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Car fails to acheave high speed A friend of mine recently complained that his new car (to him) was not able to go faster than 40 mph and was unable to climb grades very fast and barely made it to the top of steep grades. He changed everything: points, condensers, coil, sparkplugs. He checked the timing, compression (60-60-60-60). In the end, for lack of any other idea's I suggested he check the accelerator throw. He found that it was not allowing the throttle to open fully.
I guess this shows that we don't look outside of the box sometimes. We assumed it had to be timing or electrical. He even considered sending the engine out for overhaul to solve the problem. Food for thought Bill G |
Re: Car fails to acheave high speed On new to me car, one the first things I check (among others) is the throttle throw. Found a number of car that the throttle did not open fully.
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Re: Car fails to acheave high speed Good catch. That is something easily overlooked.
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Re: Car fails to acheave high speed I am right in the middle of that issue right now only my problem is at the other end of the scale. Car idles way to fast as the throttle will not shut all the way. Yes, the idle screw is backed off. Trying to think this through, if I bend the throttle control arm that is near the firewall so that the throttle will close it has an effect on fully opening the throttle. Does not seem to be a solution. Be very interested to hear some opinions. Bill
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Re: Car fails to acheave high speed While it is idling, see if you can close the throttle with your finger pushing it a bit. If you can, simply add a redundant throttle return spring to the lever. We all should have a redundant spring anyway. Here is a link to one version. https://www.youtube.com/playlist?lis...rIa0r_fFQcz4R0
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Re: Car fails to acheave high speed During my time staying at home due to Covid and looking for something to do, one of the things I have done is I rebuilt and installed a Marvel Schebler carburetor on my Town Sedan. And I ended up having throttle linkage issues as things were positioned a "little different" than the Zenith.
First thing I noticed is my hand throttle rod ends were worn out. Then I noticed the new repro hand throttle rod was ¼" shorter than the one that was on my car. (Surprise, surprise!!). Vendor catalog says 6" but it measures 5¾". Anyway after fiddling around with it for awhile I finally decided to just make the hand throttle rod adjustable. Maybe the OP could use something like this to get his throttle operating properly instead of bending things.. https://live.staticflickr.com/65535/...4307c8de_w.jpg |
Re: Car fails to acheave high speed I will have to look into this accelerator throw thing. I've had this exact problem since the day I bought the car. Changed everything. I can get the 40 on a downgrade . . . sometimes.
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Re: Car fails to acheave high speed Dann, There is a hard stop---no screw adjustment--- on the throttle against the carb. The accelerator rod should allow the throttle to touch the stop. Check that the hand throttle does too. Bill G
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Re: Car fails to acheave high speed If the toe in is toed in too far it will cause wear on the front tires and reduce speed and power . I've had it happen . After the toe in was adjusted to 1/16 a person could feel the improvement .
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Re: Car fails to acheave high speed Y-Blockhead...That's a neat new toy you have invented...I'll bet you could sell those things here on the site...or to a couple of the major suppliers...Ernie in Arizona
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