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passe
Samba Member
Joined: January 21, 2013
Posts: 26
Location: Sverige
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 Posted: Tue Sep 22, 2015 9:54 pm Post subject: Runs bad when cruising!!! |
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| My 1641 with c25 cam mildly ported heads.Bosch 019 dizzy. Ict 34's with jets 55/140. It idles fine, pulls fine and strong under acceleration!! But runs bad when cruising mid throttle!!! |
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cbeck
Samba Member
Joined: January 14, 2014
Posts: 2495
Location: high ridge, mo
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| Posted: Wed Sep 23, 2015 5:29 am Post subject: |
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| Like a big cam lope? carbs out of synch. |
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passe
Samba Member
Joined: January 21, 2013
Posts: 26
Location: Sverige
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| Posted: Wed Sep 23, 2015 8:52 am Post subject: |
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| I have tried to sync with a snail guage! But I shall try once more!!! |
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VWBUGGAH
Samba Member
Joined: February 28, 2012
Posts: 53
Location: HAWAII
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| Posted: Mon Nov 30, 2015 11:03 am Post subject: Re: Runs bad when cruising!!! |
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| My motor would miss at certain rpm and while cruising too...I changed plugs and that solved it...sometimes simplest things work lol...Try changing plugs if you haven't already. |
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scottvw
Samba Member
Joined: November 17, 2004
Posts: 2821
Location: Centennial, CO
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| Posted: Mon Nov 30, 2015 11:39 am Post subject: Re: Runs bad when cruising!!! |
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| Check your idle jets. When you're cruising you are typically on the idle circuit. A small amount of trash can make a big difference. |
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nextgen
Samba Member
Joined: August 19, 2004
Posts: 6032
Location: CONGERS, N.Y.
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JasonBaker
Samba Member
Joined: February 08, 2010
Posts: 1642
Location: Cleveland, TN
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| Posted: Mon Nov 30, 2015 12:17 pm Post subject: Re: Runs bad when cruising!!! |
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| Have someone push the gas pedal to the floor. Are the butterfly's in BOTH carbs fully open? |
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[email protected]
Samba Member
Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
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| Posted: Mon Nov 30, 2015 12:59 pm Post subject: Re: Runs bad when cruising!!! |
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sounds like the LINKAGE isn't synced. Just because it's synced at idle, doesn't mean it is at part throttle. You must check this.
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nextgen
Samba Member
Joined: August 19, 2004
Posts: 6032
Location: CONGERS, N.Y.
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| Posted: Mon Nov 30, 2015 2:09 pm Post subject: Re: Runs bad when cruising!!! |
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John I think check the cable is Fix car lesson #1. I myself forget it.
Loose linkage or cable can cost a few hp and drive you nuts trying to figure it out.
I went crazy because my carbs were racing like crazy whenever I stopped. Timed the car, adjusted the mixture, adjusted the valves, used the snail synchronizer , got the best idle I ever had. Got in the car ran great to the next stop light, same problem. This time I did not shut the engine off and when I opened the hood it idled perfect !!!!!!!!! I had a rain deflector that caught the rain that came from the hood louvers, it got loose and was lightly hitting my linkage. I ripped it out an threw it as far is I could!
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rgdedge
Samba Member
Joined: October 17, 2006
Posts: 862
Location: Seymour, TN
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| Posted: Tue Dec 01, 2015 8:02 pm Post subject: Re: Runs bad when cruising!!! |
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My 36mm delloratos started cutting out at cruising speed a few years back. I tried cleaning them, checked the linkage, plugs, points. It ended up being lean at cruising speed due to the ethonal in the gas. went up a size on the idle jets and its running great like it always has for the last 25+ years.
Tim
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