CLASS RACER FORUM - View Single Post - to vacuum pump, or not to vacuum pump, that is the question?

Jim Scott · 10-04-2007, 08:58 AM

I haven't had any luck with the GM electric smog pumps. I've used both the old Lt/LS1 (395.00) and the new S10 (550.00). They do draw 5-7" of vacuum at idle, but not down track. They worked well as a evac system..(not for power gain).for a while. Less than a season. I've been running them for 3 years but I am going to a belt driven for reliability.

They do make a bad azz electric pump that uses Dewalt 24 volt battery packs...but they are over a grand.The parasitic loss from a belt drive is very small...if your on alcohol or your running low tension rings, it's hard to beat a good belt system.

10-04-2007, 08:58 AM	#6
Jim Scott Junior Member Join Date: Dec 2006 Location: United States Posts: 14 Likes: 0 Liked 0 Times in 0 Posts	Re: to vacuum pump, or not to vacuum pump, that is the question? I haven't had any luck with the GM electric smog pumps. I've used both the old Lt/LS1 (395.00) and the new S10 (550.00). They do draw 5-7" of vacuum at idle, but not down track. They worked well as a evac system..(not for power gain).for a while. Less than a season. I've been running them for 3 years but I am going to a belt driven for reliability. They do make a bad azz electric pump that uses Dewalt 24 volt battery packs...but they are over a grand.The parasitic loss from a belt drive is very small...if your on alcohol or your running low tension rings, it's hard to beat a good belt system. __________________ Jim Scott 702V ET/SG/Sst Bigjimzlll