U/SA help request
 

My wife's 302 Ford slowed .4 and 4 mph last weekend.
Have checked usual suspects.
NOTHING in oil filter
Very little in Trans pan. just a dusting of clutch material. Fluid bright red.
Sounds good Good oil pressures. Good fuel pressure. Running the same fuel as my Super Stocker
No miss. not a traction problem
It has Comp hydraulic lifters. I heard somewhere that these can bleed sometimes.
Kinda baffeled???

Re: U/SA help request
 

Mike check your plugs and ing system. I had something happen on my footbrake care recently. I would just slow down, sounded good, no skip etc. But discovered that the module in the dist was going bad (Pertronics). All the plugs were black, changed module and its all better. Hope you find it.

Robert

Re: U/SA help request
 

Hi Mike, not to overstate the obvious but what were the weather conditions like? Wind and weather changes affect "little cars" a whole bunch more than they will affect your SS car.

Re: U/SA help request
 

Mike

Convertor??

Compare you time slip 60ft times to a "good" pass. If it loses a couple of hundredths in the 60ft, it could very easily lose 4 hundredths in the 1/4.

Compare all you incremental times and see where it losing or if its all the way down the track.

Good Luck

RJ

Re: U/SA help request
 

Billy Weather was almost identical to good
pass All incrementals were off. DA 3075 to 3080
RJ it slowed 4 tenths not 4 hun.
Something is wrong, but not obvious.

Re: U/SA help request
 

If the engine seems good, I'd suspect convertor issues. You may have a seized up stator, won't affect your 60 ft but will affect it the rest of the way down the track.

Jim Mantle V/SA 6632

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Look to see where on track you lost the time.
I have been having problems with MSD Coils
a lot in last couple of years. It reflects more on back 1/2
numbers and particularly MPH. I would borrow another coil
to try. Also Electrical stuff and connections slow the car down and
I would go thru all related wiring.

Re: U/SA help request
 

Mike,

My car has pulled that on me. I thought I lost a cam, everything checked out fine with the engine and leak down. I could not find anything mechanically wrong, and pulled all of the grounds and cleaned them. And magically the car was back to normal. What I found out was a bad ground was the problem. The data logger never showed a voltage issue or fuel pressure issue. But 3 passes in a row it kept slowing down more, and did not sound any different, after resorting to everything but mechanical it had to be an electrical issue.

Good luck

Sean

Re: U/SA help request
 

My 302 2v Maverick slowed .4 when I installed the correct legal carb. instead of the 351W carb that we thought was correct. That said we did have a issue with failed camshaft lobes that did not have a audible miss just really laid down. Louis Jeffery

Re: U/SA help request
 

I don't believe it's a converter issue.I was standing right there.
It went 85 under on the first pass. BJ didn't quite get it fully on the two step and it kinda rolled out on that run..still went that fast.
Next run , it looked good leaving on the two step.Surprisingly it slowed down over 2 tenths.
The head wind was quite strong at times, early on.

1st round Saturday, I assume Mike discounted the second TT ,and dialed kinda off the 1st one.
After the red light ,it ran 4-5 tenths over the dial.
My comment was .."You ought to be able to find it now".

Mike..You remember I told you about my street bracket car?
I had replaced the stock HEI module and coil with a slightly used MSD 6 A and a used Blaster coil.
Last two outings, it's been about 5 tenths slower than in the beginning .
The car starts, runs and drives perfectly.
I'm going to change it all back as soon as I get a chance.

Re: U/SA help request
 

I don't discount that it could be ignition. It has a Digital seven with the MSD coil.
I am very meticulous when it comes to ignition wiring. The MSD has 8 ga wire directly to battery for power and the same to the block for primary ground. The MSD has no low voltage alarms recorded. will re check all of that. We are going out Friday and will swap boxes and coil.
I thought Mark was right and I would find a bunch in the filter or in the trans pan. But more subtle than that.

Re: U/SA help request
 

If its been sitting a while I would check the valve springs too. Might even have a broken one or two. something like that could happen between two runs. Most likely not the MSD or coil. Anything else change electrically? The digital boxes don't like any "electrical noise". Did you run a leak down or compression test?

Re: U/SA help request
 

Years ago we had a fuel pump go bad. Had pressure but no volume. Or a plugged fuel filter. It caused us a major performance loss and didn't affect the running of the car. No engine miss or nothing. Changed pump problem cured.

Re: U/SA help request
 

[QUOTE=Bob Gullett;463588]Years ago we had a fuel pump go bad. Had pressure but no volume. Or a plugged fuel filter. It caused us a major performance loss and didn't affect the running of the car. No engine miss or nothing.

I lost a class race a few years ago to Bob because of a fuel pump failure in a "U" car. fuel pump just failed to keep up because of lack of volume.

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Spent about 1200.00 to find it was the pump. Had gauge mounted in front of windshield and always stayed above 6 lbs. So I chased everything else until I changed pump as someone suggested to do and shazam.

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That's the only way I can beat that U car! LOL

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You said you ran 8 gauge wire from ign box to power source but ground to the block,I had 2 different boxes in 2 separate cars that gave problems until I grounded box directly to the battery.might be worth a shot......Victor

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a few season's ago our car slowed down 4 tenths from one race to the next. After going through all the usual stuff in the engine.trans and so on it turned out to be the rubber hose in the brake line at the rear end had collapsed and wouldn't release the brake pressure all the way. Changed the hose and car picked right back up. Might be something to look at.

Re: U/SA help request
 

Mike

That sounds weird that you could lose 4 tenths and only slow down 4 mph. How did the short times compare to the first run??

Like Bill B said check your rubber brake hoses, I've had some that would collapse and hold pressure.

Keep us posted on what you find.

Good Luck

RJ

Re: U/SA help request
 

The rest of the story. I steal the datalogger out of the SS car and we head to Wildhorse
Pass. When the car leaves the fuel pressure drops to zero and never recovers the rest
of the run. Enough fuel that the car doesn't miss.
The idea of let's not over spend on the fuel system didn't work out. I would have never thought that a 110 gph pump would not be enough for a 225 hp stocker.
So on goes the 400 gph spare for my car. Problem solved. Right back to where the et should be and the car is now consistent.
As a side note. The pro bracket cutoff here is 13.99 and here car won't run that in the heat. So I prep a 1.21 carb thinking that it will pick the car up enough to run 13.99 during the day. That carb picked the car up 6 tenths and almost 6 mph. 13.42 at 98 mph on the first pass.

Re: U/SA help request
 

Uh-oh, do you mind if I ask if that was a new 110gph pump ? My combo uses a 1.21 carb on a 351c but my Carter pump is rated lower. :o

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Dave
It was new and it was Carter.

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Mike now your scaring me. I was hoping 13.90 would be enough in my Olds wagon. Good job.

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No worries Jeff. 1.21 not legal for this combination.

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Well, get to work then...I'll book you guys in for a match race in the Fall.

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Distributor roll pin worn and moving timing around on you?

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Just a thought, I have seen the insides of braided line go bad restricting flow, so a stronger pump may be making up for that.

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pretty sure summers can fill you in on that 6 tenths difference in the carbs :)

captain jack

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Couldn't prove it by me! He had me covered by .8 last weekend and I doubt he'll go any slower this weekend!