Poor acceleration - Team Camaro Tech
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post #1 of 33 (permalink) Old Dec 5th, 11, 08:08 AM Thread Starter
Tommy
 
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Location: Santa Rosa California
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Poor acceleration

any ideas. my 68 camaro with a 350/350 is sluggish and hestitates when i accelerate?
i replaced the plugs, the cap the rotor. The carbuator, the distrubutor and it adjusted the timing, the Air/fuel and the fuel filter but it has not changed the the sluggish and hestations...what am i missing?

Some mentioned the torque converter??

thanks for any help.

Tommy
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post #2 of 33 (permalink) Old Dec 5th, 11, 08:52 AM
r_w
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Robert
 
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Re: Poor acceleration

What type of carb?

I was fighting the same stuff, you can see it in this thread:

https://www.camaros.net/forums/showthread.php?t=200717

May or may not be the same problems, but hopefully will help...

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post #3 of 33 (permalink) Old Dec 5th, 11, 08:57 AM
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Re: Poor acceleration

Test the vac advance can by sucking on the hose with the engine off(or running, your choice). The can should hold vacuum applied to it.

'67 rs - ordered new by my Grandfather
327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

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post #4 of 33 (permalink) Old Dec 5th, 11, 09:19 AM
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Re: Poor acceleration

You need to provide more info! What is your timing set at? initial and total? What carb? Are you getting a good squirt from the accl pump? What dist? If you just installed an HEI and didn't remove the resistance wire that will cause it to be sluggish!

...Dennis

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post #5 of 33 (permalink) Old Dec 5th, 11, 09:20 AM Thread Starter
Tommy
 
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Re: Poor acceleration

i just put a 600 edelbrock on it.
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post #6 of 33 (permalink) Old Dec 5th, 11, 09:22 AM Thread Starter
Tommy
 
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Re: Poor acceleration

timing is set a 32 degrees. it does have a mild cam in it. the distrub. is a stock points, no HEI at this point, but that was next. carb is a 600 edelbrock.
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post #7 of 33 (permalink) Old Dec 5th, 11, 09:43 AM
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Re: Poor acceleration

32 degs total is a bit low for a 350, you should be able to run 36degs total and that should really wake up things. Always be aware and watch for pinging and detonation. When setting the total timing do it in 2 deg changes and test drive the car under a load like up a big hill at low rpm and give it some gas!

As for the hesitation it's likely the pump is not providing enough squirt when the throttle is opened and all that air rushes into the carb. Try moving the pump drive link to one of the holes closer to the carburetor body. This will increase the stroke length of the plunger and result in more pump delivery.

Here's a good bit on tuning your carb...

http://www.edelbrock.com/automotive_...ers_manual.pdf

...Dennis

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post #8 of 33 (permalink) Old Dec 5th, 11, 09:44 AM
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Re: Poor acceleration

Vacuum reading at idle?
You might try using full vacuum on vac adv to increase vacuum, you may have to retard dist alittle, to make engine run smoother.
Typically, you might have to dial in 8-14 of initial timing with full time vacuum.
Read JohnZ's sticky on Timing 101 in Performance.

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post #9 of 33 (permalink) Old Dec 5th, 11, 09:49 AM Thread Starter
Tommy
 
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Re: Poor acceleration

thanks guys i will try you tips when i get home. Oh i also noticed when i drove this moring down the freeway it felt like it had a governer on it ?? cruzing it along i could feel the car wanted to go faster but it was like it was not letting it. ??
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post #10 of 33 (permalink) Old Dec 5th, 11, 10:52 AM
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Re: Poor acceleration

Bad fuel pump?

1969 SS Garnet Red X55 350 Factory 4 speed
12 Bolt 3.55 Posi
461 BBC TKO600
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post #11 of 33 (permalink) Old Dec 5th, 11, 11:00 AM
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Re: Poor acceleration

You mentioned that you just put an Edelbrock 600 on.Did you check to make sure that the choke is opening fully when the motor is at operating temperature?

1969 SS Garnet Red X55 350 Factory 4 speed
12 Bolt 3.55 Posi
461 BBC TKO600
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post #12 of 33 (permalink) Old Dec 5th, 11, 11:27 AM Thread Starter
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Re: Poor acceleration

yes i believe so. but how do i make sure?
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post #13 of 33 (permalink) Old Dec 5th, 11, 12:19 PM
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Re: Poor acceleration

It sounds classic retarded timing...Do as Dennis says increase total ( intial+cent) in 2 deg increments..there will be a piont around 34 /36 degs it will comwe alive...once it has dont go anyfurther...
Quote:
is a stock points,
you mentioned changing cap etc..did u vheck adjust pionts? and if so did u do it will feeler gauges or dwell...do it with a dwell while running using the window and allen key and set to 32 ....Note this is the pionts gap not the timing...which is done at the harmonic balancer......spot the timiing with a timing gun, take the rpms up to just over the piont where the mark no longer moves...then adjust the timing from 32 to 34/35.
Since u have checked this already...I assume that u do have the harmonic balance timing marks extended out?????

My Spelling is not incorrect...it is creative

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post #14 of 33 (permalink) Old Dec 5th, 11, 12:56 PM Thread Starter
Tommy
 
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Re: Poor acceleration

i gap the points a 1600, rpms is about 1100
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post #15 of 33 (permalink) Old Dec 5th, 11, 03:45 PM
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Re: Poor acceleration

Quote:
i gap the points a 1600, rpms is about 1100
With the dwell meter? and what is that set at 32 degs?
I get the feeling u are mixing up the dwell degs and the timing degres at the crank.....

both very different measurements....not to be confused ....
almost.. change the dwell and the timing will change, alway re set timing after a points reset .

My Spelling is not incorrect...it is creative

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