Pan E Vac's

Dyno · 12-28-2014, 04:31 PM

Has anyone tried a with and without on the dyno or an A/B at the track to see if it actually is worth anything on a S/S engine. I know there is something with a vacuum pump, but is it worth the hassle to plumb it in a already tight space? Thanks, Dyno

Jim Hanig · 12-28-2014, 07:10 PM

We tried a vac pump on a gt car several years ago did not make one bit of difference. Never tried it on the track.

SSGT Mustang · 12-28-2014, 08:51 PM

It's the ring package/tension that you can run that makes the power, not the vacuum itself. The vacuum allows you to run the trick rings.

In any case, vacuum should help ring seal and reduce blow-by overall, so even pulling a little vacuum from the exhaust flow should be useful, regardless of whether or not there is any immediate power advantage to be seen on the dyno.

Barnstorm · 12-28-2014, 09:05 PM

The blow back under the car is messy but you won't worry about rust.

Tom Meyer · 12-28-2014, 10:31 PM

Back in the day somebody did a lot of work on tube placement, openings and what not. With his car on jack stands he had the hose in a pan water and had it set up so fine it would empty the pan in no time, took it to the track and it was worth nothing. Save it for something else. Been on here before but a pvc system showed something, just remember all that air that we try to get into the top of the engine with trick carbs intakes and cly heads is moving under the piston and the better we control it the better it makes the oil and HP. But you still need a good ring package. Tom

rx dealer · 12-29-2014, 11:04 AM

I was down 9 h/p on the dyno with my 350-255 super stock engine WITH pan evac...in the trash it went...Luke

Dyno · 12-29-2014, 11:48 AM

Quote:

Originally Posted by rx dealer

I was down 9 h/p on the dyno with my 350-255 super stock engine WITH pan evac...in the trash it went...Luke

I know in theory it should be worth something, on my car it shows nothing either way. I need new headers built and I am sorting things out. thanks, Dyno

Jeff Teuton · 12-30-2014, 05:45 PM

We went back to back on the dyno about 3 or 4 years ago. Nothing fancy, just tubes in the collector tied to the valve covers. This was a 440 SS motor, made 6 hp no changes. Made two pulls that were identical. And we just always run them in SS.

nolongerracing · 12-30-2014, 11:33 PM

Did anyone use a vacuum gauge to make sure you were pulling vacuum? It takes time to seal all the leaks and if it's set up right, you can pull nearly 5 inches. It's worth the effort.

GTX5877 · 01-01-2015, 12:15 PM

Have done A-B-A testing on many types of engines, always worth 5+ hp. Connecting vacuum gauge on dyno is very important to affirm gasket sealing. Can pull 5" on a nothing fancy system. Have heard as high as 10" achievable with some work. Smoke machines very helpful, especially on vacuum pump engines to find pesky vacuum leaks. If it has vacuum leaks, it will not create a vacuum. And the obvious...ring package and ring seal always play a big part in the effectiveness.

Tom Hestness

12-28-2014, 04:31 PM	#1
Dyno Senior Member Join Date: Dec 2002 Posts: 916 Likes: 1,139 Liked 685 Times in 204 Posts	Pan E Vac's Has anyone tried a with and without on the dyno or an A/B at the track to see if it actually is worth anything on a S/S engine. I know there is something with a vacuum pump, but is it worth the hassle to plumb it in a already tight space? Thanks, Dyno

12-28-2014, 07:10 PM	#2
Jim Hanig Senior Member Join Date: Aug 2006 Location: Pukwana SD Posts: 860 Likes: 554 Liked 99 Times in 49 Posts	Re: Pan E Vac's We tried a vac pump on a gt car several years ago did not make one bit of difference. Never tried it on the track.

12-28-2014, 08:51 PM	#3
SSGT Mustang Member Join Date: Mar 2005 Location: Jersey Posts: 359 Likes: 35 Liked 204 Times in 54 Posts	Re: Pan E Vac's It's the ring package/tension that you can run that makes the power, not the vacuum itself. The vacuum allows you to run the trick rings. In any case, vacuum should help ring seal and reduce blow-by overall, so even pulling a little vacuum from the exhaust flow should be useful, regardless of whether or not there is any immediate power advantage to be seen on the dyno.

12-28-2014, 09:05 PM	#4
Barnstorm Member Join Date: Dec 2009 Location: Minnesota Posts: 186 Likes: 0 Liked 0 Times in 0 Posts	Re: Pan E Vac's The blow back under the car is messy but you won't worry about rust.

12-28-2014, 10:31 PM	#5
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 936 Likes: 78 Liked 354 Times in 120 Posts	Re: Pan E Vac's Back in the day somebody did a lot of work on tube placement, openings and what not. With his car on jack stands he had the hose in a pan water and had it set up so fine it would empty the pan in no time, took it to the track and it was worth nothing. Save it for something else. Been on here before but a pvc system showed something, just remember all that air that we try to get into the top of the engine with trick carbs intakes and cly heads is moving under the piston and the better we control it the better it makes the oil and HP. But you still need a good ring package. Tom __________________ Tom Meyer 5240 SS Stock ??? Last edited by Tom Meyer; 12-29-2014 at 11:18 PM. Reason: added

12-29-2014, 11:04 AM	#6
rx dealer Member Join Date: Mar 2007 Location: Lake Orion, Michigan Posts: 337 Likes: 12 Liked 53 Times in 13 Posts	Re: Pan E Vac's I was down 9 h/p on the dyno with my 350-255 super stock engine WITH pan evac...in the trash it went...Luke

12-30-2014, 05:45 PM	#8
Jeff Teuton VIP Member Join Date: Jan 2002 Location: Houma, LA Posts: 2,717 Likes: 2 Liked 325 Times in 50 Posts	Re: Pan E Vac's We went back to back on the dyno about 3 or 4 years ago. Nothing fancy, just tubes in the collector tied to the valve covers. This was a 440 SS motor, made 6 hp no changes. Made two pulls that were identical. And we just always run them in SS. __________________ Jeff Teuton 4022 STK

12-30-2014, 11:33 PM	#9
nolongerracing Member Join Date: Oct 2006 Posts: 173 Likes: 2 Liked 72 Times in 27 Posts	Re: Pan E Vac's Did anyone use a vacuum gauge to make sure you were pulling vacuum? It takes time to seal all the leaks and if it's set up right, you can pull nearly 5 inches. It's worth the effort.

01-01-2015, 12:15 PM	#10
GTX5877 Junior Member Join Date: Jun 2005 Location: Albert Lea, MN Posts: 52 Likes: 3 Liked 20 Times in 9 Posts	Re: Pan E Vac's Have done A-B-A testing on many types of engines, always worth 5+ hp. Connecting vacuum gauge on dyno is very important to affirm gasket sealing. Can pull 5" on a nothing fancy system. Have heard as high as 10" achievable with some work. Smoke machines very helpful, especially on vacuum pump engines to find pesky vacuum leaks. If it has vacuum leaks, it will not create a vacuum. And the obvious...ring package and ring seal always play a big part in the effectiveness. Tom Hestness