Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here.

          
Reply
 
Thread Tools Display Modes
  #1  
Old 02-26-2022, 06:29 PM
ScottP's Avatar
ScottP ScottP is offline
Senior Member
 
Join Date: May 2007
Location: Tewksbury, MA
Posts: 110
Default Vortech boosted '70 Bonneville convertible

A bunch of years back, I fuel injected my 70 Bonneville and swapped in a 4L80E. I've been tweaking the combination and getting it dialed in over the past few seasons, and am finally ready to make another big change.

To that end, I ordered up a Vortech V7 YSi and all of the needed brackets and hardware from Mark at Luhn Performance. I spent last weekend starting the mock-up, and thus far it all fits great! I can't say enough good things about the work that Luhn does.

One of my tasks will be to address the oil return on the blower. I'm leaning heavily towards reworking the passenger side of the timing cover to keep the return plumbing short and clean. Has anyone else here used this approach and would like to comment on it, or share pics of their work?

Anyone have any other approaches they have used and are willing to suggest?

I've attached a few pics of where things stand today. I'll add more as I make progress over the coming weeks.

-Scott
Attached Thumbnails
Click image for larger version

Name:	IMG_0839.jpg
Views:	228
Size:	87.1 KB
ID:	584982   Click image for larger version

Name:	IMG_0840.jpg
Views:	193
Size:	77.7 KB
ID:	584983  

__________________
70 Bonneville convertible, EFI455 + 4L80E
  #2  
Old 02-26-2022, 07:48 PM
Scott65's Avatar
Scott65 Scott65 is online now
Ultimate Warrior
 
Join Date: Jan 2002
Location: Houston, Texas
Posts: 1,680
Default

Way cool! Do you have boost level in mind? Or are you gonna find the limit as you go? Keep us updated.

__________________
'65 Tempest 467 3650# 11.30@120.31
  #3  
Old 02-26-2022, 08:00 PM
ID67goat's Avatar
ID67goat ID67goat is offline
Senior Chief
 
Join Date: Nov 2007
Posts: 332
Default

I think a lot of people just drill and tap the timing cover for an AN fitting for the oil drain back.

Really cool project, keep the updates coming!

  #4  
Old 02-26-2022, 08:07 PM
firechicken's Avatar
firechicken firechicken is offline
Ultimate Warrior
 
Join Date: Jan 2001
Location: BC Canada
Posts: 1,602
Default

Many years ago I added a turbo oil drain to the passenger side of the timing cover and redirected the lower rad hose as well to clear it.

Drilling and tapping would probably be simpler.
Attached Thumbnails
Click image for larger version

Name:	timing_cover_mod1.jpg
Views:	124
Size:	213.9 KB
ID:	584992   Click image for larger version

Name:	drain_tube1.jpg
Views:	137
Size:	277.6 KB
ID:	584993   Click image for larger version

Name:	drain_tube2.jpg
Views:	128
Size:	268.2 KB
ID:	584994  

  #5  
Old 02-27-2022, 09:55 AM
ScottP's Avatar
ScottP ScottP is offline
Senior Member
 
Join Date: May 2007
Location: Tewksbury, MA
Posts: 110
Default

My plan is to keep the boost levels modest to start - I'm thinking in the 7-8 PSI range initially. From there I'll assess the fuel system, get the boost regions of the
spark and fuel tables dialed in, and just generally see how it drives.

For the oil return, I'm envisioning something like what firechicken shows, except keep the lower radiator hose as-is, and have the oil return come in at an angle. I'm still noodling over how I want to do that. Tapping the side of the timing cover and adapting to an AN fitting is where I'm leaning at the moment using something like this:

https://www.jegs.com/i/JEGS+Performa...SABEgKnU_D_BwE

-Scott

__________________
70 Bonneville convertible, EFI455 + 4L80E
  #6  
Old 04-23-2022, 08:44 PM
Tom Vaught's Avatar
Tom Vaught Tom Vaught is offline
Boost Engineer
 
Join Date: Dec 2001
Location: The United States of America
Posts: 30,312
Default

Just remember the oil drain line/hose must ALWAYS be GOING DOWNWARD.

No "U"s in the drain line.

Tom V.

__________________
"Engineers do stuff for reasons" Tom Vaught

Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
  #7  
Old 04-25-2022, 11:15 AM
JC455 JC455 is offline
Ultimate Warrior
 
Join Date: Dec 1999
Location: Fresno,Ca USA
Posts: 2,001
Default

My experience with Jeg's AN stuff- use a name brand. I bought a bunch of fittings from them and ended up replacing all of them with Earl's piece.
The fit and finish was too poor for me to trust the parts. When I mocked up the Earl's, things just glided together smoothly... kinda like using generic carb studs vs. ARP.

__________________
John
IG: @crawdaddycustoms
YouTube: https://www.youtube.com/channel/UCK9...Nc_lk1Q/videos
  #8  
Old 04-29-2022, 05:57 PM
ScottP's Avatar
ScottP ScottP is offline
Senior Member
 
Join Date: May 2007
Location: Tewksbury, MA
Posts: 110
Default

100% agreed on the line routing Tom - care will be taken to ensure that it is a continuous slope downward from the blower oil drain to the side of the timing cover.

I would be interested in hearing thoughts on the sizing of this line. At the moment, I have the parts to do this in both 3/8" stainless tube, as well as 1/2". I'm leaning towards the 3/8" just for ease of routing and bending.

__________________
70 Bonneville convertible, EFI455 + 4L80E
  #9  
Old 04-29-2022, 06:58 PM
Tom Vaught's Avatar
Tom Vaught Tom Vaught is offline
Boost Engineer
 
Join Date: Dec 2001
Location: The United States of America
Posts: 30,312
Default

Just a thought for you to consider.

The oil/foam coming out of the Vortech Supercharger can, at times, restrict oil from FROM the supercharger with too small of a return line diameter.

The bubbles created by the oil and gears inside the supercharger drive unit will almost always break and the oil will flow with the larger diameter return line.

When I did Belt driven Vortech and Paxton supercharger testing at my job, we always ran the larger rubber hose vs the smaller 3/8" hose because of the wall friction.

Now if you were running a aluminum or steel tube the walls are much smoother and the bubbles ability to block the drain of oil is greatly reduced. We ran the minimum of rubber hose at the two locations, out of the supercharger nipple and into the oil pan nipple.

Just something to think about.

Some "self contained oil" superchargers can get very hot in the oil/gear case.

Tom V.

__________________
"Engineers do stuff for reasons" Tom Vaught

Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
  #10  
Old 04-30-2022, 10:08 PM
charlie66's Avatar
charlie66 charlie66 is offline
Ultimate Warrior
 
Join Date: Dec 2004
Posts: 3,094
Default

I wouldn't run anything smaller the a 10 line ..

__________________
My Half AN Injun.....
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

Forum Jump


All times are GMT -4. The time now is 03:47 PM.

 

About Us

The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.

 




Copyright © 2017