EMC 2017 353ci SBC

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Post Reply
randy331
Guru
Guru
Posts: 2696
Joined: Mon Dec 04, 2006 7:30 pm
Location: N.W. MO.

Re: EMC 2017 353ci SBC

Post by randy331 » Thu Jan 18, 2018 7:17 pm

CGT wrote:
Thu Jan 18, 2018 10:06 am
MadBill wrote:
Thu Jan 18, 2018 9:04 am
Big Joe reported up to a 50 HP gain with pan vacuum on an big BBC with rings optimized for it. I've several times seen +12-15 on ~ 450 HP 6500 RPM SBCs with typical circle track ring packages.
It's always fun to me to try vacuum on the dyno. The results are sometimes really inconsistent. There is one particular motor (Randy knows about) that has an allergy to vacuum. :lol: . It should really respond to it in theory, but is hard headed and doesn't. It tends to pick up the same amount of power that it takes to spin the vacuum pump :lol:
Yea, I'd like to know what's going on with that engine for sure.
It's been tried 3, maybe 4 times on it, belt on nothing, belt off nothing, and one time with small oil pan, still nothing.
Tommy Boy picked up 15 HP with the same pump on it and similar vacuum. (15"-16")
Be interesting to raise oil pressure on it and see if vacuum still had the same results.

Guess if I figure it out I can repeat it on others and save money on vacuum pumps. :)

Randy

gmrocket
Expert
Expert
Posts: 789
Joined: Wed Nov 12, 2008 6:40 pm
Location: Grimsby Ontario

Re: EMC 2017 353ci SBC

Post by gmrocket » Thu Jan 18, 2018 7:24 pm

Short stroke motor?

randy331
Guru
Guru
Posts: 2696
Joined: Mon Dec 04, 2006 7:30 pm
Location: N.W. MO.

Re: EMC 2017 353ci SBC

Post by randy331 » Thu Jan 18, 2018 8:25 pm

gmrocket wrote:
Thu Jan 18, 2018 7:24 pm
Short stroke motor?
4.031 x 3.75" stroke

Randy

Post Reply