is the hemi 2 valve or 4 valve

Discussion of the 426 Street / Strip HEMIs.

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hemi_426
Posts: 4
Joined: Wed Sep 05, 2007 5:29 pm

is the hemi 2 valve or 4 valve

Post by hemi_426 »

i have no clue what it is i thought it is a 4 valve if 2v why not 4?
Nitrous is like a hot chick w/ an STD. You'd hit it but you are afraid of the consequences
392heminut
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Joined: Sat Nov 30, 2002 2:16 pm

Post by 392heminut »

All hemi heads are 2 valve, the hemisperical combustion chamber shape can't be run with 4 valves, the valves would hit each other when they open due to their angle. The 2 intakes would hit each other and the 2 exhaust valves would hit each other. 4 valve heads have each pair of valves parallel to each other so they don't hit when opening. Their chambers are called 'pent roof chambers'.
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Schurkey
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Post by Schurkey »

392heminut wrote: 4 valve heads have each pair of valves parallel to each other so they don't hit when opening.
There's always an exception: Honda Radial Four-Valve chamber as used on the old XR600R (and others) dirt bikes.
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