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Carburetor help
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jag327
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Joined: 04 Jun 2009
Posts: 83
Location: PG County MD
3218.32 points


1982 Chevrolet Camaro

PostPosted: Wed May 26, 2010 8:34 pm    Post subject: Carburetor help Reply with quote

Let me come to the guy's who no. I have 735 dp holley carb on 327 small block. Problem I having - when I rev the motor up to let say 7000 rpm when the tech drops from 7000 to 3600 rpm it go's down fast but after that it holds a little and drops down slowly to idle.

The carb runs the motor very good pass 3200 rpm hold on that when
power really kicks in.

I had this carb work on 3 times by the same company I bought it from.
Still the some problem. "O" I paid them 3 times to work on it to.

Any help out there... I'm back
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squeeezer
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Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Wed May 26, 2010 9:14 pm    Post subject: Reply with quote

lean condition?????

take it circuit by circuit and only change 1 thing at a time

1.idle circuit (do start with floats ie level)
2. power enrichment
a)power valve
b)accelerator pump(s)
3.metering

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jag327
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Joined: 04 Jun 2009
Posts: 83
Location: PG County MD
3218.32 points


1982 Chevrolet Camaro

PostPosted: Wed May 26, 2010 9:43 pm    Post subject: Reply with quote

squeeezer wrote:
lean condition?????

take it circuit by circuit and only change 1 thing at a time

1.idle circuit (do start with floats ie level)
2. power enrichment
a)power valve
b)accelerator pump(s)
3.metering



Can you break it down this went way over my head.
I'm try to do this my self. I need help under standing what idle circuit, power
enrichment, so on. Man the last time a pull a Holley carb apart was back in the 70s man I forgot this stuff. I all ways a had shop doing it. Work is slow no so I have to learn to do it now.

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10sec.et
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Joined: 29 Mar 2006
Posts: 3483
Location: Houston,Texas
347040.52 points


1969 Oldsmobile Cutlass

PostPosted: Thu May 27, 2010 1:00 am    Post subject: Reply with quote

i usually need "hands on" to diagnose carb problems but ill give it a try......... try disconnecting the secondary link and rev the engine with just the primaries (front two barrels) and see if it comes back to idle any better.
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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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jag327
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Joined: 04 Jun 2009
Posts: 83
Location: PG County MD
3218.32 points


1982 Chevrolet Camaro

PostPosted: Sat May 29, 2010 8:50 am    Post subject: Reply with quote

10sec.et wrote:
i usually need "hands on" to diagnose carb problems but ill give it a try......... try disconnecting the secondary link and rev the engine with just the primaries (front two barrels) and see if it comes back to idle any better.


I will try it Sunday morning. Also do you no of any good books and video's on holley carb tuning.

O the shop that I bought this carb from saying the way it is my motor
makes best power. Funny they just can't fix thing right.

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MufflerBearings69
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1968 Ford Galaxy

PostPosted: Sun May 30, 2010 12:24 am    Post subject: Reply with quote

Any Holley book by Alex Walordy is a good read. Might look like an expensive magazine but they are solid with info. Maybe someone else knows of some other books too...
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jag327
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Joined: 04 Jun 2009
Posts: 83
Location: PG County MD
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1982 Chevrolet Camaro

PostPosted: Sun May 30, 2010 4:44 am    Post subject: Reply with quote

MufflerBearings69 wrote:
Any Holley book by Alex Walordy is a good read. Might look like an expensive magazine but they are solid with info. Maybe someone else knows of some other books too...


Is this the book your talking about

http://static.summitracing.com/global/images/prod/large/hly-36-254.jpg

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MufflerBearings69
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1968 Ford Galaxy

PostPosted: Sun May 30, 2010 11:40 am    Post subject: Reply with quote

I have Super Tuning Holley Carburetors, but I dont see it listed anywhere. Maybe its out of print.

I have never laid eyes on the book in the link but would expect it cant hurt... Maybe someone else on here has that one to give an opinion.

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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Sun May 30, 2010 2:32 pm    Post subject: Reply with quote

we should make this a sticky http://www.smokemup.com/bb/viewtopic.php?t=1841&highlight=books

try searching for these on www.amazon.com

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It seems we can look at our magical Balls and come up with a fix?

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jag327
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Joined: 04 Jun 2009
Posts: 83
Location: PG County MD
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1982 Chevrolet Camaro

PostPosted: Mon May 31, 2010 12:46 pm    Post subject: Reply with quote

Man I was trying to see if the company I got it from would just replace
it but that's not going to happen. I have 750 dominator that works find on the motor. The 735 holley I bought last year thinking it would cut back on gas some but still give me good power for the street.

I was told to use edelbrock 750 avs carb man these are cheap in pricing what do you guy's think about there carbs.

But still looking into getting the 735 working on the motor.

[img[/img]

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Last edited by jag327 on Tue Jun 01, 2010 5:46 am; edited 1 time in total
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MufflerBearings69
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1968 Ford Galaxy

PostPosted: Tue Jun 01, 2010 5:14 am    Post subject: Reply with quote

Well, maybe it's an amateur approach and wrong but I am going to throw in my 2 cents-

I would verify all the holley bits are set to box stock specs and bolt it on and work from there... That's what I did with my carb to establish a solid baseline- and make 1 change at a time, and write down your changes. Then you can know what is good and bad, right and wrong, and systematically set it all up pretty close and fine tune it from there...

If it runs good with one carb and poorly with the other sounds like its in the carb...

My 2 cents though I am far from the most knowing here.

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jag327
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Location: PG County MD
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1982 Chevrolet Camaro

PostPosted: Tue Jun 01, 2010 5:25 am    Post subject: Reply with quote

I pull the carb apart it looks like I may have 3310 780 cfm holley.
Primary power valve 6.5 E, Pri 73 jets
Secondary metering block no power valve, jets are 84.

My idle vacuum is 5.5 I thought the power valve would be a smaller size is the carb set up wrong. And the rear metering jets should be smaller to.

Also do the rear accelerator pump should have a very small gap. It's set up to have pressure on the leg of the pump booster - is this the right way it's set up.








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MufflerBearings69
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1968 Ford Galaxy

PostPosted: Tue Jun 01, 2010 4:04 pm    Post subject: Reply with quote

Power valve sizing is definitely a factor here- 6.5 PV and 5.5 idle vacuum would mean its open at idle... First piece to adress.
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jag327
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Location: PG County MD
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1982 Chevrolet Camaro

PostPosted: Tue Jun 01, 2010 4:50 pm    Post subject: Reply with quote

MufflerBearings69 wrote:
Power valve sizing is definitely a factor here- 6.5 PV and 5.5 idle vacuum would mean its open at idle... First piece to adress.


From the looks of it Man I think they charge me 3 time and did not work on it. You think the metering blocks would be clean on the inside.

So the power valve should I change to 2.5, 3.5, 4.5,

Do the pumper rods front and back - should they have pressured set on them at idle like in the picture where the pen is in the picture or should be there like a small gap there.

Man thinks I wish, I came here at fist the 3 times they work on it - charge me total $335.00 I just don't see any work on this carb.

I pick up the books I could find, Chevrolet small block - parts interchange, holley carburetors by Dave Emanuel this book I could not some of the info I was looking for. Hot Rods Horse Power Hand Book this help me though, Chevy Performance 1955-1996 this help some to.

I called holley the guy I talk to told me if can call back in the morning. I sent them pictures, he side thats not a 700 mods to 735 cfm thats a 780 cfm was made for the chevy camaro 396 motor if any work was dun flow to maybe 830 cfm with mods.

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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Tue Jun 01, 2010 10:09 pm    Post subject: Reply with quote

Idle is at 5.5?

This whole thread has taken a crap!!!

It started as a secondary problem revving at 3000 when butterflies are closed?

WTH!!!!!!!!!!!! Rolling Eyes
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