Tuning issues

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Tuning issues

Post  torkair on December 21st 2013, 7:26 pm

I've got my 460 all put back together and in the car but I am having issues getting it to run right. Right now I am having trouble with it blowing back through the carb, the power valve has blow back protection so it shouldn't have popped the diaphragm but I am pretty sure my timing is way off. Any help would be greatly appreciated!
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Re: Tuning issues

Post  J.Toney on December 21st 2013, 7:42 pm

Where's the timing set?
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Re: Tuning issues

Post  69F100 on December 21st 2013, 9:58 pm

[quote="torkair"]I've got my 460 all put back together and in the car but I am having issues getting it to run right.  Right now I am having trouble with it blowing back through the carb, the power valve has blow back protection so it shouldn't have popped the diaphragm but I am pretty sure my timing is way off.  Any help would be greatly appreciated![/quot

Have you had it running any if not you may have the dizzy 180° out it will make pop back thro the carb
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Re: Tuning issues

Post  torkair on December 22nd 2013, 8:56 pm

I checked timing and it is timed rather strangely, the pointer is right on the BTC mark on the balancer so either the outer ring has slipped or I have the timing WAAAY off but it is still somehow able to run. I have also found that the carb adjustments that worked on the old 400 are nowhere near sufficient for the 460 so I am going to be fighting with that for a while as well.
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Re: Tuning issues

Post  kim on December 22nd 2013, 9:19 pm

If your using the same carb from the 400 on the 460. That thing is going to require a whole lot less everything. More throttle plate opening for idle, way less idle mixture screws, and way less jet surface area.

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Re: Tuning issues

Post  J.Toney on December 22nd 2013, 10:34 pm

Before any cab mod can make a bit of difference, the timing at least needs to be ballpark.
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Re: Tuning issues

Post  460bronco on December 23rd 2013, 8:08 am

Have you verified if the balancer ring has slipped yet or not?
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Re: Tuning issues

Post  maverick on December 23rd 2013, 8:37 am

Correct timing pointer? I usually use a piston stop to verify zero.
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Re: Tuning issues

Post  bbf-falcon on December 23rd 2013, 1:24 pm

J.Toney wrote:Before any cab mod can make a bit of difference, the timing at least needs to be ballpark.

X2,forget about the Carb tuning until the timing is right.

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Re: Tuning issues

Post  aquartlow on December 23rd 2013, 3:04 pm

bbf-falcon wrote:
J.Toney wrote:Before any cab mod can make a bit of difference, the timing at least needs to be ballpark.

X2,forget about the Carb tuning until the timing is right.

X2^^^^. Once you get the ignition/timing figured out.... here is a good read with good directions on tuning Holley carbs.
http://members.tccoa.com/392bird/tuning.htm
Good luck. Todd
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Re: Tuning issues

Post  torkair on December 23rd 2013, 7:29 pm

Took the balancer off and compared it to another one that I have and the marks are in the exact same place.  Any tips regarding setting timing by vacuum?  It seems to like the base timing to be right around where the D9TE casting numbers are on the balancer, my other balancer is a D0oE piece.

Edit: Also noticed that I'd neglected to set the locks on a couple rockers, got that sorted out and it seems to be running much better now
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Re: Tuning issues

Post  supervel45 on December 23rd 2013, 7:58 pm

maverick wrote:Correct timing pointer?  I usually use a piston stop to verify zero.
This ^^^^^^^ And install a timining tape or correct your timimg pointer.

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Re: Tuning issues

Post  torkair on December 24th 2013, 12:20 pm

Is there a way to install the timing tape so that is stays on the balancer for a long time?
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Re: Tuning issues

Post  maverick on December 24th 2013, 12:29 pm

Make sure it's really clean (Brakleen), no oil residue. You can cover it with a durable clear tape, too.
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Re: Tuning issues

Post  Dave C. on December 24th 2013, 1:31 pm

The wifes' clear nail polish works well also.

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Re: Tuning issues

Post  torkair on December 31st 2013, 6:29 pm

I've found that it helps quite a bit to have the firing order set in the correct direction (bone head move on my part, amazing it ran at all). Anyhow, I have it set at 15* base timing at about 900 rpm in park. Definitely running too rich so I am gonna bump the air bleeds up 2 sizes and see where that sets the idle mixture, once the car port has aired out a bit of course, lol.
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