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91

Technical Discussion - Performance / Modify / Re: ignition timing after removing vacume line?

« Last post by ebewley on June 11, 2025, 08:24:18 PM »

Howdy Ted! Good to see you on the forum! Yeah, there is no vacuum advance port on the Harley CV carb and where it was hooked to (intake manifold) it would act backwards meaning full vacuum advance at idle (when the throttle plates are closed = high vacuum) and then go away when you apply throttle (open plate less or no vacuum) So, all your getting is mechanical advance from the distributor itself. This can be adjusted modified to get a new advance curve all mechanical by a distributor servicing shop. You can let them know where you want to set initial (probably somewhere around 10 or 12 degrees and then you want final to be somewhere around 32 - ish degrees and then how quickly you want to get there 2000 rpm or 3000 or    This would make the motorcycle carb work better with the automotive engine. Hope that helps and good to hear the front axle housing repair went smoothly!  -Eric

example of this service  https://www.everyday-performance.com/distributors.htm  (not affiliated)

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Technical Discussion - Beginner / Repair / WTB 1.6 16 valve engine in good shape

« Last post by 91 ragtop on June 10, 2025, 09:19:04 AM »

Does anybody have a good 16 valve Tracker or Sidekick engine in the northwest part of the country ? Somewhere close to Montana would be great.

Ken..............

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Technical Discussion - Beginner / Repair / Re: Swap 96 body to 91 frame ?

« Last post by fordem on June 09, 2025, 06:23:16 PM »

Be aware that both body & frame bear the VIN, there may be legal ramifications to a body/frame swap - in my corner of the world, this cannot be legally done.

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Technical Discussion - Beginner / Repair / Swap 96 body to 91 frame ?

« Last post by 91 ragtop on June 09, 2025, 02:48:27 PM »

I've got a  91 2 Dr  convertible Sidekick that's real rusty and dented that I would like to put a 96 Tracker body onto. The Tracker has minimal rust and is real straight  with 100,000 less miles on it. It also has the removable hardtop option. If I can find a 16 valve engine I will just fix the 96. I'm guessing that the body mounts are the same but going from a 8 valve throttle body engine to a fuel injected 16 valve chassis is going to cause some wiring problem especially with the different dashes. Does anyone have any advice on this project ?

Ken.                 

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Technical Discussion - Performance / Modify / Re: ignition timing after removing vacume line?

« Last post by the blackdog on May 29, 2025, 09:26:59 AM »

"What does it help with?"
  It seems to give better throttle responce at mid range.
 On my test hill (paved but steep and long) it can carry 2ND gear all the way up. That has been a way for me to tell if new equipment is "snake oil" or actually produces more torque. 
 Eric said that the manifold hook up for the vac hose didn't work well but there is no place on the Harley CV carb to attach to. Everything is still there so I can attach back to the manifold as a test.
 I do run premium. Have not done MPG yet, that is almost as important as power to me. If I carry more gas to extend range It's more weight, thus giving away some of the Samurai's superpower.
 The mission of the sammi is to get me from my driveway to explore places that I wouldn't take my AWD Astro van, so even if I use the vac adv sometimes and disconect it for other tasks (freeway/crawling) that's ok.
 Just where to set the base timing for each if anybody has done things this way.

This is my first Suzuki but back in the 1980's I had VWs (bug, van and ghia) and the mech only lightning whirlers always worked best. 
 
   

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Technical Discussion - Performance / Modify / Re: ignition timing after removing vacume line?

« Last post by fordem on May 29, 2025, 08:16:25 AM »

Now I'm curious - can you say what disconnecting the vacuum advance was supposed to help with?

Vacuum advance is primarily an engine efficiency function, advancing the ignition timing to allow for "more complete" combustion is lean mixture, part throttle scenarios such as highway cruise.  You can disable it and run more base timing, how much more base timing will depend on what octane fuel you're willing to run, and yes, pre-ignition or pinking/pinging will be the result of over advancing the timing.

I had the vacuum can fail on a carbed Swift (same G13 as the Samurai but a different carb) and rather than replace the can, we locked out the vacuum advance and bumped up the base timing, back then we only had one octane available, premium, so the common practice was to bump the timing to make the best of what we had to pay for - it was too long ago (and too many vehicles) for me to remember clearly, but I remember running as much as 18 degrees of base timing, just not what vehicle it was

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Technical Discussion - Performance / Modify / Re: ignition timing after removing vacume line?

« Last post by the blackdog on May 28, 2025, 01:36:54 PM »

OK that was a little vague

1987 Suzuki Samurai manual transmission. no ac or power steering.
Modifications that may or may not affect timing:
EGR has been removed and blanked off, likewise the PCV.
The stock carburetor is long gone, it had a Weber when I bought it and has been converted to a Harley CV.

The distributor advance was attached to the manifold to get it's vacuum input.

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Technical Discussion - Performance / Modify / Re: ignition timing after removing vacume line?

« Last post by fordem on May 28, 2025, 12:48:16 PM »

Do we have to guess what you're adjusting the timing on?  Is there a prize if I guess correctly?

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Technical Discussion - Performance / Modify / ignition timing after removing vacume line?

« Last post by the blackdog on May 28, 2025, 09:01:17 AM »

At the Cline Butte meet it was suggested that the distributor vac line to the manifold wasn't helping. So I removed it and capped it off.
It starts easy and drives great, but now where to set timing at idle (800 rpm)?
I'm at 12dgs btdc now but my greedy nature is pushing me to "give it a little more and see what happens"
How to tell when it's too much? pinging? overheating?   

The meet was fun and the diff damage was welded up and is working fine.

Ted
aka The Blackdog

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ZUKIWORLD 'ZUKFARI / Re: Cline Butte - Memorial Day Weekend, 2025

« Last post by the blackdog on May 22, 2025, 07:16:33 PM »

Everything still on for Cline Butte Friday-Saturday-Sunday?
I plan to be at the staging area by 300pm.  If nobody is at the orv site I'll look for "the pit"

The Blackdog