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Author Topic:   Engine troubles
dode
Dirt Forum Champ
Total posts: 613
posted April 25, 2005 07:55 AM  
I think your on the right track with the harmonic balancer. Old fuel or a bad accelerator pump could explain the hard starts, but not the dieseling. If the harmonic balancer checks good, you might want to make sure that your cam wasn't advanced 4 deg. with one of those multiple keyway timing chains.

dode
Dirt Forum Champ
Total posts: 613
posted April 25, 2005 08:37 AM  
The outer rings of stock balancers can slip. This usually retards the timings marks.

smallrock98
Dirt Forum Racer

Total posts: 100
posted April 25, 2005 12:53 PM  
Check to see if your distributor was installed 180 degrees. Put your figure in the #1 spark plug hole and manually turn the engine until you feel air being blown out for the compression stroke and line up your timing mark to zero. Remove the distributor cap and rotor should be pointed at the number spark plug position. If it's not, that's your problem.

dode
Dirt Forum Champ
Total posts: 613
posted April 25, 2005 12:54 PM  
Definately check the balancer slipping...

Also - Have you been working on too many of those Ford's lately John?? The firing order of the chevy is opposite to the fords...

OK - try looking at valve lash - could you be hanging a valve open? (will lead to burnt valves in short order...) A quick compression test can detect this too.

Also - the hard starting - is the accelerator pump working? Can you see fuel squirt into the intake? Is the choke setting when you pump the throttle? How does it idle after it's started?

dode
Dirt Forum Champ
Total posts: 613
posted April 25, 2005 03:25 PM  
you got the firing order wrong for one.a small block chevy fires at 1-8-4-3-6-5-7-2..i doubt if you got it at 12345678 that it would even run.your problem is a timing issue and the blue smoke would be wore out rings..

TEAMPCR
Dirt Freak

Total posts: 238
posted April 26, 2005 06:34 AM  
The firing order Dode stated(12345678) I'm pretty doggone sure was a joke. The blue coming out of the pipes was blue fire, I believe. I had the same problem with my mod engine,(blow torch out the exhaust) and found during the off season, I had accumulated some corrossion on the cap, rotor and mag pickup.

dode
Dirt Forum Champ
Total posts: 613
posted April 26, 2005 06:54 AM  
lmao was just helpin you out..now as far as the blow torch out the pipe,check your header gaskets,when they are blown you will get flames out the pipes,there could also be raw unburn fuel left in the exhaust and when it gets in the header it is reigniting..i would also get the lash figured out and set otherwise it will cause major trouble.like i say your problems are in the timing department.you need to figure out what the cam was degreed to,what the crank is set at if it has a tri set gear,and get the total timing set to what the cam recomends.

dode
Dirt Forum Champ
Total posts: 613
posted April 26, 2005 08:38 AM  
sounds like you need a new shop to build your motors if they won't or didn't tell you what cam is in the motor every time i get a motor built i get a cam card with it!!! try setting your lash and checking your balancer for proper timing

drive hard or drive home

dode
Dirt Forum Champ
Total posts: 613
posted April 26, 2005 12:10 PM  
I had problems like that last year too. Turned out that the foam in my fuel cell was coming apart and clogging the fuel filter. Once I got it started on ether the fuel pump could pull it through enough to run. Finally it got so clogged it wouldn't run until we figured it out. I had to change filter and carb. Ran great the rest of the night. Ihad to have the carb rebuilt because the debris ruined the accelerator pump diaphram and clogged up the jets and air passages. I didn't realise that the foam needed to be changed every year.

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