Yes, vacs have both, no, your function is backwrads

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Posted by Chris Case [172.68.46.32] on Thursday, November 01, 2018 at 09:45:49 :

In Reply to: Maybe this archived post answers it posted by DDD [162.158.255.121] on Thursday, November 01, 2018 at 09:16:22 :

A vac unit has the most vacuum at full vacuum, which is less throttle. It adds horsepower for FREE! at low to mid throttle. But if you hit a hill at that much advance it would ping/detonate too early, pushing pistons down while they were still traveling upwards. Loss of power ensues, plus sucked valves, blown headgaskets, holes in pistons, broken rings- all around very bad for engines to ping.

For the last 50 years, the only engines withou vac on them were industrial one-speed-at-one-load, or full throttle uses, like boats which never coast downhill, or racers.

I run vac adv on all my old iron. Thye just run better.

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Follow Ups:

Re: fiegot the rest of my thought - DDD 09:57:30 11/01/2018

ok thanks Chris... your saying then.... - DDD 09:53:43 11/01/2018

ok. but wait a second, Jim - DDD 15:43:28 11/01/2018
- Re: ok. but wait a second, Jim - Daryl in Oz 18:42:07 11/01/2018
No. - Jim Lee 13:48:45 11/01/2018
- oh wait.. I DID read this all wrong - DDD 15:54:31 11/01/2018

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