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Posted: Mon Sep 11, 2006 12:44 pm 
Getting Side Ways
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Ride: 97 R33, EF XR8

Location: CAMPBELLTOWN
NSW, Australia

Save all your time and money and get a Rspec6 cam from JaysRPD.Awesome cam and good power.Give him a call. :)
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Posted: Mon Sep 11, 2006 12:47 pm 
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Ride: 05 BA MKII XR8, 95 EF gli Wagon

Location: Gosford
NSW, Australia

In my case i think the chain slap is mainly caused by the amount that has been shaved off the head and useing an au head gasket which causes slack in the chain, than by if you were just installing the cam into a stock head.

Every one revolution of the timing chain in my car causes slack in the chain at the top guide just after the cam sprocket, it them slap against the top guild as it gets tension again.( sounds like 1 very noisey lifter) It doesnt slap all the time, it might only slap every 10 or so revolutions. I think that my tensioner is having problems keeping the correct tension.
I am sure that the chain slap will wear out the guide and chain quicker but I just dont have the time now to look into it any more to find a way to make it stop.

Bucko

 

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Posted: Mon Sep 11, 2006 1:05 pm 
Getting Side Ways
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Age: 33

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Joined: 26th Apr 2006

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Ride: 97 EL XR6

Power: 162 rwkw

Location: liverpool
NSW, Australia

mine will slap worst at between 2000-2500rpm, if i hold it there it will continuously slap until the revs drop below or go over that range...

if the cam is causing the problem will a different cam profile fix it? or has the damage been done?

 

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Posted: Mon Sep 11, 2006 1:49 pm 
Getting Side Ways
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Ride: BF XR Turbo

Location: Castle Hill
NSW, Australia

changing the cam wont fix it, the problem is to do with the slack in the chain, not the cam/camgear.


-mitch

 

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Posted: Mon Sep 11, 2006 2:25 pm 
Getting Side Ways
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Age: 33

Posts: 1442

Joined: 26th Apr 2006

Gallery: 6 images

Ride: 97 EL XR6

Power: 162 rwkw

Location: liverpool
NSW, Australia

ok so in my case, i have already checked, cleaned and reset the tensioner, guides are fine, cam gear is fine, rocker gear is fine, so the only other thing it could be is chain strech, which people are saying doesnt happen in an I6...

 

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Posted: Mon Sep 11, 2006 2:41 pm 
Fordmods Junkie
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Ride: Kia Rio - 1.4L Auto

Power: 238 rwkw

Location: Westside
VIC, Australia

Chain stretch can happen... From memory there has been a few posts regarding it. If you have possibly decked the block and the head, plus a thinner head gasket, it would cause the chain to be a little too long.

Or if the tensioner has made the chain too tight, it may cause it to stretch.

If you have changed chain guides, the bolt that holds the left guide on may be too tight, which is not allowing the tensioner to push the guide over and up the tension on the chain. This would give the appearance of a loose chain.
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Posted: Mon Sep 11, 2006 2:46 pm 
Getting Side Ways
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Ride: 97 EL XR6

Power: 162 rwkw

Location: liverpool
NSW, Australia

yeah my the head has never come off, guides are still original, only thing that has been touched is the cam, it could be possible that the installer didnt reset the tensioner and as you said it was too tight causing it to stretch...

 

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Posted: Mon Sep 11, 2006 3:15 pm 
Parts Gopher
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Location: Canberra
ACT, Australia

I have replaced my timing chain, guides and tensioner and still get a bad timing chain rattle between 1000-1400rpm which is right on idle.

I'm running an AU head gasket & not sure if the head has been shaved.

Is there anyway to fix this problem?
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Posted: Fri Sep 15, 2006 12:03 am 
Getting Side Ways
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Ride: V8 T5 Fairmont & BA XR6T

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NSW, Australia

as already said, it could be your chain, guides or tensioner, however big cams do slap chains, and they either do it at low revs or high revs. Tiny changes such as LSA's can fix slap, but it defeats the purpose. The reason why it slaps is its coming off lobes and being caught by the next lobe. Only skips a bees d**k, but its enough to make the chain slap

 

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Posted: Fri Sep 15, 2006 9:06 am 
Getting Side Ways
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Ride: 97 EL XR6

Power: 162 rwkw

Location: liverpool
NSW, Australia

sorry but what are LSA's?
also... after running a big cam that causes slap, can the slap be overcome by changing to a smaller cam? or has damage been done?

 

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Posted: Fri Sep 15, 2006 9:18 am 
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LSA = Lobe Separation Angles, to do with the cam geometry, not an adjustable feature.

 

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Posted: Fri Sep 15, 2006 10:35 am 
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Location: Canberra
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So does this slap cause any damage? I take it the guides won't last as long?
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Posted: Fri Sep 15, 2006 11:26 am 
Getting Side Ways
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can break guides, but if it hasnt then your right, if you put a different cam in, not necessarily smaller you shouldnt have any probs

 

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Posted: Fri Sep 15, 2006 2:27 pm 
Getting Side Ways
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Ride: ed fairmont ghia, ed gli

Location: mildura
VIC, Australia

you idle at 1000 - 1400rpm?? f**k that doesnt the revin piss you off?

 

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Posted: Fri Sep 15, 2006 3:16 pm 
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Joined: 21st Feb 2005

Location: Canberra
ACT, Australia

adrian` wrote:
you idle at 1000 - 1400rpm?? f**k that doesnt the revin piss you off?


HAHA, I get the timing chain rattle between 1000-1400rpm. Idle is 1100-1200rpm, any lower and the car stalls under steering load since I don't have the power steering pressure switched hooked up to the Megasquirt ECU.
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