Cylinder head re-skimming...

[kam-325i]

Just a quick one....

When you send a head to be re-skimmed, do you send it complete, with the cam and valves still fitted, or stripped ?

[--alpina--]

you can send it with valves and cam, but strip everything else around the head, like, manifolds and thermostat housing....


regards

jimi

[Chris-W]

Give it to them complete, Keith. They should deal with it all.

[kam-325i]

Any idea of price, ball park figure......

[Templ8e30]

It's just cost me £30 + vat for a skim on an M20 head, top qaulity job too.

Cheers,

Iain T

[kam-325i]

Thats cheap......er than i was expecting....things are looking up !!!

[Chris-W]

Same here - £35.25 with the dreaded.

[mikey-t]

what if you were to add a full port and polish to that>? anyone???

[Turbo-Brown]

Probably about £500 or £600+ if you get someone who knows what they're doing.

[jamesc]

I paid 100 quid to have my head skimmed, but this also included cleaning, removing 3 broken exhaust studs, recutting all the valve seats, and sorting the exhaust valve guides

[mikey-t]

well i may have a head, i would need it skimming, cleaning and stem seals installing, we talking much work?

[march109]

Hey Mikey-t any one who offers you a price for polishing your head is just after your money. There is no polishing of anything...this is a term that has been associated with cylinder head flow development for years and years...and its just simply incorrect! maybe in the 60's-70's chambers were polished...but its been long proven that this practice is simply poor practice with todays modern design and manufacture.

[march109]

or after your body!!! just re-read my post, ha ha "polishing your head!"

[mikey-t]

oh right well that was me asking for it but really not worth it on this small engine
,,now i just need the above

[march109]

Its not cheap either if done by a pro engine builder, I normally pay around £40-60 an hour just to have the head flow bench tested.

Although I know people who have bought spares attacked them with a dremel and got as good gains as pro builders, if you have some basic idea of theory it is possible, since there is no exact science to it, its just a case of taking some metal out testing it then taking some metal out and testing it and so on until there are no gains or until you start making a loss.

Read Performance tuning for the four stroke engine, for usefull DIY tips, if you want to go the dremal route!

[mikey-t]

i just want some stem seals installed and a head skim, think the guy who`s post it is just wants the head skim

[march109]

what if you were to add a full port and polish to that>? anyone???

sorry man thought you had asked about a full port and polish??

[mikey-t]

yeah i did until i saw the 5-600 price tag and little benifit!

cheers anyway!

the whole point is my cylinder head is mullered and im just buying a second hand one which i will skim , clean up etc to fit until i can afford a 325 conversion

[march109]

I'd say that was cheap, I'd love to know who does it for that? but anyway...

How mullered?? Why not just keep saving for the 325 or is it waaaay off? cos thats the way to go, more cc's=more hp per £.

[mikey-t]

ermmm 2 manifold studs sheared off in head when someone attempted to drill them out (not me ) theyre drill bit obviously caught and snapped round as about 1/2 inch of cylinder head wall is missing, i have a very very slight oil leak from this area, and head gasket symptoms, so im thinking a water jacket or oil way has been hit...


i could afford the 325 engine its just all the ancillaries, time space andeffort thats needed that i cant so i want to get a head and work it then when i do have time / when engine does blow. i have a nicelly worked head ready to drop in