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Author Topic:   pulling vacume
racerdave99
Member
posted October 13, 2003 04:08 PM
is there anything i can do just by tuning the car to get more vacume. like, timing or degreeing the cam or something like that. i have already messed with the idle mixture, any advise is appreciated


wrenchturner10
Member
posted October 13, 2003 07:20 PM
you could run an msd timing controller and advance the timing way up only when you're going through tech.....


tilley88
Member
posted October 14, 2003 09:58 AM
evil racer...........lol. Back your valve lash off as far as you dare, adjust your air/fuel mixture using a vacuum gauge. Be very careful with the timing deal, I've blown motors going too far. Buy a cam designed by an engine builder or get one recommended by a cam manufacturer, say Comp Cams, etc. Kinda high, but well worth the moolah.


harome1xc
Member
posted October 14, 2003 08:29 PM
Dumb question but, can any of you guys explain what detonation sounds like? Ive read about it and stuff and been around plenty of motors but I dont think ive ever herd a ping or maybe i did but didnt know what it was. Is it pretty loud? Would you hear it in the car?


tilley88
Member
posted October 15, 2003 02:50 AM
Yeah, you can hear it if the headers are'nt too loud. Sounds like DEATH! Just kiddin. Kinda sounds like a sewing machine with a high speed hammerin. Once you've heard it, you'll never forget it. If you let it go, your motor will, too!


rico 08
Member
posted October 15, 2003 05:12 PM
Why not just hook the vacuum advance up?That way you won't have too much timing when your in the gas,works for me.


redneck bubbas racing
Member
posted October 23, 2003 08:50 PM
Rico, That works EXCELLANT to pass tech. There is a problem though. Going down the straight, fool throttle, low vaccum, 36 degrees timing, ok? Up comes the corner, let out of the gas, vaccum shoots up, so does timing, now at 48-50! Thats a little too much for me.


rico 08
Member
posted October 23, 2003 09:56 PM
But.. your off the gas right?no problem.


nate 11
Member
posted October 23, 2003 10:01 PM
humm.......... good answer rico o8.....lol


wrenchturner10
Member
posted October 24, 2003 07:11 PM
Just lock the distributor and leave the vacuum advance unhooked. Put all your timing in at idle. Spin the motor before you flip the ignition to fire it up. Works fine with good gas.

Like it or not the vaccuum rule works good for keeping things even and motors in check. You're only going to get so many RPM's and HP and still pull vacuum. You can get custom cam grinds etc to help but so will everyone else and before long people will start hitting the HP ceiling. I like it.

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Superdave
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