Compression Ratios, Gaskets & Combustion chamber Reshapi
- Thread starter 4000GT
- Start date
The 1UZFE EGR Delete Kit is available for sale here.
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ed_ma61
Guest
why does everyone still think thick head gaskets in the order of 2.5mm is a good idea? its beyond me that this thing still gets around in 'cuttin edge' tech discussions?!
it pays no attention to the fundamentals of the combustion process short of some numerical ratio of volumes which is about as crude a measuring device as a wooden ruler
where this conversation 'should' be headed is:
i would consider this level of mod well beyond the scope of members of this forum and either best left to a machine shop, or leave it alone all together and just do the pistons/crowns
it pays no attention to the fundamentals of the combustion process short of some numerical ratio of volumes which is about as crude a measuring device as a wooden ruler
where this conversation 'should' be headed is:
but i consider this level of modification significantly harder than what is elluded to above. a steady hand, a die grinder and basic understanding of combustion shapes is not enough. way too many times you see some jockey hack into a head with a grinder and produce such crap combustion chambers its not funny. unfortunately the net is full of examples as this, with lots of forum back-slapping going on making you think wow - that really is a god idea. unfortunately the guys that know how to do this stuff properly dont get on the net, and they sure dont post pics on forums.
i would consider this level of mod well beyond the scope of members of this forum and either best left to a machine shop, or leave it alone all together and just do the pistons/crowns
cjsupra90
New Member
One quick question,
The stock headgasket thickness, (noted as 1.3mm) is the uninstalled thickness or compressed thickness?
If its new, uninstalled then the numbers are off and the compression ratio is actually a slight bit higher then mentioned unless this was done with a VVTI Metal Headgasket and measurements were taken flat to flat not to the raised surfaces.
The stock headgasket thickness, (noted as 1.3mm) is the uninstalled thickness or compressed thickness?
If its new, uninstalled then the numbers are off and the compression ratio is actually a slight bit higher then mentioned unless this was done with a VVTI Metal Headgasket and measurements were taken flat to flat not to the raised surfaces.
ed,
You're 100% right.
I agree fat head gasket belong in the era of flathead engines.
Chompping bits out of the combustion chamber is a recipe for detonation, uneven chamber capacities and even making the chamber roof thin enough to fail.
Given the cost of pulling the heads and grinding them it wouldn't cost any more to use new pistons designed for the correct compression ratio and squish than spend the money machining the heads.
If you get the chamber capacities wrong you'll have some cylinders putting out more power than others. What this means is the good pots are pulling the poor pots along. Not the way to make horsepower.
Horsepower is like Scotch. You can buy cheap scotch and it taste terrible or you buy expensive scotch and it tastes smoothe, cheap horsepower is less horsepower and usually less reliable horsepower.
You're 100% right.
I agree fat head gasket belong in the era of flathead engines.
Chompping bits out of the combustion chamber is a recipe for detonation, uneven chamber capacities and even making the chamber roof thin enough to fail.
Given the cost of pulling the heads and grinding them it wouldn't cost any more to use new pistons designed for the correct compression ratio and squish than spend the money machining the heads.
If you get the chamber capacities wrong you'll have some cylinders putting out more power than others. What this means is the good pots are pulling the poor pots along. Not the way to make horsepower.
Horsepower is like Scotch. You can buy cheap scotch and it taste terrible or you buy expensive scotch and it tastes smoothe, cheap horsepower is less horsepower and usually less reliable horsepower.
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ed_ma61
Guest
a tornado?
please dont tell me youre referring to one of those retarded 'swirl introducers' ???
please dont tell me youre referring to one of those retarded 'swirl introducers' ???
Anaema,
You can buy cheap headers or quality headers. Simple crap headers won't give you the power of well designed and built one. No question!
Even you would agree a mandrell bent system is better than a press bent system. That is if you know the difference.
Personally I'm not a fan of the Tornado. I prefer the Cyclone as it is claimed to give over twice the gain of the Tornado. Mainly because of the ibrilium coating on the outside. It is said to improve air flow by over 600% and triple the ram effect of it's counter-rotating fan blades which were designed by NASA. Of course it costs a little more but it's worth paying more for the gains these little devices can give.
Now work out which of the above 3 Parragraphs isn't true.
You can buy cheap headers or quality headers. Simple crap headers won't give you the power of well designed and built one. No question!
Even you would agree a mandrell bent system is better than a press bent system. That is if you know the difference.
Personally I'm not a fan of the Tornado. I prefer the Cyclone as it is claimed to give over twice the gain of the Tornado. Mainly because of the ibrilium coating on the outside. It is said to improve air flow by over 600% and triple the ram effect of it's counter-rotating fan blades which were designed by NASA. Of course it costs a little more but it's worth paying more for the gains these little devices can give.
Now work out which of the above 3 Parragraphs isn't true.
