Chat & Social > The Bar - General Chat

I need help ;-)

<< < (10/10)

karlo:

--- Quote --- If you can get the head off and over to me, I can get it repaired at work.
Means you can keep your existing head and not worry about CR problems etc etc.


Regards

Ian
--- End quote ---


If you need a lift over with it mate just give a shout!

gtomo2:

--- Quote from: "karlo" ---
--- Quote --- If you can get the head off and over to me, I can get it repaired at work.
Means you can keep your existing head and not worry about CR problems etc etc.


Regards

Ian
--- End quote ---


If you need a lift over with it mate just give a shout!
--- End quote ---


Thanks for that just may be taking the head off and giving it to Ian as it may be safer than me drilling throught the head and out the other side. Will let everybody know over the weekend. it will depand on me geting the works van for a few days

Porny:
Just to add another spanner in the works...

This cylinder head…. been doing a bit more thinking – and I've probably just been a bit pedantic:

 
First off, a warped head will not directly affect the CR.  All you are doing is measuring (with liquid) the volume of one (or more – see below) of the head chambers.
When you measure the CR, unless you're building a blue printed race spec affair, you'd only measure one head chamber and one piston/cylinder (so a warped head wouldn't show up)
Only if you wanted everything to be absolutely perfect you'd bother measuring every head camber and every cylinder –and then calculating the average.
 
Before you even started this though, you'd check that the head wasn't warped (well, more than an acceptable tolerance) by having it slightly skimmed, or just with a flat edge and a set of feeler gauges.  And then, even if you did measure every head chamber, you'd still only be taking an average.  
Though, if we are talking race spec engines, and thus you wanted every chamber to be the same you'd just do a bit of machining  :wink: ...  the main thing is that the head face it flat (well within tolerence)

 
If we take your engine to be completely standard and running standard CR then….
 
Then unless the new head is massively skimmed, or from some super low compression ratio engine, then you shouldn't really have any issues.
 
If your engine was brand new (and hadn't done 'x' amount of miles) then it would be worth checking, but in this application and usage if the CR differs between banks it really isn't going to make that much difference.  Not when you consider loses that already affect a 'used' engine.
 
As mentioned before, you could just measure the height of the head itself… although not the most accurate method; it would give you a basic idea.
 
When the head is off (easier access) just measure it's height, and then measure (in the same place) on the new head.  You do need to fairly accurate to do this though (well to get a reading that's even worth taking) – we are not talking cm and inches here!!
 

In saying that, I will still happily repair your current head... will even give it a wash and crack test if needed!!!  :wink:


Ian

Navigation

[0] Message Index

[*] Previous page