#91
|
||||
|
||||
Quote:
__________________
CUSTOM WHEEL & TIRE PACKAGES $125 LED TRAILER LIGHT PACKAGE - FREE SHIPPING REBUILDING HOLLEY MARINE CARBS - $289 DELIVERED REBUILT COMPLETE MARINE HOLLEY 4160 CARBS FOR 302, 351 & 454 STARTING AT $450 DELIVERED Email - [email protected] |
#92
|
||||
|
||||
Pic was before it was moved. Ok, because when we moved it to WOT they would open 2/3 of the way. So you're saying that vacuum opens them the last 1/3?
|
#93
|
|||
|
|||
Secondary Opening
mxhideout: Not a carb. expert, but my understanding is that they are 100% vacuum operated, on our vintage engines at least. Just so were communicating correctly, the rear two barrels are the secondaries, the front two are the primaries. The primaries open by the throttle lever via throttle cable connected to the carb. The secondaries open by vacuum when the engines develops enough low pressure at speed/load, somewhere above 3000 rpm or so (seen several opinions on when).
thatsmrmastercraft: Understood, mine are working now. I was just looking for some of that 'free horsepower' he mentioned!
__________________
1988 Tristar 190 Sport, 351W w/GT-40's, 1:1 Velvetdrive |
#94
|
||||
|
||||
Yes, we were looking at the secondaries (rear). I have more experience with bike stuff, but my dad is the full-time mechanic. If you want more free HP, just add more stickers!
|
#95
|
|||
|
|||
Secondaries are only operated by the vacuum, no mechanical action on this setup. However, if you are able to develop more throttle/rpm by moving the throttle cable connection point, and a consequently a higher vacuum, then they would open more/wider. There are also several different springs that can be used within the secondary vacuum assembly to alter when they start opening.
__________________
1988 Tristar 190 Sport, 351W w/GT-40's, 1:1 Velvetdrive |
#96
|
||||
|
||||
OK, lets start from scratch on carb operation in our boats. The throttle lever causes the primary throttle blades to open and go fast. When approaching 3/4 throttle, the secondaries will open due to the secondary spring overcoming decreasing manifold vacuum. Location of the throttle linkage will not affect secondary operation.......only primary operation. Secondaries open strictly by vacuum.
And stickers do indeed ad horsepower. It has been proven on the dyno. Good Holley carb operation info http://www.holley.com/data/TechServi...ech%20Info.pdf
__________________
CUSTOM WHEEL & TIRE PACKAGES $125 LED TRAILER LIGHT PACKAGE - FREE SHIPPING REBUILDING HOLLEY MARINE CARBS - $289 DELIVERED REBUILT COMPLETE MARINE HOLLEY 4160 CARBS FOR 302, 351 & 454 STARTING AT $450 DELIVERED Email - [email protected] |
#97
|
||||
|
||||
More stickers... my ears perked up...
![]()
__________________
![]() |
#98
|
||||
|
||||
__________________
CUSTOM WHEEL & TIRE PACKAGES $125 LED TRAILER LIGHT PACKAGE - FREE SHIPPING REBUILDING HOLLEY MARINE CARBS - $289 DELIVERED REBUILT COMPLETE MARINE HOLLEY 4160 CARBS FOR 302, 351 & 454 STARTING AT $450 DELIVERED Email - [email protected] |
#99
|
||||
|
||||
Gotcha, thanks.
|
#100
|
|||
|
|||
Quote:
Certainly not a carb expert, but I do like to drive the boat fast! I've learned a tremendous amount on TT, and continue to, as I read it almost daily. Thanks for keeping us straight. Sorry, can't put stickers on the boat. Heck, I've not been able to drill any holes in it yet.
__________________
1988 Tristar 190 Sport, 351W w/GT-40's, 1:1 Velvetdrive |
![]() |
Tags |
1991 ps 190, mastercraft, prostar 190 |
Thread Tools | |
Display Modes | |
|
|