engine RPM

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engine RPM

Postby robwalk45 » Sat Jan 18, 2014 11:09 am

I put a tach in the bug yesterday I was curious as to how many revs the engine turns at highway speeds. If my speedometer is close, it turns 3000 rpms @60mph and 3500 @ 70mph. Since this is my first bug, I was surprised that they rev this high at moderate highway speeds.
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Re: engine RPM

Postby vdubjim » Sat Jan 18, 2014 9:04 pm

only designed to go 55mph on the highway................

whats the bently say? lol.
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Re: engine RPM

Postby derbug » Sun Jan 19, 2014 1:36 pm

Assuming you have stock 1300 engine....Really do not remember what you have for
an engine....anyway the stock 1300 makes 50HP at 4,600 rpms
Also assuming you have the stock 66 tranx you should have a 4.125:1 ring and pinion
with a .89 fourth gear making your final drive ratio a 3.67125 in fourth gear.
Also assuming your rear tires are very close to stock diameter a little more or less than 25
inches.....FYI a 165 SR 15 tire diameter: 25.43 (per Coker tire specs) your car should of
been equipped with 5.60x15 which I think is a little less than 25" or have found to be 24.8"
but not quite sure of the latter(24.8")...but should be close.

The advertised top speed and top cruising speed on your car per 66 VW Owners Manual
was 74 MPH.
At 70 MPH your tac is reading 3,500 and if your tac is accurate....you are not
really not hurting your engine with excessive rpms.....1.100 rmps left over to peak out engine
if it is a stock 1300
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Re: engine RPM

Postby robwalk45 » Mon Jan 20, 2014 8:14 am

My car has a dual port 1600 (I think, it was in the car when I purchased it) it has 165R15 tires on it, they look really good tread wise, however I checked the code on them and they are 13 years old, going to put new ones on. I think the transaxle is original to the car,it's greasy enough and when I had the engine out I could see where someone had ground the bell housing for the larger flywheel. It seems to sing along happily at 60 MPH, which is fast enough for me. Don't know how accurate the tach is. It is a small cheap one. Had a heck of a time figuring out where to mount it, not much room in a bug. I ended up mounting it on the steering column.
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Re: engine RPM

Postby robwalk45 » Mon Jan 20, 2014 8:23 am

All most missed Jim's comment about the Bentley manual! I guess he thinks I read it to much. :lol: . I have always liked to read and learn about mechanical stuff. I don't want to seem like a complete idiot! Yes I have that manual too.
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Re: engine RPM

Postby vdubjim » Mon Jan 20, 2014 9:45 am

Run whatever speed you like, as long as the motors decent you'll be fine.
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Re: engine RPM

Postby derbug » Mon Jan 20, 2014 8:03 pm

FYI for some rpm vs speed reference:
I have a Kia Spectra, 5 speed manual trans.....
1800 CC 4 cylinder
Cruising in 5th gear
Today on my way to El Reno, I noted at 70 MPH
my rpm was 3300
at 3500 I was going about 73-74
Your 66 is only going 200 more rpms at 70
than my Kia:
I will let you decide from here....
hope this will give you some prospective
info that you can use.
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Re: engine RPM

Postby robwalk45 » Wed Jan 22, 2014 8:35 am

I guess I am used to my Camry, 2.5l 4cyl, 60= 1500/1600 rpm 70= 2000 rpm. That's probably why it gets good gas mileage.
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Re: engine RPM

Postby vdubjim » Wed Jan 22, 2014 8:56 am

Get a stinger, then you wont hear the rpm
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Re: engine RPM

Postby Bobs68VW » Mon Jan 27, 2014 7:44 pm

On the "high" end of the spectrum, my Bonneville Bug with a .82 4th gear, 3.875 Ring and Pinion, and 28 inch tires will be turning 2673 RPM at 70 MPH... ;)

Get a stinger, then you wont hear the rpm


The exhaust from the turbo is about a foot long...A three inch pipe directed directly aft. :o ;) :o
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