just measure + calculate the CR and save the gasket. if youre stressing over using suspect parts, why would you cut corners for the sake of a gasket?Originally Posted by House1983
if you've already built it up and torqued it down, measure the finished thickness so you never have to waste another one doing the same thing. not worth re using it .
The only reason I was gonna do it this way was because when I built my last one 14 years ago that's how we did it.
We built it all up then took it to and engine guy who did some calculations!!
If the only way to work it out is using the gasket then I'll buy another one!! Just didn't want to spend the £170 if I didn't really have to!!
You reckon it's calculatable (is that a word?!?) without building it up??
I'll see what Jay at Modus says about the best way to work it out.
I mean I could run at 12.5:1 but everyone I've asked thinks it's a little high and it should be 11.5 to 12 max!
Last edited by House; 12-04-15 at 10:03 PM.
Measure the bore stoke piston dish if any the gasket thickness and the combustion chamber of the head and you have your cr
I think what he was getting at is why you are so anxious to build this engine with some new parts yet intend to use a used head gasket.
12.5 is pretty high tbh
Crossed wires here I think!!!
i have a brand new comitec head gasket for this engine.
when I last built a power XE (14 years ago) the guy I built it with said the only way to calculate the CR to machine the Pistons was to dry assemble the engine, with head and gasket, then we sent it to a guy who worked it all out and machined the Pistons.
Now I see that this isn't needed at all as there are CR calculators on the internet that are easily utilised. Just need to CC the combustion chamber, top of the piston and know the compressed gasket thickness and it can all be calculated.
When I asked the question about reusing the gasket I was meaning re-using the brand new gasket I have that I would have dry assembled the engine with.
I hope this all makes sense now?!?
Ah righht yeh ignore me thensorry for confusion, hope you get sorted
Not at all mate, I don't think I was very clear in my question!!Ah righht yeh ignore me then
ill get the Pistons measured and the head I need to have the chambers matched anyway so this can be done at the same time and I've read the gasket is 1.3mm when compressed so with all that we can work it out then machine the Pistons accordingly!!
I'm glad we had this little chat cos I've learnt something and made myself look like a Nobhead all at the same time!!
iirc cometic gaskets are reuseable.... half a problem solved
Regarding calibration (mapping). What ECU is it? Invest in a wideband lambda sensor and get cracking yourself. Ignition is tricky but generally its pretty safe from the first mapping sesh, then play with the fuel etc.
Build it.
All I wanted was a Pepsi, just one PepsiFar from suicidalStill I get them tendenciesBringing back them memories
That I really miss when I reminisce
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