Porsche964FP

The Fiennes gig went to someone else - was too late.

As for the engine - Craig called, the rockers are damaged... Although it may not be the only problem as it may have damaged the crank... or have I miss understood something? Either way I'll get a more on the diagnosis tomorrow... Fingers crossed...

freedman

Ahh, not the news we were all hoping for

Heres hoping the fix isnt too painful

GeorgeK

Overreved the engine? How can a rocker be damaged? Normally they break in an overrev situation, being the weak link. Let's hope no valve is bent.

parsecnc4

Wouldn't a leak down give good insights into the condition of top-end?

Cheeksyboy

Forgetting that our engines are horizontally opposed, and the fact that the pic is of an earlier 911 engine (the basics are still the same), there are a lot of bits that would otherwise fail between a rocker and the crank.....so I think you mis-heard. I would have thought that if a rocker was damaged, then the corresponding valve would have also been damaged...and I'm sorry to say this could also damage the piston head.....and from there any bits of metal can cause more damage....but it's Friday night and I don't want you to have a bad weekend worrying about what it may be.....

alexjc4

Not yet worst case scenario, but not great. If you can Frank see if you can get some pics yourself or from GTOne of the damage they've found so far.

I seem to remember GTOne felt the rocker seals were probably leaking, also they thought the rockers weren't installed correctly. I guess that might tally with damaged rocker, if thats whats gone it will likely take the cam out at one end and/or the valve at the other.

@Cheeksyboy that looks like a newer, at least more sophisticated, engine to me: twin overhead cam, hydraulic tappets (no rockers), variable inlet cam.

Porsche964FP

So if the rockers, cams, valves are damaged - those parts will need to be replaced? I'm deep into a top end rebuild at this stage? And presumably there's untold damage which could have been done to the bottom end.. crank, bearings etc?

alexjc4

GTOne will need to call it, only they can evaluate the extent of the damage and knock on work needed. But here are some possible scenarios;

A) the hope is that the damage is clean (ie no little bits of debries floating around) and restricted to the rocker and cam. That way you could get away with fitting some used parts. maybe without even dropping the engine. The only worry with this "easy" fix is that you would want know the root cause of the original failure really to be sure it wont happen again. For example it may be the oil spray bar that lubes the rocker may be clogged, meaning the rocker and cam lobe rip each other up. If you dont clear the blockage, it will just happen again down the road some time.

B) if the valve is shot, but it hasnt hit the piston, in which case the head will need to come off to fit a new valve and valve guide in addition to above.

C) worst case, piston and/or crank damage, in which case its full rebuild time really.

Porsche964FP

Appreciate your insight - thanks Alex. Let's change subject - how are the wheels? Any close up shots? They look really great.

alexjc4

the wheels are coming on nicely, unusually for me i've just decided to take as long as it takes to paint and sand and paint until i'm happy, normally i get impatient and rush to the end of paintwork with disapointing results. there're looking good and just need some protective laquer and a couple of weeks to harden before i put some tyres on. Just cant tell what they really will look like until they have tyres and are on the car as i've never seen this style on a 911 of any type.

Porsche964FP

I'm sure they'll look great, so now you have three sets of wheels for the 64! Thank gosh for the big garage!

What are the plans for the Cup1s? And what are you thinking tyre wise?

alexjc4

Well yes the garage is mostly wheels and tyres now.

4 masitaly wheels w no tyres
4 cup1s with tyres on
4 spare/drifto 17 tyres for skyline
2 spare/drifto 16 tyres for skyline
4 forged nissan 16" wheels with tyres for skyline

i am a special type of idiot!

Tyres for the masitalys will be chirpy cheap falkens 452s i think - £390 for a set.

Cup 1s may get something more fruity. . .

Porsche964FP

So when's the good Doctor opening for business?

So cups for track duty and masitaly for show - NICE! Also I still have my teardrop mirrors if you wanna carry on the update - they're black too...

ALEX P

Hi Frank, sorry to hear about your engine. Hopefully it won't go as far a full rebuild.

When mine started coming apart the more I looked, the more I found so it just made sense to renew/upgrade most parts 'while you're in there'.

https://rennlist.com/forums/964-foru...e-rebuild.html

FWIW if the engine is out and the top end is fully stripped down you're in pretty deep anyway - the bottom end isn't a great deal more work or cost in the grand scheme and you end up with a complete new engine. Having said that I have no idea about the history or mileage of your engine.

I would be very reluctant to send it across the pond to get the work done when there are numerous specialists here that would do as good a job. If you were unlucky enough to have any post-rebuild issues that needed looking at/rectifying then I would want the builder to be accessible to me, even if it was a minor oil leak!

Hopefully it won't be as serious as any of this anyway, I would happily recommend the chap that rebuilt mine. They rebuild a lot of engines for many 'Porsche specialists', especially when it's a more complicated or non-standard build, is fairly local to us and very sensibly priced compared to others if it ever comes to it.

Best of luck, hope it all works out.

Cheeksyboy

What do I know....you're the Dr !!!!!

Frank, Still hoping it's nothing major for ya! Guess you've not had an update?