vortec conversion issues - Corvette Forum : DigitalCorvettes.com Corvette Forums
 
 
Go Back   Corvette Forum : DigitalCorvettes.com Corvette Forums > C3 Corvette Forums > C3 Corvette
Register Forums Garage Garage Mark Forums Read Auto EscrowInsurance

Notices

C3 Corvette
C3 Corvette General | Technical | Performance | Aftermarket | Discussions

Other sections:
Corvettes Classifieds
Corvette Detailing & Car Care
Corvette Audio/Video/Radar
General Automotive/Shop/Tools
Corvette Performance Driving/Racing

( Sponsored by: Zip Corvette Parts )

Shops/Tuners
Custom Image Corvettes
A&A Corvette
Corvette tuner

Interior
Corvette aftermarket products

Insurance

Parts & Products
Race Ramps
Edelbrock
ATI/Procharger
Corvetteguys.com
Melrose Motorsports
Parts Taxi
Airaid
Mid America Motorworks
Pfadt Racing
Madvette Motorsports
Hi-tech Custom Concepts
Corvette aftermarket products
Corvette Garage
Corvette Parts and Accessories
Corvette Car Care Products
Corvette HID
Mid America Motoroworks

Tracks/Schools
Bob Bondurant School of High Performance Driving
Corvette driving school

Wheels/Tires
Cray Wheels

Services
BADWERKS.com
Reply
 
Thread Tools
Old 11-13-2012, 08:20 AM   #1
graphicjunki
DC Crew
 
graphicjunki's Avatar
 
Posts: 481
Member #118654
Member since: Apr 2012
Location: CO, USA!

My Corvette(s)
75 Stingray

Thanks: 16
Thanked 16 Times in 16 Posts
Garage
vortec conversion issues

I've got my engine back in, but I'm running into some small set backs.

First off, I got a high performance Edelbrock mechanical fuel pump. The OEM fuel pump has three ports. One large, one small/medium, and a smaller one. The new fuel pump only has two, IN and OUT. I know which one the OUT is on the OEM... But what about the other two? I thought maybe they sent me the wrong part number, so I went and I double checked. It's correct. I have the service manual, I have the service manual supplement...all that and it only shows the factory config, but only talks about the line that goes from the pump to the carb. The fuel tank section only discusses the Tank and it's connectors, but not the fuel lines.
The instructions that came with the fuel pump only talked about torque specs and trouble shooting.

So on the factory lines, is the smallest line like a breather? Not being fuel injected, I can't imagine it would be a complete return system.


another thing is that I don't even remember taking out the water temp sensor. Too much beer?! But for some reason I would swear it goes on the intake manifold. But the new manifold (Edelbrock 2116) doesn't have the same number of ports on top for 'things' to attach. I don't have a spot for my temp sensor. The engine has the type of thermostat housing that has a threaded hole. I replaced that with a new one identical and mounted it before realizing that I have no idea what the gated vacuum port on top was used for, nor was it attached to anything when I pulled the engine. So I was going to put the sensor in there. But I'm apprehensive about that for some reason. Maybe because part of me believes that the temperature there could fluctuate too much dependent on the state of the thermostat.
Thoughts?

And lastly (for now) is that when I put the carb back on (Rochester Qjet), I put the new gasket down and went to bolt it all down. The bolts are too long. I remember the old gasket feeling fatter, but chalked it up to all the crap that was soaked into it. Figured it was swollen. Is there some kind of spacer? I did see spacers on summit's site, but they were listed as performance and I didn't want to mess with height clearances. But there is also a vacuum port between the carb and the distributor that the carb won't clear now. Grrrr......

Any advice, suggestions.... would be greatly appreciated.
Thanks!
graphicjunki is offline   Reply w/quote Quick reply to this message
WillyB - 1975
L48 Bore'd and cam'd 355 - vortec - Dougs headers and side pipes - 200R4 - e-fan - quicksilver

**Coming!**
Spirals
TPI/SC 406

http://photobucket.com/Willys75Stingray
Sponsored Links
Advertisement
 
Old 11-13-2012, 11:32 AM   #2
slofut
DC Crew
 
slofut's Avatar
 
Posts: 535
Member #119762
Member since: Sep 2012
Location: Home of grits and gnats, Moultrie, Ga.

My Corvette(s)
1971 base conv

Thanks: 90
Thanked 24 Times in 23 Posts
Garage
Quote:
Originally Posted by graphicjunki View Post
I've got my engine back in, but I'm running into some small set backs.

First off, I got a high performance Edelbrock mechanical fuel pump. The OEM fuel pump has three ports. One large, one small/medium, and a smaller one. The new fuel pump only has two, IN and OUT. I know which one the OUT is on the OEM... But what about the other two? I thought maybe they sent me the wrong part number, so I went and I double checked. It's correct. I have the service manual, I have the service manual supplement...all that and it only shows the factory config, but only talks about the line that goes from the pump to the carb. The fuel tank section only discusses the Tank and it's connectors, but not the fuel lines.
The instructions that came with the fuel pump only talked about torque specs and trouble shooting.

So on the factory lines, is the smallest line like a breather? Not being fuel injected, I can't imagine it would be a complete return system.


another thing is that I don't even remember taking out the water temp sensor. Too much beer?! But for some reason I would swear it goes on the intake manifold. But the new manifold (Edelbrock 2116) doesn't have the same number of ports on top for 'things' to attach. I don't have a spot for my temp sensor. The engine has the type of thermostat housing that has a threaded hole. I replaced that with a new one identical and mounted it before realizing that I have no idea what the gated vacuum port on top was used for, nor was it attached to anything when I pulled the engine. So I was going to put the sensor in there. But I'm apprehensive about that for some reason. Maybe because part of me believes that the temperature there could fluctuate too much dependent on the state of the thermostat.
Thoughts?

And lastly (for now) is that when I put the carb back on (Rochester Qjet), I put the new gasket down and went to bolt it all down. The bolts are too long. I remember the old gasket feeling fatter, but chalked it up to all the crap that was soaked into it. Figured it was swollen. Is there some kind of spacer? I did see spacers on summit's site, but they were listed as performance and I didn't want to mess with height clearances. But there is also a vacuum port between the carb and the distributor that the carb won't clear now. Grrrr......

Any advice, suggestions.... would be greatly appreciated.
Thanks!
The '71 I'm working on has three lines to the fuel pump, in/out/return to the tank. It's common. The tank also has a vapor line on the driver side that goes to the vapor cannister in the driver side fender.

Carb spacers are common, there's one on this car, about 3/8 thick.

Hope this helps some,
Bill
slofut is offline   Reply w/quote Quick reply to this message
Old 11-13-2012, 01:50 PM   #3
Enginerd
DC Crew
 
Enginerd's Avatar
 
Posts: 300
Member #118105
Member since: Dec 2011
Location: Virginia

My Corvette(s)
72 coupe

Thanks: 10
Thanked 23 Times in 19 Posts
You can put the temp sensor in the cylinder head instead.
And for the carb gasket you can try using a phenolithic (spelling is probably wrong) spacer. They are designed to prevent heat transfer to the carb, which will be a bonus for you, but the main thing is that the thickness will probably be just right for you; they're usually about 1/4 - 3/8 inch.
Enginerd is offline   Reply w/quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Corvette Forum : DigitalCorvettes.com Corvette Forums forums, you must first register.
Please enter your desired user name (12 CHARACTERS MAXIMUM), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may 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

Powered by vBadvanced CMPS v3.2.2

All times are GMT -6. The time now is 07:59 PM.




Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
2003-2011, DigitalCorvettes.com - All Rights Reserved