1977 Chevy C10 known as SharkBite

[knomadd]

Interesting. At least you've got it figured out. I'd be all about replacing that balancer the next time you have to take it off. Assuming that scratch isn't in the correct spot. If the balancer is marked correctly, then I'd look at replacing the timing tab or timing cover if the tab is permanently attached.

[77ChevySharkBite]

Yeah it was advanced soooo much that after moving it a tooth and advancing it more is when we found it but yeah that's going to be some probably replaced in the future but the mark on the balancer is clearly visible.

[77ChevySharkBite]

Okay so need help once again under an attempt at hard acceleration it kind of bogs and wants to die then seems to do a backfire through the carb any suggestion?

[Sodell]

Your timing is still probably off.

[77ChevySharkBite]

Originally Posted by Sodell

Your timing is still probably off.

Well at least I'll be good at it when I'm done

What I'm planning to do is something I failed to do is find tdc and go from there so wish me luck!

[77ChevySharkBite]

I never told y'all the big surprise! Well everyone since y'all practically are my family y'all should know too........I'm going to be getting married that's the big surprise!

Which comes up to my next point due to a wedding needing to be paid for money will be a HUGE factor now, so much may not get done but I'll try to do small little projects to keep me busy and keep updates coming.

Also I know y'all might call me crazy now, but with all this timing being off and everything and the source of the problem being unknown I'm going to tear the motor out and rebuild it for the most part from the ground up so that I know it's done correctly and I won't have to face these issues later on, so hopefully tonight I can get 67 c10 guy over to help me and the weather clear up and we'll pull the motor tonight and maybe start a little bit of work on it.

[knomadd]

Backfiring through the carb means your timing is too advanced.

[77ChevySharkBite]

But I'm a 0 degrees advance timing so how can I be too advanced?

[knomadd]

Congrats on the engagement!

[knomadd]

LOL, I guess I need to update the page before I post. I seem to be behind with my replies.

Your 0 degrees probably isn't accurate. There are too many unknown variables to determine why it's not running at the proper timing that I just can't answer. I'm taking a guess with everything that follow this, so take it for what it's worth... A guess.

I'm betting the PO scratched a new line in the balancer because he noticed the timing was off. It could be the balancer isn't correctly marked, or it could be that your timing tab is not correct, or mounted incorrectly.

Try doing some more research on the topic to see if you can find anything out. Like run your engine numbers to see what year the block is. If it's not in the early to mid 70's the timing COULD BE different. I don't know for sure, so it could be the same. Look at your timing tab and see if it's fixed to the timing cover, or just bolted on. If it's fixed to the cover, the cover might be incorrect (again I don't know). Like I said, too many variables to know for sure what's happening.

I do know that, typically, when a carb backfires (as opposed to out the tailpipe) the timing is typically too advanced. How old is your dizzy?

[77ChevySharkBite]

Originally Posted by knomadd

LOL, I guess I need to update the page before I post. I seem to be behind with my replies.

Your 0 degrees probably isn't accurate. There are too many unknown variables to determine why it's not running at the proper timing that I just can't answer. I'm taking a guess with everything that follow this, so take it for what it's worth... A guess.

I'm betting the PO scratched a new line in the balancer because he noticed the timing was off. It could be the balancer isn't correctly marked, or it could be that your timing tab is not correct, or mounted incorrectly.

Try doing some more research on the topic to see if you can find anything out. Like run your engine numbers to see what year the block is. If it's not in the early to mid 70's the timing COULD BE different. I don't know for sure, so it could be the same. Look at your timing tab and see if it's fixed to the timing cover, or just bolted on. If it's fixed to the cover, the cover might be incorrect (again I don't know). Like I said, too many variables to know for sure what's happening.

I do know that, typically, when a carb backfires (as opposed to out the tailpipe) the timing is typically too advanced. How old is your dizzy?

It's okay man no problem.

Very true and even it doesn't help to know what kind of rebuild they did on the truck either. Yeah I'll need to do that, very true on knowing the year model numbers would be greatly helpful.

Yeah well I know when we advanced it to 8 degrees initially after finding the mark on the balancer we revved it and it clearly backfired cause it scared me a little once we put it to 0 it seemed to have been running fine, but like I said when I went to go give it good throttle it would kind of bog down so I would let my foot off the gas then I'd hear what sounded like a backfire through the carb and tried it a couple more times but still did the same thing every time.

The dizzy on it, has at least been there a year I would imagine it hasn't been recently replaced just due to the fact you can see it's in good shape but been there for a while.

[knomadd]

A little elaboration on the theory behind backfiring and how timing affects it's location:

When an engine backfires through a carb, it means the combustion cycle has begun before the intake valve is closed, which forces the explosion back through the intake valve, the manifold and the carb. This happens because your timing is telling the spark plug when to fire. When you advance the timing, the spark happens before the piston reaches TDC. The more advanced the timing, the sooner before TDC the spark happens.

When the engine backfires through the exhaust pipe, it means the combustion cycle is happening while the exhaust valve opens. This forces the explosion out the exhaust valve and through the tail pipe. This happens when the timing is too retarded, or after TDC.

[77ChevySharkBite]

Originally Posted by knomadd

A little elaboration on the theory behind backfiring and how timing affects it's location:

When an engine backfires through a carb, it means the combustion cycle has begun before the intake valve is closed, which forces the explosion back through the intake valve, the manifold and the carb. This happens because your timing is telling the spark plug when to fire. When you advance the timing, the spark happens before the piston reaches TDC. The more advanced the timing, the sooner before TDC the spark happens.

When the engine backfires through the exhaust pipe, it means the combustion cycle is happening while the exhaust valve opens. This forces the explosion out the exhaust valve and through the tail pipe. This happens when the timing is too retarded, or after TDC.

Ahh thanks Duane!

I guess what I'll attempt to do weather permitting is try to find TDC tonight because failed to do it in the first place then adjust the timing accordingly sounds good to start with wouldn't you think?

[chevybuilder18]

Originally Posted by 77ChevySharkBite

Well at least I'll be good at it when I'm done

What I'm planning to do is something I failed to do is find tdc and go from there so wish me luck!

number one cylinder on the front driver side... make sure its up

Originally Posted by 77ChevySharkBite

I never told y'all the big surprise! Well everyone since y'all practically are my family y'all should know too........I'm going to be getting married that's the big surprise!

Which comes up to my next point due to a wedding needing to be paid for money will be a HUGE factor now, so much may not get done but I'll try to do small little projects to keep me busy and keep updates coming.

Also I know y'all might call me crazy now, but with all this timing being off and everything and the source of the problem being unknown I'm going to tear the motor out and rebuild it for the most part from the ground up so that I know it's done correctly and I won't have to face these issues later on, so hopefully tonight I can get 67 c10 guy over to help me and the weather clear up and we'll pull the motor tonight and maybe start a little bit of work on it.

Originally Posted by knomadd

Backfiring through the carb means your timing is too advanced.

congrats on the marriage my family! if only i could crash it

Originally Posted by 77ChevySharkBite

But I'm a 0 degrees advance timing so how can I be too advanced?

Originally Posted by 77ChevySharkBite

It's okay man no problem.

Very true and even it doesn't help to know what kind of rebuild they did on the truck either. Yeah I'll need to do that, very true on knowing the year model numbers would be greatly helpful.

Yeah well I know when we advanced it to 8 degrees initially after finding the mark on the balancer we revved it and it clearly backfired cause it scared me a little once we put it to 0 it seemed to have been running fine, but like I said when I went to go give it good throttle it would kind of bog down so I would let my foot off the gas then I'd hear what sounded like a backfire through the carb and tried it a couple more times but still did the same thing every time.

The dizzy on it, has at least been there a year I would imagine it hasn't been recently replaced just due to the fact you can see it's in good shape but been there for a while.

not enoughn retarding... a normal 350 takes up to 45 degrees of retarding.. so losen the dizzy and make sure its running up to parr

[77ChevySharkBite]

Originally Posted by chevybuilder18

number one cylinder on the front driver side... make sure its up




congrats on the marriage my family! if only i could crash it



not enoughn retarding... a normal 350 takes up to 45 degrees of retarding.. so losen the dizzy and make sure its running up to parr

Yeah that's what I'm going to look into tomorrow.

As I might not mind it that much, the future wifey might not be so up to par with that idea

my plan is that tomorrow were going to find tdc and just start to slowly put it back together and get it running and working right. So hopefully I'll have good news tomorrow.

[77ChevySharkBite]

Well as you all know my truck has been in it's primer state for about 6 months minimum and well I knew I always need to get some paint on it for temporary just in case it rained we'll it's rained a lot this past week and supposed to rain some more. So I felt it was in need of a color make over, now I know y'all know it's going to be blue in the end result however they didn't have my blue at lowe's soooo I went red as it is one of my favorite colors. Let me know what you guys think I know there's some "splotches" and paint runs but I'm going to go to the store here shortly to pick up some more paint to touch it up and get it looking better. I think it's a big improvement from having to look at primer all the time, would you agree?

[67 c10 guy]

You gonna post a red truck picture

[77ChevySharkBite]

My bad might help if I put in links huh?

[knomadd]

Looks good for rattle can. Hope you've got some 000 steel wool. Looks like you'll need a bunch of it to clean off your windows. It'll clean up chrome too, just don't use it on painted or plastic parts.

[77ChevySharkBite]

Originally Posted by knomadd

Looks good for rattle can. Hope you've got some 000 steel wool. Looks like you'll need a bunch of it to clean off your windows. It'll clean up chrome too, just don't use it on painted or plastic parts.

Thanks for the heads up and compliments Duane I'm going to have to remember that!

I'm thinking at a later date since it will be red for a long time putting some black stripes where the original stripes were on the hood from when I bought it

[knomadd]

sounds like a good idea.

[77ChevySharkBite]

Well....... I wish I had better news but I don't looks like the only good news is that II painted the truck which I'm starting to like and have it grow on me so we'll see what happens with that.

On that note I have found the real problem with the timing checked everything and made sure the truck was on TDC and well it was as perfect as can be, so it has to be in the timing chain, so $100 later I have ordered a new timing chain and gear set and balancer on the way from summit, so looks like I know what I'll be doing this weekend.

Another big thanks to my friend 67 c10 guy for coming over and helping me out once again he's really a life saver so thanks 67 c10 guy appreciate it!

[Claytona08]

I say paint the rest of the truck red and drive it around awhile!

[77ChevySharkBite]

Originally Posted by Claytona08

I say paint the rest of the truck red and drive it around awhile!

Yeah, well right now the whole truck is red being I don't have a bed

Just going to do a couple more touch ups and then I'll be done!



As this red continually grows on my my idea IF I paint it red with be take the original paint job style just do red, & white, with black stripes but we'll see what happens but for right now I'm definitely going to enjoy this red!

[Greenlee]

Originally Posted by 77ChevySharkBite

Yeah, well right now the whole truck is red being I don't have a bed

Just going to do a couple more touch ups and then I'll be done!



As this red continually grows on my my idea IF I paint it red with be take the original paint job style just do red, & white, with black stripes but we'll see what happens but for right now I'm definitely going to enjoy this red!

Do you need a bed? I have a perfect bed. I'm almost afraid to ask after trying to sell you a motor.