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06-22-2012, 06:04 PM
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CC Member
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Join Date: Jul 2010
Cobra Make, Engine:
Posts: 33
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Timing the motor
Hi everyone, ben a while since I poasted. My question is timing.
I have a 428 with the March Performance serpintine kit and the pulley goes over the balancer which has the timing marks on it. Ho do you time the motor? Thank you,
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06-23-2012, 07:45 AM
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CC Member
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Join Date: Feb 2002
Location: Dadeville,
AL
Cobra Make, Engine: Sold my EM.
Posts: 2,459
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As no one else is rushing in to answer your question, I'll respond by asking for clarification. Are you asking how to time your engine without being able to see the timing marks, or are you asking how to put timing marks on the parts of your engine you can see now that the harmonic balancer is covered?
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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06-23-2012, 11:20 AM
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Join Date: Apr 2011
Posts: 1,092
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The timing can be done - you'll need two mirrors, a penlight and a way to affix all in a stable manner (or three brain surgeons with steady hands), then you can have at it!
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06-25-2012, 06:55 AM
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Join Date: Jul 2010
Cobra Make, Engine:
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Yes, the timing marks are covered by the new crank pulley.
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06-25-2012, 11:07 AM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,605
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Just do it by ear. It always checks out spot on when I do it by ear.
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06-25-2012, 11:46 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
KY
Cobra Make, Engine: I'm Cobra-less!
Posts: 9,417
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Quote:
Originally Posted by CHANMADD
Just do it by ear. It always checks out spot on when I do it by ear.
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Last guy that tried to time one of my engines by ear ended up at 64 degrees total mechanical advance.  I wouldn't recommend it for the inexperienced....  |
06-25-2012, 11:51 AM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,605
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Next time I,m in KY I,ll stop by.  |
06-25-2012, 01:54 PM
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Join Date: Apr 2011
Cobra Make, Engine:
Posts: 11
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Best to pull off valve Cover, find out tdc from spark plug hole and Redo the markings. They Might be wrong even when new
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06-25-2012, 02:00 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Use a small, hi-speed cutting wheel to cut a small window in the cover. It wouldn't have to be much, and no one would ever see it. You'd think there would already be one there.
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06-25-2012, 03:32 PM
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Join Date: Feb 2002
Location: Dadeville,
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Cobra Make, Engine: Sold my EM.
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There are all sorts of techniques for finding Top Dead Center on #1 cylinder. Use Google to find the one you like best. Once you have your engine at TDC on #1, you can put a temporary or permanent mark on the pulley that covers the balancer. You can put the mark anywhere you like as long as there is a corresponding stationary item nearby that you can use as a pointer. Or you can fabricate a pointer and put it wherever you like. Once you have TDC marked on your pulley, you can put additional marks for 10 degrees BTDC or whatever you like on the pulley. Just measure the total circumference of the pulley and divide that by 360 to find the distance per degree. For example, if the pulley were 36 inches in circumference, each tenth of an inch would be one degree. Assuming your pulley turns clockwise (when looking from in front of the car), a mark one inch clockwise around the circumference of the pulley from your TDC mark would be 10 degrees BTDC.
__________________
Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
Last edited by Tommy; 06-25-2012 at 03:56 PM..
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06-25-2012, 03:45 PM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
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Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
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Just a thought here..... Could your cam timing be off?  |
06-26-2012, 05:48 AM
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Join Date: Jun 2012
Location: Naracoorte,
SA
Cobra Make, Engine: CR Cobra 3169
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Another quick way, Take out number one plug, turn motor over by hand, until you feel compression, insert a long thin screwdriver down plug hole, and youl feel the piston come up. As it nears the top use 2 fingers to hold the screwdriver against the head with other hand make a pencil mark on the crank pulley.keep turning it over as the screwdriver comes up and back down, as your fingers bottom out on the head again, make another mark. between the two marks should be tdc. As you rock the engine, youll get a feel for it. That should be pretty close. "
JD
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06-26-2012, 06:23 AM
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CC Member
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Join Date: Dec 2001
Location: Louisville,
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True, it's a stupid design.
However, finding where true TDC is does nothing for you if you need to end up in the 30's and nothing is marked.
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07-29-2012, 08:07 PM
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Join Date: Jul 2011
Location: Shelby,
oh
Cobra Make, Engine: acc
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timing
What about using a vacuum gauge, I used one to set my idle mixure screws. then I read you can set your timing with one as well.
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07-30-2012, 03:20 AM
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Quote:
Originally Posted by daverascal
What about using a vacuum gauge, I used one to set my idle mixure screws. then I read you can set your timing with one as well.
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Yes it can be done, but also another crude way to get the engine running.
A pro uses the positive stop method via the spark plug hole to find true TDC, then mathematically marks the balancer from 10 - 50 degrees BTDC.
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Gary
Gold Certified Holden Technician
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07-30-2012, 07:18 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Quote:
Originally Posted by Gaz64
A pro uses the positive stop method via the spark plug hole to find true TDC, then mathematically marks the balancer from 10 - 50 degrees BTDC.
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Not just pros, even talented amateurs. And you don't have to rotate the engine backwards either. The whole process is a 15 minute job. Click here: How big an issue are slipping balancers? |
07-31-2012, 06:03 PM
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CC Member
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Join Date: Jul 2011
Location: Shelby,
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Cobra Make, Engine: acc
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Vac. gauge
I tried the vacuum gauge, don't do it way off!!! UGH Used a light much better.
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