Hmmm....DOHC VS Pushrod...

[Guest]

Wow, more infighting here than at a redneck-hick dinner table...
anyways, yes the dohc has more rotating mass,but, very little reciprocating(sp) mass compared to the pushrod

Last time I checked reciprocating mass was about equal in each design, unless you are also using pushrods and rockers as "reciprocating mass", at which point I'm still confused as to why this makes any difference. *shrug*

The reason I'm confused why pushrods and rockers would make any differtnce is the fact that while a cam turns (I'm talking pushrod here) there are at least one valve opening and one valve closing, so the power to turn the cam is almost nulified by teh recumbant properties of the valve spring acting on the rocker, pushrod and lifter to "push" the cam ...

[SappySE107]

Deflection perhaps? Frictional losses from the pushrod guides and ball fulcrum (gen 2). Gen 3 roller lifters, roller fulcrum, and fixed rocker arm position in theory should free up a few ponies alone. You also have the weight of the rocker off balance from valve to pushrod.

[GPXSS]

wtf is with that site? there is actually a forum dedicated to trashing fiero.nl?


wow.. and I thought people here were passionate 3800 h8r's...

[RacerX11]

It is a site created by the trolls who were banned from fiero.nl

Marty

[Guest]

It is a site created by the trolls who were banned from fiero.nl

Marty

And a good one at that.

[Rhedalert]

Scotch scotch scotch scotch

[donk_316]

Yah it is, and they take 5min to fix so that the DOHC fits. It is the least of the worries for the swap.

Hardly a 5 min fix. First hack the <driver side?> decklid mount half off and eliminate the torsion bars then fab up a "shock" to keep the decklid open. Then cut off the car side of the dogbone mount.

You can hack your plain jane fiero all you want.

[donk_316]

Ok, back on topic. I read the linked thread....omg.

"My biggest point is....for the increase in wieght (especially at the top of the motor) and relatively weak block i still dont see the 'DOHC advantage' not to mention having to cut the deck hinges and so on."

Weak block? Off the crack pipe, its a reinforced block with the lifter area filled in. Thats stronger than the gen 2 block by far, and at least on par with gen 3 if not stronger because of the lifter area. .

Nothing to do with smoking crack brother, id take a 4 bolt bottom end over a "re-inforced lifter valley" any day.

[SappySE107]

Where are you talking about 4 bolt mains? All I read was 3100/3400 pushrods vs the DOHC.

[bszopi]

Well, you could kind of consider the 3x00 bottom end 4-bolt mains with the cross-drilled bolts going into the side of the oil pan.