foreigneRS

hard to tell from a photo i know, but is there any chance that this can be repaired (for use at stg1 only) and at what cost?





















thanks for any advice

MAD EVO 4

I would say no mate sorry

The Youth.

iTrader: (1)

does look bad, but I know amac engineering who built my engine are experts in rebuilding alloy heads, I have seen some of there work when damage has been similar to this and you would never know! Cost may be a factor tho, cossie heads are still around at the mo just., and im sure the one I saw with damage like this was a bda head or something equelly valuable where repair was the cheapest option.

steve

mechanic28

iTrader: (5)

that is scrap mate imho!in fact 99.9%

JTECH James

iTrader: (13)

you would be suprised, i reckon it may go,

but you would have to ask a repairer tbh, as its them that have to do it, not us!

Cragrat

iTrader: (4)

oof thats nasty mate,one on ebay ported n polished etc

item no 290268660487

BigErn

A bloke called Ken from Teeside has had similar recently where all 4 valves have had the heads snapped off and mashed into the piston and head and he is going to get it repaired.

It happened on his 6R4 at over 9k rpm

dave cos4x4

iTrader: (5)

that head looks a bit thin,better getting another one imo.

BigErn

For the price of what it costs to fix you will probably be better getting a new one anyway

tabetha

That's bad, but really good piccies though, hope you get it sorted ok.
tabetha

MAD EVO 4

also what is the cylinder bore like on no.4

coswurv

iTrader: (8)

Its not just the head you've got to worry about there, if you turn the block over and put no4 to the bottom i bet the bore is trashed.

cozmeister

iTrader: (1)

I'm not an expert but I think you need a new head, piston, 4x valves and most likely a block if the cylinder bore's been scored as much as the head and piston have been mashed! What was it doing when it went?

dojj

iTrader: (3)

the head looks lke it's toast mate

i'd be more worried about the bore to see if it's survived, if not, it might be worth getting hold of a decent engine as opposed to forking out for new bits and bobs depending on what you get quoted

louie1

maybe some bottom end shell/crank damage as well. cheaper to replace it.

GARETH T

everything can be repaired, but im sure the amount of hours needed to get it back would outstripe the cost of a second hand one

Dave McB

SPAM lol

New head time.

I believe that one may just manage to (once its ported and polished again) become an excellent doorstop

DMC

G2RSR

easily repairable imo

http://www.guy-croft.com/viewtopic.php?f=2&t=552

PAUL S

iTrader: (8)

Ive an old head here with similar damage, a lot of the ali mush you see in the bowl is actually from the piston, once thats removed the head is quite resiliant to damage.

You have nothing to lose by clearing that away and look at the actual damage, but even if it does clean up, the ali around the valve seats may by compromised as discussed elsewhere, and is it worth the risk of re-use only for it to drop a valve seat.

Biggest problem will be finding a decent used head as most out there also need money spending on them and usually only have one more go left in them before they are scrap as well

fuzzy

how can you tell that?

Garage19

Nick,

Its total scrap!

I'll give you a tenner for it?

Doug (with an AC TIG welder)

mechanic28

iTrader: (5)

dont trust a doug!

Karl

Yes I can repair that for you, it will require full welding of the chamber, 4 new seats fitted, chamber remachined back to shape, new valve guides, seats re-cut and head re-machined. Cost from myself will be around £300, so given the thin state of the head, I'd advise a good 2nd hand one.

foreigneRS

thanks a lot Karl that's a good price. i'll consider my options

AlexF

Bin it - a new (not new new) heads arnt hard to find.

Whats the block like?

silky16v

iTrader: (1)

you can tell if you look at how much flat surface there is where the Water Temp sensor is located (the bracket has been removed when the head has been skimmed previously) as in top right of this picture, you can clearly see that it been skimmed very flat and i'd say if you measured that head it will be well below 138.20mm or even lower

rog

iTrader: (2)

Stu @ MSD put up a post about this a few days ago, helps alot when looking at a 2nd hand head, which most of them are nowadys obviously.

mk2rstaff

absolutely awesome work done by that fella, looked like a lot of man hours there, but i suppose for a race spec head thats hard to come by what else can you do.

foreigneRS

getting another head is not an issue - i have a wonderful brother who takes care of that sort of thing

don't know what the cylinder is liked, i haven't turned it over yet

i'm thinking of ditching the YB and putting in a n/a duratec (or similar - has anyone done an S2000 conversion?) and stripping it for a track car

THE RADMAN

iTrader: (2)

did the valve seat drop out?

jaimesdna

iTrader: (3)

that really is some skill there

fuzzy

this part here gives the head thickness away? it shouldnt have a flat area?

foreigneRS

i'll measure it up at some point and see.

don't know the cause of failure, would be interesting to hear some opinions and experiences. the car was cruising along at 70mph on the motorway in 5th, so not under load or anything. inside of exhaust manifold elbow is quite white and the spark plug for no. 4 had the nipple missing.

silky16v

iTrader: (1)

in theory yes just not as flat as that though a brand new head has no flat area and the outta rough casting can still be seen a head at 138.70mm will have a very small flat area around maybe 2-2.5mm by the looks of that head its 5-6mm at very least, you can also see the same effect around the exhaust manifold where it joins the head

glancy2081

i am not saying hat this is what caused this failure,but can any precautions be taking to ensure that the valve seat area does not fall out as happened in jtechs head

the original

give it to me i will weld the whole head half an inch thick over the whole head then sand it back down

foreigneRS

i'll just give it a skim over with some chemical metal and then get the dremel on it