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Author Topic:   Missing for most of race.
mod2_x
Dirt Full Roller

Total posts: 38
posted May 08, 2005 05:16 AM  
Here is what is happening. At idle the thing sounds good. Go out for heat race and it acts like its not on all 8 cly. Thought it may be moisture in the fuel so I added some dry gas and let car run in the pits. Go out for feature and same thing popen and a missing. 5 or 6 laps left to run and bam it ran great. This is the second time the car has been out this year with the same results. I do think its moisture some where.
Anybody else have an thoughts on this?

hobby39
Dirt Maniac

Total posts: 112
posted May 08, 2005 07:04 AM  
quote:
Originally posted by mod2_x:
Here is what is happening. At idle the thing sounds good. Go out for heat race and it acts like its not on all 8 cly. Thought it may be moisture in the fuel so I added some dry gas and let car run in the pits. Go out for feature and same thing popen and a missing. 5 or 6 laps left to run and bam it ran great. This is the second time the car has been out this year with the same results. I do think its moisture some where.
Anybody else have an thoughts on this?


hobby39
Dirt Maniac

Total posts: 112
posted May 08, 2005 07:15 AM  
Sorry don't know what happened to the last post. A couple other racers i hang with have had water in the gas recently and here is what i saw. water is heavier then gas so it sits on the bottom of the tank which is where the pickup tube is. we pulled the foam out of the cell at the track there was just a tad of water sitting in the bottom of the cell so we syphoned the water out and it was still running terrible so we drained the carb and it was full of water started it up and it ran fine. My assumption is that the water gat sucked up first and eventually you got to the good gas. That being said there are a lot of other things that act like having water in your fuel. If you have a drum of fuel I would take some fuel put it in a glass container and see what you have.

ryan
Dirt Forum Champ
Total posts: 776
posted May 08, 2005 07:19 AM  
We usually throw in a container of HEET every other week or so.

mod2_x
Dirt Full Roller

Total posts: 38
posted May 08, 2005 08:36 AM  
Thanks. I was thinking about draining everything and starting with fresh gas. The gas that is in the car is mixed with about 10 or 15 gallons that was left in it over the winter. I dont heat the garage when I'm not working on the car plus the weather around here has been swinging from warm to cold. This may help cause the fuel to draw moisture not sure though. I have been puting a bottle of heet in both times I have ran the car but it didnt seem to help unless there is alot more water then what I would think. Any other oppinions will be welcomed.

Mr. Badboy
Dirt Full Roller

Total posts: 29
posted May 08, 2005 09:13 AM  
Gas that is more than 60 to 75 days old will go flat, and the ingrediants in it will varnish any fuel passage in the carburetor, and will varnish any moving part in the carburetor. When the old gas burns it will have an odor like old gas out the exhaust, which will be totally different than fresh fuel smells. It may be worth reading all the spark plugs to see if you have a problem with one or two cylinders misfiring, or if the problem can be blamed totally on the fuel.

[This message has been edited by Mr. Badboy (edited May 08, 2005).]

[This message has been edited by Mr. Badboy (edited May 08, 2005).]

ryan
Dirt Forum Champ
Total posts: 776
posted May 08, 2005 11:58 AM  
Have you checked your rockers to make sure they are not cracked or broke. I check lash and inspect rockers every week where I know for others its a monthly deal. Almost sounds like your cam is going down.

mod2_x
Dirt Full Roller

Total posts: 38
posted May 08, 2005 02:31 PM  
I will check everything Monday.The only other thing I noticed was it was hard to get the timing set. Seemed like I couldnt dial it in. The timing mark on the balancer was bouncing from side to side of the timing pin by 20 degrees or so.

ryan
Dirt Forum Champ
Total posts: 776
posted May 08, 2005 02:39 PM  
Check your distributor and timing chain

mod2_x
Dirt Full Roller

Total posts: 38
posted May 09, 2005 05:34 PM  
I would like to thank everyone for the info. Here is what I found and am pretty sure what was causing my problem. I use a mallory unilite dist with a mechanical advance which I have locked. On the base plate there are 2 tabs that stick up which stop the upper plate along with the springs. For some reason both tabs were broken and there were metal filings all over inside the cap. I found one on the bottom of the dist that was ground down and the other was on top of the plate with the photo eye. between the shavings and that chunk of metal flying around I am sure that caused my problem. I orderd a new dist but I think this one will still be ok due to the fact that it is locked anyway. Any one feel the same as I do on this. I am going to call mallory in the morning to get their thoughts on this also.

mod2_x
Dirt Full Roller

Total posts: 38
posted May 10, 2005 07:44 PM  
Called Mallory today and the tech guy told me I could run it like is due to it being locked anyway. No reply as to why the timing tabs were broke or how. I will give it a shot but a msd is on its way.

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