6.9 Misfire - getting worse

[koan]

Good news/bad news.

Maybe 6.9 rocker arms are a weak point.

I replaced all 16 about 5-6 years ago. Discovered about half of them were wearing when doing the basic position adjustment of the ball pivots while trying to quieten down top end noise.

The rockers have a hard running surface brazed to a forging, this is what had worn through. Each bad rocker had a narrow line worn across and through the hard pad where obviously different material could be seen underneath. No Cam damage fortunately, think I got it just in time.

Had the valve springs checked during recent valve job, they were all within a few percent of each other and on the high end of the spec. The gent who checked them said they were a pretty stiff spring so they could well be sufficient to handle big knobby lobes.

koan

[motec6.9]

Hi Cam i guess now would be a good time to go see Greg at Pro Engines 18 stephens rd Queanbeyan you will find he is very good and last time i spoke to him he knew a buissiness that could do billet blank cams for m-100 engines

[SELfor50]

Hi Cam i guess now would be a good time to go see Greg at Pro Engines 18 stephens rd Queanbeyan you will find he is very good and last time i spoke to him he knew a buissiness that could do billet blank cams for m-100 engines

You're a bloody library mate!! 

I'll be calling him first thing tomorrow, dropping your name of course. 

Any idea of a ballpark figure on those?  Would I get change from 1-1.5K you reckon?

[motec6.9]

Hi Cam www.proengines.com.au mobile 0448 826 256 not sure i asked when i blew motor in 2005 by the way have star motors gotten back to you about 6.3 performance cams in usa

[TJ 450]

That's a bit of a shocker.

Surely a rocker would not self destruct like this through normal use? I've had a very close look at all the rockers that I removed from the M117s and the M116. Even the engine with the pitted cams had reasonable rockers (just the typical wear line you mention, Koan).

I suspect that there may be another issue causing the excessive wear. Could the valve be sticking?

Tim

[motec6.9]

Hi Cam let us know how you get on and best of luck Now if only i could afford to buy the AC/DC highway to hell album that a work college has in the quokka with all band members signatures and yes that means bon scott on the cover oh well 10000 is to rich for me

[SELfor50]

That's a bit of a shocker.

Surely a rocker would not self destruct like this through normal use? I've had a very close look at all the rockers that I removed from the M117s and the M116. Even the engine with the pitted cams had reasonable rockers (just the typical wear line you mention, Koan).

I suspect that there may be another issue causing the excessive wear. Could the valve be sticking?

Tim

Agree...  Won't know exactly till I pull off the valvetrain.   It'll be a good learning experience.  I think there could also be something maybe with the valve sticking?!  But yeah, will pull it all off and see how I go. 

Geoff, I spoke to proengines, and he said he'd only refer it to wade cams or someone else anyway.  I've been referred to Camtech also - so will speak with them shortly.

Star motors haven't gotten back to me.. will send them another e-mail. 

I did get a response from Dan who has the supercharged EFI 6.9 in usa. (roadrunner) and have another lead to follow there.

As for the H2H album with all the signatures INCLUDING Bon's!  Just tell Southside engine's they'll have to wait till you pay off 10K for a CD.

[motec6.9]

Hi Cam i emailed starmotors in the usa last night 6.3 cams cannot be used and they do not sell 6.9 performance cams asked if i wanted price on standard 6.9 cams should have reply tomorrow on price for you 

[SELfor50]

Hi Cam i emailed starmotors in the usa last night 6.3 cams cannot be used and they do not sell 6.9 performance cams asked if i wanted price on standard 6.9 cams should have reply tomorrow on price for you 

Thanks mate, that's great.  I sent them an e-mail too.  Hadn't had a response yet.

Even standard 6.9 cams will be good.  I'm hoping even new standard one's won't be too expensive.
They have the high lift 6.3 camshafts listed @ $900.  Which realistically isn't bad at all.
Not sure if that's for both or the set, but I would think the set.

Anyway fingers crossed.  I know if they were ordered from Germany they'd be probably $25,000 each.   

[motec6.9]

Hi Cam i also sent a email last night to Wade Cams in Melbourne to see what they can do as i want higher lift cams for my engine let you know how i get on 

[motec6.9]

Hi Cam onto wiinner Wade have standard profile 6.9 cams available have replyed waiting for price

[SELfor50]

Hi Cam onto wiinner Wade have standard profile 6.9 cams available have replyed waiting for price

Just got off the phone with them.  They said they will re-grind a set back to standard - but they don't produce new ones from scratch.

$160 a pair to get them back to standard.

I can send the pair of my old engine down there, but I really need to find someone who can fix my farked cam.  Nobody has the balls to touch them.. or make performance ones.  Have spoken to pretty much everyone in australia (from google anyway).

Cam.

[oscar]

I can send the pair of my old engine down there, but I really need to find someone who can fix my farked cam.  Nobody has the balls to touch them..

Give me a crack at it .   
Add a bit of weld with my stick welder then grind away with my angle grinder...no worries mate.

But seriously, if it's $160 to grind to standard spec, would it cost much more to make them lumpy?  Is it a case of more time in the machine costs a little bit more or does the word "performance" automatically induce a price hike?  I assumed one could provide desired valve timing and the machinist dials in the settings.  Why doesn't anyone want to touch the good ones to make em lumpy?

[Big_Richard]

probably because they cost 3 grand each to buy new if they get f-cked up

[TJ 450]

Yep, they don't want to be liable for paying out such a huge expense when they stuff it up and you demand new replacements.

Tim