360 stock piston volume
- Thread starter berlins
- Start date
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Piston head volume?
As in the top of the piston?(AKA The crown of the piston/top of the piston/amount of cc's the piston dish and or valve reliefs are)
Or the cylinder head? Cylinder head chamber cc volume is approx. 72 cc's. This can vary as much as 4 cc ethier way. 72 is a safe number.
As in the top of the piston?(AKA The crown of the piston/top of the piston/amount of cc's the piston dish and or valve reliefs are)
Or the cylinder head? Cylinder head chamber cc volume is approx. 72 cc's. This can vary as much as 4 cc ethier way. 72 is a safe number.
Pistons - out on Summit Racing all of their KB pistons show a
piston head volume number, was wondering what this number is for
a stock 360 piston. The compression calculator they have says a
negative number is a domed piston, positive is a dished. Seems like
an easy way to raise compression is to just put in a set of pistons
with less of a dish or domes a little. The number for KB pistons goes
from +18cc to -11.2cc.
piston head volume number, was wondering what this number is for
a stock 360 piston. The compression calculator they have says a
negative number is a domed piston, positive is a dished. Seems like
an easy way to raise compression is to just put in a set of pistons
with less of a dish or domes a little. The number for KB pistons goes
from +18cc to -11.2cc.
OK, the stock 360 pistons vary in there amount of cc. There a dished piston. I beileve if you go to the KB web site and look for a stock replacement piston, they have a section for this, you'll find your answer.
What comp. ratio are you looking for? With what heads?
Very often, a popular choice here is the KB-107 Hyper-U slug in a 360. It is a flat top piston with 5 cc valve reliefs. In a 360 with 360 heads, a .039 gasket, the slug will make for an approx. 9.5-1 to a 10-1 ratio. Alot depends on where the piston sits when installed.
At a zero deck height, where the piston is sitting flush and even with the deck, it normaly makes a 9.8-1 ratio with a 72 cc head and .039 thick gasket. Anything slightly thicker, down the hole some or more in head cc will drop the ratio....of course.
What comp. ratio are you looking for? With what heads?
Very often, a popular choice here is the KB-107 Hyper-U slug in a 360. It is a flat top piston with 5 cc valve reliefs. In a 360 with 360 heads, a .039 gasket, the slug will make for an approx. 9.5-1 to a 10-1 ratio. Alot depends on where the piston sits when installed.
At a zero deck height, where the piston is sitting flush and even with the deck, it normaly makes a 9.8-1 ratio with a 72 cc head and .039 thick gasket. Anything slightly thicker, down the hole some or more in head cc will drop the ratio....of course.
moper
Well-Known Member
The factory dish is only around 5cc I think, depending on the year. The problems are not the dish volume, but the lack of compresion height (leaving it way down in the bore) and the lack of valve reliefs if you try to get it close to deck.
mshred
The Green Manalishi
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don't want to resurrect an oldie, but im doing something similar and thought this might help
http://www.summitracing.com/parts/SLP-405P/
says how far down the pistons will be...so given a 5cc dish like moper said, a 62cc head, a thin head gasket (MP composite .024" compressed) and the below the deck clearance of 0.0705, compression should be 9.5:1....almost seems wrong though to get it up that easy
http://www.summitracing.com/parts/SLP-405P/
says how far down the pistons will be...so given a 5cc dish like moper said, a 62cc head, a thin head gasket (MP composite .024" compressed) and the below the deck clearance of 0.0705, compression should be 9.5:1....almost seems wrong though to get it up that easy
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