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Full Moon Bus Club :: Forums :: Tech Talk :: Tech Questions
 
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82 Auto cruising RPM
Moderators: TN Jed, Lickity Split, docric, sweetbus, Tom and Phaedra, Collie
Author Post
Popsbus
Sat Sep 18 2010, 08:51PM

Registered Member #35
Joined: Wed Aug 11 2010, 03:21AM
Location: Louisa, VA
Posts: 160

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Just hooked up a tach to my 82 Westy with stock fuel injection and automatic transmission. Ran some errands tonight and was watching the RPM's 65 4200 give or take. How high can an aircooled go safely. I know there may be varying opinions on this range but looking for basic guidance.

Thanks,

Rory
87 westy
Louisa, VA
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Fred
Sat Sep 18 2010, 10:48PM

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Joined: Wed Aug 11 2010, 10:50AM
Location: Virginia Beach
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If im reading my book right, third gear in automatic is 1.00

fourth gear in a manual is .85, so the auto is working at higher revs.


is your speedometer accurate ?

What size tires are you using?

Had too many vans to count
The best Bus tech site : www.ratwell.com
https://www.facebook.com/gearhead.vonfredericksen


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Popsbus
Sun Sep 19 2010, 07:47AM

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Pete, thanks for the reply. 195 75 14, squishy junk ones. Working on replacing them as cash flow permits. We were camped next to you at natural bus.

Was using a GPS for speed.

Have been told red line is 5400 for a 2.0 and if that's correct is running under 5000 acceptable? Meaning 4500-4999K ?

Rory
87 westy
Louisa, VA
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GreenBus
Sun Sep 19 2010, 08:02AM

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I own a 90 auto and my bus runs at 4500 rpm at 70, I beleave thats about the time you leave the green area on the tack and enter the white zone, redline i think is just above 5000 rpm. im running 14 " tires that are 8 ply. you probably already are aware, but anything over 60 mph kills your gas mileage majorly!

www.HippyMotorsUSA.com
1988 Carat Wolfsburg

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busesofthecorn
Sun Sep 19 2010, 08:02AM
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Location: Toronto, ON
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<stepping up on soap box....>

Safety on an aircooled should be judged by CHT and oil temps/pressure, not MPH. The engine stops making power above 4500 anyway but the FI and auto trans should keep you from getting near the redline regardless.

Keep the CHT below 400, keep the oil below 230F and it'll go forever, regardless of rpms or mph.

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Popsbus
Sun Sep 19 2010, 08:21AM

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Location: Louisa, VA
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Thanks, a CHT gauge is on the top of my next list. It is running great and not that hot. I have had other vans years ago that I melted #3 time and time again. Mainly due to being young and an 009 and carb, timing being off. Oh and being young.

This van is all stock and keeping it that way except for the gauges. The tach was free and unexpected.

Rory
87 westy
Louisa, VA
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markdearing
Sun Sep 19 2010, 08:50AM
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Location: salem va
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hey guys the late buses use to come with a rev limiting rotor that would kick out at about 5500 rpms later md

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