Crankcase vacuum - Hemi Truck Club
 
Go Back   Hemi Truck Club > HEMI | Performance Zone > Engine | Modifications, Repairs and Performance

Reply
 
Thread Tools Display Modes
 
Old 04-23-2019, 09:01 AM   #1
Greg
 
Redtruck-VA's Avatar
 
Join Date: Jan 2011
Location: Virginia
Posts: 19,026
Garage
Crankcase vacuum

Was talking to an engine builder about methods of pulling a vacuum on the crankcase. I had always heard it was beneficial as it promoted ring sealing. Using scavenger tubes in the collectors seemed the simplest method. He warned me that it might not be such a good idea as whatever vacuum is pulled, directly reduces oil pressure. General line of thought is 10psi per 1000 rpm. So 7000 rpm should be around 70psi. If your scavenger system is working well and say is pulling 30psi or more.... you could be spinning the engine 7000rpm with less than 40psi of oil pressure....

__________________
2003 RCSB, 2wd, "Pro-Street"
6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
Redtruck-VA is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-23-2019, 10:36 PM   #2
2012 Truck of the Year
Engine Specialist
 
charged392's Avatar
 
Join Date: May 2011
Location: Fort pierce, FL
Posts: 17,240
Garage
No way will an exhaust scavenger pull that much vacuum. Mine will remove about 6-8psi of crankcase pressure leaving me actually at 0-1psi range and no actual vacuum so I think my oil pressure is fine.
__________________
"CMR TUNER" [email protected] 1/4 with a 7.32 1/8 custom long/short bars by "Me" Turbocharged 392 on 9psi S475/96/1.32 . Running thru an A518! [email protected]
charged392 is offline   Reply With Quote
Old 04-24-2019, 03:08 AM   #3
Stu
 
Join Date: Oct 2009
Location: FL
Posts: 20,374
Garage



Ghost03hemi is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 04-24-2019, 05:37 AM   #5
Greg
 
Redtruck-VA's Avatar
 
Join Date: Jan 2011
Location: Virginia
Posts: 19,026
Garage
Interesting, never really gave it a lot of thought. But it did pickup some horsepower.
__________________
2003 RCSB, 2wd, "Pro-Street"
6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
Redtruck-VA is offline   Reply With Quote
Old 04-24-2019, 08:24 PM   #6
2012 Truck of the Year
Engine Specialist
 
charged392's Avatar
 
Join Date: May 2011
Location: Fort pierce, FL
Posts: 17,240
Garage
I gained a good bit from it on mine and it’s a simple scavenger setup in the exhaust.
__________________
"CMR TUNER" [email protected] 1/4 with a 7.32 1/8 custom long/short bars by "Me" Turbocharged 392 on 9psi S475/96/1.32 . Running thru an A518! [email protected]
charged392 is offline   Reply With Quote
Old 04-24-2019, 08:33 PM   #7
Greg
 
Redtruck-VA's Avatar
 
Join Date: Jan 2011
Location: Virginia
Posts: 19,026
Garage
Quote:
Originally Posted by charged392 View Post
I gained a good bit from it on mine and itís a simple scavenger setup in the exhaust.
Yeah, I have a pair of those aluminum valve covers I bought awhile back i want to modify and set up a evac system.
__________________
2003 RCSB, 2wd, "Pro-Street"
6.4L/cog driven V7-Ysi/46rh trans/HTH Truckarm coilover suspension. HP Tuning...

1# 2017 HTC FASTEST HEMI List....
Current 1/4 mile [email protected] (2018)
Current 60' PB 1.351 (2019) mechanical issue for 1/4m

HTC 2018 TOTY

Support vehicle- 2007 QC G56 4x4 diesel
Redtruck-VA is offline   Reply With Quote
Old 04-25-2019, 08:07 AM   #8
Mark G Senior Member
 
bada44's Avatar
 
Join Date: Jul 2006
Location: St Augustine FL
Posts: 1,634
Garage
https://rover.ebay.com/rover/0/0/0?m...2F263064053711

https://rover.ebay.com/rover/0/0/0?m...2F112082909639
__________________
Every 2 minutes a new child is diagnosed with cancer & 1 in 5 children diagnosed with cancer will not survive!
Please Donate today!
https://www.stbaldricks.org
I stand for the flag!

Engine built by Go For Broke performance
[email protected]
bada44 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Premium Vendor Showcase
n2 Speed Edge InTune Edge OCPerformance Parts

All times are GMT -6. The time now is 12:20 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.