slack in timing chain

cenok is family

15 Year Member

Jun 25, 2003

1,409

69

79

Norman, Ok

Jun 13, 2007

#1

• Jun 13, 2007

• #1

i just assembled my motor last night. most parts are either new or have been machined so everything went smoothly. when i put my timing chain on, i noticed there is a pretty good amount of slack in it. if i'm correct, there's supposed to be a little bit, right? i can grab the chain on either side between the sprockets and move it 1/4" to 1/2". does it sound like i need a new chain? thanks guys!

 

Busted07

I need my gorilla to be about an inch longer.

Nov 15, 2005

0

3

0

Jun 13, 2007

#2

• Jun 13, 2007

• #2

Did you buy the summit brand chain? The reason im asking is thats what i bought, and it had ALOT of slack in it. I think at most it was supposed to have 1/2" of deflection, and mine was right there.

I didnt want to start a new motor with a loose chain, so i bought the FRPP chain (45-50 bucks i think) and it fit perfectly.

I took a picture just in case anyone ever asked...

Here is the slack in the summit chain.



and...

how it should look..



I didnt get a picture with the FRPP piece on it because we slapped the timing cover on right after we installed it. but the frpp one looked tight like the bottom picture. In the instructions, it stated that you are supposed to turn the motor over, and that load will put a little tension on the chain, however, even with doing that, mine was loose as hell. I think if you have 1/2" of deflection right now, i would get another one. once your chain stretches even a little bit, it will be out of the maximum allowable limit

 

cenok is family

15 Year Member

Jun 25, 2003

1,409

69

79

Norman, Ok

Jun 13, 2007

#3

• Jun 13, 2007

• #3

yeah mine looks about like that top pic. i'm not sure which chain it is, it was on the motor before though. i'll get some pics up tonight. when i was rotating the motor to adjust my rockers, tension was put on one side of the chain and the other side was left with slack. i didn't like that at all. thanks for the heads up and info, i appreciate it. also, where did you get the frpp piece? i'll order if i have to but i'd rather get locally so i can get my motor together asap. also, i'm checking some out on ebay, summit, etc, and i've found ones that say .250" diameter and .200", which one would i need or does it matter? thanks again!

 

Busted07

I need my gorilla to be about an inch longer.

Nov 15, 2005

0

3

0

Jun 13, 2007

#4

• Jun 13, 2007

• #4

cenok is family said:

yeah mine looks about like that top pic. i'm not sure which chain it is, it was on the motor before though. i'll get some pics up tonight. when i was rotating the motor to adjust my rockers, tension was put on one side of the chain and the other side was left with slack. i didn't like that at all. thanks for the heads up and info, i appreciate it. also, where did you get the frpp piece? i'll order if i have to but i'd rather get locally so i can get my motor together asap. also, i'm checking some out on ebay, summit, etc, and i've found ones that say .250" diameter and .200", which one would i need or does it matter? thanks again!

Click to expand...

No problem man ! I believe that when you rotate the motor, one side of the chain is supposed to be tighter than the other. They tell ya in the instructions to do that (get the tension on 1 side) then measure the defelction on the loose side.

This is the one i got... http://store.summitracing.com/partdetail.asp?part=FMS-M-6268-A302&autoview=sku

And for our cars, the only other one i see is the steel version here... http://store.summitracing.com/partdetail.asp?part=FMS-M-6268-B302&autoview=sku

and actually, i didnt see the steel one when i got mine, although i dont really know the difference besides maybe the steel one weighs a little less.

 

Modular2v

Founding Member

Jun 30, 2002

3,222

23

99

oklahoma

Jun 13, 2007

#5

• Jun 13, 2007

• #5

its suppose to have about a 1/4 inch worth of slack in it

 

Busted07

I need my gorilla to be about an inch longer.

Nov 15, 2005

0

3

0

Jun 13, 2007

#6

• Jun 13, 2007

• #6

Modular2v said:

its suppose to have about a 1/4 inch worth of slack in it

Click to expand...

Right, but if he starts off with a chain that already has the maximum allowable amount of slack, IMO, he should replace that thing asap

 

Modular2v

Founding Member

Jun 30, 2002

3,222

23

99

oklahoma

Jun 13, 2007

#7

• Jun 13, 2007

• #7

agreed

 

S

smr

Member

Nov 14, 2005

167

0

16

Nor*Cal (Vacaville)

Jun 14, 2007

#8

• Jun 14, 2007

• #8

if you have had the block align bored you may need to get undersized chain as well. ling boring can move the cam center to crank center distance a hair. I am running a .005 under chain.

 

cenok is family

15 Year Member

Jun 25, 2003

1,409

69

79

Norman, Ok

Jun 14, 2007

#9

• Jun 14, 2007

• #9

i went ahead and bought a new one. there's pretty much no slack in the new chain i got. i just went to oreilly's and got a cloyes "HO" one. seems to be a pretty good piece. thanks for all the help guys!

 

S

Sicarius428

Active Member

Jan 6, 2004

2,085

5

49

Jun 14, 2007

#10

• Jun 14, 2007

• #10

I got one of the summit brand ones and it had very little slack. Guess i got lucky.
Kevin