Where did my power go?

Old 07-06-2008, 08:28 PM
  #1  
GotSomeRust
Junior Member
APPRENTICE
Thread Starter
 
Join Date: Jun 2008
Posts: 15
Default Where did my power go?

I went to the drag strip this weekend. My car ran 11.2s two weeks ago. This weekend it was running high 11.6s to low 11.7s. The only thing I did to the car between trips to the track was change the oil, charge the battery, & adjusted the tranny brake. I'll confess that I pulled a bonehead move and tried to start the car with the carb cap still on. I only did it once. The car runs OK, it's not right. Why did I lose 4.5 tenths? Car info and things I've tried are below. The only other thing, is that 2 weeks ago I was getting a puff of smoke sometimes when lifting off the gas at the end of the quarter (exhaust guides maybe going bad).

Car info:
1983 Cutlass
Chevy 350
Proline Heads
Victor Jr Intake
Holley 750
MSD 6-AL with external 2-step
MSD Blaster 2 coil
2-spd powerglide with tranny brake
Ford 9 inch rear with 513's
30x9x15 slicks

Things I've tried:
reset the valves
adjust the timing
swapped distributors
swapped 750 carbs
replaced 3 spark plugs that looked a wet
verfieid battery voltage.
This week I'm going to try changing all the plugs and putting a new set of plug wires on the car.

Help?!?! What else should I try. Where'd my power go?

Thanks
GotSomeRust is offline  
Old 07-06-2008, 09:09 PM
  #2  
jmarksdragster
Senior Member
RACING JUNKIE
 
jmarksdragster's Avatar
 
Join Date: Jul 2007
Location: Florida
Posts: 635
Default

Oil change ond plugs.
jmarksdragster is offline  
Old 07-06-2008, 11:40 PM
  #3  
Tod74
Senior Member
RACING JUNKIE
 
Join Date: Sep 2007
Posts: 4,143
Default

WHEN YOU RESET THE VALVES WAS THE LASH STILL WHERE YOU SET IT?I had this happen once and blamed it on the weather and everything else...but it got slower every pass up until a lifter broke and destroyed the engine. Looking back I think it got hurt the week before and it was telling me there was a problem (slowing down) and I ignored it...payed for it too. If any of them were loose I would look at the lifters if it is a solid roller.
Tod74 is offline  
Old 07-07-2008, 05:03 AM
  #4  
GotSomeRust
Junior Member
APPRENTICE
Thread Starter
 
Join Date: Jun 2008
Posts: 15
Default

Originally Posted by Tod74
WHEN YOU RESET THE VALVES WAS THE LASH STILL WHERE YOU SET IT?I had this happen once and blamed it on the weather and everything else...but it got slower every pass up until a lifter broke and destroyed the engine. Looking back I think it got hurt the week before and it was telling me there was a problem (slowing down) and I ignored it...payed for it too. If any of them were loose I would look at the lifters if it is a solid roller.
Yeah, lash was still OK. I'm running a solid roller. Only a few were slightly off from where I'd set them last time. Nothing to fire off any alarms...
GotSomeRust is offline  
Old 07-07-2008, 05:10 AM
  #5  
Tod74
Senior Member
RACING JUNKIE
 
Join Date: Sep 2007
Posts: 4,143
Default

I Wonder if the converter is about to take a dump?
Tod74 is offline  
Old 07-07-2008, 02:36 PM
  #6  
GotSomeRust
Junior Member
APPRENTICE
Thread Starter
 
Join Date: Jun 2008
Posts: 15
Default

Originally Posted by Tod74
I Wonder if the converter is about to take a dump?
Guess it's definitely a possibility...
GotSomeRust is offline  
Old 07-07-2008, 09:08 PM
  #7  
cepx111
Senior Member
RACING JUNKIE
 
Join Date: May 2006
Posts: 2,044
Default

I definetley change "ALL" the plugs out.
If you had some that were wet from the cap being left on the carb its a strong possiblity that the others arent in the best of shape, change them out and go back with your original set-up, I.E< carb, dist, timing etc.

Goodluck, Charles
cepx111 is offline  
Old 07-11-2008, 12:43 AM
  #8  
jrthone
Senior Member
SENIOR BUILDER
 
Join Date: Oct 2005
Location: Wellington , New Zealand
Posts: 122
Default

Temprature??????????????
jrthone is offline  
Old 08-04-2008, 07:28 PM
  #9  
promodjohn
Junior Member
APPRENTICE
 
Join Date: Oct 2007
Posts: 21
Default

I am wondering if you created a leak in the intake manifold or the carb. gasket when you tried to start it with the carb. cap on.

An easy way to check this is an old backyard method take a can of shaving cream,start the car and put a small amount around the carb.gasket and intake manifold gasket pay close attention if you see the shaving cream dissapear somewhere, you have a leak.

P.S. don't feel bad I did the same thing several years ago good luck.
promodjohn is offline  
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service