afr users, what happened?????

R

rculjak

Founding Member

Jan 29, 2001

190

0

0

May 16, 2004

#1

• May 16, 2004

• #1

Hey guys, I have come to the conclusion that I have bent my intake valves, I am running a stock bottom end with a stock cam, I installed afr 165's 1400series 61cc with a 7/16ths stud upgrade coupled with comp cams alluminum 1.7 rockers. I have no compression on most of my cylinders, what the hell happened, are the 1.7 rockers too big with the stock cam, the guys at afr told me I would have no problems, what are you guys running?

 

P

PRO50SC

New Member

Dec 28, 2003

1,012

1

0

Olney, Maryland

May 16, 2004

#2

• May 16, 2004

• #2

rculjak said:

Hey guys, I have come to the conclusion that I have bent my intake valves, I am running a stock bottom end with a stock cam, I installed afr 165's 1400series 61cc with a 7/16ths stud upgrade coupled with comp cams alluminum 1.7 rockers. I have no compression on most of my cylinders, what the hell happened, are the 1.7 rockers too big with the stock cam, the guys at afr told me I would have no problems, what are you guys running?

Click to expand...

Dude, that really sucks. Glad I was able to steer you in the right direction though. How did you come up with this combo and if it would work or not?

 

R

rculjak

Founding Member

Jan 29, 2001

190

0

0

May 16, 2004

#3

• May 16, 2004

• #3

well I wanted to use the stock cam and I thought it would fit without problems, since I have a blower I didnt want to make more than 450 at the wheels.

 

cardudeusa

Founding Member

Oct 22, 2002

1,744

5

48

Home of the Florida Gators!

May 16, 2004

#4

• May 16, 2004

• #4

I don't see how you could have bent the valves. What size valves did they come with?

 

R

rculjak

Founding Member

Jan 29, 2001

190

0

0

May 16, 2004

#5

• May 16, 2004

• #5

they came with 190 and 160's.

 

Badlilstang

Founding Member

Feb 21, 2001

1,606

0

37

Spring , Texas

May 16, 2004

#6

• May 16, 2004

• #6

Did you overtiten the rockers? Did you change to the correct pushrods? If the rockers are holding open the valves you wont have compression.

 

cardudeusa

Founding Member

Oct 22, 2002

1,744

5

48

Home of the Florida Gators!

May 16, 2004

#7

• May 16, 2004

• #7

What year is your car, not an 86 is it? My edlebrocks have the same size valves, I'm using stock cam and stock rockers for now and they have no problems. Maby you adjusted the rockers wrong???

 

Rick 91GT

Mustang Master

Nov 29, 1999

9,692

95

99

PA

May 16, 2004

#8

• May 16, 2004

• #8

Badlilstang said:

Did you overtiten the rockers? Did you change to the correct pushrods? If the rockers are holding open the valves you wont have compression.

Click to expand...

That's exactly where I'd start if the combo was just put together...

 

R

rculjak

Founding Member

Jan 29, 2001

190

0

0

May 16, 2004

#9

• May 16, 2004

• #9

Thanks for the info guys. I am using the stock length pushrods seeing as I am using the stock cam, its a 90, using 1.7 comp cam rockers, I have done pedistol rockers before, rotate the cam until both valves are closed(pushrods at lowest point) and find zero lash and I gave it half a turn and locked the polylocks, did I do something wrong? Maybe they are not the right pushrods, would I need longer ones? Not sure how to check that stuff just went with what people reccomended.

 

90mustangGT

I felt sorry for girls because

Founding Member

Jan 15, 2002

2,773

17

89

Dallas, GA

May 16, 2004

#10

• May 16, 2004

• #10

Oh that sucks, I can feel what your feeling. My first guess would have been the rockers hanging the valves open. Bent valves would have made a bad noise when your first tried to crank it. I just can't imagine what it could be. Did you do a compression test? If you have an air compressor, remove all spark plugs, close the intake at the TB and run air through one of the cylinders, if air comes out the other spark plug holes, that will be a sure indicator.

 

R

rculjak

Founding Member

Jan 29, 2001

190

0

0

May 16, 2004

#11

• May 16, 2004

• #11

you see, I didnt hear anything like valves bending, the car never ran it started up idled for like 20 seconds and then never started again, I wish I could figure out the proper way to set a valve train and size pushrods without towing the car to a proffesional.

 

Rick 91GT

Mustang Master

Nov 29, 1999

9,692

95

99

PA

May 16, 2004

#12

• May 16, 2004

• #12

http://www.turbomustangs.com/forums/attachment.php?s=&postid=189047

 

T

trendkilllx

New Member

Aug 28, 2003

79

0

0

Las Vegas

May 17, 2004

#13

• May 17, 2004

• #13

I have a 91 with stock short block and running stud mount afr 165's with 58cc chambers, along with tfs 1.7 RR's, and tfs stage 1 cam with no clearance problems. I cant see you have any clearance issues inless its an 86 or the valvetrain is not adjusted correctly.

 

R

rculjak

Founding Member

Jan 29, 2001

190

0

0

May 17, 2004

#14

• May 17, 2004

• #14

Thats what I thought, I shouldnt have clearence problems with the stock cam, mind you I have the 61cc head with the 1.7's, can you guys babystep me through setting the rockers and what to do after you are at zero lash, I went half a turn.

 

S

SmockDoiley

New Member

Jun 14, 2003

1,591

2

0

San Diego, CA

May 17, 2004

#15

• May 17, 2004

• #15

Do a quarter turn. 1/2 is too far. As far as pushrods. Though the length should be the same since only TrickFlows really require a different size, you shouldnt use stock since your RPMS are going to be higher and your pushrods are already used. Call AFR and verify that you can use stock length though. But it sounds like you overtightened the rockers and your valves are stuck open. I had the same issue when I did my heads, but after readjusting, it fired right up.

 

R

rculjak

Founding Member

Jan 29, 2001

190

0

0

May 17, 2004

#16

• May 17, 2004

• #16

I bought stock length but hardened from ford motorsport for use with valve guides. I called afr but they said you have to measure, I hope I didnt bend any valves, wouldnt I hear that because I didnt hear anything.

 

I

Idwitheld-1`

New Member

Nov 30, 2003

335

0

0

Portland Oregon

May 17, 2004

#17

• May 17, 2004

• #17

did you measure the original length push rod and then measure the new length push rod? Sometimes they accidenatlly pick the wrong part in inventory and....well you know.

I bet the valves are not closing.

 

89CopCoupe

Banned

Feb 17, 2004

606

0

0

Post Count City

May 17, 2004

#18

• May 17, 2004

• #18

Are the rockers over-tightened, and when the lifters pumped up the valves were left open?

 

R

rculjak

Founding Member

Jan 29, 2001

190

0

0

May 17, 2004

#19

• May 17, 2004

• #19

How do you prime the lifters and is this neccessary?

 

T

trendkilllx

New Member

Aug 28, 2003

79

0

0

Las Vegas

May 21, 2004

#20

• May 21, 2004

• #20

I don't believe you have to prime the lifters. Here's the way i Adjusted my rocker arms. I tigthend them down by hand (with lifters in the down position) until I saw the pushrods (stock lenght) start to go down, or preload the lifters. Then I turned them another 1/2 a turn, then locked them. Car runs great.