Timing Help
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 751
Likes: 0
From: Lufkin Texas
Timing Help
Is my timing off? I can start the engine run it timing light shows it dead on but I still get a little sputter and backfire out the carb. Any ideas.
Fresh rebuild
Proffesional products intake
Holly 1850
comp 268he cam, lifters, roller tip rockers, pushrods.
Vortec heads set up for 550 lift ported
L82 base engine
Fresh rebuild
Proffesional products intake
Holly 1850
comp 268he cam, lifters, roller tip rockers, pushrods.
Vortec heads set up for 550 lift ported
L82 base engine
Drifting
Joined: Sep 2004
Posts: 1,959
Likes: 1
From: North Bend Ohio
What is the initial advance set at. It should be something like 12 to 16 BTDC.
Backfiring through the carburetor is a lean condition. Open up on the idle mixture screws a little. Try a more aggressive accelerator pump cam.
BigBlockk
Later.....
Backfiring through the carburetor is a lean condition. Open up on the idle mixture screws a little. Try a more aggressive accelerator pump cam.
BigBlockk
Later.....
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 751
Likes: 0
From: Lufkin Texas
I dont know a lot its just the mark on the balancer is right on the timing mark I belive it is at 0. Does this mean I need to advance it more?
Originally Posted by jpatrick636
When you say "dead on", what are the numbers?
Drifting
Joined: Apr 2002
Posts: 1,716
Likes: 4
From: New Baden Illinois
Originally Posted by toupstrio
I dont know a lot its just the mark on the balancer is right on the timing mark I belive it is at 0. Does this mean I need to advance it more?
Le Mans Master
Joined: Apr 2004
Posts: 7,106
Likes: 38
From: Newark DE
Originally Posted by dgruenke
This means that the engine is at Top Dead Center. Your timing should be set at about 8-12 degrees before top dead center (without any vacuum advance). If you are at Top Dead Center (TDC), the engine is firing after it is supposed to, causing your backfire. You need to move the distributor cap until you are at 8-12 degrees before TDC.
If he is using a non-dial back timing light and the marks are aligned at "0" than the would would be at TDC and therefore too retarded.
Maybe the original poster will reply back to what type of timing light he is using, whether it's a regular light or a dial-back light.
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 751
Likes: 0
From: Lufkin Texas
Wish I knew what kind of timing light is there any wat to tell?
Originally Posted by BarryK
depends really on what kind of timing light he is using. If for example he is using a dial back timing light and it's set on the dial at 12º and his timing is actually at 12º than the line on the balancer will be aligned with the "0" index mark on the index plate which means the timing would be dead on.......
If he is using a non-dial back timing light and the marks are aligned at "0" than the would would be at TDC and therefore too retarded.
Maybe the original poster will reply back to what type of timing light he is using, whether it's a regular light or a dial-back light.
If he is using a non-dial back timing light and the marks are aligned at "0" than the would would be at TDC and therefore too retarded.
Maybe the original poster will reply back to what type of timing light he is using, whether it's a regular light or a dial-back light.
Drifting
Joined: Apr 2002
Posts: 1,716
Likes: 4
From: New Baden Illinois
Originally Posted by toupstrio
Wish I knew what kind of timing light is there any wat to tell?
If you still aren't sure, can you post some pictures?
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Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 751
Likes: 0
From: Lufkin Texas
I guess its standard it just has a hot a ground and a lead for #1 plug wire.
Originally Posted by dgruenke
Does your timing light just have the gun, with a trigger, power cable, and impulse cable? If that is all it has, it is just the standard timing light. If it is adjustable, with a dial or digital screen or something like that, then you have a dial-back timing light.
If you still aren't sure, can you post some pictures?
If you still aren't sure, can you post some pictures?
Le Mans Master
Joined: Apr 2004
Posts: 7,106
Likes: 38
From: Newark DE
Originally Posted by toupstrio
I guess its standard it just has a hot a ground and a lead for #1 plug wire.
look at the light itself - does it have a dial on the back or a digital display.
As an example, here is a popular dial back model so you can see the dial on the back
Thread Starter
Burning Brakes
Joined: Aug 2005
Posts: 751
Likes: 0
From: Lufkin Texas
No dial at all.
Originally Posted by BarryK
wiring will be the same for all types......
look at the light itself - does it have a dial on the back or a digital display.
As an example, here is a popular dial back model so you can see the dial on the back
look at the light itself - does it have a dial on the back or a digital display.
As an example, here is a popular dial back model so you can see the dial on the back
