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Mountainmotors
Samba Member
Joined: December 05, 2005
Posts: 68
Location: Glen Allen Virginia
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 Posted: Mon Sep 27, 2021 2:35 pm Post subject: Higher rpm low speed |
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| 1972 bug just started running 3000 rpm but can't get over 50 mph. Engine is 1776 with dual ict. 009 distributor. New plugs. New plug wires. Starts fine. Idle very rough. Feels like no advance. Plugs look fine. Use to run 70mph at less than 3000rpm |
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Starbucket
Samba Member
Joined: April 30, 2007
Posts: 4026
Location: WA
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| Posted: Mon Sep 27, 2021 3:14 pm Post subject: Re: Higher rpm low speed |
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| Sounds like a slipping clutch. If you remove dist. cap grab the rotor and give it a twist, does it spring back? You are required to add a couple of drops of oil when ever the felt pad (under rotor, center of shaft) looks dry or the advance mech. will lock up. |
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Pruneman99
Samba Member
Joined: February 22, 2012
Posts: 5013
Location: Oceanside
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| Posted: Mon Sep 27, 2021 3:40 pm Post subject: Re: Higher rpm low speed |
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| No matter how poorly it runs, a set RPM in a set gear will always produce the same speed unless the clutch is slipping. |
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Igpoe
Samba Member
Joined: February 24, 2019
Posts: 853
Location: South Boston, VA
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| Posted: Tue Sep 28, 2021 3:57 am Post subject: Re: Higher rpm low speed |
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| Pruneman99 wrote: |
| No matter how poorly it runs, a set RPM in a set gear will always produce the same speed unless the clutch is slipping. |
So, you're advising him to challenge himself by putting it in 4th gear? That's a little bit funny, but at the same time..........
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'73 super. |
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Igpoe
Samba Member
Joined: February 24, 2019
Posts: 853
Location: South Boston, VA
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| Posted: Tue Sep 28, 2021 4:04 am Post subject: Re: Higher rpm low speed |
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I suggest carbs are not synchronized with each other and/or full throttle cannot be reached because of linkage issues.
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'73 super. |
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kangaboy
Samba Member
Joined: August 28, 2010
Posts: 1063
Location: St. Louis, Mo
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| Posted: Tue Sep 28, 2021 8:59 am Post subject: Re: Higher rpm low speed |
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| Igpoe wrote: |
| Pruneman99 wrote: |
| No matter how poorly it runs, a set RPM in a set gear will always produce the same speed unless the clutch is slipping. |
So, you're advising him to challenge himself by putting it in 4th gear? That's a little bit funny, but at the same time.......... |
What's funny about that? Unless the dude in fact is running in 3rd and didn't shift to 4th gear...in which case there is a greater concern for ones mental health.
But like Pruneman said...no mater how crappy your motor is running...a motor that rotates at 3000rpm at 70mph in a certain gear, will continue to run rotate at 3000rpm at 70mph in that same gear, unless the clutch is slipping.
EDITED: Spelling
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-74 Standard - "CaliBug" 2084T, MS3X w/FI and Crank Fire
-76 Westy - "Gandalf"
-18 GTI SE
| skills@eurocarsplus wrote: |
that fucking thing looks like it drove through a J.C. Whitney catalogue and hit everything on the way out  |
Last edited by kangaboy on Tue Sep 28, 2021 12:35 pm; edited 1 time in total |
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Lingwendil
Samba Member
Joined: February 25, 2009
Posts: 3988
Location: Antioch, California, a block from the hood
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iowegian 
Samba Curmudgeon
Joined: February 16, 2005
Posts: 9829
Location: Somewhere between Dubuque and Keokuk
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| Posted: Tue Sep 28, 2021 6:26 pm Post subject: Re: Higher rpm low speed |
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| Pruneman99 wrote: |
| No matter how poorly it runs, a set RPM in a set gear will always produce the same speed unless the clutch is slipping. |
What if he's in Antarctica or someplace like that and his wheels are spinning on the ice----then wut?  |
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Starbucket
Samba Member
Joined: April 30, 2007
Posts: 4026
Location: WA
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| Posted: Tue Sep 28, 2021 7:28 pm Post subject: Re: Higher rpm low speed |
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| If you didn't torque your rear axel nut to 220 ft/lbs the splines in the brake drum have stripped and soon you won't be able to go forward or backward at any RPM. |
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pernest
Samba Member
Joined: May 24, 2008
Posts: 272
Location: Jacksonville FL
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| Posted: Tue Sep 28, 2021 7:40 pm Post subject: Re: Higher rpm low speed |
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Years ago when it snowed in Pensacola and our street was frozen, I put my old Volvo in 4th while doing about 15 mph and floored it — had to buy another Speedo.
Prumeman is spot on — old timers used to say the best way to test for slipping clutch was to put the car in high and floor it at slow speed. |
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pernest
Samba Member
Joined: May 24, 2008
Posts: 272
Location: Jacksonville FL
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| Posted: Tue Sep 28, 2021 7:46 pm Post subject: Re: Higher rpm low speed |
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| Sorry Pruneman99 about misspelling your name above. |
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Mountainmotors
Samba Member
Joined: December 05, 2005
Posts: 68
Location: Glen Allen Virginia
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| Posted: Wed Sep 29, 2021 7:11 am Post subject: Re: Higher rpm low speed |
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And the fix was.... .
Tach was dying(vdo). Found similar issue on a rod web site. Guy with 32 ford had same issue. Tach failing pulls down ignition system
I removed tach wire from coil and smooth idle finally able to adjust mixture. Runs with full power. Thanks for all the quick ideas on what to look for. Yes it is petronix ignitor points replacement |
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Cusser
Samba Member
Joined: October 02, 2006
Posts: 31379
Location: Hot Arizona
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| Posted: Wed Sep 29, 2021 8:10 am Post subject: Re: Higher rpm low speed |
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| Mountainmotors wrote: |
And the fix was.... .
Tach was dying(vdo). Yes it is petronix ignitor points replacement |
Wow ! Glad it's working.
_________________
1970 VW (owned since 1972) and 1971 VW Convertible (owned since 1976), second owner of each. The '71 now has the 1835 engine, swapped from the '70. Second owner of each. 1988 Mazda B2200 truck, 1998 Frontier, 2014 Yukon, 2004 Frontier King Cab. All manual transmission except for the Yukon. http://www.thesamba.com/vw/forum/album_page.php?pic_id=335294 http://www.thesamba.com/vw/forum/album_page.php?pic_id=335297 |
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johnnyvw164
Samba Member
Joined: July 27, 2020
Posts: 573
Location: South of Raleigh
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| Posted: Wed Sep 29, 2021 8:49 am Post subject: Re: Higher rpm low speed |
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| Interesting....good that you posted this, may save someone else from pulling their hair out! |
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Floating VW
Samba Member
Joined: April 28, 2015
Posts: 1597
Location: The South Zone
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| Posted: Wed Sep 29, 2021 5:03 pm Post subject: Re: Higher rpm low speed |
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3000 RPM at 70 MPH? Yeah, failing tach would've been my first guess. Unless, of course, you're running a mega freeway flyer gearbox with some super tall baja tires!
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"It's time you started treating people as individuals, rather than mathematically predictable members of an aggregate set, regardless of how well that works." |
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