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vacuum pump speed
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DRR Trophy
posted
Anyone increase the speed of their moroso original style 4 vane vacuum pump? Max engine rpm 7500.

currently running a 2.5" on the mandrel and 5" on the pump. That puts the pump at 3750rpm

Moroso has conflicting instructions that say max rpm of 6000 and 6500 rpm

Only other pulley moroso sells is a 4" That would put the pump at 6000rpm

Fighting weak vacuum. recently rebuilt, cleaned, engine smoked checked. Been this way since new

This message has been edited. Last edited by: Nitrous1,
 
Posts: 75 | Location: nitrousville | Registered: January 30, 2012Reply With QuoteReport This Post
DRR Pro
Picture of rusty
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run the engine with the suction unconected from engine,look for pulses from connector


honesty is the best policy,insanity is a better deffense
1.036, 6.16@ 224

 
Posts: 1396 | Location: texas | Registered: February 17, 2006Reply With QuoteReport This Post
DRR Sportsman
Picture of 329L
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My 4 vane, enhanced version acted same way with 2.5 pulley, would only pull 5-6". Put a 4" on it and would go to 15". I have been running it that way for 4 years, and have had 0 issues whatsoever.


Jeremiah Hall
 
Posts: 704 | Location: Evansville, IN | Registered: February 24, 2010Reply With QuoteReport This Post
DRR Sportsman
Picture of TD3550
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Same here.. "Enhanced" 4 vein. 4" on the bottom no problem... 14.5" Seen it too many times wrong lower and the pump will collect more junk quicker.
 
Posts: 1409 | Location: Under a Truck | Registered: August 23, 2013Reply With QuoteReport This Post
DRR Sportsman
Picture of Bad News
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More to it than just the pump speed that everybody neglects.
Manifold bolts that are through into the valley, they leak like a sieve. Teflon thread sealer
Poor silicone job on the manifold to china rails.
Poor sealing valvecovers.
Distributor seal leaking.
Poor hone job/ rings not seating. (leakdown)
 
Posts: 868 | Location: ft laud | Registered: September 02, 2004Reply With QuoteReport This Post
DRR Sportsman
Picture of Bad News
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quote:
Originally posted by Bad News:
More to it than just the pump speed that everybody neglects.
Manifold bolts that are through into the valley, they leak like a sieve. Teflon thread sealer
Poor silicone job on the manifold to china rails.
Poor sealing valvecovers.
Distributor seal leaking.
I run the 5 inch pump pulley and the 3 inch crank pulley, 2 inches at idle and 14-15 @7000
Poor hone job/ rings not seating. (leakdown)
 
Posts: 868 | Location: ft laud | Registered: September 02, 2004Reply With QuoteReport This Post
DRR S/Pro
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80% of engine


J.R. Baxter

""Fathom the hypocrisy of a Government that requires every citizen to prove they are insured ..but not everyone must prove they are a citizen."

2024 Miller
Rolla Competition Engines
ProCharger
Hoosier Tires
Abruzzi
 
Posts: 1515 | Location: Waxahachie | Registered: July 04, 2005Reply With QuoteReport This Post



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