CABIN ENGINE CONTROLS GALORE
Posted 25 March 2015 - 08:39 PM
Great words Jason,
but he doesn't have a V16 with quad turbo's. 
Anyhow, these standard shells start to shake apart at 130 mph.
and 400 k/ph in second gear.
Maybe 184kp/h in second gear, using M21 ratio's. 
http://www.gmh-toran...e-4#entry892474
Edited by NA-PWR, 25 March 2015 - 08:52 PM.
_ljxu1torana_
Posted 25 March 2015 - 11:35 PM
are you racing it around australia dave
use a 3 speed and get more out of the gears
CABIN ENGINE CONTROLS GALORE
Posted 26 March 2015 - 12:05 AM
He he Jason,
be lucky to get 3000km's from a thrashed block. 
are you racing it around australia dave
_ljxu1torana_
Posted 26 March 2015 - 12:31 AM
i know that you can get 80 thou 202 pistons from acl,they are a special order.they have std written on the top of piston.
CABIN ENGINE CONTROLS GALORE
Posted 26 March 2015 - 12:57 AM
Very true,
Just the cylinder walls are getting thinner for high compression,
and wondering the blow-by myself?
i know that you can get 80 thou 202 pistons from acl,
more piston surface area is good though. 
Fulcrum Fixture
Posted 26 March 2015 - 07:36 AM
more piston surface area is good though.
Really?
Why?
_Lazarus_
Posted 26 March 2015 - 09:26 AM
Imagine that the fuel molecules are chickens.
With a small surface area the chickens are crammed in and unhappy, unable to walk around and flap their wings.
But put them on a piston with a large and mountainous surface area and they are free to do some exploring and scratch around to their heart's content, to sing with joy and do some funky little chicken dances.
And we all know that a happy molecule is a productive molecule.
Hope this helps
CABIN ENGINE CONTROLS GALORE
Posted 26 March 2015 - 10:11 AM
Hello TerrA and Mark,
A bigger bore provides more piston area for combustion pressure to work against,
unshroud the valve to promote more efficient breathing,
creates a greater distance for the flame front to travel,
with more surface area to cool the flame.
Really?
Why?
Fulcrum Fixture
Posted 26 March 2015 - 11:39 AM
Maybe.
My line of view is that a larger piston is slower and heavier and more inclined to rock.
Heat is transferred into usable energy, cooling a flame front would slow the combustion process, a good thing I spose if you had too much compression.
The further the flame front would have to travel would mean a longer duration to achieve complete ignition.
FWIW around 30% of heat is transferred into workable compression, pushing the piston down, around 30% is lost into the surrounds, into the cooling and oil system etc and around 30% of heat is lost right out the exhaust.
Fulcrum Fixture
Posted 26 March 2015 - 11:43 AM
I'm not saying an extra few CDI would not be a good thing but is a bigger piston necessarily better than a smaller one?
CABIN ENGINE CONTROLS GALORE
Posted 26 March 2015 - 01:10 PM
At the high-end of racing,
the benefits outweigh the extra friction and weight of piston/rings.
Larges bores are a known thing to do in racing,
as well as increasing cylinder spacing to accommodate them.
Lotsa Posts!
Posted 26 March 2015 - 07:16 PM
A larger piston diameter gives more PSI of combustion pressure to work on,in the "old days" they thought that under square engines with a long stroke was the way to go,but those engines had a very short power curve ,if we do some simple numbers and work out the surface area of the piston and then multiply the combustion pressure over that area we find that an over square engine with a larger piston area equates to a more useable torque curve over a larger range of rpm...or so the story goes... 
hence the 202
_Bomber Watson_
Posted 26 March 2015 - 07:25 PM
THat is assuming you get the same cylinder pressure for the larger bore.....
If your inlet tract/valves/whatever are already maxed out flow wise then wouldnt you get the same amount of air/fuel in a larger area which would = less charge per square inch and less psi? But over a bigger area....
Just thinking through my ass.
Lotsa Posts!
Posted 26 March 2015 - 07:35 PM
If we get the same cylinder pressure on a small bore as we do on a big bore...let's say a 161 compared to a 202 which one will make more power/torque?
_Bomber Watson_
Posted 26 March 2015 - 07:36 PM
That wasnt my point.
Say the inlet tract for the 161 was maxed out, and you bump it up to 202ci........
CABIN ENGINE CONTROLS GALORE
Posted 26 March 2015 - 07:43 PM
I know the 208ci ( 202 +.060 ) with a 100 thou shaved stage5 head gets 101psi ( 250psi ) more than standard 149psi, using a [email protected] Cam.
( this is a dry spark-plug out, compression test )
Would be good to see Compression Test comparisons from other bore sizes. 
Edited by NA-PWR, 26 March 2015 - 07:56 PM.
Lotsa Posts!
Posted 26 March 2015 - 07:56 PM
The bigger piston area would i assume would have a bit more "suck' through the inlet manifold/throat/port resulting in a bit of fast volume air resulting in a bit of a better fill depending on cam etc....swirly air/fuel = turbulence...should imagine the engine will run on the smallest choke available,it might be the valve throat,it might be the valve drop area,it might be the choke in the carb. or it might even be the manifold..dunno
Edited by EunUCh, 26 March 2015 - 07:57 PM.
To advertise here, call 13TORANA
Posted 26 March 2015 - 08:13 PM
"A" squared + "B" squared = "C" squared in some formulations that have worked well for me in the past.
CABIN ENGINE CONTROLS GALORE
Posted 26 March 2015 - 08:26 PM
Good for triangles Rob.
"A" squared + "B" squared = "C" squared in some formulations that have worked well for me in the past.
Another Holden 6 tragic
Posted 26 March 2015 - 08:37 PM
Another Holden 6 tragic
Posted 26 March 2015 - 09:53 PM
_ljxu1torana_
Posted 26 March 2015 - 09:59 PM
so jonsey the difference between 40 thou and 60 thou is a poofteenth too.
Another Holden 6 tragic
Posted 26 March 2015 - 10:10 PM
_Bomber Watson_
Posted 26 March 2015 - 10:18 PM
THe difference in surface area between 60 to 80 is more than 40 to 60.....And 40 to 60 is a bigger difference than 20 to 40, which is a bigger difference than 0 to 20......Not that i'd give a frOck personally, smack her out to the smallest overbore that you can get slugs for....
Cheers.
Another Holden 6 tragic
Posted 26 March 2015 - 10:22 PM
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