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Jim Mock Cams and chain / engine rattle? 

 

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Posted: Tue Sep 23, 2008 11:06 pm 
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check the filter in the tensioner

 

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Posted: Sun Sep 28, 2008 8:59 pm 
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filter is clean.

new guide kit, shimmed up new tensioner (3x1mm washers), brand new chain -- still got the noise. The new chain was about 1cm shorter than the old, and the old guides were pretty worn. i thought it was going to be perfect, but alas...

i am running jmm springs, i think i will try crow doubles perhaps. running out of options. hope it hasnt snapped the passenger side guide already, f**k if i have to go through that for a 4th time.
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Posted: Sun Sep 28, 2008 10:01 pm 
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1cm stretch...wow thats a lot!!!

 

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Posted: Sun Sep 28, 2008 11:13 pm 
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car had 270,000km on it. no other problems (until i fitted the jmm springs).
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Posted: Mon Sep 29, 2008 12:39 pm 
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JMM is f**k rubbish. I THINK they have a high lift short duration cam that causes harsh backlash.... f**k it off get and get a real cam...

http://www.camtechcams.com.au/cat/forde6.html

Ive ordered the CT830.

 

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ED Fairmont Barra 190rwkw 4.10 Gears 3500 Stall 1/4 to come

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Posted: Mon Sep 29, 2008 12:45 pm 
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I think its spring related. Im not using a JMM cam - I have a Wade 1521a - but im using JMM springs. The cam has 0.524' lift at the valve.

The specs of the springs I know of are:

CROW 7739 - 90lb
CROW 7738 - 110lb
CROW 7333 - 125lb (doubles)

Does anyone know how many pound the JMM springs are and what a minimum would be for a cam with that much lift? What are others with cams of similar lift running?
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Posted: Tue Sep 30, 2008 12:17 am 
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edfairmont4.0 wrote:
JMM is f**k rubbish. I THINK they have a high lift short duration cam that causes harsh backlash.... f**k it off get and get a real cam...

http://www.camtechcams.com.au/cat/forde6.html

Ive ordered the CT830.


carefull.... with a lower revving, relatively low comp engine you dont want too much duration. Mal and they boys @ Camtech are great, and dont get me wrong, they do have good grinds, but for a std rev range <10:1 comp 6cylinder, I wouldnt go much over 225* @ 0.050, & make up the rest of your AUC window with lift.

Just my 2c

 

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Posted: Tue Sep 30, 2008 3:00 pm 
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Jaysen wrote:
edfairmont4.0 wrote:
JMM is f**k rubbish. I THINK they have a high lift short duration cam that causes harsh backlash.... f**k it off get and get a real cam...

http://www.camtechcams.com.au/cat/forde6.html

Ive ordered the CT830.


carefull.... with a lower revving, relatively low comp engine you dont want too much duration. Mal and they boys @ Camtech are great, and dont get me wrong, they do have good grinds, but for a std rev range <10:1 comp 6cylinder, I wouldnt go much over 225* @ 0.050, & make up the rest of your AUC window with lift.

Just my 2c


My motor is fully rebuilt with 10:1 compression, and a 360HP flowing head.... The engine shop convinced me that was the cam of choice for my setup and engine. I will revving my engine to 6200.

 

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