MC vs. 20vt-weaker bottom end.

[JShadzi at aol.com]

One thing I have learned recently, that I have not ever heard brought up 
regarding using the NG bottom end in a 20vt motor, the NG and MC motors have 
vastly different pistons AND connecting rods.  The NG uses a slimmer, longer 
144mm rod, the MC uses a beefy, shorter 136mm conn rod.  The MC has a lower 
compression height, but is a much taller piston with ring lands twice that of 
the NG piston.  Also, the NG uses a 20mm wrist pin, the MC uses a 22mm.  

So, problem is, building a more powerful motor than the MC using a weaker 
engine.  I am not saying that the NG won't take 300hp, but compared to the 
MC, it will bend rods and melt pistons sooner, a major consideration in going 
the 20v route to get considerably more power than the 10v MC.  Pretty much 
rules out the idea for me, custom pistons required.

Javad
80tq.com

In a message dated 10/15/2001 8:02:10 PM Pacific Daylight Time, 
newt at newtsplace.com writes:

<< With the 10v head they are 10:1, rumor has it that the 20v head drops the 
CR
 a little over 1 point. Making for useable t'bo compression with the stock
 pistons.
 
 -Nate
 '89 90tq
 www.newtsplace.com >>