Engine wont fire
Thread Starter
Pro
Joined: Oct 2006
Posts: 564
Likes: 0
From: London
Engine wont fire
This is driving me crazy.
Just fitted a new engine to a 79 project I'm working on.
But the sob wont start.
It just keeps popping through the carb.
I have set timing as per Lars's papers,
bought no1 cylinder to tdc on compression stroke lined up the dizzy but it still pops through the carb.
The engine is a newly rebuilt unit which i bought and did not rebuild.
Do you think that i may need to degree the cam first before doing timing.
Any ideas.
Just fitted a new engine to a 79 project I'm working on.
But the sob wont start.
It just keeps popping through the carb.
I have set timing as per Lars's papers,
bought no1 cylinder to tdc on compression stroke lined up the dizzy but it still pops through the carb.
The engine is a newly rebuilt unit which i bought and did not rebuild.
Do you think that i may need to degree the cam first before doing timing.
Any ideas.
Team Owner
Joined: Jun 2000
Posts: 38,923
Likes: 1,482
From: Southbound
Cruise-In II Veteran
Timing. You've got a valve open/opening when it should be closed. And, yes, following a cam swap, you should degree the new cam. May not be off much, but could be off just enough to be causing your problem. In your case, if you did not rebuild the engine, you might want to take a look at the timing set. Chain is probably stretched, or she jumped a tooth or two.
Racer
Joined: Aug 2003
Posts: 259
Likes: 2
From: Sacramento CA
Check your firing order again. You are getting spark when an intake valve is open. Either your timing is way off or you have some wires crossed.
1-8-4-3-6-5-7-2
....F....
1.......2
3.......4
5.......6
7.......8
....O....
1-8-4-3-6-5-7-2
....F....
1.......2
3.......4
5.......6
7.......8
....O....
