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Chevy 409 big bore short stroke vs Pontiac 421 Super Duty small bore long stroke shootout. Hmmmm... 80 HP difference?

 
DGN
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04/17/2021 10:40 PM

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Chevy 409 big bore short stroke vs Pontiac 421 Super Duty small bore long stroke shootout. Hmmmm... 80 HP difference?


Last Edited by DGN on 04/17/2021 10:42 PM
Anonymous Coward
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04/17/2021 10:58 PM
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Re: Chevy 409 big bore short stroke vs Pontiac 421 Super Duty small bore long stroke shootout. Hmmmm... 80 HP difference?

 Quoting: DGN





I would imagine the big bore short stroke would offer more low end power. Huge low end torque.

So much depends on the gearing.
Pilgrim001

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05/10/2021 06:55 PM

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Re: Chevy 409 big bore short stroke vs Pontiac 421 Super Duty small bore long stroke shootout. Hmmmm... 80 HP difference?

 Quoting: DGN





I would imagine the big bore short stroke would offer more low end power. Huge low end torque.

So much depends on the gearing.
 Quoting: Anonymous Coward 78505452


Generally (CMIIW) the longer the stroke, the better the torque. Short strokes are good for high revving engines.
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05/10/2021 07:00 PM
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Re: Chevy 409 big bore short stroke vs Pontiac 421 Super Duty small bore long stroke shootout. Hmmmm... 80 HP difference?
Ever see the combustion chambers on the 348/409 engine heads? There aren't any. Deck angles are screwy too. boom33 GM was doing some strange stuff back then, like the GMC 702 V12.

Weird motors.
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05/10/2021 07:29 PM
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Re: Chevy 409 big bore short stroke vs Pontiac 421 Super Duty small bore long stroke shootout. Hmmmm... 80 HP difference?

 Quoting: DGN





I would imagine the big bore short stroke would offer more low end power. Huge low end torque.

So much depends on the gearing.
 Quoting: Anonymous Coward 78505452


Generally (CMIIW) the longer the stroke, the better the torque. Short strokes are good for high revving engines.
 Quoting: Pilgrim001


Quoted for Truth. Its all about piston speed. A short stroke motor has slower piston speeds at the same RPM than a longer stroke motor, thus it can rev higher.

The length of stroke is controlled by the crankshaft. The crank functions as a lever in the power stroke. Longer lever = More torque. Runs out of legs at high rpms tho.

Rod/stroke ratio is important for high reving motors as it is not the piston speed that damages motors(twists cranks) it is the stopping/starting of the piston at TDC and BDC. That is what twists cranks and spins conrod bearings.

A higher reving motor allows for lower gear ratios. This is of utmost importance as any gear ratio lower than 1:1 Multiplies Torque. This is how tiny Honda 4 cyl motors are able to put More Torque to the wheels than the motor produces at the crank.
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05/10/2021 07:33 PM
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Re: Chevy 409 big bore short stroke vs Pontiac 421 Super Duty small bore long stroke shootout. Hmmmm... 80 HP difference?
I always felt a certain spookiness with some Pontiac engines.
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05/10/2021 07:41 PM
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Re: Chevy 409 big bore short stroke vs Pontiac 421 Super Duty small bore long stroke shootout. Hmmmm... 80 HP difference?
I always felt a certain spookiness with some Pontiac engines.
 Quoting: Anonymous Coward 80343809


I have had two Pontiacs, one tried to kill me repeatedly the other one liked to try killing children in crosswalks. NEVER AGAIN.
Anonymous Coward
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05/10/2021 07:43 PM
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Re: Chevy 409 big bore short stroke vs Pontiac 421 Super Duty small bore long stroke shootout. Hmmmm... 80 HP difference?
I always felt a certain spookiness with some Pontiac engines.
 Quoting: Anonymous Coward 80343809


I have had two Pontiacs, one tried to kill me repeatedly the other one liked to try killing children in crosswalks. NEVER AGAIN.
 Quoting: Anonymous Coward 77747215


damned
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05/10/2021 08:01 PM
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Re: Chevy 409 big bore short stroke vs Pontiac 421 Super Duty small bore long stroke shootout. Hmmmm... 80 HP difference?
I always felt a certain spookiness with some Pontiac engines.
 Quoting: Anonymous Coward 80343809


I have had two Pontiacs, one tried to kill me repeatedly the other one liked to try killing children in crosswalks. NEVER AGAIN.
 Quoting: Anonymous Coward 77747215


damned
 Quoting: Anonymous Coward 80343809


No joke. I finally grenaded the engine on the one that tried to kill me, maybe the other one was out for revenge but the second time it tried that crap I drove it to the crusher so I could watch the evil bastard be destroyed beyond salvage.





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