Pelican Parts Forums - 3.6 long block rebuild advice please

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- - 3.6 long block rebuild advice please (http://forums.pelicanparts.com/911-engine-rebuilding-forum/1114125-3-6-long-block-rebuild-advice-please.html)

Quote:

Originally Posted by Bill Verburg (Post 11634914)

The main thing that vram does is raise lower rpm torque, the top ends # are quite similar
look at the 2 curves just above the bottom one, these are a 3.6 993 n-vram and a 3.6 993 vram
http://forums.pelicanparts.com/uploa...1646756840.gif

the 996 manifolds are closer in concept to the n vram manifolds as they both just use flaps to alter the resonance characteristics in the manifold by altering the volume and cross sectional area, the 964/993 version only uses 1 flap, the 996 up versions use 2 w/ a larger volume and larger cross sectional area appropriate for larger higher revving engines

the 993 vram has 1 flap like the 964/993 nvram version but also changes the length of the intake runners

Sounds great for a street car. Hate to clobber this guys thread any more - maybe can tie it back to his desires a little. Does the varioram somewhat mitigate the poor OEM gearing for the street by providing that extra torque across the RPM band? It seems like it would.

Quote:

Originally Posted by stanglife (Post 11635047)

both gearing and vram enhance torque available for acceleration but do that in different ways

short gearing enhances torque across the board, shorter tires or shorter cwp all the time and shorter individual gears while they are engaged

vram( length change of the intake tubes) enhances torque in all gears but only in the lower to mid rpm ranges

the variable geometry intake manifolds used in the 964/993/997/991/992 enhance torque somewhat unevenly across the full rev range

I just found out that the pistons are out of the required specs. New pistons are not cheap for these engines. I may have to shelf the intake upgrade for the moment. Is there any harm in using a used O.E intake, TB and twin plug on a rebuilt engine?