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my ef 4.0L 

 

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 Post subject: my ef 4.0L
Posted: Sun Jun 22, 2008 1:13 pm 
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anyone know if you can get straight cut gears for a worked ef 4.0L engine
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Posted: Sun Jun 22, 2008 7:56 pm 
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what straight cut gears for timming???


if so how do you plan to get that to work? it timming chain
see pic

 

 

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Posted: Sun Jun 22, 2008 7:59 pm 
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Either that or for the 'box.

 

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Posted: Thu Jul 03, 2008 3:06 pm 
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well i dont know thats why i`m asking to see if any one makes straight cut gears to replace the chain. Just like v8`s go straight cut gears so you have no timing chain
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Posted: Thu Jul 03, 2008 7:13 pm 
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I've been looking for years, and have never found any.

 

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Posted: Thu Jul 03, 2008 7:55 pm 
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Thats because no idiot would make them.

Think about it, the front end would end up looking like a Lucas Oil Stabiliser Display.

You'd be better off with a belt setup. but once again, what for and no-one would and too much work for a aussie engine.

 

 

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Posted: Fri Jul 04, 2008 11:36 am 
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Krytox wrote:
Thats because no idiot would make them.

Think about it, the front end would end up looking like a Lucas Oil Stabiliser Display.

You'd be better off with a belt setup. but once again, what for and no-one would and too much work for a aussie engine.


Running a Jim Mock DEV 5 cam, I "stretched" the timing chain and broke the chain guides TWICE in the first 11000km of my rebuild!!!! Straight cut gears would have eliminated this issue and saved me $2000 in repairs [the second time a pieces of the chain went into the sump and destoryed the oil pump as well. The car stopped in the middle of Liverpool. $$$$ expensive trip getting it towed home + the time off work with no car + cancelling my holidays because I used up the money on the repairs !!!] And yes, I did realise that it would end up looking like a Lucas Oil display, but I wasn't concerned if it resloved my issues!

Anyway, thats just my feedback. Hopefully others can learn from my experiences.

 

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Posted: Fri Jul 04, 2008 12:26 pm 
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how often do the chains on an i6 need replacing, if at all?

 

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Posted: Fri Jul 04, 2008 7:22 pm 
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XR6EB wrote:
Krytox wrote:
Thats because no idiot would make them.

Think about it, the front end would end up looking like a Lucas Oil Stabiliser Display.

You'd be better off with a belt setup. but once again, what for and no-one would and too much work for a aussie engine.


Running a Jim Mock DEV 5 cam, I "stretched" the timing chain and broke the chain guides TWICE in the first 11000km of my rebuild!!!! Straight cut gears would have eliminated this issue and saved me $2000 in repairs [the second time a pieces of the chain went into the sump and destoryed the oil pump as well. The car stopped in the middle of Liverpool. $$$$ expensive trip getting it towed home + the time off work with no car + cancelling my holidays because I used up the money on the repairs !!!] And yes, I did realise that it would end up looking like a Lucas Oil display, but I wasn't concerned if it resloved my issues!

Anyway, thats just my feedback. Hopefully others can learn from my experiences.


I had the same issues with my dev5 cam/head kit. I had the chain and gears and guides replaced the next day after we fitted the kit. Cam stretched the chain again, took the cam back out 4 weeks later and put in the stock xr cam, then put in a billet from surecam - no problems since. I wouldn't mind the straight cut gear setup, even if it is a bit noisy. Once I get the block rebuilt, a new chain will go in again.

As quoted, I hope ppl learn from my experiance as well.

 

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Posted: Fri Jul 04, 2008 9:18 pm 
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XR6EB wrote:
Krytox wrote:
Thats because no idiot would make them.

Think about it, the front end would end up looking like a Lucas Oil Stabiliser Display.

You'd be better off with a belt setup. but once again, what for and no-one would and too much work for a aussie engine.


Running a Jim Mock DEV 5 cam, I "stretched" the timing chain and broke the chain guides TWICE in the first 11000km of my rebuild!!!! Straight cut gears would have eliminated this issue and saved me $2000 in repairs [the second time a pieces of the chain went into the sump and destoryed the oil pump as well. The car stopped in the middle of Liverpool. $$$$ expensive trip getting it towed home + the time off work with no car + cancelling my holidays because I used up the money on the repairs !!!] And yes, I did realise that it would end up looking like a Lucas Oil display, but I wasn't concerned if it resloved my issues!

Anyway, thats just my feedback. Hopefully others can learn from my experiences.


it'd be easier and cheap to just buy a different cam. the cam is the problem, not timing chain.

 

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Posted: Fri Jul 04, 2008 9:25 pm 
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I had similar issues on a 4.1 engine I had rebuilt. The combination of Stage 4 cam and high volume oil pump did the damage - but on that car it was the dizzy drive gears that got munched. Apparently if you had big valve springs the cam would flex as well causing a poor fit to the oil pump gear.

Some very very carefull thought is required for big cams.
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