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valve train problems!!! 

 

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 Post subject: valve train problems!!!
Posted: Tue Jul 10, 2007 7:01 pm 
Stock as a Rock
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Location: sydney
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hi there, i have a eb xr6 that has been set up similar to a dev 5 jim mock motorsport kit except with a milder port. the car runs a dev 5 cam however i am not totally happy with its performance as i beleive it is causing valvetrain issues with lash and timing chain. If anyone could shed some light on this i.e is it the way being setup or is this a common problem with this cam.

Also can anyone recomend me a cam that makes good power and more torque as that what was lacking with this cam, if you recomend a cam can you tell me some of the performance you got out of it.

thanks!!

 

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XR 1992 161 RWKW 14 sec 1/4s

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Posted: Tue Jul 10, 2007 9:14 pm 
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Joe from "crescent motorsport" has created some great cams... and he's a site sponsor.. and also located in sydney! (liverpool)... can catch joe in the forums above the 6 cylinder forunms... under "crescent motorsport"...

 

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Posted: Tue Jul 10, 2007 9:19 pm 
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161 kw and 14 sec 1/4 miles..... doesnt sound like its running to bad lol

What exactly is the problem, timing chain slap, noisy lifters?
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Posted: Tue Jul 10, 2007 9:30 pm 
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DEV 5 = chain rattle

 

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Posted: Tue Jul 10, 2007 10:05 pm 
Stock as a Rock
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Yah that power and time was before the bad running hit. it now has like a chain rattle or slap and the timing is not advancing at all, it is staying on the base timing but that is a computer related problem. what should be done about this timing chain problem??? do you rekon changing cams is a good idea. sgould i replace the timing chain?? thanks

 

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XR 1992 161 RWKW 14 sec 1/4s

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Posted: Thu Jul 12, 2007 9:40 am 
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I've got the same issue on my falcons, spoke to my mate Dave (Voxace) he reccons a tensioner may have cacked itself.

And yea, thrashing your car does not do it justice (mine used to be fine :P)

 

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Posted: Thu Jul 12, 2007 10:23 am 
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My car also has this problem with a RPD Rspec4 cam. It is most noticeable just off idle.

Have heard replacing the tensioner spring with a stiffer spring can help but haven't tried this yet.
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Posted: Thu Jul 12, 2007 6:45 pm 
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XR 1992 wrote:
Yah that power and time was before the bad running hit. it now has like a chain rattle or slap and the timing is not advancing at all, it is staying on the base timing but that is a computer related problem. what should be done about this timing chain problem??? do you rekon changing cams is a good idea. sgould i replace the timing chain?? thanks


Love to see that dyno sheet. Mate, i think you are having a lend of us !!
A more mixed up post i'm yet to see.. Not advancing ? If that's the case , don't you think that could be your prob ?
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Posted: Sun Oct 07, 2007 3:10 pm 
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UMMM if you are querying the power it makes you should have a look around as their are a few cars around and on this forum that are making more than that. The dyno sheet will be posted up ASAP

 

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XR 1992 161 RWKW 14 sec 1/4s

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Posted: Sun Oct 07, 2007 3:13 pm 
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The chain noise was there prior to the computer/timing problem.

The timing problem has been rectified but still have the chain noise which i have know found out that falcons are common to make that noise when they have cams put in and that it is lash cause by the large cam.

Thanks!

 

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XR 1992 161 RWKW 14 sec 1/4s

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Posted: Sun Oct 07, 2007 3:24 pm 
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DYNO SHEET

taken at Autotech engineering at auburn.

 

 

Attachments:
20071007142042357.pdf [72.72 KiB]
Downloaded 114 times

 

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XR 1992 161 RWKW 14 sec 1/4s

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Posted: Sun Oct 07, 2007 3:54 pm 
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XR 1992 wrote:
DYNO SHEET

taken at Autotech engineering at auburn.


Hmm.. 161 rwkw from a dev 5, I6 with milder porting. You can tune my car anytime, seeing a stock BA Xr6 turbo has about 180 rwkw.
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Posted: Sun Oct 07, 2007 3:58 pm 
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If you have cam chain rattle then I would say it is the tensioner if that was all you did, my daughters has cam chain rattle but that is due to a head gasket replacement then shaveing the head square so now it has a rattle as the tensioner will not take it all up.

I have a rpd cam and no rattle as most car are not all rattly I find that if it wasn't doing it pryor to the install then it should not do it after unless you have had to much taken off doing the port work.

 

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Posted: Sun Oct 07, 2007 6:15 pm 
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The dev5 cam is known for this "problem". Im sure they will be able to offer some advice if you give them a call.

 

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Posted: Sun Oct 07, 2007 8:54 pm 
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nicebus wrote:
XR 1992 wrote:
DYNO SHEET

taken at Autotech engineering at auburn.


Hmm.. 161 rwkw from a dev 5, I6 with milder porting. You can tune my car anytime, seeing a stock BA Xr6 turbo has about 180 rwkw.


Mate, 161rwkw is quite easily obtainable from an E-Series 6, Extractors, hiflow cat, 2.5" zorst and a cam will do that, Grechie, OED666 (FFAU) and fordfreak ef have more power than that....

 

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