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 » Wed Jan 02, 2008 6:37 pm

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 » Thu Jan 03, 2008 10:03 am

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'.
Owner of the Poor Man's Hemi Cuda

Schurkey
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Location: Frozen Wastelands

Post by Schurkey » Tue Jan 29, 2008 4:10 pm

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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