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Timing Mech vs Vac advance Good Read

Questions, answers, tips and tech on drivetrain issues.

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78 Elky
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Post by 78 Elky » Tue Oct 07, 2003 10:38 pm

Actually I was able to pull more vacuum than you would think. I got about 12 inches at idle. And just out of curiosity, is there a problem with unilites, or is it a preference issue?
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Supe
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Post by Supe » Tue Oct 07, 2003 10:43 pm

Lots of horror stories about the pickup and the module burning out due to being very sensitive to voltage.
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Little Red Wagon

Post by Little Red Wagon » Wed Oct 08, 2003 7:27 am

All I will say on this is go to the race track and look at the dist in all the cars and see what they are running. There is a reason why they run them and not the others. :)

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liquidh8
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Post by liquidh8 » Thu Oct 16, 2003 7:34 pm

Set your initail timing with the vacuum advance unhooked. I answer this question about timing and vacuum advance on a different topic on like page 3 or something. He just did it in more detail.

Well said
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Got Torque
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Post by Got Torque » Wed Oct 29, 2003 3:11 pm

Thank's to Fred, I now know enough to ditch my "Harry High-school" carburator setups that I used until now.

Thank's again Fred for explaining the vacuum advance bit the understandble way!

I think this knowledge will come in handy when it's time to beef up the caddy engine i hope to be the proud owner of this weekend.
Mike
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Little Red Wagon

Post by Little Red Wagon » Wed Oct 29, 2003 6:27 pm

Glad it helped you :D if your caddy engine happens post for caddyguy on this board or check out Terrys caddy powered Bu Wagon and Ford PU also caddy powered at petersonracing.com great guys :!: They have a nice site and message board to boot tell them I said hello. :lol:

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Post by Got Torque » Sat Nov 01, 2003 9:56 am

Will do!

Thank's for the links.

I'll let everyone interested know if i buy the engine or not.
Mike
The garage:
Malibu 2dr -79 with the body off the frame for some reason..awaiting attention. Goal to be rolling in 2009.
Yamaha TT600R "Hammer" SuperMotard bike total project...finish date Sept. 2008.
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Vacuum cans

Post by HellCamino » Sat Dec 13, 2003 7:06 pm

:shock: yup that was a bit of a read :shock:
Look'in like a fish.

OK, so you say the vacuum advance is best for a street car.
I would agree,if I could find a can that would work with lots of initial advance and a good curve.

I run a MSD distributor with one medium spring and one heavy spring,full advance at 3000(I think), 18 degrees mechanical advance,and 14 initial,this makes 32 total.Currently without vacuum advance.

I run pump premuim gas.

I have used a stock 18 degree can, a stock 15 degree can,a stock 10 degree can from a Vette, and a Accel adjustable can.None of them have worked without making the engine ping.
The guy who owns and operates the local performance shop in town is the one that suggested the Vette can.He said that it came in at a low Hg point.
Should I try the Echlin#VC-1810 -15 degree can mentioned in the first post?

Whenever I tried to use a advance can I had to retard the initial timing
wich hurt the 60's.I finally used the adjustable Accel can but I had to have the screw so far in that it really had no effect since it only adjusts the total amount of advance added and not the Hg starting point or rate..
If I had known that I would not have bought it.

Is there a master listing of vacuum cans that shows the Hg starting point and their advance rate with Hg loads?

My 79 EL runs a SB350.The combo is 10.2:1,CamDynamics HYD cam 278 221 467 110,Performer RPM,Holley 650DP,S/R Torkers 202/160 Mildly Pocket Ported,1 3/4 inch headers,2 1/2 inch exhaust,MSD distributor,6-A box,Blaster 3 coil,TH-350,Trans-GO Stage II shift kit,TCI 11inch 2400 stall,3.42 possi,26tall tires.

I think this combo might just have too much compression to be able to use more advance at light throttle acceleration during passing, hills and such.
Last edited by HellCamino on Sat Dec 13, 2003 7:48 pm, edited 1 time in total.

Little Red Wagon

Post by Little Red Wagon » Sat Dec 13, 2003 7:36 pm

It sounds like you have tied several combos to date I had some of the same problems a few yrs ago. After trying all the options I personally went to a locked dist MSD setup. I just changed to EFI last winter and was able to go to ECU control. Post this question on main Fourm Drivetrain Tech for some of our sharper tuners :D shouls be able to answer your questions. Glad to have you on board someone will be able to help you.

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Post by Canadian-T-Bone » Sat Jan 10, 2004 9:58 pm

All I know is that the more I read ,the more I need to do to my Malibu !
Soooo much time so little $
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lilwillie78camino

Post by lilwillie78camino » Mon Jan 19, 2004 9:13 pm

Thanks for the post fred!! :D I think that helped me out!

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Post by Mezmorized » Wed Mar 24, 2004 11:42 am

That's going to take me a while to read... LOL I have the attention span of a gerbil!! :shock: :shock: :shock:

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wadedog
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Post by wadedog » Sun Apr 11, 2004 12:02 am

thanks fred, that was a good read.
i wonder what conditions then should a guy run the echlin can, how do you know if you need it?
How about some info from you guys that have swapped springs and weights in your street cars with HEI.
what site did that come from fred, sounds like you know some good sites.
how about some site names buddy,lol.

Little Red Wagon

Post by Little Red Wagon » Sun Apr 11, 2004 8:58 am

Wade I can't remember where I found that at it was on one of the racing boards that it came from. I've slept sense then, wish I knew who the author was I would give them credit for it.

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WEBBER
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Vacum advance ported or manifold

Post by WEBBER » Sun Apr 25, 2004 4:38 pm

I've been arguing with people for years,on this topic. What a great article.
THANKS!!!!!
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