DOO

1st a big thanks to (MADade) ADE for have the car at his garage and showing me what to do and doing most of the work takeing the head off and (ark1) big bob for his lifting

After the cambelt tensor came off at 120mph last night

Had nightmare takeing the head off i found i had a long stud cov did not know that before also had to that the turbo and manflod off as will to lift it out:

Don`t look to bad just a few marks on the tops of the pistons bores are fine all vaules are bent not sure on the guides yet?

Are the pistons standerd ??

also found a pair of bd10 cams

Why a long stud cov anygood can they be used again ??

Could of been a lot worse











Heres a pic of Ade`s behind mine also broken waiting on a berine diff


530+bhp / 185.5MPH MAD saff (in the wet)

pee vee

wicked news that it aint too bad mate
hope shes all back together soon

least it dont look like its damaged the head !!

will the pistons be ok

DOO

They look fine just a few marks to the tops that will clean up

ark1

Any t ime you need help mate

richm

pistons don't look standard from the pics.. low comp to some degree IMO. are there valve cutouts machined in, or are thay all dents??

Karl

Pistons are not std, they have had the bowls machined and it appears the perimeter of the crown may also have had the very top machined down. As for what C.R that gives you I can not say without buretting the piston crown and measuring the piston protrusion at TDC.


Check the pistons have not cracked where the valves have hit and if not then carefully dress the tops of the pistons to remove any sharp edges/burrs.

With the head inspect the valve guides but I would assume several will be cracked due to the valve stems being bent. When you replace the guides also ensure you cut the seats correctly before trying to lap in your new valves.

Block appears to have conventional 6 long studs. Don't go trying to use a Steel headgasket unless you intend to machine the deck face of the block, otherwise keep with the std type such as the 611 or the 1261 you had on there allready.

the strut brace

those pistons look fooked to me mate, they look like they have valve cut outs but i fear they are dints from the valves hope its ok though mate

CraigN

hmmmmm

your pistons look like they have come into contact with valves mroe than the once dude

if there not cutouts !

also why would you long stud and engine and fit a grp a headgasket ????

do you know the spec of the engine ?

looks like more than a stage 3 build to me speak to the builders of the engine

ignore what i said as karl jsut answered it

DOO

Thanks for you advice Karl

It looks like dents on the pistons but not sure TBH

The engine was built by bluesprint about 7000 miles ago that the owner before me had it all done.Did not have any paper work for the job. as it was a favor for favor type deal.

So i am clueless about the spec..

Was told it had low comp but had nothing to prove it and i did not know about the long stud whats that all about?

MAD Ade

iTrader: (1)

Check the pistons have not cracked where the valves have hit and if not then carefully dress the tops of the pistons to remove any sharp edges/burrs.

Haven't cleaned them properly yet, will do so tomorrow and inspect them very closely. The photos make the valve contact look worse than it is because the valves have taken the carbon off where they hit.

Ade.

heeman10

Carbon or no carbon, there's no denying there's been valve-to-piston contact there, same for the other three pistons from the looks of things. Would it be wise to use them again? (Actual question, not bitchy rhetorical statement!)

foreigneRS

no problem to use them again, as long as any sharp edges are taken off to prevent stress raisers and hot spots.

St3V3_C

Glad it doesn't look too bad mate.

Alvyn

iTrader: (1)

I'm yet to see a Cossie that hasn't had some sort of valve 2 pistons contact that looks to be light contact IMO compared to some I've seen

richm

mine has no contact marks at all
but agree it is uncommon!!

GARETH T

thats because you older ( ) men know how to do nice gearchanges, where us younger ( )men miss the gears and overrev the engine

DOO

Cheers lads for you helpfull comments

TBH i happy now i found i got low comp pistons and long stud cov i did not know i had

DOO

Anyone got any idea what sort of power the above could handle roughley??

Damo V

you need to know what the CR is mate EXACTLY as Karl said before you talk about mapping / bigger power, plus you will have to junk baby turbo

My advise would be to get somwone like Karl o rebuild your head and run you through measuring the volume of the bore, then they can work out exactly what CR is once head has been/ is being built

Stavros

Il put money its 7.5:1 bearing in mind the pistons have deffo been dished and was done by bluesprint

Damo V

that will quite possibly change a little once the head been repaired /worked

DOO

I will get the CR checked some how

It`s getting even better now and i thought i had a standerd rebuilt engine

Low comp
long stud
ported head ?

god knows what cams or crank rods i got etc..

just took the inlet off and found this done to the head don`t look standerd to me??

Rene

glad the damage aint to bad mate

DOO

Cheers matey

DOO

looks like it could do with a polish to me or is ment to be rough in the ports in the head??

Graceland

looks like someone has been busy and opened up the inlet tracts on the head too Doo

Phil

iTrader: (1)

DOO, I don't think they are supposed to be polished. I'm pretty sure Stu said he doesn't polish them when he does them (may be wrong on that!)

The DIVA

iTrader: (3)

Inlet ports are meant to be slightly rough mate,if they are polished water droplets form on the polished surface and break up the air flow...

Graceland

surely you mean fuel droplets as water doesn't burn very well

Alvyn

iTrader: (1)

when using water injection maybe

Graceland

can't honestly see water atomising and gathering on polished surfaces tho like fuel does

Rhys

Gutted!

lol my piston wasnt half as bad as those when valve seat went and wa sonly one piston. I rebuilt it though as i couldnt put it back together knowing pistons was like that Whack some new ones in there DOO at last u know its 100% then mate.

xr4x4rs

iTrader: (5)

head wise mate

put gasket on the inlet and exhaust and take a pic so we can see the port sizes

inlet side shouldnt be polished but exhaust side should

but by the looks of things not that much damaged in the engine bay

DOO

Took out the vaules all bent but the valve guides are fine


How the you measure how much thickness is left on The head before i get it skimed??


Pistons should clean up ok not sure if the exasust ports have been ported should be able to tell once cleaned up

digita1dragon

Think you want to measure the width of the combustion chambers Tone and work it out from there

xr4x4rs

iTrader: (5)

there should be a brass indicator in one of the corners of the head

this is your indication mark on how far the head can be skimmed

but if its flush then its usually on maximum skimness alll ready

DOO

Ok mate i can now see the brass thing on the left top corner but me mates got the head i get him to check ot tomorrow

xr4x4rs

iTrader: (5)

thats the one mate top left of the pic

DOO

Cheers mate

Got a few bent vavles all 16

Guides are ok though

silky16v

iTrader: (1)

would advise u change the guides too chances are u won't be able to see any cracks that may have appeared in them.

you don't want a piece of valve guide dropping into your engine