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I'm kind of new to this, but I was reading Sport Compact Car Mag and they said that the SR20DE motor in earlier Sentra SE-Rs was very strong. On the new motor in the B15, the bottom end is missing the reinforcement girdle on the bearing caps. Does this weaken the motor in any way? Anyone have any comments on this.
 

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older ones had a higher redline, which is an advantage. That can be fixed by a new ECU, but since noone makes one.....

There are probably other differences, but that is the main one.

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SR20DE..Sorry Si guys.
 

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JCC
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The main girdles being removed is a weight savings measure taken by nissan. The skyline gt-r also has that weight measure done to it's engine so I doubt it will degrade the performance ability any.
 

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Here's a little history lesson on the SR20DE. The motor was designed in Japan with the intent that it would be a turbocharged motor. That is where we get the SR20DET. Ibelive this motor powered many Japan Nissan models suck as the Primera and some models of Silvias. They must have discovered the motor did pretty well sucking its own air too(or they designed it that way) so they just yanked off the turbo and they had an SR20DE. Anyway the SR20 was built to handle 200+hp that the turbo would require of it. It came with a forged steel crank and beefy connecting rods and yes, the end cap gurdle. The bottom end is considered bulletproof except in the most extreme cases 350hp+.

Now to the current model of the SR20. The motor went through the most extensive lightening and design changes the motor had ever been through in its 9 year life. The designers must have taken in to account that the American models were not turbos so they removed the gurdle and lightened the motor up a bit. However, the motor still retains a strong forged crank and beefy rods although to a somewhat lesser degree than its predecessor. I personaaly welcome the changes. The motor is lighter and a little more willing to spin. The only people that will miss some of the beef on the bottom end will be those who plan on making extreme power 250hp+.

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rschauby

2001 Sentra SE w/PP auto (radium)
1998 SE-R 5spd
 

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I would guess that a main bearing cap girdle could be taken off a salvage SR20DE motor and installed for those "built" motors running nitrous, turbo, or high compression motors. It wouldn't hurt anything to add a little security in keeping things where they are supposed to be.

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Waiting for PR CAI, got the Stromung, got the Unorthodox, got a big fat empty "0" in my bank...:)
 
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