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Author Topic:   Vacuum advance
Blind Barney
Dirt Maniac

Total posts: 120
posted April 13, 2005 12:27 PM  
Is running an engine without vacuum advance a problem or an improvement?

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 13, 2005 12:35 PM  
Hands down improvement.

You can even take it one step furthur and lock up mechanical advance as well.

racer17j
Dirt Forum Champ
Total posts: 5390
posted April 13, 2005 06:13 PM  
What I have now is just the hose laying there and not hooked up. Is this ok or no? If you leave the hose unhooked do you HAVE to weld?

TEAMPCR
Dirt Freak

Total posts: 238
posted April 20, 2005 11:27 AM  
With the hose just laying there, you have a vacuum leak. Plug it. The weights should still be removed and the MECHANICAL advance welded. The Vacuum advance and Mechanical advance are two seperate parts and both should be addressed. By locking both out, you will have steady timing throughout the rpm range.

racer17j
Dirt Forum Champ
Total posts: 5390
posted April 20, 2005 04:28 PM  
Anyone run the vacuum advance welded but use the mechanical advance so it won't be so "spunky" off the turns???

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 26, 2005 11:52 AM  
'spunky' ???

Most of the time you are above the full advance speed of the mechanical advance so it doesnt matter. Weld everythign up solid so you dont have to worry about it falling apart.

crc1124
Dirt Maniac

Total posts: 143
posted May 01, 2005 12:48 AM  
I agree with welding it up. I found out the hard way! Springs came loose last year and it miss fired and caused detonation. Fire slotted my head between #3 & #5. I had the machine shop weld it and it seems to be running fine but everyone I talked to said I was very lucky that was all that happened!

Mikey14
Dirt Freak

Total posts: 265
posted May 09, 2005 02:19 PM  
does it matter where you weld the mechanical advanced? meaniing open or closed? I would think that welding it solid is all that maters but just checking.

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