12 volt air pump on Opti Spark ?
Hello to all. I have a 1993 LT1 , One quick question , Has anybody used a 12 volt air pump to pressurize the opti spark ? this way it gets fresh air and keeps all contaminates out . Positive pressure hose to the Opti and Vacuum hose side from the Air filter case. Just have to find a live 12 volt after the switch. ( any suggestions ? ) Thanks Here is a link to the pump i might try. https://www.ebay.com/i/163050831142?chn=ps
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I haven't tried to put a gen 2 cap on a gen 1 opti. I saw someone modified a gen 1 cap by drilling vent holes and connecting it like a gen 2. After cap is vented I don't know there will be an advantage to the air pump.
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The gen 2 vented work just like an air pump using engine vacuum. Gen 1 can be modified and should be. Dan
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Originally Posted by Whaleman
(Post 1597959178)
The gen 2 vented work just like an air pump using engine vacuum. Gen 1 can be modified and should be. Dan
Live well, SJW |
So will go with the 2nd gen. vac design. I guess just make sure to seal the distributor vac tight. I drive everyday rain, sun, snow , bring it on . Thanks
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Be aware that you can't bolt a Gen 2 unit onto your engine. The camshaft drive coupling arrangement is different. You can, however, add the Gen 2 active venting to your Gen 1 distributor. Search the archives here for posts about how that's done.
Live well, SJW |
Petris makes a modified spline Opti with all the accessories to install it. It uses the break booster vacuume port off the intake and a port aft of the MAF. I would not use a pump. |
I rebuilt my Opti spark and installed the Vac system , WoW what a difference . much nicer on slow pedal control. The main Question to this post was has anyone done the positive pressure on the Opti. and the Answer is nobody has . Thanks Y'all back to the Shadows i go.
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https://www.corvetteforum.com/forums...tallation.html
Check out this thread concerned with vacuum checking your optispark for air leaks. |
Originally Posted by Oldtires
(Post 1597996364)
I rebuilt my Opti spark and installed the Vac system , WoW what a difference . much nicer on slow pedal control. The main Question to this post was has anyone done the positive pressure on the Opti. and the Answer is nobody has . Thanks Y'all back to the Shadows i go.
But I have met a former LT1/opti owner that used a small CO2 cartridge on his Opti. Said it worked great for him but I don't see how a small cartridge could last very long. Well as far as that goes any positive pressure system would be an experiment as air pump life would always be in question. Good luck and please let us know if you find something that works. |
Originally Posted by cardo0
(Post 1598058009)
I'm suspicious of the vacuum system drawing in contaminates (like water) through the cap and housing seals.
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Read someone crapped up their Opti with a deluge from the radiator hose. But probably BS as usual.
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Someone did. What's that got to do with the venting systems that we're discussing in this thread?
More BS as usual is right. YOU said: "I'm suspicious of the vacuum system drawing in contaminates (like water)" I replied and said that on the vented system, all the air used for the venting is filtered air. Meaning; how ya gonna get water and contaminates in there? So now....what are ya doin' Cardo? You're arguing just to argue again. Just like you always do. The type of system you choose for venting's got nothing to do with dumping water on the opti from a blown hose. IDK why you brought that up, other than to argue again. The factory system uses filtered air specifically so it doesn't get contaminates into it. IOW, "engineering" your own fish pump system is pointless for the reasons you listed (contamination) and won't accomplish anything that the factory system doesn't already accomplish. |
It takes you 4 paragraphs to tell us your butt hurts. And we can read you don't understand how a positive pressure system can work.
Have you found pyschological help yet? |
Originally Posted by cardo0
(Post 1598086387)
It takes you 4 paragraphs to tell us your butt hurts. And we can read you don't understand how a positive pressure system can work.
Have you found pyschological help yet? |
A vented opti with vacuum drawing in fresh air is never under significant negative pressure inside the cap. The point is to move fresh air through the system, not to pull a vacuum (i.e. pressure differential) on it. The opti internals are wide open to the atmosphere via the fresh-air supply tube that connects to the intake snorkel. Therefore, the vacuum moves air through the system but never puts significant pressure differential on the system. It won't "draw in moisture" through the cap and seals. By the same token, trying to move air through the system with positive pressure via the outlet of a fish tank pump is going to move air but not create a pressure differential. The system will be equally (in)vulnerable to water as with the OE vacuum system.
BTW, the reason the vented opti is important isn't because of moisture. It's because it helps prevent ozone buildup in the cap, which otherwise will cause corrosion and poor distributor performance. If your seals are good on the cap, water isn't getting in. If they are bad, water can get in regardless of venting or not. |
Ha, ha, ha. Vacuum moves air but doesn't never puts significant differential pressure on the system? More imagination engineering again. My car pulls nearly 18"Hg vacuum which is close to 9psi. The dynamic force of air moving at 100mph is only about 0.5psi. You are just full crap again. I wouldn't bother to even respond other than to warn others.
As usual I get 2 trolls on one thread. I think they're linked together - some type of bonding. :- |
Originally Posted by cardo0
(Post 1598107256)
Ha, ha, ha. Vacuum moves air but doesn't never puts significant differential pressure on the system? More imagination engineering again. My car pulls nearly 18"Hg vacuum which is close to 9psi.
It's the same story for the opti: it has a fresh-air opening that's the same size as the suction port. Ergo, there's nearly no restriction against which the vacuum port can exert any force (negative pressure, aka vacuum). So it moves air instead, which is the whole point of the vent system on the later optis. This isn't exactly rocket science here, cardo. But if you don't believe me, prove me wrong:
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Ha, ha, I don't drive at WOT. At normal road speeds I have at least 12" of vacuum. And I know this because I have a manifold vacuum gauge mounted on my dash. And I recall it's tee'd into the same port the opti uses as my opti is a conversion from early non-vacuum vent to late vacuum vented opti as I run a late model opti and timing cover on my early model opti car.
So you want measure vacuum on the fresh air side side? How stupid! Of course it will near atmospheric or it should unless the intake duct has restriction. You don't even know how your intake works in front of and behind the throttle blades! Your ignorance is proven here. Yet I'm sure you will continue to run your mouth until it becomes another topic like formula engines. Shut up and go away! |
Originally Posted by cardo0
(Post 1598112577)
Ha, ha, I don't drive at WOT. At normal road speeds I have at least 12" of vacuum. And I know this because I have a manifold vacuum gauge mounted on my dash.
So you want measure vacuum on the fresh air side side? How stupid! Of course it will near atmospheric or it should unless the intake duct has restriction. You don't even know how your intake works in front of and behind the throttle blades! Your ignorance is proven here. Yet I'm sure you will continue to run your mouth until it becomes another topic like formula engines. |
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