Holley Vacuum Secondaries - Help
07-15-10, 12:55 AM
#26
Photographic update for you all who are interested...
Bread tie test before the test drive after installing the spacer:
Bread tie test after installing the spacer after the test drive:
Yup! Secondaries are working now!
Spacer installed:
Overall engine shot just for fun:
Attached pictures are as follows: Leading plugs after spacer, trailing plugs before spacer, trailing plugs after spacer.
When I bought it, it had BUR8EQ plugs all around. I was running the BR7EQ leadings with BUR8EQ trailings because the leading BUR7EQ plugs fouled when I was trying to get it tuned after the initial install because it was running so damn rich.
After the secondaries started opening and it wasnt running pig rich anymore, I installed a fresh full set of BR7EQ plugs. If anything, I would say the plugs tell a good story about how much better its running now that it has that spacer...
~T.J.
Bread tie test before the test drive after installing the spacer:
Bread tie test after installing the spacer after the test drive:
Yup! Secondaries are working now!
Spacer installed:
Overall engine shot just for fun:
Attached pictures are as follows: Leading plugs after spacer, trailing plugs before spacer, trailing plugs after spacer.
When I bought it, it had BUR8EQ plugs all around. I was running the BR7EQ leadings with BUR8EQ trailings because the leading BUR7EQ plugs fouled when I was trying to get it tuned after the initial install because it was running so damn rich.
After the secondaries started opening and it wasnt running pig rich anymore, I installed a fresh full set of BR7EQ plugs. If anything, I would say the plugs tell a good story about how much better its running now that it has that spacer...
~T.J.
07-15-10, 03:16 PM
#30
Thanks for giving it! It made sense in my head once you mentioned it, and it was definitely cheaper than a new carb, about $280 cheaper, haha.
Ive got some funny spots to work out driving now, but it definitely runs way better. I will crack it open and look at the jets again and write it all down so I can go get some new ones and toy with it a little.
~T.J.
Ive got some funny spots to work out driving now, but it definitely runs way better. I will crack it open and look at the jets again and write it all down so I can go get some new ones and toy with it a little.
~T.J.
07-18-10, 01:37 AM
#36
My motor is fine, its running great. I havent had time to grab new jets from the shop yet, Ive been busy pulling parts off a local car being parted, plus my girlfriends Moms car needed a tune up, and Ive been busy doing some "spring" cleaning around the shop from the 7s build up. I will try and get out there Monday since I think theyre closed tomorrow (Sunday).
I brought the fuel pressure up 1 PSI to 6 PSI, reset the floats, and that actually seems to have helped with a stumble I had. I will pull the plugs and recheck them since it was looking a little lean during cruise and WOT pulls before at 5 PSI, but either way I think I need some jetting and AP work.
I will update once I get that going. The only other issue is my front left caliper apparently has decided to start sticking. I came up to a stop sign and it was smoking. I have rebuild kits on order but for now Im going to just try and work it free with it off the car, hopefully tomorrow.
~T.J.
07-20-10, 03:19 AM
#43
Yeah, the 4 hole would be the exact same thing as the carb just bolted to the intake. The point is to make an open plenum space where the carb fan feed all 4 intake ports at the same time.
The way the RB setup is mounted to the intake, only two intake ports are pulling in air/fuel from the primaries, the other two go to the secondaries. With the open spacer, it combines all that so all 4 can draw through the primaries, and also the secondaries when they open as well.
PERSONALLY, I think thats a better setup since they can "share" the same intake charge versus possibly feeding one rotor a lean mixture, or one rotor a rich mixture - or whatever. Theyre all getting the same mixture because of the open plenum space the spacer creates. I also think the new found intake velocity/volume from all 4 intake ports pulling a charge in rather than only 2 is what is responsible for my secondaries working now seeing as theyre based on the venturi effect to create vacuum to open them via one of the primary venturis.
~T.J.
The way the RB setup is mounted to the intake, only two intake ports are pulling in air/fuel from the primaries, the other two go to the secondaries. With the open spacer, it combines all that so all 4 can draw through the primaries, and also the secondaries when they open as well.
PERSONALLY, I think thats a better setup since they can "share" the same intake charge versus possibly feeding one rotor a lean mixture, or one rotor a rich mixture - or whatever. Theyre all getting the same mixture because of the open plenum space the spacer creates. I also think the new found intake velocity/volume from all 4 intake ports pulling a charge in rather than only 2 is what is responsible for my secondaries working now seeing as theyre based on the venturi effect to create vacuum to open them via one of the primary venturis.
~T.J.
07-21-10, 01:52 AM
#45
I picked up the number 70 jets today (no cam kit though, they didnt have one in stock), but I havent tinkered with it yet. I got stuck cleaning the shop instead. Turns out there is an appraiser coming Friday so we have to make it look all pretty and clean. I will try and find some time tomorrow to mess with it, but we have to take a load to the dump and metal recyclers as well as straighten things up.
~T.J.
~T.J.
