month ago, now) I raced. The car performed well, I > didn't notice any power issues. I brought the car home and parked it. > About two weeks ago I started and it sounded like shit, like it was running > on two cylinders. I assumed the coil had GTSd. I didn't bother with it > until this weekend when it wouldn't start at all. I started with the CAS > then the Coil then the ignitor before I got it running again, but she still > ran like shit. > > So I started a leak down. Cyl 1 - 30%, Cyl 4 - 100% (yes, on the > compression stroke). Attached is a picture of the exhaust valve in cylinder > 1. Cylinder 4 it looks like both valves are out about 1/16" or more. > Cylinder 1 is at least 3/16" > > So the head is off my car, on its way to Gasoline alley. But my question > is, *what did I do to cause this?* I've not missed a shift and I dont rev > past the limiter. The motor is a Mazda crate which I bought in May of last > year. It has maybe 10 races on it. I run Royal Purple XPR 10w30 (i think, > off the top of my head) in the car and religiously change the filter every > race and oil every 2. > > I noticed my header was cracked as well, i donno if this was the cause or > the result of bad valves. > > The valve springs look fine and dandy, all operating well, the cams move > smoothly. The valve, however, is very stiff and I couldn't move it with my > bare (bear!) hand, nor did it move when i rotated the cam. > > There is a picture attached of cyl 4 here, the ex valves again are the ones > in question, they don't seem to be seated properly. I have a feeling one of > the cylinders has been screwed for a while > > To answer your other questions, the AFM is untuned and I thought I was > using a pretty conservative timing. I ran 87 for practice and qual at the > mile and then switched to 110 from a nearby pump for the race. I typically > run whatever the track gas is but that wasn't available at the mile. > > > > BTW, this is a 90 spec miata with a 1.6L crate bought from mazda in May of > 2008. It's got maybe 1000 miles on it, 400 of which were break in miles on > the interstate :p > > > > -Blake > > SM#97 > > > -- > http://BTDTRacing.com <http://btdtracing.com/> - World Champion Miata > Parts Sales. Now in HD! > > Our ebay store: http://stores.ebay.com/btdtracing-36 > or Subscribe to our active listings page: > http://esssl.ebay.com/GetListings/btdtracing36?fmt=g > > This is our decision, to live fast and die young. > We've got the vision, now let's have some fun. > > -----Inline Attachment Follows----- > > _______________________________________________ > Miatapower mailing list > [email protected] <http://mc/[email protected]> > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > > -- http://BTDTRacing.com - World Champion Miata Parts Sales. Now in HD! Our ebay store: http://stores.ebay.com/btdtracing-36 or Subscribe to our active listings page: http://esssl.ebay.com/GetListings/btdtracing36?fmt=g This is our decision, to live fast and die young. We've got the vision, now let's have some fun.
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