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Custom Dodge Ram Performance Mods - Engine - 5.2 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!


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  #11  
Old 09-19-2013, 10:16 PM
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Im sorry guys I guess I really should have just searched for it. I browsed through the mods page and didnt see one so I just posted a new one. Thank you guys for your help. Next time Ill search it and then post if need be.
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Old 09-19-2013, 10:19 PM
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Great reply.

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  #13  
Old 11-24-2013, 03:33 PM
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OK Im not attempting to continue flogging the poor old horse, but please someone correct me if my logic is misguided in relation to throttle spacers.
Guys go to great lengths to mod their kegger intakes, trimming the intake runners back for better flow and or torque numbers...some as little as 1.5inches, others al the way back in the case of the 5.9, then you pop on a throttle body spacer thatin effect adds 3/4 inch to the over all runner length? It seems to my limited mind that youd be chasing your tail.
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Old 11-28-2013, 11:17 AM
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Not exactly. Runner length is not changed by adding a spacer. The spacer will, in fact, increase common plenum volume. The runners then draw from the common plenum. The whole point of spacers came about to help carbureted engines breather better. An increase in plenum volume will improve runner flow in restrictive intake to a point. Primarily, spacers were good for raising the carburetor. Air is pretty compliant at going around corners, but the sharper the corners, and the more switchbacks, and as velocity increases, the more turbulence you get, and more importantly, in carbureted engines, the more fuel dropout you get as a result of that turbulence. When the gas drops out of suspension, it pools in the intake, which kinda defeats the purpose. Multi-point injection eliminates the "wet" intake, so fuel dropout isn't an issue. You can still improve airflow (one only need look no further than the Hughes/Edelbrock Performer AirGap for MPI to see that) to improve performance. That's a dual plane intake, by the way, with the common plenum divided in two. This shows how much MORE important the free-flowing port runners are than total plenum volume is (relatively speaking), especially in an MPI engine. Trimming runner length will move the power band around. Trimming runners effectively increases plenum volume, which increases the available air each runner can draw from. Adding a spacer for a microscopic increase in plenum volume on an MPI engine is a total waste. All runners are already drawing from a full size single plenum. Concentrating on improved runner flow is huge by comparison. Again, the example of the aftermarket intake dramatically out-performing the stocker, or even a highly modified kegger while employing two smaller plenums cannot be overstated. The dual plane Performer's runners are dramatically more efficient and easily outflow the single plane-fed kegger's runners. Hence, adding a spacer is useless on an MPI. You already have all the volume even a modified kegger can use.

Last edited by Gen1dak; 11-28-2013 at 11:19 AM.
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