Login    Forum    Search    FAQ

Board index » Racing Forum » General Topics




Post new topic Reply to topic  [ 20 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: 78 camaro woes
 Post Posted: Sat Apr 21, 2012 6:24 am 
Offline
User avatar

Joined: Tue Nov 29, 2011 4:44 pm
Posts: 92
been a tough year so far with our car. gonna have to miss an event today, as i can not for the life of me figure out what is going on with car.

we went tnt last night for todays event. made 4 passes but to avail, has been acting the same for the past three weeks.

car is struggling to get down track, starts breaking up around the 330 mark.

most of the issues have been ignition related. the "burnout" side of my launch control is engaging down track. confirmed that last night trying 3 different chips.
recently replaced the pickup on the crank trigger about a month ago. so last night decided to bypass crank trigger and trigger from dizzy.

this time the car made it to 660 marker, then started to break up. when i mean break, it is every so slighty, just enough for me to abort run.

i have checked all the obvious things, plugs, tested wires, cap, rotor, timing, valve lash. compression.

gonna to see if i can run down another ignition box and dizzy today, as we have a race tomorrow i would like to race.

if have anybody can look into their magic ball, and spread some wisdom.


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sat Apr 21, 2012 7:03 am 
Offline
User avatar

Joined: Wed Apr 19, 2006 8:20 pm
Posts: 5852
Location: N.J.
What box?? Are you sure it's not gas related????
What's your fuel pressure going down track??

_________________
Image
running E85
Best ET 8.07
Best MPH 170.71
Barry


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sat Apr 21, 2012 8:08 am 
Offline
User avatar

Joined: Wed Oct 24, 2007 6:36 pm
Posts: 718
Location: Blanco, Texas
Have you checked your valve springs? Easy to check and rule out, and 1 broken valve spring will act like that. Ask me how I know! =;

_________________
Donee


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sat Apr 21, 2012 9:22 am 
Offline
User avatar

Joined: Tue Nov 29, 2011 4:44 pm
Posts: 92
using a msd 6al. gone thru entire fuel system from tank all way to carb.

a few weeks ago i thought was a fuel issue, tried increasing fuel pressure, jetted carb, adjusted float levels.
ended up being my crank trigger pick up(this time). was able to make three flawless passes when we used pick up on dizzy.

fuel pressure down track is at 7psi, stable entire run

fixing to pull valve covers off and check springs.


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sat Apr 21, 2012 10:07 am 
Offline

Joined: Tue Feb 05, 2008 6:45 pm
Posts: 248
I know that every time I hear these symptoms I start crying proper grounding,...but it does happen. Something else I've seen is the pick up wires to the box being wired in backwards. Easiest way to tell is while I'm stabbing the distributor for the first time.

Bring #1 cylinder up to TDC on the firing stroke. Point the rotor to the #1 tower on your distributor. (I usually point it to just before it.) Will usually be around 30°-35°,...if you have to turn the distributor about 90° to get it to fire then the pick up wires are probably reversed.

But make sure your battery ground goes to your block.

Don

_________________
GOODSON Tools & Supplies For Engine Builders


Last edited by want-a-be on Sun Apr 22, 2012 11:29 am, edited 1 time in total.

Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sat Apr 21, 2012 10:15 am 
Offline
User avatar

Joined: Wed Apr 19, 2006 4:11 pm
Posts: 2749
Location: Shepherdsville, KY
want-a-be wrote:
I know that every time I hear these symptoms I start crying proper grounding,...but it does happen.

Don


X2 Although I heard about it before I had to learn the hard way. Here's a link to thread from my troubles.
viewtopic.php?f=7&t=8316&start=0

_________________
Chuck Woloch

Chuck's Automotive
Full line Computech dealer
chucksautomotive@yahoo.com
Image


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sat Apr 21, 2012 10:19 am 
Offline
User avatar

Joined: Tue Nov 29, 2011 4:44 pm
Posts: 92
no broke springs, but valve stem tip on number 8 exhaust has a very noticeable wear pattern from roller rocker. can not check spring checker, as i do not have tool

yes, i read somewhere in the past on msd site that if the pickup wires were backwards it would create an advance on timing

i am pretty confident, i have it wire corrected, but i will check none the less

have a #2 wire from one head to other head then back to battery. have a #8 ground wire from battery to a terminal stud in cockpit, all electronics are grounded to this stud.


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sat Apr 21, 2012 3:54 pm 
Offline
User avatar

Joined: Tue Nov 29, 2011 4:44 pm
Posts: 92
borrowed a 6al and another dizzy, going to try the 6al first this coming wednesday night


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sun Apr 22, 2012 2:17 am 
Offline

Joined: Tue Feb 05, 2008 6:45 pm
Posts: 248
themadreefer wrote:

have a #2 wire from one head to other head then back to battery. have a #8 ground wire from battery to a terminal stud in cockpit, all electronics are grounded to this stud.

Paint under the ground terminal on the heads?....Sorry, had to ask.

Don

_________________
GOODSON Tools & Supplies For Engine Builders


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sun Apr 22, 2012 7:17 am 
Offline
User avatar

Joined: Tue Nov 29, 2011 4:44 pm
Posts: 92
no paint, i always sand/scuff metal. good point

off msd website

"If you’re not sure about the polarity of the pickup you are using, there is a simple test you can perform by checking the engine’s timing. Check the timing with the pickup wires connected one way, then swap the wires and check the timing again. You will notice that the timing changes significantly and may appear very erratic. The correct connection depends on the ignition control that is being used.Analog: If you are using an analog controlled MSD Ignition such as a 6A, 6T or 6AL series, SCI series, 7AL series, MSD 8 or 10 or Blaster Ignition, the correct connection is when the timing is retarded.Digital: When using an MSD Digital-6 or Digital-7 Plus, or the Programmable Digital-7 Ignition Controls, the correct connection is when the timing is more advanced."

so i decided to check both pickups , dizzy then crank trigger.

dizzy
green-purple
purple-orange
timing 39 degrees, vary stable
reversed wires
purple-purple
green-orange
timing 50 degrees, vary eradicate

crank trigger
green-green
purple-purple
timing 39 degrees, vary stable
reversed wires
purple-green
green-purple
timing 34 degrees, vary stable

it appears my crank trigger was wired backwards.
probably reason why i have had problems with my last two pickups.

of course i am using a 6al(analog) system.

food for thought.


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sun Apr 22, 2012 9:26 am 
Offline
Site Admin
User avatar

Joined: Tue Apr 18, 2006 6:38 am
Posts: 11804
Location: Coming At Ya!
themadreefer wrote:
off msd website

"If you’re not sure about the polarity of the pickup you are using, there is a simple test you can perform by checking the engine’s timing. Check the timing with the pickup wires connected one way, then swap the wires and check the timing again. You will notice that the timing changes significantly and may appear very erratic. The correct connection depends on the ignition control that is being used.Analog: If you are using an analog controlled MSD Ignition such as a 6A, 6T or 6AL series, SCI series, 7AL series, MSD 8 or 10 or Blaster Ignition, the correct connection is when the timing is retarded.Digital: When using an MSD Digital-6 or Digital-7 Plus, or the Programmable Digital-7 Ignition Controls, the correct connection is when the timing is more advanced."


Now that's good info as I was under the impression that they were all wired the same?? :-k Thanks

_________________
Big Boyz Toyz!

Image

Necessity is the plea for every infringement of human freedom. It is the argument of tyrants; it is the creed of slaves.

William Pitt, British Prime-Minister (1759-1806)


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sun Apr 22, 2012 4:21 pm 
Offline
User avatar

Joined: Sat Feb 07, 2009 4:12 pm
Posts: 1215
Location: Adelaide Australia
Thats why we use points. [-(


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sun Apr 22, 2012 7:03 pm 
Offline
User avatar

Joined: Tue Nov 29, 2011 4:44 pm
Posts: 92
shrinker wrote:
Thats why we use points. [-(


not that i am old or something, boy i sure miss them things, along with the dwell meter 8-[ 8-[


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Sun Apr 22, 2012 7:39 pm 
Offline
User avatar

Joined: Sat Feb 07, 2009 4:12 pm
Posts: 1215
Location: Adelaide Australia
Yeah stuff was simple back then. You just cleaned the carby in a bucket and off you went again. try doing that with EFI.


Top 
 Profile  
 
 Post subject: Re: 78 camaro woes
 Post Posted: Thu Apr 26, 2012 5:15 am 
Offline
User avatar

Joined: Tue Nov 29, 2011 4:44 pm
Posts: 92
went racing last night, and boy was it a good night.
the only change i made between races, was reverse the leads on crank trigger pick up.
car ran fricking great last night \:D/ \:D/ \:D/
actually set my new low et being 9.8 at 136

was cutting good lights all night long, except for first round eliminations, in which i decided to take a nap on line.

well anyway all appears good. cant wait till next wednesday.
thanks


Top 
 Profile  
 
Display posts from previous:  Sort by  
 
Post new topic Reply to topic  [ 20 posts ]  Go to page 1, 2  Next

Board index » Racing Forum » General Topics


Who is online

Users browsing this forum: No registered users and 2 guests

 
 

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to: