Author Topic: Something weird going on  (Read 46560 times)

Offline cudabob496

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Re: Something weird going on
« Reply #15 on: August 26, 2016 - 11:42:15 PM »
ok, the float level in the primary bowl was about 3/8 inch too low. I checked the level once I reassembled the carb,
and ran the engine for a couple minutes. Level is now at bottom of site glass. I set the level by turning bowl upside down,
and adjusting till top of float covered about 1/2 of the two visible brass screw heads.  Or, when the bottom of float
is about 1 inch from top of bowl (when looking at bowl turned upside down)

All eight accelerator diaphragm screws were a tad loose.  Of the six large
throttle plate brass hold down phillips head screws under the carb, 5 were
a tad loose (but still tight), and one at the back of the secondary bowl area was very loose,
(could move with hand).

Started car up. Runs better, but still rough, like a plug is fouled or something,
and I still don't think it will idle.

Adventure continues tomorrow. Trying to exhaust all possibilities before buying new
metering blocks.
« Last Edit: August 27, 2016 - 04:16:56 AM by cudabob496 »
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

2011 Kawasaki Z1000




Offline cudabob496

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Re: Something weird going on
« Reply #16 on: August 27, 2016 - 05:16:57 PM »
cwap, Summit only has metering blocks for 750's
will be calling Holley on Monday
Apparently the new metering blocks for my carb are structurally reinforced,
to prevent warpage, which was common on 15 yr old carbs.
Getting more temping to buy a whole new carb!!
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

2011 Kawasaki Z1000

Offline cudabob496

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72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

2011 Kawasaki Z1000

Offline Chryco Psycho

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Re: Something weird going on
« Reply #18 on: August 29, 2016 - 04:46:06 AM »
Yes they will

Challenger - You`ll wish You Hadn`t

Offline cudabob496

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Re: Something weird going on
« Reply #19 on: August 29, 2016 - 01:15:48 PM »

why no secondary power valve provision? Is a secondary power valve just not needed?

https://www.summitracing.com/parts/qft-34-105
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

2011 Kawasaki Z1000

Offline cudabob496

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Re: Something weird going on
« Reply #20 on: August 29, 2016 - 02:02:30 PM »
ok, talked with Holley, if  I go with no secondary power valve,
will have to jet up the secondary side 6 to 8 numbers.

Went ahead and ordered original Holley replacement metering blocks.
Will report if solves problem I am having.
« Last Edit: August 29, 2016 - 03:30:51 PM by cudabob496 »
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

2011 Kawasaki Z1000

Offline HP_Cuda

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Re: Something weird going on
« Reply #21 on: August 29, 2016 - 02:58:46 PM »

I have heard as much as 6 to 10 jet sizes large when blocking off the secondary power valve.

Heck some racers block both primary and secondary as they run larger jets for WOT all the time.

ok, talked with Holley, if  I go with no secondary power valve,
will have to jet up the secondary side 6 to 8 numbers.

Went ahead and ordered original Holley replacement metering blocks.
Will report is solves problem I am having.
1970 Cuda Clone 440 4 speed - sublime green
1970 Cuda 383 4 speed - yellow - SOLD

Offline cudabob496

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Re: Something weird going on
« Reply #22 on: August 29, 2016 - 05:54:55 PM »
makes sense to get rid of power valve if you can.  That eliminates another
part that can fail.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

2011 Kawasaki Z1000

Offline cudabob496

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Re: Something weird going on
« Reply #23 on: August 31, 2016 - 09:41:06 PM »
got the stock replacement for the secondary metering block today. It
has reinforced ribbing to prevent warpage, compared to the one I have.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

2011 Kawasaki Z1000

Offline cudabob496

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Re: Something weird going on
« Reply #24 on: September 07, 2016 - 09:08:29 PM »
new metering blocks in, and will run above 1200 rpm, but quits below that.
And very hard to start it up! cwap. Might just send whole carb into Holley
to let them figure it out.  Might also have to start checking different electrical
components.  ughh!
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

2011 Kawasaki Z1000

Offline Cudakiller70

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Re: Something weird going on
« Reply #25 on: September 07, 2016 - 10:21:46 PM »
Bob could it be bad gas?
Can you borrow a known good carb?
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The above is just my opinion
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Offline Cudakiller70

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Re: Something weird going on
« Reply #26 on: September 07, 2016 - 10:31:39 PM »
Have you looked inside your distributor at cap and rotor, advance springs broken, reluctor set?
Shaft wiggle?
Vacum leaks?
« Last Edit: September 07, 2016 - 10:34:05 PM by Cudakiller70 »
Auto spell I'm tired of your shirt
The above is just my opinion
Our Constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other.
John Adams

Offline cudabob496

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Re: Something weird going on
« Reply #27 on: September 07, 2016 - 11:04:24 PM »
ya, some good suggestions. wondering if its something of a mechanical nature,
since engine is 15 years old. Points and rotor looked good, but didn't look at springs,
will do that.

This has been coming on slowly over the last two months.  sure thought new metering blocks would
solve it.  Don't have a carb to borrow, but will look into that.

Bad gas? perhaps, but above about 1500 rpm runs strong.

Will keep brain storming (with whats left of my brain)
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

2011 Kawasaki Z1000

Offline cudabob496

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Re: Something weird going on
« Reply #28 on: September 08, 2016 - 01:43:48 AM »
well, pulled off distributor cap and rotor, and focused on the black camber shaped metal
weights, each of which have a spring attached to them. When I pull them apart, as they would
move on increasing rpms, they come back very sluggishly. And sometimes not all the way back.
Does that mean springs are weak, or does the assembly need a shot of WD-40?

Also, just found out the magnetic pickup is bad. Supposed to read 500 to 700 ohms, and is very low,
almost grounded. Time for a rebuild of the distributor guts.
« Last Edit: September 08, 2016 - 02:16:14 AM by cudabob496 »
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

2011 Kawasaki Z1000

Offline HP_Cuda

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Re: Something weird going on
« Reply #29 on: September 08, 2016 - 11:03:51 AM »

Replace those springs!!!

Should see some serious improvement.
1970 Cuda Clone 440 4 speed - sublime green
1970 Cuda 383 4 speed - yellow - SOLD