Ka BooooM
Thread Starter
Intermediate
Joined: Sep 2013
Posts: 37
Likes: 0
From: san jose california
Ka BooooM
Well I got ambitious 2 months ago and decided to install all of the ignition heat shields on my '68 small block.That project was short lived as i discovered i didn't have all of the correct pieces. Ok, on to project number two. A tune up. You know the the easy stuff, points plugs, wires, rotor cap.
This is were everything goes sideways. The car started and ran fine before project #2
I install everything( know I have been working on engines of all types most of my life ).I start it but it's popping through the carb and exhaust and idling very fast, never touched the carburetor. Everyone tells me "crossed wires". I checked them and the firing order so many times I lost count. I put the old cap and rotor back in, check the order again. Result, same. I pull the left valve cover to verify TDC on #1 cylinder comp stroke. Static time it with the rotor facing towards the #1 cylinder , #1 plug wire to #1 on the cap from #1 plug. I try to start it and .......Ka Fricking Boooom. My ears are ringing and there is a hole in the left muffler. firing order"18436572".
Any Thoughts?
This is were everything goes sideways. The car started and ran fine before project #2
I install everything( know I have been working on engines of all types most of my life ).I start it but it's popping through the carb and exhaust and idling very fast, never touched the carburetor. Everyone tells me "crossed wires". I checked them and the firing order so many times I lost count. I put the old cap and rotor back in, check the order again. Result, same. I pull the left valve cover to verify TDC on #1 cylinder comp stroke. Static time it with the rotor facing towards the #1 cylinder , #1 plug wire to #1 on the cap from #1 plug. I try to start it and .......Ka Fricking Boooom. My ears are ringing and there is a hole in the left muffler. firing order"18436572".
Any Thoughts?
Last edited by patrick68; Jun 9, 2017 at 04:48 PM. Reason: typos
Thread Starter
Intermediate
Joined: Sep 2013
Posts: 37
Likes: 0
From: san jose california
I thought about that, but the engine only has 52,000 easy miles on it.
it is possible though. Thanks
I did have the distributor out to check the pin. When I am on the comp. stroke TDC both valves closed. the mark on the crank dampener is lined up with the "0" on the timing cover and the rotor points towards #1 cyl.
it is possible though. Thanks
I did have the distributor out to check the pin. When I am on the comp. stroke TDC both valves closed. the mark on the crank dampener is lined up with the "0" on the timing cover and the rotor points towards #1 cyl.
Thread Starter
Intermediate
Joined: Sep 2013
Posts: 37
Likes: 0
From: san jose california
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
This is just a wag, but your motor is firing with valves open. The stock damper are prone to breaking between the inner and outer ring. It causes the timing mark to slip
Grab the outer ring and tq on it. Your cure is to probably get a damper puller/installer and a new damper
Grab the outer ring and tq on it. Your cure is to probably get a damper puller/installer and a new damper
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Melting Slicks
Joined: May 2012
Posts: 2,192
Likes: 344
From: Allenton Wisconsin
I thought about that, but the engine only has 52,000 easy miles on it.
it is possible though. Thanks
I did have the distributor out to check the pin. When I am on the comp. stroke TDC both valves closed. the mark on the crank dampener is lined up with the "0" on the timing cover and the rotor points towards #1 cyl.
it is possible though. Thanks
I did have the distributor out to check the pin. When I am on the comp. stroke TDC both valves closed. the mark on the crank dampener is lined up with the "0" on the timing cover and the rotor points towards #1 cyl.
If you were attempting to use OEM radio shielding you are running the front plug wires between the block and motor mount, very easy to get the wires crossed. Use a ohm meter to make sure they are correct. T
Melting Slicks
Joined: Mar 2008
Posts: 2,989
Likes: 198
From: Meriden CT
I thought about that, but the engine only has 52,000 easy miles on it.
it is possible though. Thanks
I did have the distributor out to check the pin. When I am on the comp. stroke TDC both valves closed. the mark on the crank dampener is lined up with the "0" on the timing cover and the rotor points towards #1 cyl.
it is possible though. Thanks
I did have the distributor out to check the pin. When I am on the comp. stroke TDC both valves closed. the mark on the crank dampener is lined up with the "0" on the timing cover and the rotor points towards #1 cyl.
Safety Car
Joined: Oct 2007
Posts: 3,729
Likes: 267
From: Austin Texas
Corvette of the Year Winner 2017
2016 C3 of Year Finalist
Never trust old Rubber mounted Timing mark,
Degree the wheel for true 0 degree #1.
you will chase your but when 1 has slipped, and they do move.
Degree the wheel for true 0 degree #1.
you will chase your but when 1 has slipped, and they do move.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
When the plug wires are run through that shielding, it is difficult to know which wire is which. You need to use an ohmmeter to verify each individual wire; tag them with the associated plug number ON BOTH ENDS after you verify each wire. THEN hook them up as intended.
{You DO have the sequence of wire going the correct direction on the distributor, don't you?}
{You DO have the sequence of wire going the correct direction on the distributor, don't you?}
